PCF85363A
Tiny Real-Time Clock/calendar with 64 byte RAM, alarm
function, battery switch-over time stamp input, and I2C-bus
Rev. 3 — 18 November 2015
Product data sheet
1. General description
The PCF85363A is a CMOS1 Real-Time Clock (RTC) and calendar optimized for low
power consumption and with automatic switching to battery on main power loss. The RTC
can also be configured as a stop-watch (elapsed time counter). Three time log registers
triggered from battery switch-over as well as input driven events. Featuring clock output
and two independent interrupt signals, two alarms, I2C interface and quartz crystal
calibration, 64 byte battery backed-up RAM.
For a selection of NXP Real-Time Clocks, see Table 72 on page 86.
2. Features and benefits
UL Recognized Component (PCF85363ATL)
Provides year, month, day, weekday, hours, minutes, seconds and 100th seconds
based on a 32.768 kHz quartz crystal
Stop-watch mode for elapsed time counting. From 100th seconds to 999999 hours
Two independent alarms
Battery back-up circuit
WatchDog timer
Three timestamp registers
Two independent interrupt generators plus predefined interrupts at every second,
minute, or hour
64 byte battery backed-up RAM
Frequency adjustment via programmable offset register
Clock operating voltage: 0.9 V to 5.5 V
Low current; typical 0.28 A at VDD = 3.0 V and Tamb = 25 C
400 kHz two-line I2C-bus interface (at VDD = 1.8 V to 5.5 V)
Programmable clock output for peripheral devices (32.768 kHz, 16.384 kHz,
8.192 kHz, 4.096 kHz, 2.048 kHz, 1.024 kHz, and 1 Hz)
Configurable oscillator circuit for a wide variety of quartzes: CL = 6 pF, CL = 7 pF, and
CL = 12.5 pF
1.
The definition of the abbreviations and acronyms used in this data sheet can be found in Section 24.
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
3. Applications
Elapsed time counter
Printers and copiers
Digital voice recorders
Mobile equipment
Digital cameras
Network powered devices
Battery backed up systems
Data loggers
White goods
Accurate high duration timer
4. Ordering information
Table 1.
Ordering information
Type number
Package
Name
Description
Version
PCF85363ATL
DFN2626-10
plastic thermal enhanced extremely
thin small outline package; no leads;
10 terminals; body 2.6 2.6 0.5 mm
SOT1197-1
PCF85363ATT
TSSOP8
plastic thin shrink small outline
package; 8 leads; body width 3 mm
SOT505-1
PCF85363ATT1
TSSOP10
plastic thin shrink small outline
package; 10 leads; body width 3 mm
SOT552-1
4.1 Ordering options
Table 2.
Ordering options
Product type number
Orderable part number Sales item
(12NC)
Delivery form
IC
revision
PCF85363ATL/A
PCF85363ATL/AX
935304648115
tape and reel, 7 inch
1
PCF85363ATT/A
PCF85363ATT/AJ
935304751118
tape and reel, 13 inch
1
PCF85363ATT1/A
PCF85363ATT1/AJ
935304752118
tape and reel, 13 inch
1
5. Marking
Table 3.
PCF85363A
Product data sheet
Marking codes
Product type number
Marking code
PCF85363ATL/A
363A
PCF85363ATT/A
363A
PCF85363ATT1/A
363A
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 18 November 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
2 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
6. Block diagram
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(1) Not available on all package types.
Fig 1.
Block diagram of PCF85363A
PCF85363A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 18 November 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
3 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
7. Pinning information
7.1 Pinning
WHUPLQDO
LQGH[DUHD
26&, 9''
26&2 9%$7 ,17$&/.
3&)$7/
&/.
76&/.,17% 6&/
966 6'$
DDD
7UDQVSDUHQWWRSYLHZ
For mechanical details, see Figure 43 on page 78.
Fig 2.
Pin configuration for PCF85363ATL (DFN2626-10)
26&, 26&2 9%$7 9''
3&)$77
966 ,17$&/.
6&/
6'$
DDD
For mechanical details, see Figure 44 on page 79.
Fig 3.
Pin configuration for PCF85363ATT (TSSOP8)
26&, 9''
26&2 9%$7 ,17$&/.
3&)$77
&/.
76&/.,17% 6&/
966 6'$
DDD
For mechanical details, see Figure 45 on page 80.
Fig 4.
PCF85363A
Product data sheet
Pin configuration for PCF85363ATT1 (TSSOP10)
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 18 November 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
4 of 95
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NXP Semiconductors
PCF85363A
Product data sheet
7.2 Pin description
Table 4.
Pin description
Input or input/output pins must always be at a defined level (VSS or VDD) unless otherwise specified.
Symbol
Type
Description
PCF85363ATT
(TSSOP8)
PCF85363ATT1
(TSSOP10)
Primary use
Secondary use
OSCI
1
1
1
input
oscillator input
-
OSCO
2
2
2
output
oscillator output
-
VBAT
3
3
3
supply
battery backup supply
voltage[1]
-
TS (CLK/INTB)
4
-
4
input/
output
can be configured with TSPM[1:0][2]
INTB and CLK output
(push-pull); stop-watch
control
timestamp input
VSS
5[3]
4
5
supply
ground supply voltage
-
SDA
6
5
6
input/
output
serial data line
-
SCL
7
6
7
input
serial clock input
-
CLK
8
-
8
output
CLK (push-pull)
INTA (CLK)
9
7
9
output
can be configured with INTAPM[1:0][4]
interrupt output
(open-drain)
VDD
10
8
10
supply
supply voltage
CLK output (open-drain)
-
Connect to VDD if not used.
[2]
See Table 7 and Table 47.
[3]
The die paddle (exposed pad) is connected to VSS through high ohmic (non-conductive) silicon attach and should be electrically isolated. It is good engineering practice to solder
the exposed pad to an electrically isolated PCB copper pad as shown in Figure 43 “Package outline SOT1197-1 (DFN2626-10), PCF85363ATL” for better heat transfer but it is not
required as the RTC doesn’t consume much power. In no case should traces be run under the package exposed pad.
[4]
See Table 7 and Table 49.
PCF85363A
5 of 95
© NXP Semiconductors N.V. 2015. All rights reserved.
[1]
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Rev. 3 — 18 November 2015
All information provided in this document is subject to legal disclaimers.
PCF85363ATL
(DFN2626-10)
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8. Functional description
The PCF85363A contains 8-bit registers for time information, for timestamp information
and registers for system configuration. Included is an auto-incrementing register address,
an on-chip 32.768 kHz oscillator with integrated capacitors, a frequency divider which
provides the source clock for the Real-Time Clock (RTC) and calender, and an I2C-bus
interface with a maximum data rate of 400 kbit/s.
The built-in address register will increment automatically after each read or write of a data
byte. After register 2Fh, the auto-incrementing will wrap around to address 00h. When the
RAM is accessed, the wrap around will happen after address 7Fh, (see Figure 5).
DGGUHVVUHJLVWHU
DGGUHVVUHJLVWHU
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K
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K
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Address register incrementing
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K
QG5$0E\WH
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K
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&K
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Fig 5.
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Fig 6.
PCF85363A
Product data sheet
Register map
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 18 November 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
6 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
All registers (see Table 5 on page 8, Table 6 on page 10, and Table 7 on page 12) are
designed as addressable 8-bit parallel registers although not all bits are implemented.
Figure 6 gives an overview of the address map.
The 100th seconds, seconds, minutes, hours, days, months, and years as well as the
corresponding alarm registers are all coded in Binary Coded Decimal (BCD) format. When
one of the RTC registers is read, the contents of all time counters are frozen. Therefore,
faulty reading of the clock and calendar during a carry condition is prevented.
8.1 Registers organization overview
8.1.1 Time mode registers
The PCF85363A has two time mode register sets, one for the real-time clock mode and
one for the stopwatch clock mode. The access to these registers can be switched by the
RTCM bit in the Function control register (28h), see Table 7 on page 12 and Table 54 on
page 54.
57&0
UHDOWLPHFORFNPRGH
UHJLVWHUVHW
VWRSZDWFKPRGH
UHJLVWHUVHW
DDD
Fig 7.
PCF85363A
Product data sheet
Time mode register set selection
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 18 November 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
7 of 95
NXP Semiconductors
PCF85363A
Product data sheet
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8.1.1.1 RTC mode time registers overview (RTCM = 0)
Table 5.
RTC mode time registers
Bit positions labeled as - are not implemented. After reset, all registers are set according to Table 62 on page 58.
Address
Register name
Bit
7
Reference
6
5
4
3
2
1
0
RTC time and date registers
00h
100th_seconds
100TH_SECONDS (0 to 99)
Section 8.2
01h
Seconds
OS
SECONDS (0 to 59)
02h
Minutes
EMON
MINUTES (0 to 59)
03h
Hours
-
-
AMPM
HOURS (1 to 12) in 12 hour mode
HOURS (0 to 23) in 24 hour mode
Days
-
-
DAYS (1 to 31)
05h
Weekdays
-
-
-
-
06h
Months
-
-
-
MONTHS (1 to 12)
07h
Years
YEARS (0 to 99)
-
WEEKDAYS (0 to 6)
RTC alarm1
08h
Second_alarm1
-
SEC_ALARM1 (0 to 59)
Section 8.4
09h
Minute_alarm1
-
MIN_ALARM1 (0 to 59)
0Ah
Hour_alarm1
-
-
AMPM
0Bh
Day_alarm1
-
-
DAY_ALARM1 (1 to 31)
0Ch
Month_alarm1
-
-
-
HR_ALARM1 (1 to 12) in 12 hour mode
HR_ALARM1 (0 to 23) in 24 hour mode
MON_ALARM1 (1 to 12)
RTC alarm2
Minute_alarm2
-
MIN_ALARM2 (0 to 59)
Hour_alarm2
-
-
AMPM
HR_ALARM2 (1 to 12) in 12 hour mode
Section 8.4
0Fh
Weekday_alarm
2
-
-
-
-
-
WDAY_ALARM2 (0 to 6)
WDAY_A2E
HR_A2E
MIN_A2E
MON_A1E
DAY_A1E
HR_A1E
RTC alarm enables
10h
Alarm_enables
MIN__A1E
SEC__A1E
Section 8.4
PCF85363A
8 of 95
© NXP Semiconductors N.V. 2015. All rights reserved.
0Dh
0Eh
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Rev. 3 — 18 November 2015
All information provided in this document is subject to legal disclaimers.
04h
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Address
Register name
Bit
NXP Semiconductors
PCF85363A
Product data sheet
Table 5.
RTC mode time registers …continued
Bit positions labeled as - are not implemented. After reset, all registers are set according to Table 62 on page 58.
Reference
7
6
5
4
3
2
1
0
RTC timestamp1 (TSR1)
11h
TSR1_seconds
-
TSR1_SECONDS (0 to 59)
12h
TSR1_minutes
-
TSR1_MINUTES (0 to 59)
13h
TSR1_hours
-
-
14h
TSR1_days
-
-
TSR1_DAYS (1 to 31)
15h
TSR1_months
-
-
-
16h
TSR1_years
TSR1_YEARS (0 to 99)
AMPM
Section 8.7
TSR1_HOURS (1 to 12) in 12 hour mode
TSR1_HOURS (0 to 23) in 24 hour mode
TSR1_MONTHS (1 to 12)
17h
TSR2_seconds
-
TSR2_SECONDS (0 to 59)
18h
TSR2_minutes
-
TSR2_MINUTES (0 to 59)
19h
TSR2_hours
-
-
1Ah
TSR2_days
-
-
TSR2_DAYS (1 to 31)
1Bh
TSR2_months
-
-
-
1Ch
TSR2_years
TSR2_YEARS (0 to 99)
AMPM
Section 8.7
TSR2_HOURS (1 to 12) in 12 hour mode
TSR2_HOURS (0 to 23) in 24 hour mode
TSR2_MONTHS (1 to 12)
RTC timestamp3 (TSR3)
TSR3_seconds
-
TSR3_SECONDS (0 to 59)
1Eh
TSR3_minutes
-
TSR3_MINUTES (0 to 59)
1Fh
TSR3_hours
-
-
20h
TSR3_days
-
-
TSR3_DAYS (1 to 31)
21h
TSR3_months
-
-
-
TSR3_MONTHS (1 to 12)
22h
TSR3_years
TSR3_YEARS (0 to 99)
-
TSR2M[2:0]
AMPM
Section 8.7
TSR3_HOURS (1 to 12) in 12 hour mode
TSR3_HOURS (0 to 23) in 24 hour mode
9 of 95
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RTC timestamp mode control
23h
TSR_mode
TSR3M[1:0]
TSR1M[1:0]
Section 8.7
PCF85363A
1Dh
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Rev. 3 — 18 November 2015
All information provided in this document is subject to legal disclaimers.
RTC timestamp2 (TSR2)
NXP Semiconductors
PCF85363A
Product data sheet
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8.1.1.2 Stop-watch mode time registers (RTCM = 1)
Table 6.
Stop-watch mode time registers
Bit positions labeled as - are not implemented. After reset, all registers are set according to Table 62 on page 58.
Address
Register name
Bit
7
Reference
6
5
4
3
2
1
0
Stop-watch time registers
100th_seconds
100TH_SECONDS (0 to 99)
Seconds
OS
SECONDS (0 to 59)
Section 8.3
02h
Minutes
EMON
MINUTES (0 to 59)
03h
Hours_xx_xx_00
HR_XX_XX_00 (0 to 99)
04h
Hours_xx_00_xx
HR_XX_00_XX (0 to 99)
05h
Hours_00_xx_xx
HR_00_XX_XX (0 to 99)
06h
not used
-
-
-
-
-
-
-
-
07h
not used
-
-
-
-
-
-
-
-
Stop-watch alarm1
08h
Second_alm1
-
SEC_ALM1 (0 to 59)
09h
Minute_alm1
-
MIN_ALM1 (0 to 59)
0Ah
Hr_xx_xx_00_alm1
HR_XX_XX_00_ALM1 (0 to 99)
0Bh
Hr_xx_00_xx_alm1
HR_XX_00_XX_ALM1 (0 to 99)
0Ch
Hr_00_xx_xx_alm1
HR_00_XX_XX_ALM1 (0 to 99)
Section 8.4
Stop-watch alarm2
0Dh
Minute_alm2
-
MIN_ALM2 (0 to 59)
0Eh
Hr_xx_00_alm2
HR_XX_00_ALM2 (0 to 99)
0Fh
Hr_00_xx_alm2
HR_00_XX_ALM2 (0 to 99)
Section 8.4
Stop-watch alarm enables
Alarm_enables
HR_00_XX
_A2E
HR_XX_00
_A2E
MIN_A2E
HR_00_XX
_XX_A1E
HR_XX_00
_XX_A1E
HR_XX_XX MIN_A1E
_00_A1E
SEC_A1E
Section 8.4
PCF85363A
10 of 95
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10h
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Rev. 3 — 18 November 2015
All information provided in this document is subject to legal disclaimers.
00h
01h
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Address
Register name
Bit
NXP Semiconductors
PCF85363A
Product data sheet
Table 6.
Stop-watch mode time registers …continued
Bit positions labeled as - are not implemented. After reset, all registers are set according to Table 62 on page 58. …continued
Reference
7
6
5
4
3
2
1
0
Stop-watch timestamp1 (TSR1)
11h
TSR1_seconds
-
TSR1_SECONDS (0 to 59)
12h
TSR1_minutes
-
TSR1_MINUTES (0 to 59)
13h
TSR1_hr_xx_xx_00
TSR1_HR_XX_XX_00 (0 to 99)
14h
TSR1_hr_xx_00_xx
TSR1_HR_XX_00_XX (0 to 99)
15h
TSR1_hr_00_xx_xx
TSR1_HR_00_XX_XX (0 to 99)
16h
not used
-
-
-
Section 8.7
-
-
-
-
-
Stop-watch timestamp2 (TSR2)
TSR2_seconds
-
TSR2_SECONDS (0 to 59)
18h
TSR2_minutes
-
TSR2_MINUTES (0 to 59)
19h
TSR2_hr_xx_xx_00
TSR2_HR_XX_XX_00 (0 to 99)
1Ah
TSR2_hr_xx_00_xx
TSR2_HR_XX_00_XX (0 to 99)
1Bh
TSR2_hr_00_xx_xx
TSR2_HR_00_XX_XX (0 to 99)
1Ch
not used
-
-
TSR3_seconds
-
TSR3_SECONDS (0 to 59)
1Eh
TSR3_minutes
-
TSR3_MINUTES (0 to 59)
1Fh
TSR3_hr_xx_xx_00
TSR3_HR_XX_XX_00 (0 to 99)
20h
TSR3_hr_xx_00_xx
TSR3_HR_XX_00_XX (0 to 99)
21h
TSR3_hr_00_xx_xx
TSR3_HR_00_XX_XX (0 to 99)
22h
not used
-
-
Section 8.7
-
-
-
-
-
Stop-watch timestamp3 (TSR3)
1Dh
-
Section 8.7
-
-
TSR2M[2:0]
-
-
-
-
23h
TSR_mode
TSR3M[1:0]
TSR1M[1:0]
Section 8.7
PCF85363A
11 of 95
© NXP Semiconductors N.V. 2015. All rights reserved.
-
Stop-watch timestamp mode control
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Rev. 3 — 18 November 2015
All information provided in this document is subject to legal disclaimers.
17h
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NXP Semiconductors
PCF85363A
Product data sheet
8.1.2 Control registers overview
Table 7.
Control and function registers overview
Bit positions labeled as - are not implemented. After reset, all registers are set according to Table 62 on page 58.
Address
Register name
Bit
7
Reference
6
5
4
3
2
1
0
Offset register
24h
Offset
OFFSET[7:0]
Section 8.8
Control registers
Oscillator
CLKIV
OFFM
12_24
LOWJ
OSCD[1:0]
CL[1:0]
26h
Battery_switch
-
-
-
BSOFF
BSRR
27h
Pin_IO
CLKPM
TSPULL
TSL
TSIM
TSPM[1:0]
28h
Function
100TH
PI[1:0]
RTCM
STOPM
COF[2:0]
29h
INTA_enable
ILPA
PIEA
OIEA
A1IEA
A2IEA
TSRIEA
BSIEA
WDIEA
Section 8.9
2Ah
INTB_enable
ILPB
PIEB
OIEB
A1IEB
A2IEB
TSRIEB
BSIEB
WDIEB
Section 8.9
2Bh
Flags
PIF
A2F
A1F
WDF
BSF
TSR3F
TSR2F
TSR1F
Section 8.14
BSM[1:0]
Section 8.10
BSTH
INTAPM[1:0]
Section 8.11
Section 8.12
Section 8.13
Single RAM byte
2Ch
RAM_byte
B[7:0]
Section 8.6
WatchDog registers
2Dh
WatchDog
WDM
WDR[4:0]
WDS[1:0]
Section 8.5
Stop_enable
-
-
-
-
-
-
-
STOP
Section 8.16
Resets
CPR
0
1
0
SR
1
0
CTS
Section 8.15
Stop
2Eh
Reset
2Fh
RAM (64 byte)
RAM
B[7:0]
Section 8.17
PCF85363A
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Rev. 3 — 18 November 2015
All information provided in this document is subject to legal disclaimers.
25h
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.2 RTC mode time and date registers
RTC mode is enabled by setting RTCM = 0. These registers are coded in the BCD format
to simplify application use.
Default state is:
Time — 00:00:00.00
Date — 2000 01 01
Weekday — Saturday
Monitor bits — OS = 1, EMON = 0
Table 8.
Time and date registers in RTC mode (RTCM = 0)
Bit positions labeled as - are not implemented and return 0 when read.
Address
Register name
Upper-digit (ten’s place)
Digit (unit place)
00h
100th_seconds[1]
Bit 7
Bit 3
01h
Seconds
OS
0 to 5
0 to 9
02h
Minutes
EMON 0 to 5
0 to 9
03h
Hours[2]
-
-
04h
Days[3]
-
-
05h
Weekdays
-
-
-
-
-
06h
Months
-
-
-
0 to 1
0 to 9
07h
Years
0 to 9
Bit 6
Bit 5
Bit 4
0 to 9
Bit 2
Bit 1
Bit 0
0 to 9
AMPM 0 to 1
0 to 9
0 to 2
0 to 9
0 to 3
0 to 9
0 to 6
0 to 9
[1]
The 100th_seconds register is only available when the 100TH mode is enabled, see Section 8.13.1. When
the 100TH mode is disabled, this register always returns 0.
[2]
Hour mode is set by the 12_24 bit in the Oscillator register, see Section 8.10 on page 41.
[3]
If the year counter contains a value, which is exactly divisible by 4, the PCF85363A compensates for leap
years by adding a 29th day to February.
8.2.1 Definition of BCD
The Binary-Coded Decimal (BCD) is an encoding of numbers where each digit is
represented by a separate bit field. Each bit field may only contain the values 0 to 9. In this
way, decimal numbers and counting is implemented.
Example: 59 encoded as an entire number is represented by 3Bh or 111011. In BCD the 5
is represented as 5h or 0101 and the 9 as 9h or 1001 which combines to 59h.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Table 9.
BCD coding
Value in
decimal
Upper-digit (ten’s place)
Digit (unit place)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
00
0
0
0
0
0
0
0
0
01
0
0
0
1
0
0
0
1
02
0
0
1
0
0
0
1
0
:
:
:
:
:
:
:
:
:
09
1
0
0
1
1
0
0
1
10
0
0
0
0
0
0
0
0
:
:
:
:
:
:
:
:
:
98
1
0
0
1
1
0
0
0
99
1
0
0
1
1
0
0
1
8.2.2 OS: Oscillator stop
When the oscillator of the PCF85363A is stopped, the OS status bit is set. The oscillator
can be stopped, for example, by connecting one of the oscillator pins OSCI or OSCO to
ground. The oscillator is considered to be stopped during the time between power-on and
stable crystal resonance. This time can be in the range of 200 ms to 2 s depending on
crystal type, temperature, and supply voltage.
The status bit remains set until cleared by command (see Figure 8). If the bit cannot be
cleared, then the oscillator is not running. This method can be used to monitor the
oscillator and to determine if the supply voltage has reduced to the point where oscillation
fails.
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Fig 8.
DDD
OS status bit
8.2.3 EMON: event monitor
The EMON can be used to monitor the status of all the flags in the Flags register, see
Section 8.14 on page 56. When one or more of the flags is set, then the EMON bit returns
a logic 1. The EMON bit cannot be cleared. EMON returns a logic 0 when all flags are
cleared.
See Figure 21 on page 40 for a pictorial representation.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.2.4 Definition of weekdays
Definition may be reassigned by the user.
Table 10.
Weekday assignments
Day
Bit
2
1
0
Sunday
0
0
0
Monday
0
0
1
Tuesday
0
1
0
Wednesday
0
1
1
Thursday
1
0
0
Friday
1
0
1
Saturday
1
1
0
8.2.5 Definition of months
Table 11.
Month
PCF85363A
Product data sheet
Month assignments in BCD format
Upper-digit
(ten’s place)
Digit (unit place)
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
January
0
0
0
0
1
February
0
0
0
1
0
March
0
0
0
1
1
April
0
0
1
0
0
May
0
0
1
0
1
June
0
0
1
1
0
July
0
0
1
1
1
August
0
1
0
0
0
September
0
1
0
0
1
October
1
0
0
0
0
November
1
0
0
0
1
December
1
0
0
1
0
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.2.6 Setting and reading the time in RTC mode
Figure 9 shows the data flow and data dependencies starting from the 100 Hz clock tick.
+]WLFN
7+B6(&21'
+]WLFN
7+
6(&21'6
0,187(6
B
/($3<($5
&$/&8/$7,21
+2856
'$<6
:((.'$<
0217+6
<($56
DDD
Fig 9.
Data flow for the time function
During read operations, the time counting circuits (memory locations 00h through 07h) are
copied into an output register. The RTC continues counting in the background.
When reading or writing the time it is very important to make a read or write access in one
go, that is, setting or reading 100th seconds through to years should be made in one
single access. Failing to comply with this method could result in the time becoming
corrupted.
As an example, if the time (seconds through to hours) is set in one access and then in a
second access the date is set, it is possible that the time increments between the two
accesses. A similar problem exists when reading. A roll-over may occur between reads
thus giving the minutes from one moment and the hours from the next.
Before setting the time, the STOP bit should be set and the prescalers should be cleared
(see Section 8.16 “Stop_enable register” on page 59).
An example of setting the time: 14 hours, 23 minutes and 19 seconds.
•
•
•
•
PCF85363A
Product data sheet
I2C START condition
I2C slave address + write (A2h)
register address (2Eh)
write data (set STOP, 01h)
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NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
•
•
•
•
•
•
•
•
•
•
write data (clear prescaler, A4h)
write data (100th seconds, 00h)
write data (Hours, 14h)
write data (Minutes, 23h)
write data (Seconds, 19h)
I2C START condition
I2C slave address + write (A2h)
register address (2Eh)
write data (clear STOP, 00h). Time starts counting from this point
I2C STOP condition
8.3 Stop-watch mode time registers
These registers are coded in the BCD format to simplify application use.
Stop-watch mode is enabled by setting RTCM = 1. In stop-watch mode, the PCF85363A
counts from 100th seconds to 999999 hours. There are no days, weekdays, months or
year registers.
Default state is:
Time — 000000:00:00.00
Monitor bits — OS = 1, EMON = 0 (see Section 8.2.2 on page 14 and Section 8.2.3 on
page 14)
Table 12. Time registers in stop-watch mode (RTCM = 1)
Bit positions labeled as - are not implemented and return 0 when read.
Address
Register name
00h
100th_seconds[1]
0 to 9
01h
Seconds
OS
0 to 5
0 to 9
02h
Minutes
EMON 0 to 5
0 to 9
03h
Hours_xx_xx_00 0 to 9
0 to 9
04h
Hours_xx_00_xx 0 to 9
0 to 9
05h
Hours_00_xx_xx 0 to 9
0 to 9
06h
not used
-
-
-
-
07h
not used
-
-
-
-
[1]
Upper-digit (ten’s place)
Digit (unit place)
Bit 7
Bit 3
Bit 6
Bit 5
Bit 4
Bit 2
Bit 1
Bit 0
-
-
-
-
-
-
-
-
0 to 9
The 100th_seconds register is only available when the 100TH mode is enabled, see Section 8.13.1 on
page 53. When the 100TH mode is disabled, this register always returns 0.
8.3.1 Setting and reading the time in stop-watch mode
Figure 10 shows the data flow and data dependencies starting from the 100 Hz clock tick.
During read operations, the time counting circuits (memory locations 00h through 07h) are
copied into an output register. The RTC continues counting in the background.
PCF85363A
Product data sheet
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
When reading or writing the time it is very important to make a read or write access in one
go, that is, setting or reading 100th_seconds through to HR_00_xx_xx should be made in
one single access. Failing to comply with this method could result in the time becoming
corrupted.
As an example, if the seconds value is set in one access and then in a following access
the minutes value is set, it is possible that the time increments between the two accesses.
A similar problem exists when reading. A roll-over may occur between reads thus giving
the seconds from one moment and the minutes from the next.
+]WLFN
7+B6(&21'6
+]WLFN
7+
6(&21'6
0,187(6
+5B;;B;;B
+5B;;BB;;
+5BB;;B;;
DDD
Fig 10. Data flow for the stop-watch function
8.4 Alarms
There are two independent alarms. Each is separately configured and may be used to
generate an interrupt. In RTC mode, an alarm is configured for time and date. In
stop-watch mode when the RTC is functioning as an elapsed time counter, an alarm is
configured for time only.
8.4.1 Alarms in RTC mode
In RTC mode, Alarm 1 can be configured from seconds to months. Alarm 2 operates on
minutes, hours and weekday. Each segment of the time is independently enabled. Alarms
can be output on the INTA and INTB pins.
8.4.1.1
Alarm1 and alarm2 registers in RTC mode
Setting the time for alarm1: Only the information which is relevant for the alarm condition
must to be programmed. The unused parts are ignored.
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NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Table 13. Alarm1 and alarm2 registers in RTC mode coded in BCD (RTCM = 0)
Bit positions labeled as - are not implemented.
Address
Register name
Upper-digit (ten’s place)
Digit (unit place)
Bit 7
Bit 6
Bit 3
Bit 5
Bit 4
Bit 2
Bit 1
Bit 0
RTC alarm1 registers
08h
Second_alarm1
-
0 to 5
0 to 9
09h
Minute_alarm1
-
0 to 5
0 to 9
0Ah
Hour_alarm1
-
-
AMPM 0 to 1
0 to 9
0 to 2
0 to 9
0 to 9
0Bh
Day_alarm1
-
-
0 to 3
0Ch
Month_alarm1
-
-
-
0 to 1
0 to 9
RTC alarm2 registers
0Dh
Minute_alarm2
-
0 to 5
0Eh
Hour_alarm2
-
-
0Fh
8.4.1.2
Weekday_alarm2 -
-
0 to 9
AMPM 0 to 1
0 to 9
0 to 2
0 to 9
-
-
-
0 to 6
Alarm1 and alarm2 control in RTC mode
Table 14.
Bit
Alarm_enables- alarm enable control register (address 10h) bit description
Symbol
Value
Description
RTC alarm2
7
6
WDAY_A2E
weekday alarm2 enable
0[1]
disabled
1
enabled
HR_A2E
hour alarm2 enable
0[1]
disabled
1
5
MIN_A2E
enabled
minute alarm2 enable
0[1]
disabled
1
enabled
RTC alarm1
4
3
2
1
PCF85363A
Product data sheet
MON_A1E
month alarm1 enable
0[1]
disabled
1
enabled
DAY_A1E
day alarm1 enable
0[1]
disabled
1
enabled
HR_A1E
hour alarm1 enable
0[1]
disabled
1
enabled
MIN_A1E
minute alarm1 enable
0[1]
disabled
1
enabled
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PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Table 14.
Bit
Symbol
0
SEC_A1E
[1]
8.4.1.3
Alarm_enables- alarm enable control register (address 10h) bit description
Value
Description
second alarm1 enable
0[1]
disabled
1
enabled
Default value.
Alarm1 and alarm2 function in RTC mode
The registers at addresses 08h through 0Ch contain alarm1 information. When one or
more of these registers is loaded with second, minute, hour, day, or month, and its
corresponding alarm enable bit (SEC_A1E to MON_A1E) is set logic 1, then that
information is compared with the current second, minute, hour, day, and month.
The registers at addresses 0Dh through 0Fh contain alarm2 information. When one or
more of these registers is loaded with minute, hour or weekday, and its corresponding
alarm enable bit (MIN_A2E to WDAY_A2E) is set logic 1, then that information is
compared with the current minute, hour and weekday.
Alarm registers which have their alarm enable bit at logic 0 are ignored.
When the time increments to match the enabled alarms, the alarm flag in the Flags
register (Section 8.14 on page 56) is set. A1F for alarm1 and A2F for alarm2. The alarm
flag is cleared by command.
When the time increments to match the enabled alarms, an interrupt can be generated.
See Section 8.4.3 “Alarm interrupts”.
PCF85363A
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20 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
H[DPSOH
FKHFNQRZVLJQDO
6(&B$(
6(&B$( 6(&21'$/$50
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+2857,0(
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FKHFNQRZVLJQDO
0,1B$(
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0,187(7,0(
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(1) Only when all enabled alarm settings are matching.
The flag is set only on increment to a matched case (and not all the time it is equal).
Fig 11. Alarm1 and alarm2 function block diagram (RTC mode)
8.4.2 Alarms in stop-watch mode
In stop-watch mode, Alarm 1 can be configured from seconds to 999999 hours. Alarm 2
operates on minutes up to 9999 hours.
PCF85363A
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.4.2.1
Alarm1 and alarm2 registers in stop-watch mode
Setting the time for alarm1 and alarm2: Only the information which is relevant for the
alarm condition must to be programmed. The unused parts are ignored.
Table 15. Alarm1 and alarm2 registers in stop-watch mode coded in BCD (RTCM = 1)
Bit positions labeled as - are not implemented.
Address
Register name
Upper-digit (ten’s place)
Digit (unit place)
Bit 7
Bit 6
Bit 3
Bit 5
Bit 4
Bit 2
Bit 1
Bit 0
Stop-watch alarm1 registers
08h
Second_alm1
-
0 to 5
0 to 9
09h
Minute_alm1
-
0 to 5
0 to 9
09h
Hr_xx_xx_00_alm1
0 to 9
0Bh
Hr_xx_00_xx_alm1
0 to 9
0 to 9
0Ch
Hr_00_xx_xx_alm1
0 to 9
0 to 9
0 to 9
Stop-watch alarm2 registers
8.4.2.2
0Dh
Minute_alm2
-
0 to 5
0 to 9
0Eh
Hr_xx_00_alm2
0 to 9
0 to 9
0Fh
Hr_00_xx_alm2
0 to 9
0 to 9
Alarm1 and alarm2 control in stop-watch mode
Table 16.
Bit
Alarm_enables- alarm enable control register (address 10h) bit description
Symbol
Value
Description
Stop-watch alarm2
7
6
5
HR_00_XX_A2E
thousands of hours alarm2 enable
0[1]
disabled
1
enabled
HR_XX_00_A2E
tens of hours alarm2 enable
0[1]
disabled
1
enabled
MIN_A2E
minute alarm2 enable
0[1]
disabled
1
enabled
Stop-watch alarm1
4
HR_00_XX_XX_A1E
100 thousands of hours alarm1 enable
0[1]
disabled
1
3
2
PCF85363A
Product data sheet
HR_XX_00_XX_A1E
enabled
thousands of hours alarm1 enable
0[1]
disabled
1
enabled
HR_XX_XX_00_A1E
tens of hour alarm1 enable
0[1]
disabled
1
enabled
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PCF85363A
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Table 16.
Bit
Symbol
1
MIN_A1E
0
[1]
8.4.2.3
Alarm_enables- alarm enable control register (address 10h) bit description
Value
Description
minute alarm1 enable
0[1]
disabled
1
enabled
SEC_A1E
second alarm1 enable
0[1]
disabled
1
enabled
Default value.
Alarm1 and alarm2 function in stop-watch mode
The registers at addresses 08h through 0Ch contain alarm1 information. When one or
more of these registers is loaded with second, minute, and hours, and its corresponding
alarm enable bit (SEC_A1E to HR_00_XX_XX_A1E) is set logic 1, then that information is
compared with the current second, minute, and hours.
The registers at addresses 0Dh through 0Fh contain alarm2 information. When one or
more of these registers is loaded with minute and hours, and its corresponding alarm
enable bit (MIN_A2E to HR_00_XX_A2E) is set logic 1, then that information is compared
with the current minute and hours.
Alarm registers which have their alarm enable bit at logic 0 are ignored.
When the time increments to match the enabled alarms, the alarm flag in the Flags
register (Section 8.14 on page 56) is set. A1F for alarm1 and A2F for alarm2. The alarm
flag is cleared by command.
When the time increments to match the enabled alarms, an interrupt can be generated.
See Section 8.4.3 “Alarm interrupts”.
PCF85363A
Product data sheet
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Rev. 3 — 18 November 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
23 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
H[DPSOH
FKHFNQRZVLJQDO
6(&B$(
6(&21'$/$50
6(&B$( 6(&21'7,0(
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0,187($/$50
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(1) Only when all enabled alarm settings are matching.
The flag is set only on increment to a matched case (and not all the time it is equal).
Fig 12. Alarm1 and alarm2 function block diagram (stop-watch mode)
8.4.3 Alarm interrupts
The generation of interrupts from the alarm functions is controlled via the alarm interrupt
enable bits; A1IEA, A1IEB, A2IEA, A2IEB. These bits are in registers INTA_enable
(address 29h) and INTB_enable (address 2Ah).
PCF85363A
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PCF85363A
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
The assertion of flags A1F or A2F can be used to generate an interrupt at the pins INTA
and INTB. The interrupt may be generated as a pulse signal every time the time
increments to match the alarm setting or as a permanently active signal which follows the
condition of bit A1F and/or A2F. See Section 8.9 on page 37 for interrupt control.
A1F and A2F remain set until cleared by command. Once an alarm flag has been cleared,
it will only be set again when the time increments to match the alarm condition once more.
When an interrupt pin is configured to pulse mode and if an alarm flag is not cleared and
the time increments to match the alarm condition again, then a repeated interrupt pulse
will be generated.
8.5 WatchDog
Table 17.
WatchDog - WatchDog control and register (address 2Dh) bit description
Bit
Symbol
7
WDM
6 to 2
Value
Description
WatchDog mode
0[1]
single shot
1
repeat mode
WDR[4:0]
WatchDog register bits
0h[1]
to 1Fh
Write: WatchDog counter load value
0h to 1Fh
1 to 0
WDS[1:0]
Read: current counter value
WatchDog step size (source clock)
00[1]
[1]
4 seconds (0.25 Hz)
01
1 second (1 Hz)
10
1⁄
4
11
1⁄
16
second (4 Hz)
second (16 Hz)
Default value.
8.5.1 WatchDog functions
The WatchDog has four selectable step sizes allowing for periods in the range from
62.5 ms to 124 seconds. For periods greater than 2 minutes, the alarm function can be
used.
WatchDog-duration = WDR stepsize
Table 18.
Product data sheet
WatchDog durations
WDS[1:0] WatchDog step Delay
size[1]
Minimum WatchDog duration
WDR = 1
Maximum WatchDog duration
WDR = 31
00
4s
4s
124 s
01
1s
1s
31 s
10
1⁄
4
0.25 s
7.75 s
11
1⁄
16
0.0625 s
1.9375 s
[1]
PCF85363A
(1)
s
s
Time periods can be affected by correction pulses.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Remark: Note that all timings are generated from the 32.768 kHz oscillator and are based
on the assumption that there is 0 ppm deviation. Deviation in oscillator frequency results
in deviation in timings. This is not applicable to interface timing.
The WatchDog counts down from a software-loaded 5-bit binary value, WDR[4:0], in
register WatchDog. Loading the counter with 0 stops the WatchDog. Loading the counter
with a non-0 value starts the counter. Values from 1 to 31 are allowed.
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In this example, it is assumed that the WatchDog flag (WDF) is cleared before the next WatchDog
period expires and that the interrupt output is set to pulsed mode.
Fig 13. WatchDog repeat mode
If a new value of WDR[4:0] is written before the end of the current WatchDog period, then
this value takes immediate effect.
When starting the timer for the first time or when reloading WDR[4:0] before the end of the
current period, the first period has an uncertainty of maximum one count. The uncertainty
is a result of loading the WDR[4:0] from the interface clock which is asynchronous from
the WatchDog source clock. Subsequent WatchDog periods do not have such variation.
Reading the WatchDog register returns the current value of the WatchDog counter (see
Figure 13) and not the initial value WDR[4:0]. Since it is not possible to freeze the
WatchDog counter during read back, it is recommended to read the register twice and
check for consistent results.
8.5.1.1
WatchDog repeat mode
In repeat mode, at the end of every WatchDog period, the WatchDog flag (bit WDF in the
Flags register, Section 8.14 on page 56) is set and the counter automatically reloads and
starts the next WatchDog period. An example is given in Figure 13. The asserted bit WDF
can be used to generate an interrupt. Bit WDF can only be cleared by command.
8.5.1.2
WatchDog single shot mode
In single shot mode, at the end of the countdown period, the WatchDog flag (bit WDF in
the Flags register, Section 8.14 on page 56) is set and the counter stops with the value 0.
The WatchDog register must be reloaded to start another WatchDog period.
PCF85363A
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NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
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Fig 14. WatchDog single shot mode
8.5.1.3
WatchDog interrupts
The generation of interrupts from the WatchDog functions is controlled via the WatchDog
interrupt enable bits; WDIEA and WDIEB. These bits are in registers INTA_enable
(address 29h) and INTB_enable (address 2Ah).
The assertion of the flag WDF can be used to generate an interrupt at pins INTA and
INTB. The interrupt may be generated as a pulsed signal every time the WatchDog
counter reaches the end of the countdown period. Alternatively as a permanently active
signal which follows the condition of bit WDF. WDF remains set until cleared by command.
When enabled, interrupts are triggered every time the WatchDog counter reaches the end
of the countdown period and even if the WDF is not cleared, an interrupt pulse can be
generated.
See Section 8.9 on page 37 for interrupt control.
8.6 Single RAM byte
Table 19.
Bit
7 to 0
RAM_byte - 8-bit RAM register (address 2Ch) bit description
Symbol
Value
Description
B[7:0]
00000000[1] to
single RAM byte content
11111111
[1]
Default value.
The PCF85363A provides a free single RAM byte, which can be used for any purpose, for
example, status bits of the system.
8.7 Timestamps
There are three timestamp registers which can be independently configured to record the
time for battery switch-over events and/or transitions on the TS pin.
Each timestamp register has an associated flag. It is also possible to generate an interrupt
signal for every timestamp register update.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Timestamps work in both RTC and stop-watch mode. During battery operation, the
mechanical switch detector may also be used to trigger the timestamp.
The timestamp registers are read only and cannot be written. It is possible to set all three
registers to 0 with the CTS instruction in the Resets register (Section 8.15 on page 57).
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Fig 15. Timestamp
The mode for each register is controlled by the TSR_mode register.
PCF85363A
Product data sheet
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Table 20.
Bit
TSR_mode - timestamp mode control register (address 23h) bit description
Symbol
Value
Description
Timestamp3 (TSR3)
7 to 6
TSR3M[1:0]
timestamp register 3 mode
00[1]
no timestamp
01
FB, record First time switch to Battery event
10
LB, record Last time switch to Battery event
LV, record Last time switch to VDD event
11
5
-
0
not used
Timestamp2 (TSR2)
4 to 2
TSR2M[2:0]
timestamp register 2 mode
000[1]
no timestamp
001
FB, record First time switch to Battery event
010
LB, record Last time switch to Battery event
011
LV, record Last time switch to VDD event
100
FE, record First TS pin Event
101
LE, record Last TS pin Event
110 to 111
no timestamp
Timestamp1 (TSR1)
1 to 0
[1]
TSR1M[1:0]
timestamp register 1 mode
00[1]
no timestamp
01
FE, record First TS pin Event
10
LE, record Last TS pin Event
11
no timestamp
Default value.
First event means that the time is only stored on the first event and not recorded for
subsequent events. When the first event occurs, the associated timestamp flag is set.
When the flag is cleared, then a new ‘first’ event is recorded. See Figure 16 and
Figure 17.
Last event means that the time is stored on every event. When an event occurs, the
associated timestamp flag is set. It is not necessary to clear the flag before a new event is
recorded.
Interrupts can be generated in INTA pin and/or INTB pin. Interrupts are generated every
time a timestamp register is updated. Interrupt generation is not conditional on the state of
the timestamp flags. See Section 8.7.1.
PCF85363A
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PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
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Fig 16. Example battery switch-over timestamp
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(1) TS pin set to active HIGH (TSL = 0), see register Pin_IO (address 27h), Section 8.12.
Fig 17. Example TS pin driven timestamp
The recorded time is stored in the associated timestamp register. The time format
depends on the RTC mode. The timestamp registers follows the time format of the time
registers.
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NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Table 21. Timestamp registers in RTC mode (RTCM = 0)
Bit positions labeled as - are not implemented and return 0 when read.
Address
Register name
Upper-digit (ten’s place)
Digit (unit place)
Bit 7
Bit 6
Bit 3
Bit 5
Bit 4
Bit 2
Bit 1
Bit 0
RTC timestamp1 (TSR1)
11h
TSR1_seconds
-
0 to 5
0 to 9
12h
TSR1_minutes
-
0 to 5
0 to 9
13h
TSR1_hours
-
-
AMPM 0 to 1
0 to 9
0 to 2
0 to 9
0 to 9
14h
TSR1_days
-
-
0 to 3
15h
TSR1_months
-
-
-
16h
TSR1_years
0 to 9
0 to 1
0 to 9
0 to 9
RTC timestamp2 (TSR2)
17h
TSR2_seconds
-
0 to 5
0 to 9
18h
TSR2_minutes
-
0 to 5
0 to 9
19h
TSR2_hours
-
-
AMPM 0 to 1
0 to 9
0 to 2
0 to 9
0 to 9
1Ah
TSR2_days
-
-
0 to 3
1Bh
TSR2_months
-
-
-
1Ch
TSR2_years
0 to 9
0 to 1
0 to 9
0 to 9
RTC timestamp3 (TSR3)
PCF85363A
Product data sheet
1Dh
TSR3_seconds
-
0 to 5
0 to 9
1Eh
TSR3_minutes
-
0 to 5
0 to 9
1Fh
TSR3_hours
-
-
AMPM 0 to 1
0 to 9
0 to 2
0 to 9
0 to 9
20h
TSR3_days
-
-
0 to 3
21h
TSR3_months
-
-
-
22h
TSR3_years
0 to 9
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0 to 1
0 to 9
0 to 9
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NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Table 22. timestamp registers in stop-watch mode (RTCM = 1)
Bit positions labeled as - are not implemented and return 0 when read.
Address Register name
Upper-digit (ten’s place)
Digit (unit place)
Bit 7
Bit 3
Bit 6
Bit 5
Bit 4
Bit 2
Bit 1
Bit 0
-
-
-
-
-
-
-
-
-
Stop-watch timestamp1 (TSR1)
11h
TSR1_seconds
-
0 to 5
0 to 9
12h
TSR1_minutes
-
0 to 5
0 to 9
13h
TSR1_hr_xx_xx_00
0 to 9
0 to 9
14h
TSR1_hr_xx_00_xx
0 to 9
0 to 9
15h
TSR1_hr_00_xx_xx
0 to 9
0 to 9
16h
not used
-
-
-
-
-
Stop-watch timestamp2 (TSR2)
17h
TSR2_seconds
-
0 to 5
0 to 9
18h
TSR2_minutes
-
0 to 5
0 to 9
19h
TSR2_hr_xx_xx_00
0 to 9
0 to 9
1Ah
TSR2_hr_xx_00_xx
0 to 9
0 to 9
1Bh
TSR2_hr_00_xx_xx
0 to 9
0 to 9
1Ch
not used
-
-
-
-
-
Stop-watch timestamp3 (TSR3)
1Dh
TSR3_seconds
-
0 to 5
0 to 9
1Eh
TSR3_minutes
-
0 to 5
0 to 9
1Fh
TSR3_hr_xx_xx_00
0 to 9
0 to 9
20h
TSR3_hr_xx_00_xx
0 to 9
0 to 9
21h
TSR3_hr_00_xx_xx
0 to 9
22h
not used
-
0 to 9
-
-
-
-
8.7.1 Timestamps interrupts
The generation of interrupts from the timestamp functions is controlled via the timestamp
interrupt enable bits; TSRIEA and TSRIEB. These bits are in registers INTA_enable
(address 29h) and INTB_enable (address 2Ah).
The loading of new information into one of the timestamp registers can be used to
generate an interrupt at pins INTA and INTB. The interrupt may be generated as a pulsed
signal every time a timestamp register updates or as a permanently active signal which
follows the condition of timestamp flags, TSR1F to TSR3F. The timestamp flags remain
set until cleared by command.
When enabled, interrupts are triggered every time a timestamp register updates and even
if the associated flag is not cleared, an interrupt pulse can be generated.
See Section 8.9 on page 37 for interrupt control.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.8 Offset register
The PCF85363A incorporates an offset register (address 24h) which can be used to
implement several functions, such as:
• Accuracy tuning
• Aging adjustment
• Temperature compensation
Table 23.
Offset - offset register (address 24h) bit description
Bit
Symbol
Value
Description
7 to 0
OFFSET[7:0]
see Table 25
offset value
There are two modes which define the correction period, normal mode and fast mode.
The normal mode is suitable for offset trimming. The fast mode is suitable for dynamic
offset correction e.g. implementing a temperature correction. The fast mode consumes
more current. Offset mode is defined by bit OFFM in the Oscillator register (Section 8.10).
Table 24. OFFM bit - oscillator control register (address 25h)
See Section 8.10 on page 41.
Bit
Symbol
6
OFFM
[1]
Value
Description
offset mode bit
0[1]
normal mode: correction is made every 4
hours; 2.170 ppm/step
1
fast mode: correction is made once every 8
minutes;2.0345 ppm/step
Default value.
For OFFM = 0, each LSB introduces an offset of 2.170 ppm. For OFFM = 1, each LSB
introduces an offset of 2.0345 ppm. The offset value is coded in two’s complement giving
a range of +127 LSB to 128 LSB, see Table 25.
Table 25.
Offset values
OFFSET[7:0]
Offset value in
decimal
Offset value in ppm
Normal mode
OFFM = 0
Fast mode
OFFM = 1
01111111
+127
+275.590
+258.3815
01111110
+126
+273.420
+256.3470
:
:
:
:
00000010
+2
+4.340
+4.0690
00000001
+1
+2.170
+2.0345
0
0[1]
0[1]
00000000[1]
11111111
1
2.170
2.0345
11111110
2
4.340
4.0690
:
:
:
:
10000001
127
275.590
258.3815
10000000
128
277.760
260.416
[1]
PCF85363A
Product data sheet
Default value.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
The correction is made by adding or subtracting clock correction pulses, thereby changing
the period of a single second but not by changing the oscillator frequency.
It is possible to monitor when correction pulses are applied. See Section 8.8.4.
8.8.1 Correction when OFFM = 0
The correction is triggered once every four hours and then correction pulses are applied
once per minute until the programmed correction values have been implemented.
Table 26.
Correction pulses for OFFM = 0
Correction value
Every nth hour
+1 or 1
4
00
+2 or 2
4
00 and 01
+3 or 3
4
00, 01, and 02
:
:
:
Actual minute
+59 or 59
4
00 to 58
+60 or 60
4
00 to 59
+61 or 61
4
00 to 59
4+1
00
+62 or 62
4
00 to 59
4+1
00 and 01
:
:
:
+123 or 123
4
00 to 59
4+1
00 to 59
128
4+2
00, 01, and 02
4
00 to 59
4+1
00 to 59
4+2
00 to 07
8.8.2 Correction when OFFM = 1
The correction is triggered once every eight minutes and then correction pulses are
applied once per second until the programmed correction values have been implemented.
Clock correction is made more frequently in OFFM = 1; however, this can result in higher
power consumption.
PCF85363A
Product data sheet
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Table 27.
Correction value
Every nth minute
Actual second
+1 or 1
8
00
+2 or 2
8
00 and 01
+3 or 3
8
00, 01, and 02
:
:
:
+59 or 59
8
00 to 58
+60 or 60
8
00 to 59
+61 or 61
8
00 to 59
8+1
00
+62 or 62
8
00 to 59
8+1
00 and 01
:
:
:
+123 or 123
8
00 to 59
8+1
00 to 59
128
PCF85363A
Product data sheet
Correction pulses for OFFM = 1
8+2
00, 01, and 02
8
00 to 59
8+1
00 to 59
8+2
00 to 07
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.8.3 Offset calibration workflow
The calibration offset has to be calculated based on the time. Figure 18 shows the
workflow how the offset register values can be calculated:
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Fig 18. Offset calibration calculation workflow
PCF85363A
Product data sheet
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
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With the offset calibration an accuracy of 1 ppm (0.5 offset per LSB) can be reached (see
Table 25).
1 ppm corresponds to a time deviation of 0.0864 seconds per day.
(1) 4 correction pulses in OFFM = 0 correspond to 8.680 ppm.
(2) 4 correction pulses in OFFM = 1 correspond to 8.138 ppm.
(3) Reachable accuracy zone.
Fig 19. Result of offset calibration
8.8.4 Offset interrupts
The generation of interrupts from the offset functions is controlled via the offset interrupt
enable bits; OIEA and OIEB. These bits are in registers INTA_enable (address 29h) and
INTB_enable (address 2Ah).
Every time a correction pulse is made an interrupt pulse can be generated at pins INTA
and INTB. As there are is no offset calibration flag, it is only possible to generate pulse
interrupts.
See Section 8.9 on page 37 for interrupt control.
8.9 Interrupts
There are two interrupt output pins, INTA and INTB. Both pins have the same possible
sources and a dedicated register to control what is output. The pins can be used
independently from each other.
INTA data is output on the INTA pin. INTA is an interrupt output pin with open-drain drive.
INTA pin mode is controlled by INTAPM[1:0] bits in the Pin_IO register (Section 8.12 on
page 49).
INTB data is output on TS pin with push-pull drive. The TS pin must first be configured as
INTB output by setting TSIO[1:0] bits in the Pin_IO register (Section 8.12 on page 49).
Interrupts will only be output when the pin mode is correctly defined. Interrupts are output
from the IC as active LOW signals.
The registers INTA_enable (address 29h) and INTB_enable (address 2Ah) are used to
select which interrupts should be output on which pin.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Table 28.
INTA and INTB interrupt control bits
Bit
7
6
5
4
3
2
1
0
A2IEA
TSRIEA
BSIEA
WDIEA
TSRIEB
BSIEB
WDIEB
INTA_enable - INTA pin enable control (address 29h)
Symbol
ILPA
PIEA
OIEA
A1IEA
INTB_enable - INTB pin enable control (address 2Ah)
Symbol
ILPB
Table 29.
Bit
7
PIEB
OIEB
A1IEB
Definition of interrupt control bits
Symbol
Value
INTA
INTB
ILPA
ILPB
Description
level or pulse mode
0[1]
interrupt generates a pulse
1
6
5
4
3
PIEA
PIEB
OIEA
0[1]
no periodic interrupt generated
1
periodic interrupt generated
OIEB
A1IEA
offset correction interrupt enable
0[1]
no correction interrupt generated
1
interrupt generated from correction
A1IEB
A2IEA
interrupt follows flags (permanent signal)
periodic interrupt enable
alarm1 interrupt enable
0[1]
no alarm interrupt generated
1
alarm interrupt generated
A2IEB
alarm2 interrupt enable
0[1]
no alarm interrupt generated
1
2
1
0
[1]
A2IEB
TSRIEA
BSIEA
TSRIEB
0[1]
no timestamp register interrupt generated
1
timestamp register interrupt generated
BSIEB
WDIEA
alarm interrupt generated
timestamp register interrupt enable
battery switch interrupt enable
0[1]
no battery switch interrupt generated
1
battery switch interrupt generated
WDIEB
WatchDog interrupt enable
0[1]
no WatchDog interrupt generated
1
WatchDog interrupt generated
Default value.
8.9.1 ILPA/ILPB: interrupt level or pulse mode
Interrupts can be configured to generate a pulse or to send a continuous level (permanent
signal) which follows the state of the flag.
In pulse mode, an interrupt pulse is generated every time that the selected source
triggers.
Triggered means
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
•
•
•
•
•
•
for periodic interrupts, every time a period has elapsed
for offset correction, every time a correction pulse is initiated
for alarms, every time the time increments to match the alarm time
for timestamps, every time a register updates
for battery switch, every time the IC switches to or from battery
for WatchDog, every time the counter reaches the end of its count
The interrupt signal goes active coincident with the triggering event. The signal is cleared
by an internal 128 Hz clock. The internal clock is asynchronous to the triggering event and
so the pulse duration has a minimum period of one 128 Hz cycle and a maximum of two
128 Hz cycles. Interrupt pulses may be shortened by clearing the flag before the end of
the pulse period.
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Fig 20. Interrupt pulse width
In level mode, the interrupt signal follows the state of the flag. Only interrupts which are
enabled will affect the pin state. All enabled flags must be cleared for the interrupt signal
to be cleared.
The EMON is used only for monitoring all flags and can be read back in the minutes
register. See Section 8.2.3 on page 14.
8.9.2 Interrupt enable bits
The remainder of the bits in register INTA_enable (address 29h) and register
INTB_enable (address 2Ah) are used to select which interrupt data goes where. See
Figure 21 “Interrupt selection”
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Product data sheet
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NXP Semiconductors
PCF85363A
Product data sheet
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PCF85363A
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Rev. 3 — 18 November 2015
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PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.10 Oscillator register
Table 30.
Oscillator - oscillator control register (address 25h) bit description
Bit
7
6
5
4
3
2
1
0
Symbol
CLKIV
OFFM
12_24
LOWJ
OSCD[1:0]
CL[1:0]
Section
Section 8.16
Section 8.8
Section 8.10.3
Section 8.10.4
Section 8.10.5
Section 8.10.6
8.10.1 CLKIV: invert the clock output
Table 31.
CLKIV bit - oscillator control register (address 25h)
Bit
Symbol
7
CLKIV
[1]
Value
Description
output clock inversion
0[1]
non-inverting; LOWJ mode will affect rising
edge
1
inverted; LOWJ mode will affect falling edge
Default value.
The clock selected with the COF[2:0] bits (register Function, address 28h) can be
inverted. This is intended for use in conjunction with the low jitter mode, LOWJ. The low
jitter mode reduces the jitter for the rising edge of the output clock. If the reduced jitter
needs to be on the falling edge, for example when using an open-drain clock output, then
the CLKIV bit can be used to implement this.
8.10.2 OFFM: offset calibration mode
See Section 8.8 “Offset register” on page 33 for a full description of offset calibration.
8.10.3 12_24: 12 hour or 24 hour clock
Table 32.
12_24 bit - oscillator control register (address 25h)
Bit
Symbol
5
12_24
[1]
Value
Description
12 hour or 24 hour mode
0[1]
24 hour mode is selected
1
12 hour mode is selected
Default value.
In RTC mode, time counting can be configured for 24 hour clock or 12 hour clock with the
AMPM flag.
This bit is ignored in stop-watch mode.
8.10.4 LOWJ: low jitter mode
Table 33.
Bit
Symbol
4
LOWJ
[1]
PCF85363A
Product data sheet
LOWJ bit - oscillator control register (address 25h)
Value
Description
low jitter CLK output bit
0[1]
normal
1
reduced CLK output jitter; increase IDD
Default value.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Oscillator circuits suffer from jitter. In particular, ultra low-power oscillators like the one
used in the PCF85363A are optimized for power and not jitter. By setting the LOWJ bit,
the jitter performance can be improved at the cost of power consumption.
8.10.5 OSCD[1:0]: quartz oscillator drive control
Table 34.
OSCD[1:0] bits - oscillator control register (address 25h)
Bit
Symbol
3 to 2
OSCD[1:0]
[1]
Value
Description
oscillator drive bits
00[1]
normal drive; RS(max): 100 k
01
low drive; RS(max): 60 k; reduced IDD
10, 11
high drive; RS(max): 500 k; increased IDD
Default value.
The oscillator is designed to be used with quartz with a series resistance up to 100 k.
This covers the typical range of 32.768 kHz quartz crystals. Series resistance is also
referred to as: ESR, motional resistance, or RS.
A low drive mode is available for low series resistance quartz. This reduces the current
consumption.
For very high series resistance quartz, there is a high drive mode. Current consumption
increases substantially in this mode.
8.10.6 CL[1:0]: quartz oscillator load capacitance
Table 35.
CL[1:0] bits - oscillator control register (address 25h)
Bit
Symbol
1 to 0
CL[1:0]
[1]
Value
Description
internal oscillator capacitor selection for
quartz crystals with the corresponding load
capacitance of CL:
00[1]
7.0 pF
01
6.0 pF
10
12.5 pF
11
12.5 pF
Default value.
CL refers to the load capacitance of the oscillator circuit and allows for a certain amount of
package and PCB parasitic capacitance. When the oscillator circuit matches the CL
parameter of the quartz, then the frequency offset is zero.
The PCF85363A is designed to operate with quartz with CL values of 6.0 pF, 7.0 pF and
12.5 pF.
12.5 pF are generally the cheapest and most widely available, but also require the most
power to drive. The circuit also operates with 9.0 pF quartz, however the offset calibration
would be needed to compensate. If a 9.0 pF quartz is used, then it is recommended to set
CL to 7.0 pF.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.11 Battery switch register
This register configures the battery switch-over mode.
Associated with the battery switch-over is the battery switch flag (BSF) in the Flags
register (Section 8.14 on page 56). Whenever the IC switches to battery operation, the
flag is set. The flag can only be read when operating from VDD power, however an
interrupt pulse or static LOW signal can be generated whenever switching to battery. An
interrupt pulse can also be generated when switching back to VDD power. Examples are
given in Figure 23 and Figure 24.
When switched to battery, the VDD power domain is disabled. This means that I2C pins are
ignored, CLK output is disabled and Hi-Z, TS pin output mode is disabled and Hi-Z, TS
digital input is ignored and may be left floating. TS pin mechanical switch detector is
active. INTA output is still active for interrupt output and battery switch indication, but disabled for clock output.
Table 36.
Table 37.
IO pin behavior in battery mode
IO pin (mode)
VDD operation
VBAT operation
SCL
active input
disabled; may be left floating
SDA
active input/output
disabled; may be left floating
CLK
active output
disabled; Hi-Z
TS (output mode)
active output
disabled; Hi-Z
TS (digital input)
active input
disabled; may be left floating
TS (mechanical switch input)
active input
active input
INTA
active output
active interrupt output
Battery_switch - battery switch control (address 26h) bit description
Bit
7
6
5
4
3
2
1
0
Symbol
-
-
-
BSOFF
BSRR
BSM[1:0]
BSTH
Section
-
-
-
Section 8.11.1
Section 8.11.2
Section 8.11.3
Section 8.11.4
8.11.1 BSOFF: battery switch on/off control
Table 38.
BSOFF bit - battery switch control (address 26h) bit description
Bit
Symbol
4
BSOFF
[1]
Value
Description
battery switch on/off
0[1]
enable battery switch feature
1
disable battery switch feature
Default value.
The battery switch circuit may be disabled when not used. This disables all the circuit and
save power consumption. When disabled connect VBAT and VDD together.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.11.2 BSRR: battery switch internal refresh rate
Table 39.
BSRR bit - battery switch control (address 26h) bit description
Bit
Symbol
3
BSRR
[1]
Value
Description
battery switch refresh rate
0[1]
low
1
high
Default value.
Non-user bit. Recommended to leave set at default.
8.11.3 BSM[1:0]: battery switch mode
Table 40.
BSM[1:0] bits - battery switch control (address 26h) bit description
Bit
Symbol
2 to 1
BSM[1:0]
[1]
Value
Description
battery switch mode bits
00[1]
switching at the Vth level
01
switching at the VBAT level
10
switching at the higher level of Vth or VBAT
11
switching at the lower level of Vth or VBAT
Default value.
Switching is automatic and controlled by the voltages on the VBAT and VDD pins. There
are three modes:
• Compare VDD with an internal reference (Vth)
• Compare VDD with VBAT
• Compare VDD with an internal reference (Vth) and VBAT
The last mode is useful when a rechargeable battery is employed.
Table 41.
Battery switch-over modes
BSM[1:0]
Condition
Internal power
00
VDD > Vth
VDD
VDD < Vth
VBAT
01
VDD > VBAT
VDD
VDD < VBAT
VBAT
10
VDD > the higher of Vth or VBAT
VDD
VDD < the higher of Vth or VBAT
VBAT
VDD > the lower of Vth or VBAT
VDD
VDD < the lower of Vth or VBAT
VBAT
11
Due to the nature of the power switch circuit there is a switching hysteresis (see Figure 22
and Table 68).
PCF85363A
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
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Fig 22. Threshold voltage switching hysteresis
8.11.3.1
Switching at the Vth level, BSM[1:0] = 00
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PCF85363A
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NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.11.3.2
Switching at the VBAT level, BSM[1:0] = 01
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Fig 24. Switching at VBAT
PCF85363A
Product data sheet
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.11.3.3
Switching at the higher of VBAT or Vth level, BSM[1:0] = 10
With this mode switching takes place when VDD falls below the higher of Vth or VBAT. In
Figure 25, an example is given where the threshold is set to 1.5 V and a single cell battery
is connected to VBAT. In this example, switching to the battery voltage takes place when
VDD falls below Vth.
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PCF85363A
Product data sheet
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.11.3.4
Switching at the lower of VBAT and Vth level, BSM[1:0] = 11
With this mode switching takes place when VDD falls below the lower of Vth or VBAT. In
Figure 26, an example is given where the threshold is set to 1.5 V and a single cell battery
is connected to VBAT. In this example, switching to the battery voltage takes place when
VDD falls below VBAT.
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Fig 26. Switching at the lower of VBAT or Vth
8.11.4 BSTH: threshold voltage control
Table 42.
BSTH - battery switch control (address 26h) bit description
Bit
Symbol
0
BSTH
[1]
Value
Description
battery switch threshold voltage, Vth
0[1]
Vth = 1.5 V
1
Vth = 2.8 V
Default value.
The threshold for battery switch-over is selectable between two voltages, 1.5 V and 2.8 V.
8.11.5 Battery switch interrupts
The generation of interrupts from the battery switch function is controlled via the battery
switch interrupt enable bits; BSIEA and BSIEB. These bits are in registers INTA_enable
(address 29h) and INTB_enable (address 2Ah).
The assertion of the flag BSF (register Flags, address 2Bh) can be used to generate an
interrupt at pins INTA and INTB. The interrupt may be generated as a pulsed signal or
alternatively as a permanently active signal which follows the condition of bit BSF. BSF
remains set until cleared by command.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
When enabled, interrupts are triggered every time the battery switch circuit switches to
either battery or to VDD and even if the BSF is not cleared, an interrupt pulse can be
generated.
In addition, the INTA pin can be configured as a battery mode indicator
(INTAPM[1:0] = 00). See Section 8.12.6 on page 51. This mode differs from a general
interrupt signal in that it is only controlled by the current battery switch status.
See Section 8.9 on page 37 for interrupt control.
Remark: INTB pin is only active when the IC is operating from VDD.
8.12 Pin_IO register
Table 43.
Pin_IO- pin input output control register (address 27h) bit description
Bit
7
6
5
4
3
2
1
0
Symbol
CLKPM
TSPULL
TSL
TSIM
TSPM[1:0]
INTAPM[1:0]
Section
Section 8.12.1
Section 8.12.2
Section 8.12.3
Section 8.12.5
Section 8.12.4
Section 8.12.6
This register is used to define the input and output modes of the IC.
8.12.1 CLKPM: CLK pin mode control
Table 44.
CLKPM bit - Pin_IO control register (address 27h)
Bit
Symbol
7
CLKPM[1]
Value
Description
CLK pin mode
0[2]
enable CLK pin
1
disable CLK pin
[1]
CLK pin is not available on all package types.
[2]
Default value.
Setting the CLKPM bit disables the CLK output and force the pin to drive out a logic 0.
Clearing this bit enables the pad to output the selected clock frequency (see bits COF[2:0]
in the Function register, see Table 51 on page 53).
8.12.2 TSPULL: TS pin pull-up resistor value
Table 45.
TSPULL bit - Pin_IO control register (address 27h)
Bit
Symbol
6
TSPULL
[1]
Value
Description
TS pin pull-up resistor value
0[1]
80 k
1
40 k
Default value.
Controls the pull-up resistor value used in the mechanical switch detector. For
applications where there is a large capacitance on the TS pin e.g. from a long connecting
cable to the mechanical switch, the pull-up resistor value can be halved to improve switch
detection.
Using the low-resistance value increases current consumption when the switch is closed
i.e. shorting to VSS.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.12.3 TSL: TS pin level sense
Table 46.
TSL bit - Pin_IO control register (address 27h)
Bit
Symbol
5
TSL
[1]
Value
Description
TS pin input sense
0[1]
active HIGH
1
active LOW
Default value.
The active state of the TS pin can be defined for use as a timestamp trigger and/or as stop
control for the time counting. Active HIGH implies a transition from logic 0 to logic 1 is
active. Active LOW implies a transition from logic 1 to logic 0 is active.
8.12.4 TSPM[1:0]: TS pin I/O control
Table 47.
TSPM[1:0] bits - Pin_IO control register (address 27h)
Bit
Symbol
3 to 2
TSPM[1:0]
[1]
Value
Description
TS pin IO mode
00[1]
disabled; input can be left floating
01
INTB output; push-pull
10
CLK output; push-pull
11
input mode
Default value.
These bits control the operation of the TS pin.
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Fig 27. TS pin
TSIM is only considered when the TS pin is in input mode.
8.12.4.1
TS pin output mode; INTB
It is possible to output INTB data on the TS pin. The output is push-pull. No output is
available when on VBAT. When on VBAT the output is Hi-Z.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.12.4.2
TS pin output mode; CLK
It is possible to output a clock frequency on the TS pin. Clock frequency is selected with
the COF[2:0] bits in the Function register (Section 8.13 on page 53). The output is
push-pull. No output is available when on VBAT. When on VBAT the output is Hi-Z.
8.12.4.3
TS pin disabled
When disabled the pin is Hi-Z and can be left floating.
8.12.5 TSIM: TS pin input type control
Table 48.
TSIM bit - Pin_IO control register (address 27h)
Bit
Symbol
4
TSIM
[1]
Value
Description
TS pin input mode
0[1]
CMOS input; reference to VDD; disabled when
on VBAT
1
mechanical switch mode; active pull-up
sampled at 16 Hz; operates on VDD and VBAT
Default value.
In CMOS input mode (TSIM = 0), input is taken directly from the TS pin. The input is
conditioned by the setting of TSL. When operating on the battery voltage (VBAT), the input
is disabled and is allowed to float.
In mechanical switch detector mode (TSIM = 1), the TS pin is sampled at a rate of 16 Hz
for a period of 30.5 s. At the same time as the sample a pull-up resistor is activated to
detect an open pin or a pin shorted to VSS. The input is referenced to the internal power
supply. This mode operates when on VDD or VBAT. The pull-up resistor value can be
controlled by TSPULL bit in the Pin_IO register (see Section 8.12 on page 49).
8.12.5.1
TS pin input mode
There are two input types which are controlled by the TSIM bit. The TS input can be used
to generate a timestamp event by configuring the timestamp mode bits; TSR2M[2:0] and
TSR1M[1:0] bits in TSR_mode register (see Table 20 on page 29).
Also it is possible to use the TS pin to control counting of time. This is typically for use with
the stop-watch mode where an elapsed time counter function can be implemented. Using
the STOPM bit in the Function register (see Table 51 on page 53) it is possible to control
the STOP bit by the TS pin.
8.12.6 INTAPM[1:0]: INTA pin mode control
Table 49.
Bit
Symbol
1 to 0
INTAPM[1:0]
[1]
PCF85363A
Product data sheet
INTAPM[1:0] bits - Pin_IO control register (address 27h)
Value
Description
INTA pin mode
00[1]
CLK output mode
01
battery mode indication
10
INTA output
11
Hi-Z
Default value.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
The INTA pin can be used to output three different signals.
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Fig 28. INTA pin
8.12.6.1
INTAPM[1:0]: INTA
The primary function of the INTA pin is to output INTA data. INTA data is controlled by the
bits of the INTA_enable register (see Table 29 on page 38).
The output is active LOW with an open-drain output. The output is available during VDD
and VBAT operation.
8.12.6.2
INTAPM[1:0]: clock data
It is possible to output a clock frequency on the INTA pin. Clock frequency is selected with
the COF[2:0] bits in the Function register (Section 8.13 on page 53). The output is active
LOW with an open-drain output. The output is available only during VDD operation. The
output is Hi-Z when operating from VBAT.
Remark: Clock output is the default state. To save power, it is recommended to disable
the clock when not being used. If no clock is required, then set COF[2:0] in the Function
register (Section 8.13 on page 53) to CLK disabled. If clock output is only required on the
CLK pin, then set the INTA pin to either INTA data or battery mode.
8.12.6.3
INTAPM[1:0]: battery mode indication
It is possible to output the state of the power switch on the INTA pin. The output has an
open-drain output. The output is available during VDD and VBAT operation.
Table 50.
PCF85363A
Product data sheet
INTA battery mode
Power supply
INTA pin state
VDD
INTA = Hi-Z
VBAT
INTA = logic 0
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PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.13 Function register
Table 51.
Function - chip function control register (address 28h) bit description
Bit
7
6
5
4
3
2
1
Symbol
100TH
PI[1:0]
RTCM
STOPM
COF[2:0]
Section
Section 8.13.1
Section 8.13.2
Section 8.13.3
Section 8.13.4
Section 8.13.5
0
8.13.1 100TH: 100th seconds mode
Table 52.
100TH bit - Function control register (address 28h)
Bit
Symbol
7
100TH
[1]
Value
Description
100th second mode
0[1]
100th second disabled
1
100th second enabled
Default value.
The PCF85363A can be configured to count at a resolution of 1 second or 0.01 seconds.
In 100th mode, the 100th_seconds register becomes available and the RTC counts at a
resolution of 0.01 seconds.
The 256 Hz clock signal is divided by 3 for fourteen 100 Hz periods and then by 2 for
eleven 100 Hz periods. This produces an effective division ratio of 2.56 with a maximum
jitter of 3.91 ms. Over twenty-five 100 Hz cycles the jitter is 0 ns.
8.13.2 PI[1:0]: Periodic interrupt
Table 53.
PI[1:0] bits - Function control register (address 28h)
Bit
Symbol
6 to 5
PI[1:0]
[1]
Value
Description
periodic interrupt
00[1]
no periodic interrupt
01
once per second
10
once per minute
11
once per hour
Default value.
The periodic interrupt mode can be used to enable pre-defined timers for generating
pulses on the interrupt pin. Interrupts once per second, once per minute or once per hour
can be generated.
When disabled, the timers are reset. When enabled, the time to the first pulse is between
the chosen period and the chosen period minus 1 seconds.
The timers are not affected by STOP.
When the periodic interrupt triggers, the PIF (PI flag) in the Flags register (Section 8.14 on
page 56) is set.
The flag does not have to be cleared to allow another INTA or INTB pulse.
The duration of the periodic interrupt is unaffected by offset calibration.
See Section 8.9 “Interrupts” for a description of interrupt pulse control and output pins.
PCF85363A
Product data sheet
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.13.3 RTCM: RTC mode
Table 54.
RTCM bit - Function control register (address 28h)
Bit
Symbol
4
RTCM
[1]
Value
Description
RTC mode
0[1]
real-time clock mode
1
stop-watch mode
Default value.
The RTC mode is used to control how the time is counted. When configured as a classic
RTC, then time is counted from 100th seconds to years. In stop-watch mode, time is
counted from 100th seconds to 999999 hours.
Table 55.
RTC time counting modes
RTCM Mode
Time counting
0
RTC
100th seconds[1], seconds, minutes, hours, days, weekdays, months, years
1
stop-watch 100th seconds[1], seconds, minutes, hours (0 hours to 999999 hours)
[1]
Enabled with 100TH bit in the Function register (Section 8.13 on page 53).
8.13.4 STOPM: STOP mode control
Table 56.
STOPM bit - Function control register (address 28h)
Bit
Symbol
3
STOPM
[1]
Value
Description
STOP mode
0[1]
RTC stop is controlled by STOP bit only
1
RTC stop is controlled by STOP bit or TS pin
Default value.
The STOP register bit in the Oscillator register (Section 8.10 on page 41) is used to stop
the counting of time in both RTC mode and stop-watch mode. Stopping of the oscillator
can also be controlled from the TS pin. The TS pin must first be configured as an input by
the TSPM[1:0] bits, then selected for active HIGH or active LOW by the TSL bits.
Table 57.
Oscillator stop control when STOPM = 1
STOP bit[1]
TSL
TS pin[2]
Oscillator state
Description
0
0
0
running
TS pin active HIGH
1
stopped
0
stopped
1
running
-
stopped
1
1
PCF85363A
Product data sheet
-
[1]
In the Oscillator register (Section 8.10 on page 41).
[2]
TSPM[1:0] = 11.
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TS pin active LOW
TS pin ignored
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.13.5 COF[2:0]: Clock output frequency
Table 58.
Bit
COF[2:0] bits - Function control register (address 28h)
Symbol
Value
Frequency selection (Hz)
COF[2:0]
000[1]
32768
32768
32768
001
16384
16384
16384
010
8192
8192
8192
011
4096
4096
4096
100
2048
2048
2048
101
1024
1024
1024
110
1
1
1
111
static LOW
static LOW
Hi-Z
CLK pin
2 to 0
[1]
TS pin
INTA pin
Default value.
A programmable square wave is available at pin CLK. Operation is controlled by the
COF[2:0] bits. Frequencies of 32.768 kHz (default) down to 1 Hz can be generated for use
as a system clock, microcontroller clock, input to a charge pump, or for calibration of the
oscillator.
Pin CLK is a push-pull output and enabled at power-on. Pin CLK can be disabled by
setting CLKPM = 1 in the Pin_IO register (Section 8.12 on page 49). When disabled, the
CLK pin is LOW.
The selected clock frequency may also be output on the TS pin and the INTA pin. The
CLKIV bit may be used to invert the clock output. CLKIV does not invert for the setting
COF[2:0] = 111.
The duty cycle of the selected clock is not controlled. However, due to the nature of the
clock generation, all clock frequencies except 32.768 kHz have a duty cycle of 50 : 50.
PCF85363A
Product data sheet
Table 59.
Clock duty cycles
COF[2:0]
Frequency (Hz)
Typical duty cycle[1]
000[2]
32768
60 : 40 to 40 : 60
001
16384
50 : 50
010
8192
50 : 50
011
4096
50 : 50
100
2048
50 : 50
101
1024
50 : 50
110
1[3]
50 : 50
111
static
-
[1]
Duty cycle definition: % HIGH-level time : % LOW-level time.
[2]
Default values. The duty cycle of the CLKOUT when outputting 32,768 Hz could change from 60:40 to
40:60 depending on the detector since the 32,768 Hz is derived from the oscillator output which is not
perfect. It could change from device to device and it depends on the silicon diffusion. There is nothing that
can be done from outside the chip to influence the duty cycle.
[3]
1 Hz clock pulses are not affected by offset correction pulses.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.14 Flags register
Table 60.
Bit
Flags - Flag status register (address 2Bh) bit description
Symbol
7
PIF
Flag name
Value
Description
Periodic Interrupt Flag
Section 8.13.2 on page 53
0[1]
read: periodic interrupt flag inactive
write: periodic interrupt flag is cleared
1
read: periodic interrupt flag active
write: periodic interrupt flag remains unchanged
6
A2F
Alarm2 Flag
Section 8.4 on page 18
0[1]
read: alarm2 flag inactive
write: alarm2 flag is cleared
1
read: alarm2 flag active
write: alarm2 flag remains unchanged
5
A1F
Alarm1 Flag
Section 8.4 on page 18
0[1]
read: alarm1 flag inactive
write: alarm1 flag is cleared
1
read: alarm1 flag active
write: alarm1 flag remains unchanged
4
WDF
WatchDog Flag
Section 8.5 on page 25
0[1]
read: WatchDog flag inactive
write: WatchDog flag is cleared
1
read: WatchDog flag active
write: WatchDog flag remains unchanged
3
BSF
Battery Switch Flag
Section 8.11 on page 43
0[1]
read: battery switch flag inactive
write: battery switch flag is cleared
1
read: battery switch flag active
write: battery switch flag remains unchanged
2
TSR3F
Timestamp Register 3
event Flag
Section 8.7 on page 27
0[1]
read: timestamp register 3 flag inactive
write: timestamp register 3 flag is cleared
1
read: timestamp register 3 flag active
write: timestamp register 3 flag remains unchanged
1
TSR2F
Timestamp Register 2
event Flag
Section 8.7 on page 27
0[1]
read: timestamp register 2 flag inactive
write: timestamp register 2 flag is cleared
1
read: timestamp register 2 flag active
write: timestamp register 2 flag remains unchanged
0
TSR1F
Timestamp Register 1
event Flag
Section 8.7 on page 27
0[1]
read: timestamp register 1 flag inactive
write: timestamp register 1 flag is cleared
1
read: timestamp register 1 flag active
write: timestamp register 1 flag remains unchanged
[1]
Default value.
The flags are set by their respective function. A full description can be found there. All
flags behave the same way. They are set by some function of the IC and remain set until
overwritten by command. It is possible to clear flags individually. To prevent one flag being
overwritten while clearing another, a logic AND is performed during a write access. All
flags are combined to generate an event monitoring signal called EMON. EMON is
described in Section 8.2.3 on page 14 and can be read as the MSB of minutes register.
PCF85363A
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.15 Reset register
Table 61.
Reset - software reset control (address 2Fh) bit description
Bit
7
6
5
4
3
2
1
0
Symbol
CPR
0
1
0
SR
1
0
CTS
Section
Section 8.15.2
Section 8.15.1
Section 8.15.3
For a
• software reset (SR), 00101100 (2Ch) must be sent to register Reset (address 2Fh). A
software reset also triggers CPR and CTS
• clear prescaler (CPR), 10100100 (A4h) must be sent to register Reset (address 2Fh)
• clear timestamp (CTS),00100101 (25h) must be sent to register Reset (address 2Fh)
It is possible to combine CPR and CTS by sending 10100101 (A5h).
Remark: Any other value sent to this register is ignored.
8.15.1 SR - Software reset
A reset is automatically generated at power-on. A reset can also be initiated with the
software reset command.
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Fig 29. Software reset command
The PCF85363A resets to:
Mode — real-time clock, 100th second off
Time — 00:00:00.00
Date — 2000.01.01
Weekday — Saturday
Battery switch — on, switching on the lower threshold voltage
Oscillator — CL = 7 pF
Pins — INTA = 32 kHz output, CLK = 32 kHz output, TS = disabled
In the reset state, all registers are set according to Table 62.
PCF85363A
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NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Table 62. Registers reset values
Registers labeled as - remain unchanged.
Address
Register name
Bit
7
6
5
4
3
2
1
0
00h
100TH_seconds
0
0
0
0
0
0
0
0
01h
Seconds
1
0
0
0
0
0
0
0
02h
Minutes
0
0
0
0
0
0
0
0
03h
Hours
0
0
0
0
0
0
0
0
04h
Days
0
0
0
0
0
0
0
1
05h
Weekdays
0
0
0
0
0
1
1
0
06h
Months
0
0
0
0
0
0
0
1
07h
Years
0
0
0
0
0
0
0
0
08h
Second_alarm1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Second_alm1
09h
Minute_alarm1
0Ah
Hour_alarm1
Minute_alm1
Hr_xx_xx_00_alm1
0Bh
Day_alarm1
Hr_xx_00_xx_alm1
0Ch
Month_alarm1
Hr_00_xx_xx_alm1
0Dh
Minute_alarm2
0Eh
Hour_alarm2
Minute_alm2
Hr_xx_00_alm2
0Fh
Weekday_alarm2
10h
Alarm enables
0
0
0
0
0
0
0
0
11h to 16h
Timestamp 1
0
0
0
0
0
0
0
0
17h to 1Ch Timestamp 2
0
0
0
0
0
0
0
0
Hr_00_xx_alm2
PCF85363A
Product data sheet
1Dh to 22h Timestamp 3
0
0
0
0
0
0
0
0
23h
Timestamp_mode
0
0
0
0
0
0
0
0
24h
Offset
0
0
0
0
0
0
0
0
25h
Oscillator
0
0
0
0
0
0
0
0
26h
Battery_switch
0
0
0
0
0
0
0
0
27h
Pin_IO
0
0
0
0
0
0
0
0
28h
Function
0
0
0
0
0
0
0
0
29h
INTA_enable
0
0
0
0
0
0
0
0
2Ah
INTB_enable
0
0
0
0
0
0
0
0
2Bh
Flags
0
0
0
0
0
0
0
0
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Table 62. Registers reset values …continued
Registers labeled as - remain unchanged.
Address
Register name
Bit
7
6
5
4
3
2
1
0
2Ch
RAM_byte
0
0
0
0
0
0
0
0
2Dh
WatchDog
0
0
0
0
0
0
0
0
2Fh
Reset
0
0
0
0
0
0
0
0
8.15.2 CPR: clear prescaler
To set the time for RTC mode accurately or to clear the time in stop-watch mode, the clear
prescaler instruction is needed.
Before sending this instruction, it is recommended to first set stop either by the STOP bit
or by the TS pin (see STOPM bit).
See STOP definition for an explanation on using this instruction.
8.15.3 CTS: clear timestamp
The timestamp registers (address 11h to 22h) can be set to all 0 with this instruction.
8.16 Stop_enable register
Table 63.
Stop_enable - control of STOP bit (address 2Eh)
Bit
Symbol
Value
Description
7 to 1
-
0000000
not used
0
STOP
[1]
STOP bit
0[1]
RTC clock runs
1
RTC clock is stopped
Default value.
The STOP bit stops the time from counting in both RTC mode and stop-watch mode. For
RTC mode STOP is useful to set the time accurately. For stop-watch mode it is the
start/stop control for the watch.
The counter can also be controlled from the TS pin by configuring STOPM in the Function
register (Section 8.13 on page 53). The internal stop signal is a combination of STOP and
the TS pin state.
Table 64.
PCF85363A
Product data sheet
Counter stop signal
STOP bit
TS pin[1][2]
stop signal
Counter
1
-
1
stopped
-
1
1
stopped
0
0
0
running
[1]
Requires STOPM and TSPM[1:0] to be configured.
[2]
TSL = 0 (active HIGH) (Pin_IO register, address 27h).
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
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(1) stop is a combination of STOP register bit and the TS pin when programmed for stop control.
Fig 30. CPR and STOP bit functional diagram
The stop signal blocks the 8.192 kHz clock from generating system clocks and freezes the
time. In this state, the prescaler can be cleared with the CPR command in the Resets
register (Section 8.15 on page 57).
Remark: The output of clock frequencies is not affected.
The time circuits can then be set and do not increment until the STOP bit is released.
The stop acts on the 8.192 kHz signal. And because the I2C-bus or TS pin input is
asynchronous to the crystal oscillator, the accuracy of restarting the time circuits is
between zero and one 8.192 kHz cycle (see Figure 31).
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Fig 31. STOP release timing
The first increment of the time circuits is between 0 s and 122 s after STOP is released.
The flow for accurately setting the time in RTC mode is:
•
•
•
•
•
•
•
•
•
PCF85363A
Product data sheet
start an I2C access at register 2Eh
set STOP bit
send CPR instruction
address counter rolls over to address 00h
set time (100th seconds, seconds to years)
end I2C access
wait for external time reference to indicate that time counting should start
start an I2C access at register 2Eh
clear STOP bit (time starts counting from now)
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
• end I2C access
The flow for resetting time in stop-watch mode is:
•
•
•
•
•
•
start an I2C access at register 2Eh
set STOP bit
send CPR instruction
address counter will roll over to address 00h
set time to 000000:00:00.00
end I2C access
8.17 64 byte RAM
In addition to the single RAM byte, there is a 64 byte RAM available from address 40h to
7Fh. The RAM can be written and read when the device is powered from VDD. The RAM
content is backed-up when the device is powered from VBAT, but cannot be accessed as
the interface is disabled.
The address pointer is set during interface initiation and will auto increment after each
byte access. The pointer will wrap around from address 7Fh to 40h after the last byte is
accessed, (see Figure 5).
PCF85363A
Product data sheet
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
9. I2C-bus interface
The I2C-bus is for bidirectional, two-line communication between different ICs. The two
lines are a Serial DAta line (SDA) and a Serial CLock line (SCL). Both lines must be
connected to a positive supply via a pull-up resistor. Data transfer may be initiated only
when the bus is not busy. Both data and clock lines remain HIGH when the bus is not
busy. The PCF85363A acts as a slave receiver when being written to and as a slave
transmitter when being read from.
Remark: When on VBAT power, the interface is not accessible.
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Fig 32. I2C read and write protocol
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Fig 33. I2C read and write signaling
9.1 Bit transfer
One data bit is transferred during each clock pulse. The data on the SDA line must remain
stable during the HIGH period of the clock pulse, as changes in the data line at this time
are interpreted as STOP or START conditions.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
9.2 START and STOP conditions
A HIGH-to-LOW transition of the data line while the clock is HIGH is defined as the START
condition - S.
A LOW-to-HIGH transition of the data line while the clock is HIGH is defined as the STOP
condition - P (see Figure 33).
9.3 Acknowledge
Each byte of 8 bits is followed by an acknowledge cycle. An acknowledge is defined as
logic 0. A not-acknowledge is defined as logic 1.
When written to, the slave will generate an acknowledge after the reception of each byte.
After the acknowledge, another byte may be transmitted. It is also possible to send a
STOP or START condition.
When read from, the master receiver must generate an acknowledge after the reception
of each byte. When the master receiver no longer requires bytes to be transmitter, it must
generate a not-acknowledge. After the not-acknowledge, either a STOP or START
condition must be sent.
A detailed description of the I2C-bus specification is given in Ref. 10 “UM10204”.
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
10. Interface protocol
The PCF85363A uses the I2C interface for data transfer. Interpretation of the data is
determined by the interface protocol.
10.1 Write protocol
After the I2C slave address is transmitted, the PCF85363A requires that the register
address pointer is defined. It can take the value 00h to 2Fh. Values outside of that range
will result in the transfer being ignored, however the slave will still respond with
acknowledge pulses.
After the register address is transmitted, write data is transmitted. The minimum number
of data write bytes is 0 and the maximum number is unlimited. After each write, the
address pointer increments by one. After address 2Fh, the address pointer will roll over to
00h.
•
•
•
•
•
•
•
•
I2C START condition
I2C slave address + write
register address
write data
write data
:
write data
I2C STOP condition; an I2C RE-START condition is also possible.
10.2 Read protocol
When reading the PCF85363A, reading starts at the current position of the address
pointer. The address pointer for read data should first be defined by a write sequence.
•
•
•
•
I2C START condition
I2C slave address + write
register address
I2C STOP condition; an I2C RE-START condition is also possible.
After setting the address pointer, a read can be executed. After the I2C slave address is
transmitted, the PCF85363A will immediately output read data. After each read, the
address pointer increments by one. After address 2Fh, the address pointer will roll over to
00h.
•
•
•
•
•
•
•
PCF85363A
Product data sheet
I2C START condition
I2C slave address + read
read data (master sends acknowledge bit)
read data (master sends acknowledge bit)
:
read data (master sends not-acknowledge bit)
I2C STOP condition. An I2C RE-START condition is also possible.
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PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
The master must indicate that the last byte has been read by generating a
not-acknowledge after the last read byte.
10.3 Slave addressing
10.3.1 Slave address
One I2C-bus slave address (1010 001) is reserved for the PCF85363A. The entire I2C-bus
slave address byte is shown in Table 65.
Table 65.
I2C slave address byte
Slave address
Bit
7
6
5
4
3
2
1
MSB
1
0
LSB
0
1
0
0
0
1
R/W
After a START condition, the I2C slave address has to be sent to the PCF85363A device.
Slave address can also be written in a hexadecimal format:
• A2h - Write slave address
• A3h - Read slave address
PCF85363A
Product data sheet
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PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
11. Application design-in information
In this application, stop-watch mode is used to implement an elapsed time counter. The
TS pin is used with a mechanical switch to start and stop the time. Each time the time is
stopped, timestamp2 is loaded with the current time and an interrupt is generated on the
INTA pin.
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Fig 34. Application example
The RTC must be configured correctly for this mode of operation. Outlined in Table 66 are
the settings needed for this mode.
In addition, the time must be set and any other configurations like battery switch-over,
quartz oscillator driving mode, etc., which are dependent on the application.
The sampler circuit shown in Figure 34 will hold invalid data until the mechanical switch
detector mode is enabled. It then requires a minimum of one sample period to initialize to
the current TS pin level. It is recommended to enable the mechanical detector mode on
the TS pin at least 62.5 ms before enabling the TS event mode. Failure to do so can result
in a false first event.
PCF85363A
Product data sheet
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PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Table 66.
Application configuration
Register
Section
Bit(s)
State
Comment
Pin_IO
Section 8.12
TSPM[1:0]
11
TS pin in input mode
Pin_IO
Section 8.12
TSIM
1
select mechanical switch mode
Pin_IO
Section 8.12
TSL
1
TS pin input is active LOW
Function
Section 8.13
STOPM
1
allow TS pin to control STOP
TSRIEA
1
allow timestamps to create interrupts
ILPA
0
generate interrupt pulses
TSR_mode Section 8.12
TSR2M[2:0]
101
last event mode for timestamp2
Pin_IO
INTAPM[1:0]
10
output interrupt on INTA
Section 8.12
Figure 35 shows the waveforms that can be expected. sample clock, vdd_int and stop are
internal nodes. vdd_int is supply which operates the IC and will be either VDD or VBAT,
depending on the state of the battery switch-over.
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Fig 35. Application example timing
• At and before t1, SW1 is open (TS pin floating). The TS pin is sampled and the
internal pull-up resistor will pull the pin HIGH to vdd_int. No actions are taken by the
IC.
• At t2, SW1 is still open. No action is taken by the IC.
• At t3, SW1 closes. The TS pin is now shorted to VSS. The TS pin has not been
sampled yet, so no action is taken by the IC.
• At t4, SW1 is closed. The internal pull-up resistor is enabled, but TS pin remains
LOW. The pin is then sampled and the LOW level detected. As the TSL bit was set for
active LOW detection, the HIGH-LOW transition of TS pin sampled triggers an event.
STOPM mode was configured to allow the TS pin to stop the time counting. As the
TSL bit was set for active LOW, time counting stops when the TS pin is LOW.
Timestamp register 2 was configured to take a copy of the time on an event of the TS
pin, hence TSR2 loads the time t4. TSR2F is also set.
PCF85363A
Product data sheet
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67 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
INTA was configured to generate an interrupt when TSR2 loads a new time, hence an
interrupt pulse is seen on INTA.
• At t5, SW1 is opened. No action is taken by the IC.
• At t6, SW1 is open. The internal pull-up is active and the TS pin raises to vdd_int
level. The HIGH level is sampled and causes the stop signal to be released and time
starts counting again.
12. Internal circuitry
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Fig 36. Device diode protection diagram of PCF85363A
13. Safety notes
CAUTION
This device is sensitive to ElectroStatic Discharge (ESD). Observe precautions for handling
electrostatic sensitive devices.
Such precautions are described in the ANSI/ESD S20.20, IEC/ST 61340-5, JESD625-A or
equivalent standards.
PCF85363A
Product data sheet
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Rev. 3 — 18 November 2015
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68 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
14. Limiting values
Table 67. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
VDD
Min
Max
Unit
supply voltage
0.5
+6.5
V
IDD
supply current
50
+50
mA
VBAT
battery supply voltage
0.5
+6.5
V
IBAT
battery supply current
50
+50
mA
VI
input voltage
0.5
+6.5
V
VO
output voltage
0.5
+6.5
V
II
input current
at any input
10
+10
mA
IO
output current
at any output
10
+10
mA
Ptot
total power dissipation
-
300
mW
-
3500
V
PCF85363ATL
-
1750
V
PCF85363ATT
-
1000
V
VESD
electrostatic
discharge voltage
Conditions
on pins SCL, SDA, OSCI, TS
HBM
[1]
CDM
[2]
-
2000
V
Ilu
latch-up current
[3]
-
200
mA
Tstg
storage temperature
[4]
65
+150
C
Tamb
ambient temperature
40
+85
C
PCF85363ATT1
operating device
[1]
Pass level; Human Body Model (HBM) according to Ref. 6 “JESD22-A114”.
[2]
Pass level; Charged-Device Model (CDM), according to Ref. 7 “JESD22-C101”.
[3]
Pass level; latch-up testing, according to Ref. 8 “JESD78” at maximum ambient temperature (Tamb(max)).
[4]
According to the store and transport requirements (see Ref. 11 “UM10569”) the devices have to be stored at a temperature of +8 C to
+45 C and a humidity of 25 % to 75 %.
PCF85363A
Product data sheet
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Rev. 3 — 18 November 2015
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PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
15. Characteristics
Table 68. Static characteristics
VDD = 0.9 V to 5.5 V; VSS = 0 V; Tamb = 40 C to +85 C; fosc = 32.768 kHz; quartz Rs = 60 k; CL = 7 pF; all registers in
reset state; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
supply voltage
interface inactive; fSCL = 0 Hz
[1]
0.9
-
5.5
V
[2]
interface active; fSCL = 400 kHz
1.8
-
5.5
V
battery supply voltage
[1]
0.9
-
5.5
V
supply current
[3]
Tamb = 25 C
-
320
480
nA
Tamb = 50 C
-
370
550
nA
-
590
885
nA
Tamb = 25 C
-
280
420
nA
Tamb = 50 C
-
330
500
nA
Tamb = 85 C
-
550
825
nA
-
10
-
A
Supplies
VDD
VBAT
IDD
CLKOUT disabled;
VDD = 3.3 V;
interface inactive; fSCL = 0 Hz
battery switch enabled
Tamb = 85 C
battery switch disabled
[4]
CLKOUT disabled;
VDD = 3.3 V;
interface active;
fSCL = 400 kHz
Reference voltage
Vth
threshold voltage
HIGH falling VDD
2.4
2.6
2.8
V
HIGH rising VDD
2.5
2.7
2.95
V
LOW falling VDD
1.3
1.4
1.5
V
LOW rising VDD
1.37
1.47
1.6
V
reference voltage hysteresis
-
50
-
mV
Inputs[5]
VI
input voltage
0.5
-
+5.5
V
VIL
LOW-level input
voltage
0.5
-
+0.3VDD
V
VIH
HIGH-level input
voltage
0.7VDD
-
5.5
V
ILI
input leakage current
-
0
-
A
0.5
-
+0.5
A
Ci
input capacitance
-
-
7
pF
RPU(TS)
pull-up resistance on
pin TS
80 k mode
68
80
92
k
40 k mode
36
40
64
k
VI = VSS or VDD
post ESD event
PCF85363A
Product data sheet
[6]
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PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Table 68. Static characteristics …continued
VDD = 0.9 V to 5.5 V; VSS = 0 V; Tamb = 40 C to +85 C; fosc = 32.768 kHz; quartz Rs = 60 k; CL = 7 pF; all registers in
reset state; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VOH
HIGH-level output
voltage
on pin CLK, TS
0.8VDD
-
VDD
V
VOL
LOW-level output
voltage
on pins SDA, INTA, CLK, TS
VSS
-
0.2VDD
V
IOH
HIGH-level output
current
output source current;
VOH = 2.9 V;
VDD = 3.3 V;
on pin CLK, TS
1
3
-
mA
IOL
LOW-level output
current
output sink current; VOL = 0.4 V;
VDD = 3.3 V
on pin SDA
3
8.5
-
mA
on pin INTA
2
6
-
mA
on pin CLK
1
3
-
mA
on pin TS
1
3
-
mA
Outputs
Oscillator
fosc/fosc
relative oscillator
frequency variation
VDD = 200 mV; Tamb = 25 C
-
0.075
-
ppm
tjit
jitter time
LOWJ = 0
-
50
-
ns
-
25
-
ns
CL = 6 pF
4.8
6
7.2
pF
CL = 7 pF
5.6
7
8.4
pF
CL = 12.5 pF
10
12.5
15
pF
-
-
100
k
LOWJ = 1
CL(itg)
integrated load
capacitance
series resistance
Rs
on pins OSCO, OSCI;
VDD = 3.3 V
[7]
normal mode
[1]
For reliable oscillator start-up at power-on use VDD greater than 1.2 V. If powered up at 0.9 V the oscillator will start but it might be a bit
slow, especially if at high temperature. Normally the power supply is not 0.9 V at start-up and only comes at the end of battery
discharge. VDD min of 0.9 V is specified so that the customer can calculate how large a battery or capacitor they need for their
application. VDD min of 1.2 V or greater is needed to ensure speedy oscillator start-up time.
[2]
400 kHz I2C operation is production tested at 1.8 V. Design methodology allows I2C operation at 1.8 V 5 % (1.71 V) which has been
verified during product characterization on a limited number of devices.
[3]
Measured after reset and CLK disabled, level of inputs is VDD or VSS.
[4]
Measured after reset, CLK disabled, battery switch disabled and level of inputs is VDD or VSS.
[5]
The I2C-bus interface of PCF85363A is 5 V tolerant.
[6]
Implicit by design.
[7]
Integrated load capacitance, CL(itg), is a calculation of COSCI and COSCO in series: C L itg = -------------------------------------------- .
C OSCI + C OSCO
PCF85363A
Product data sheet
C OSCI C OSCO
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PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
DDD
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Tamb = 25 C; CLKOUT disabled.
(1) VDD = 5.0 V.
(2) VDD = 3.3 V.
Fig 37. Typical IDD with respect to fSCL
DDD
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CL(itg) = 7 pF; CLKOUT disabled; battery switched on.
(1) VDD = 5 V.
(2) VDD = 3.3 V.
Fig 38. Typical IDD as a function of temperature
PCF85363A
Product data sheet
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PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
DDD
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Tamb = 25 C; fCLKOUT = 32768 Hz.
(1) 47 pF CLKOUT load.
(2) 22 pF CLKOUT load.
(3) 0 pF CLKOUT load.
DDD
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(1) CL(itg) = 12.5 pF.
(2) CL(itg) = 7 pF.
(3) CL(itg) = 6 pF.
Fig 39. Typical IDD with respect to VDD
PCF85363A
Product data sheet
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PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
DDD
ǻIRVFIRVF
SSP
9''9
Tamb = 25 C.
(1) CL(itg) = 12.5 pF.
(2) CL(itg) = 6 pF.
(3) CL(itg) = 7 pF.
Fig 40. Oscillator frequency variation with respect to VDD
PCF85363A
Product data sheet
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Rev. 3 — 18 November 2015
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74 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Table 69. I2C-bus characteristics
VDD = 1.8 V to 5.5 V; VSS = 0 V; Tamb = 40 C to +85 C; fosc = 32.768 kHz; quartz Rs = 60 k; CL = 7 pF; unless otherwise
specified. All timing values are valid within the operating supply voltage and temperature range and referenced to VIL and VIH
with an input voltage swing of VSS to VDD[1].
Symbol
Parameter
Cb
capacitive load for
each bus line
fSCL
SCL clock frequency
tHD;STA
hold time (repeated)
START condition
tSU;STA
Conditions
Min
Max
Unit
-
400
pF
0
400
kHz
0.6
-
s
set-up time for a
repeated START
condition
0.6
-
s
tLOW
LOW period of the
SCL clock
1.3
-
s
tHIGH
HIGH period of the
SCL clock
0.6
-
s
tr
rise time of both SDA
and SCL signals
20
300
ns
tf
fall time of both SDA
and SCL signals
20 (VDD / 5.5 V) 300
ns
tBUF
bus free time between
a STOP and START
condition
1.3
-
s
tSU;DAT
data set-up time
100
-
ns
tHD;DAT
data hold time
0
-
ns
tSU;STO
set-up time for STOP
condition
0.6
-
s
tVD;DAT
data valid time
0
0.9
s
tVD;ACK
data valid
acknowledge time
0
0.9
s
tSP
pulse width of spikes
that must be
suppressed by the
input filter
0
50
ns
[2]
[3][4]
[1]
A detailed description of the I2C-bus specification is given in Ref. 10 “UM10204”.
[2]
I2C-bus access time between two STARTs or between a START and a STOP condition to this device must be less than one second.
[3]
A device must internally provide a hold time of at least 300 ns for the SDA signal (with respect to the VIH(min) of the SCL signal) to bridge
the undefined region of the falling edge of SCL.
[4]
The maximum tf for the SDA and SCL bus lines is specified at 300 ns. The maximum fall time for the SDA output stage tf is specified at
250 ns. This allows series protection resistors to be connected in between the SDA and the SCL pins and the SDA/SCL bus lines
without exceeding the maximum specified tf.
PCF85363A
Product data sheet
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Rev. 3 — 18 November 2015
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75 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
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16. Application information
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The data sheet values were obtained using a crystal with an ESR of 60 k. If a crystal with
an ESR of 70 k is used then the power consumption would increase by a few nA and the
start-up time will increase slightly.
PCF85363A
Product data sheet
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Rev. 3 — 18 November 2015
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76 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
17. Test information
17.1 Quality information
UL Component Recognition
This (component or material) is Recognized by UL. Representative samples of this
component have been evaluated by UL and meet applicable UL requirements.
PCF85363A
Product data sheet
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Rev. 3 — 18 November 2015
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77 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
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Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 18 November 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
78 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
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PCF85363A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 18 November 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
79 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
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PCF85363A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 18 November 2015
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
19. Handling information
All input and output pins are protected against ElectroStatic Discharge (ESD) under
normal handling. When handling Metal-Oxide Semiconductor (MOS) devices ensure that
all normal precautions are taken as described in JESD625-A, IEC 61340-5 or equivalent
standards.
20. Packing information
For tape and reel packing information, please see
• Ref. 12 “SOT505-1_118” on page 88
• Ref. 13 “SOT552-1_118” on page 88
• Ref. 14 “SOT1197-1_115” on page 88
21. Soldering of SMD packages
This text provides a very brief insight into a complex technology. A more in-depth account
of soldering ICs can be found in Application Note AN10365 “Surface mount reflow
soldering description”.
21.1 Introduction to soldering
Soldering is one of the most common methods through which packages are attached to
Printed Circuit Boards (PCBs), to form electrical circuits. The soldered joint provides both
the mechanical and the electrical connection. There is no single soldering method that is
ideal for all IC packages. Wave soldering is often preferred when through-hole and
Surface Mount Devices (SMDs) are mixed on one printed wiring board; however, it is not
suitable for fine pitch SMDs. Reflow soldering is ideal for the small pitches and high
densities that come with increased miniaturization.
21.2 Wave and reflow soldering
Wave soldering is a joining technology in which the joints are made by solder coming from
a standing wave of liquid solder. The wave soldering process is suitable for the following:
• Through-hole components
• Leaded or leadless SMDs, which are glued to the surface of the printed circuit board
Not all SMDs can be wave soldered. Packages with solder balls, and some leadless
packages which have solder lands underneath the body, cannot be wave soldered. Also,
leaded SMDs with leads having a pitch smaller than ~0.6 mm cannot be wave soldered,
due to an increased probability of bridging.
The reflow soldering process involves applying solder paste to a board, followed by
component placement and exposure to a temperature profile. Leaded packages,
packages with solder balls, and leadless packages are all reflow solderable.
Key characteristics in both wave and reflow soldering are:
• Board specifications, including the board finish, solder masks and vias
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
•
•
•
•
•
Package footprints, including solder thieves and orientation
The moisture sensitivity level of the packages
Package placement
Inspection and repair
Lead-free soldering versus SnPb soldering
21.3 Wave soldering
Key characteristics in wave soldering are:
• Process issues, such as application of adhesive and flux, clinching of leads, board
transport, the solder wave parameters, and the time during which components are
exposed to the wave
• Solder bath specifications, including temperature and impurities
21.4 Reflow soldering
Key characteristics in reflow soldering are:
• Lead-free versus SnPb soldering; note that a lead-free reflow process usually leads to
higher minimum peak temperatures (see Figure 46) than a SnPb process, thus
reducing the process window
• Solder paste printing issues including smearing, release, and adjusting the process
window for a mix of large and small components on one board
• Reflow temperature profile; this profile includes preheat, reflow (in which the board is
heated to the peak temperature) and cooling down. It is imperative that the peak
temperature is high enough for the solder to make reliable solder joints (a solder paste
characteristic). In addition, the peak temperature must be low enough that the
packages and/or boards are not damaged. The peak temperature of the package
depends on package thickness and volume and is classified in accordance with
Table 70 and 71
Table 70.
SnPb eutectic process (from J-STD-020D)
Package thickness (mm)
Package reflow temperature (C)
Volume (mm3)
< 350
350
< 2.5
235
220
2.5
220
220
Table 71.
Lead-free process (from J-STD-020D)
Package thickness (mm)
Package reflow temperature (C)
Volume (mm3)
< 350
350 to 2000
> 2000
< 1.6
260
260
260
1.6 to 2.5
260
250
245
> 2.5
250
245
245
Moisture sensitivity precautions, as indicated on the packing, must be respected at all
times.
PCF85363A
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Studies have shown that small packages reach higher temperatures during reflow
soldering, see Figure 46.
maximum peak temperature
= MSL limit, damage level
temperature
minimum peak temperature
= minimum soldering temperature
peak
temperature
time
001aac844
MSL: Moisture Sensitivity Level
Fig 46. Temperature profiles for large and small components
For further information on temperature profiles, refer to Application Note AN10365
“Surface mount reflow soldering description”.
22. Footprint information
VROGHUODQGV
RFFXSLHGDUHD
'LPHQVLRQVLQPP
VRWBIU
Fig 47. Footprint information for reflow soldering of SOT505-1 (TSSOP8), PCF85363ATT
PCF85363A
Product data sheet
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Rev. 3 — 18 November 2015
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83 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
)RRWSULQWLQIRUPDWLRQIRUUHIORZVROGHULQJRI')1SDFNDJH
627
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63\
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6/[
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VROGHUODQG
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VROGHUODQGSOXVVROGHUSDVWH
RFFXSLHGDUHD
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3
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,VVXHGDWH
%\
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6/[
6/\
63[
63\
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VRWBIU
Fig 48. Footprint information for reflow soldering of SOT1197-1 (DFN2626-10),PCF85363ATL
PCF85363A
Product data sheet
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Rev. 3 — 18 November 2015
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84 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
627
)RRWSULQWLQIRUPDWLRQIRUUHIORZVROGHULQJRI76623SDFNDJH
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Fig 49. Footprint information for reflow soldering of SOT552-1 (TSSOP10), PCF85363ATT1
PCF85363A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 18 November 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
85 of 95
xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx x x x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xx xx xxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx x x
xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx
NXP Semiconductors
PCF85363A
Product data sheet
23. Appendix
23.1 Real-Time Clock selection
Table 72.
Selection of Real-Time Clocks
Type name
Alarm, Timer, Interrupt Interface IDD,
Battery Timestamp,
Watchdog
output
typical (nA) backup tamper input
AEC-Q100
compliant
Special features
Packages
PCF8563
X
1
I2C
250
-
-
-
-
SO8, TSSOP8,
HVSON10
PCF8564A
X
1
I2C
250
-
-
-
integrated oscillator caps
WLCSP
600
-
-
grade 1
high robustness,
Tamb40 C to 125 C
TSSOP8, HVSON10
X
1
PCA8565A
X
1
I2C
600
-
-
-
integrated oscillator caps,
Tamb40 C to 125 C
WLCSP
PCF85063
-
1
I2C
220
-
-
-
basic functions only, no
alarm
HXSON8
PCF85063A
X
1
I2C
220
-
-
-
tiny package
SO8, DFN2626-10
PCF85063B
X
1
SPI
220
-
-
-
tiny package
DFN2626-10
230
X
X
-
time stamp, battery
backup, stopwatch 1⁄100 s
SO8, TSSOP10,
TSSOP8,
DFN2626-10
X
2
PCF85263B
X
2
SPI
230
X
X
-
time stamp, battery
backup, stopwatch 1⁄100s
TSSOP10,
DFN2626-10
PCF85363A
X
2
I2C
230
X
X
-
time stamp, battery
backup, stopwatch 1⁄100s,
64 Byte RAM
TSSOP10,
DFN2626-10
PCF85363B
X
2
SPI
230
X
X
-
time stamp, battery
backup, stopwatch 1⁄100s,
64 Byte RAM
TSSOP10,
DFN2626-10
PCF8523
X
2
I2C
150
X
-
-
lowest power 150 nA in
operation, FM+ 1 MHz
SO8, HVSON8,
TSSOP14, WLCSP
PCF2123
X
1
SPI
100
-
-
-
lowest power 100 nA in
operation
TSSOP14, HVQFN16
PCF2127
X
1
I2C and
SPI
500
X
X
-
temperature
SO16
compensated, quartz built
in, calibrated, 512 Byte
RAM
PCF85363A
86 of 95
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I2C
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Rev. 3 — 18 November 2015
All information provided in this document is subject to legal disclaimers.
PCA8565
I2C
xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx x x x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xx xx xxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx x x
xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx
Selection of Real-Time Clocks …continued
Alarm, Timer, Interrupt Interface IDD,
Battery Timestamp,
Watchdog
output
typical (nA) backup tamper input
AEC-Q100
compliant
Special features
PCF2127A
X
1
I2C and
SPI
500
X
PCF2129
X
1
I2C and
SPI
500
PCF2129A
X
1
I2C and
SPI
PCA2129
X
1
PCA21125
X
1
Packages
X
-
temperature
SO20
compensated, quartz built
in, calibrated, 512 Byte
RAM
X
X
-
temperature
SO16
compensated, quartz built
in, calibrated
500
X
X
-
temperature
SO20
compensated, quartz built
in, calibrated
I2C and
SPI
500
X
X
grade 3
temperature
SO16
compensated, quartz built
in, calibrated
SPI
820
-
-
grade 1
high robustness,
Tamb40 C to 125 C
TSSOP14
PCF85363A
87 of 95
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Type name
NXP Semiconductors
PCF85363A
Product data sheet
Table 72.
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
24. Abbreviations
Table 73.
Acronym
Abbreviations
Description
BCD
Binary Coded Decimal
CMOS
Complementary Metal Oxide Semiconductor
ESD
ElectroStatic Discharge
HBM
Human Body Model
I2C
Inter-Integrated Circuit
IC
Integrated Circuit
LSB
Least Significant Bit
MSB
Most Significant Bit
MSL
Moisture Sensitivity Level
PCB
Printed-Circuit Board
POR
Power-On Reset
RTC
Real-Time Clock
SCL
Serial CLock line
SDA
Serial DAta line
SMD
Surface Mount Device
25. References
[1]
AN10365 — Surface mount reflow soldering description
[2]
AN10366 — HVQFN application information
[3]
IEC 60134 — Rating systems for electronic tubes and valves and analogous
semiconductor devices
[4]
IEC 61340-5 — Protection of electronic devices from electrostatic phenomena
[5]
IPC/JEDEC J-STD-020 — Moisture/Reflow Sensitivity Classification for
Nonhermetic Solid State Surface Mount Devices
[6]
JESD22-A114 — Electrostatic Discharge (ESD) Sensitivity Testing Human Body
Model (HBM)
[7]
JESD22-C101 — Field-Induced Charged-Device Model Test Method for
Electrostatic-Discharge-Withstand Thresholds of Microelectronic Components
[8]
JESD78 — IC Latch-Up Test
[9]
JESD625-A — Requirements for Handling Electrostatic-Discharge-Sensitive
(ESDS) Devices
[10] UM10204 — I2C-bus specification and user manual
[11] UM10569 — Store and transport requirements
[12] SOT505-1_118 — TSSOP8; Reel pack; SMD, 13", packing information
[13] SOT552-1_118 — TSSOP10; Reel pack; SMD, 13", packing information
[14] SOT1197-1_115 — DFN2626-10; Reel pack; SMD, 7", packing information
PCF85363A
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
26. Revision history
Table 74.
Revision history
Document ID
Release date
Data sheet status
Change notice
Supersedes
PCF85363A v.3
20151118
Product data sheet
-
PCF85363A v.2
Modifications:
•
•
•
Updated Table 4 “Pin description” Table note 3
Updated Table 59 “Clock duty cycles” Table note 2
Table 68 “Static characteristics”:
– Corrected VI min from VSS to 0.5 V
– Corrected VIL min from VSS to 0.5 V
– Corrected VIH max from VDD to 5.5 V
– Corrected Table note 1
– Added Table note 2
•
PCF85363A v.2
Modifications:
PCF85363A v.1
PCF85363A
Product data sheet
Added text to Section 16 “Application information”
20150115
•
•
Product data sheet
-
PCF85363A v.1
-
-
Corrected Figure 34
Corrected Vth values in Table 68
20140710
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
27. Legal information
27.1 Data sheet status
Document status[1][2]
Product status[3]
Definition
Objective [short] data sheet
Development
This document contains data from the objective specification for product development.
Preliminary [short] data sheet
Qualification
This document contains data from the preliminary specification.
Product [short] data sheet
Production
This document contains the product specification.
[1]
Please consult the most recently issued document before initiating or completing a design.
[2]
The term ‘short data sheet’ is explained in section “Definitions”.
[3]
The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nxp.com.
27.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liability for the consequences of
use of such information.
Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and title. A short data sheet is intended
for quick reference only and should not be relied upon to contain detailed and
full information. For detailed and full information see the relevant full data
sheet, which is available on request via the local NXP Semiconductors sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall prevail.
Product specification — The information and data provided in a Product
data sheet shall define the specification of the product as agreed between
NXP Semiconductors and its customer, unless NXP Semiconductors and
customer have explicitly agreed otherwise in writing. In no event however,
shall an agreement be valid in which the NXP Semiconductors product is
deemed to offer functions and qualities beyond those described in the
Product data sheet.
27.3 Disclaimers
Limited warranty and liability — Information in this document is believed to
be accurate and reliable. However, NXP Semiconductors does not give any
representations or warranties, expressed or implied, as to the accuracy or
completeness of such information and shall have no liability for the
consequences of use of such information. NXP Semiconductors takes no
responsibility for the content in this document if provided by an information
source outside of NXP Semiconductors.
In no event shall NXP Semiconductors be liable for any indirect, incidental,
punitive, special or consequential damages (including - without limitation - lost
profits, lost savings, business interruption, costs related to the removal or
replacement of any products or rework charges) whether or not such
damages are based on tort (including negligence), warranty, breach of
contract or any other legal theory.
Notwithstanding any damages that customer might incur for any reason
whatsoever, NXP Semiconductors’ aggregate and cumulative liability towards
customer for the products described herein shall be limited in accordance
with the Terms and conditions of commercial sale of NXP Semiconductors.
Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all information supplied prior
to the publication hereof.
PCF85363A
Product data sheet
Suitability for use — NXP Semiconductors products are not designed,
authorized or warranted to be suitable for use in life support, life-critical or
safety-critical systems or equipment, nor in applications where failure or
malfunction of an NXP Semiconductors product can reasonably be expected
to result in personal injury, death or severe property or environmental
damage. NXP Semiconductors and its suppliers accept no liability for
inclusion and/or use of NXP Semiconductors products in such equipment or
applications and therefore such inclusion and/or use is at the customer’s own
risk.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Customers are responsible for the design and operation of their applications
and products using NXP Semiconductors products, and NXP Semiconductors
accepts no liability for any assistance with applications or customer product
design. It is customer’s sole responsibility to determine whether the NXP
Semiconductors product is suitable and fit for the customer’s applications and
products planned, as well as for the planned application and use of
customer’s third party customer(s). Customers should provide appropriate
design and operating safeguards to minimize the risks associated with their
applications and products.
NXP Semiconductors does not accept any liability related to any default,
damage, costs or problem which is based on any weakness or default in the
customer’s applications or products, or the application or use by customer’s
third party customer(s). Customer is responsible for doing all necessary
testing for the customer’s applications and products using NXP
Semiconductors products in order to avoid a default of the applications and
the products or of the application or use by customer’s third party
customer(s). NXP does not accept any liability in this respect.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
damage to the device. Limiting values are stress ratings only and (proper)
operation of the device at these or any other conditions above those given in
the Recommended operating conditions section (if present) or the
Characteristics sections of this document is not warranted. Constant or
repeated exposure to limiting values will permanently and irreversibly affect
the quality and reliability of the device.
Terms and conditions of commercial sale — NXP Semiconductors
products are sold subject to the general terms and conditions of commercial
sale, as published at http://www.nxp.com/profile/terms, unless otherwise
agreed in a valid written individual agreement. In case an individual
agreement is concluded only the terms and conditions of the respective
agreement shall apply. NXP Semiconductors hereby expressly objects to
applying the customer’s general terms and conditions with regard to the
purchase of NXP Semiconductors products by customer.
No offer to sell or license — Nothing in this document may be interpreted or
construed as an offer to sell products that is open for acceptance or the grant,
conveyance or implication of any license under any copyrights, patents or
other industrial or intellectual property rights.
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 18 November 2015
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90 of 95
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Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a prior
authorization from competent authorities.
Non-automotive qualified products — Unless this data sheet expressly
states that this specific NXP Semiconductors product is automotive qualified,
the product is not suitable for automotive use. It is neither qualified nor tested
in accordance with automotive testing or application requirements. NXP
Semiconductors accepts no liability for inclusion and/or use of
non-automotive qualified products in automotive equipment or applications.
In the event that customer uses the product for design-in and use in
automotive applications to automotive specifications and standards, customer
(a) shall use the product without NXP Semiconductors’ warranty of the
product for such automotive applications, use and specifications, and (b)
whenever customer uses the product for automotive applications beyond
NXP Semiconductors’ specifications such use shall be solely at customer’s
own risk, and (c) customer fully indemnifies NXP Semiconductors for any
liability, damages or failed product claims resulting from customer design and
use of the product for automotive applications beyond NXP Semiconductors’
standard warranty and NXP Semiconductors’ product specifications.
Translations — A non-English (translated) version of a document is for
reference only. The English version shall prevail in case of any discrepancy
between the translated and English versions.
27.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.
I2C-bus — logo is a trademark of NXP Semiconductors N.V.
28. Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
PCF85363A
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91 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
29. Tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Table 15.
Table 16.
Table 17.
Table 18.
Table 19.
Table 20.
Table 21.
Table 22.
Table 23.
Table 24.
Table 25.
Table 26.
Table 27.
Table 28.
Table 29.
Table 30.
Table 31.
Table 32.
Table 33.
Table 34.
Table 35.
Table 36.
Table 37.
Ordering information . . . . . . . . . . . . . . . . . . . . .2
Ordering options . . . . . . . . . . . . . . . . . . . . . . . . .2
Marking codes . . . . . . . . . . . . . . . . . . . . . . . . . .2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . .5
RTC mode time registers . . . . . . . . . . . . . . . . . .8
Stop-watch mode time registers . . . . . . . . . . .10
Control and function registers overview . . . . . .12
Time and date registers in RTC mode
(RTCM = 0). . . . . . . . . . . . . . . . . . . . . . . . . . . .13
BCD coding . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Weekday assignments . . . . . . . . . . . . . . . . . . .15
Month assignments in BCD format . . . . . . . . . .15
Time registers in stop-watch mode
(RTCM = 1). . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Alarm1 and alarm2 registers in RTC mode
coded in BCD (RTCM = 0) . . . . . . . . . . . . . . . .19
Alarm_enables- alarm enable control register
(address 10h) bit description . . . . . . . . . . . . . .19
Alarm1 and alarm2 registers in stop-watch
mode coded in BCD (RTCM = 1) . . . . . . . . . . .22
Alarm_enables- alarm enable control register
(address 10h) bit description . . . . . . . . . . . . . .22
WatchDog - WatchDog control and register
(address 2Dh) bit description . . . . . . . . . . . . . .25
WatchDog durations . . . . . . . . . . . . . . . . . . . . .25
RAM_byte - 8-bit RAM register (address 2Ch)
bit description . . . . . . . . . . . . . . . . . . . . . . . . . .27
TSR_mode - timestamp mode control register
(address 23h) bit description . . . . . . . . . . . . . .29
Timestamp registers in RTC mode (RTCM = 0)31
timestamp registers in stop-watch mode
(RTCM = 1). . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Offset - offset register (address 24h) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
OFFM bit - oscillator control register
(address 25h) . . . . . . . . . . . . . . . . . . . . . . . . . .33
Offset values . . . . . . . . . . . . . . . . . . . . . . . . . .33
Correction pulses for OFFM = 0 . . . . . . . . . . . .34
Correction pulses for OFFM = 1 . . . . . . . . . . . .35
INTA and INTB interrupt control bits . . . . . . . . .38
Definition of interrupt control bits . . . . . . . . . . .38
Oscillator - oscillator control register
(address 25h) bit description . . . . . . . . . . . . . .41
CLKIV bit - oscillator control register
(address 25h) . . . . . . . . . . . . . . . . . . . . . . . . . .41
12_24 bit - oscillator control register
(address 25h) . . . . . . . . . . . . . . . . . . . . . . . . . .41
LOWJ bit - oscillator control register
(address 25h) . . . . . . . . . . . . . . . . . . . . . . . . . .41
OSCD[1:0] bits - oscillator control register
(address 25h) . . . . . . . . . . . . . . . . . . . . . . . . . .42
CL[1:0] bits - oscillator control register
(address 25h) . . . . . . . . . . . . . . . . . . . . . . . . . .42
IO pin behavior in battery mode . . . . . . . . . . . .43
Battery_switch - battery switch control
(address 26h) bit description . . . . . . . . . . . . . .43
PCF85363A
Product data sheet
Table 38. BSOFF bit - battery switch control
(address 26h) bit description . . . . . . . . . . . . . . 43
Table 39. BSRR bit - battery switch control
(address 26h) bit description . . . . . . . . . . . . . . 44
Table 40. BSM[1:0] bits - battery switch control
(address 26h) bit description . . . . . . . . . . . . . . 44
Table 41. Battery switch-over modes. . . . . . . . . . . . . . . . 44
Table 42. BSTH - battery switch control (address 26h)
bit description. . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 43. Pin_IO- pin input output control register
(address 27h) bit description . . . . . . . . . . . . . . 49
Table 44. CLKPM bit - Pin_IO control register
(address 27h). . . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 45. TSPULL bit - Pin_IO control register
(address 27h). . . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 46. TSL bit - Pin_IO control register (address 27h) 50
Table 47. TSPM[1:0] bits - Pin_IO control register
(address 27h). . . . . . . . . . . . . . . . . . . . . . . . . . 50
Table 48. TSIM bit - Pin_IO control register
(address 27h). . . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 49. INTAPM[1:0] bits - Pin_IO control register
(address 27h). . . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 50. INTA battery mode . . . . . . . . . . . . . . . . . . . . . . 52
Table 51. Function - chip function control register
(address 28h) bit description . . . . . . . . . . . . . . 53
Table 52. 100TH bit - Function control register
(address 28h). . . . . . . . . . . . . . . . . . . . . . . . . . 53
Table 53. PI[1:0] bits - Function control register
(address 28h). . . . . . . . . . . . . . . . . . . . . . . . . . 53
Table 54. RTCM bit - Function control register
(address 28h). . . . . . . . . . . . . . . . . . . . . . . . . . 54
Table 55. RTC time counting modes . . . . . . . . . . . . . . . . 54
Table 56. STOPM bit - Function control register
(address 28h). . . . . . . . . . . . . . . . . . . . . . . . . . 54
Table 57. Oscillator stop control when STOPM = 1 . . . . . 54
Table 58. COF[2:0] bits - Function control register
(address 28h). . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 59. Clock duty cycles . . . . . . . . . . . . . . . . . . . . . . . 55
Table 60. Flags - Flag status register (address 2Bh)
bit description. . . . . . . . . . . . . . . . . . . . . . . . . . 56
Table 61. Reset - software reset control (address 2Fh)
bit description. . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 62. Registers reset values . . . . . . . . . . . . . . . . . . 58
Table 63. Stop_enable - control of STOP bit
(address 2Eh) . . . . . . . . . . . . . . . . . . . . . . . . . 59
Table 64. Counter stop signal . . . . . . . . . . . . . . . . . . . . . 59
Table 65. I2C slave address byte . . . . . . . . . . . . . . . . . . . 65
Table 66. Application configuration . . . . . . . . . . . . . . . . . 67
Table 67. Limiting values . . . . . . . . . . . . . . . . . . . . . . . . 69
Table 68. Static characteristics . . . . . . . . . . . . . . . . . . . . 70
Table 69. I2C-bus characteristics . . . . . . . . . . . . . . . . . . . 75
Table 70. SnPb eutectic process (from J-STD-020D) . . . 82
Table 71. Lead-free process (from J-STD-020D) . . . . . . 82
Table 72. Selection of Real-Time Clocks . . . . . . . . . . . . 86
Table 73. Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 88
Table 74. Revision history . . . . . . . . . . . . . . . . . . . . . . . . 89
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 18 November 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
92 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
30. Figures
Fig 1.
Fig 2.
Fig 3.
Fig 4.
Fig 5.
Fig 6.
Fig 7.
Fig 8.
Fig 9.
Fig 10.
Fig 11.
Fig 12.
Fig 13.
Fig 14.
Fig 15.
Fig 16.
Fig 17.
Fig 18.
Fig 19.
Fig 20.
Fig 21.
Fig 22.
Fig 23.
Fig 24.
Fig 25.
Fig 26.
Fig 27.
Fig 28.
Fig 29.
Fig 30.
Fig 31.
Fig 32.
Fig 33.
Fig 34.
Fig 35.
Fig 36.
Fig 37.
Fig 38.
Fig 39.
Fig 40.
Fig 41.
Fig 42.
Fig 43.
Fig 44.
Fig 45.
Fig 46.
Fig 47.
Block diagram of PCF85363A . . . . . . . . . . . . . . . .3
Pin configuration for PCF85363ATL
(DFN2626-10) . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Pin configuration for PCF85363ATT (TSSOP8). . .4
Pin configuration for PCF85363ATT1 (TSSOP10).4
Address register incrementing . . . . . . . . . . . . . . . .6
Register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Time mode register set selection . . . . . . . . . . . . . .7
OS status bit . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Data flow for the time function . . . . . . . . . . . . . . .16
Data flow for the stop-watch function. . . . . . . . . .18
Alarm1 and alarm2 function block diagram
(RTC mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Alarm1 and alarm2 function block diagram
(stop-watch mode) . . . . . . . . . . . . . . . . . . . . . . . .24
WatchDog repeat mode . . . . . . . . . . . . . . . . . . . .26
WatchDog single shot mode . . . . . . . . . . . . . . . .27
Timestamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Example battery switch-over timestamp . . . . . . .30
Example TS pin driven timestamp . . . . . . . . . . . .30
Offset calibration calculation workflow . . . . . . . . .36
Result of offset calibration . . . . . . . . . . . . . . . . . .37
Interrupt pulse width. . . . . . . . . . . . . . . . . . . . . . .39
Interrupt selection . . . . . . . . . . . . . . . . . . . . . . . .40
Threshold voltage switching hysteresis . . . . . . . .45
Switching at Vth . . . . . . . . . . . . . . . . . . . . . . . . . .45
Switching at VBAT . . . . . . . . . . . . . . . . . . . . . . . . .46
Switching at the higher of VBAT or Vth . . . . . . . . .47
Switching at the lower of VBAT or Vth . . . . . . . . . .48
TS pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
INTA pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Software reset command . . . . . . . . . . . . . . . . . . .57
CPR and STOP bit functional diagram . . . . . . . .60
STOP release timing . . . . . . . . . . . . . . . . . . . . . .60
I2C read and write protocol . . . . . . . . . . . . . . . . .62
I2C read and write signaling. . . . . . . . . . . . . . . . .62
Application example. . . . . . . . . . . . . . . . . . . . . . .66
Application example timing . . . . . . . . . . . . . . . . .67
Device diode protection diagram of PCF85363A.68
Typical IDD with respect to fSCL . . . . . . . . . . . . . .72
Typical IDD as a function of temperature . . . . . . .72
Typical IDD with respect to VDD . . . . . . . . . . . . . .73
Oscillator frequency variation with respect
to VDD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
I2C-bus timing diagram; rise and fall times
refer to 30 % and 70 % . . . . . . . . . . . . . . . . . . . .76
Application diagram for PCF85363A . . . . . . . . . .77
Package outline SOT1197-1 (DFN2626-10),
PCF85363ATL . . . . . . . . . . . . . . . . . . . . . . . . . . .78
Package outline SOT505-1 (TSSOP8),
PCF85363ATT . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Package outline SOT552-1 (TSSOP10),
PCF85363ATT1 . . . . . . . . . . . . . . . . . . . . . . . . . .80
Temperature profiles for large and small
components . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
Footprint information for reflow soldering of
PCF85363A
Product data sheet
SOT505-1 (TSSOP8), PCF85363ATT . . . . . . . . 83
Fig 48. Footprint information for reflow soldering of
SOT1197-1 (DFN2626-10),PCF85363ATL . . . . . 84
Fig 49. Footprint information for reflow soldering of
SOT552-1 (TSSOP10), PCF85363ATT1 . . . . . . 85
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 18 November 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
93 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
31. Contents
1
2
3
4
4.1
5
6
7
7.1
7.2
8
8.1
8.1.1
8.1.1.1
8.1.1.2
8.1.2
8.2
8.2.1
8.2.2
8.2.3
8.2.4
8.2.5
8.2.6
8.3
8.3.1
8.4
8.4.1
8.4.1.1
8.4.1.2
8.4.1.3
8.4.2
8.4.2.1
8.4.2.2
8.4.2.3
8.4.3
8.5
8.5.1
8.5.1.1
8.5.1.2
8.5.1.3
8.6
8.7
General description . . . . . . . . . . . . . . . . . . . . . . 1
Features and benefits . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ordering information . . . . . . . . . . . . . . . . . . . . . 2
Ordering options . . . . . . . . . . . . . . . . . . . . . . . . 2
Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pinning information . . . . . . . . . . . . . . . . . . . . . . 4
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5
Functional description . . . . . . . . . . . . . . . . . . . 6
Registers organization overview. . . . . . . . . . . . 7
Time mode registers . . . . . . . . . . . . . . . . . . . . . 7
RTC mode time registers overview (RTCM = 0) 8
Stop-watch mode time registers (RTCM = 1) . 10
Control registers overview . . . . . . . . . . . . . . . 12
RTC mode time and date registers. . . . . . . . . 13
Definition of BCD . . . . . . . . . . . . . . . . . . . . . . 13
OS: Oscillator stop . . . . . . . . . . . . . . . . . . . . . 14
EMON: event monitor . . . . . . . . . . . . . . . . . . . 14
Definition of weekdays . . . . . . . . . . . . . . . . . . 15
Definition of months . . . . . . . . . . . . . . . . . . . . 15
Setting and reading the time in RTC mode. . . 16
Stop-watch mode time registers . . . . . . . . . . . 17
Setting and reading the time in stop-watch
mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Alarms in RTC mode . . . . . . . . . . . . . . . . . . . 18
Alarm1 and alarm2 registers in RTC mode . . 18
Alarm1 and alarm2 control in RTC mode . . . . 19
Alarm1 and alarm2 function in RTC mode . . . 20
Alarms in stop-watch mode . . . . . . . . . . . . . . 21
Alarm1 and alarm2 registers in stop-watch
mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Alarm1 and alarm2 control in stop-watch
mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Alarm1 and alarm2 function in stop-watch
mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Alarm interrupts . . . . . . . . . . . . . . . . . . . . . . . 24
WatchDog . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
WatchDog functions . . . . . . . . . . . . . . . . . . . . 25
WatchDog repeat mode . . . . . . . . . . . . . . . . . 26
WatchDog single shot mode. . . . . . . . . . . . . . 26
WatchDog interrupts . . . . . . . . . . . . . . . . . . . 27
Single RAM byte . . . . . . . . . . . . . . . . . . . . . . . 27
Timestamps . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.7.1
8.8
8.8.1
8.8.2
8.8.3
8.8.4
8.9
8.9.1
8.9.2
8.10
8.10.1
8.10.2
8.10.3
8.10.4
8.10.5
8.10.6
8.11
8.11.1
8.11.2
8.11.3
8.11.3.1
8.11.3.2
8.11.3.3
8.11.3.4
8.11.4
8.11.5
8.12
8.12.1
8.12.2
8.12.3
8.12.4
8.12.4.1
8.12.4.2
8.12.4.3
8.12.5
8.12.5.1
8.12.6
8.12.6.1
8.12.6.2
8.12.6.3
8.13
8.13.1
8.13.2
8.13.3
8.13.4
8.13.5
Timestamps interrupts . . . . . . . . . . . . . . . . . .
Offset register . . . . . . . . . . . . . . . . . . . . . . . .
Correction when OFFM = 0 . . . . . . . . . . . . . .
Correction when OFFM = 1 . . . . . . . . . . . . . .
Offset calibration workflow . . . . . . . . . . . . . . .
Offset interrupts . . . . . . . . . . . . . . . . . . . . . . .
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ILPA/ILPB: interrupt level or pulse mode . . . .
Interrupt enable bits . . . . . . . . . . . . . . . . . . . .
Oscillator register . . . . . . . . . . . . . . . . . . . . . .
CLKIV: invert the clock output . . . . . . . . . . . .
OFFM: offset calibration mode. . . . . . . . . . . .
12_24: 12 hour or 24 hour clock . . . . . . . . . .
LOWJ: low jitter mode . . . . . . . . . . . . . . . . . .
OSCD[1:0]: quartz oscillator drive control . . .
CL[1:0]: quartz oscillator load capacitance . .
Battery switch register . . . . . . . . . . . . . . . . . .
BSOFF: battery switch on/off control . . . . . . .
BSRR: battery switch internal refresh rate. . .
BSM[1:0]: battery switch mode . . . . . . . . . . .
Switching at the Vth level, BSM[1:0] = 00. . . .
Switching at the VBAT level, BSM[1:0] = 01 . .
Switching at the higher of VBAT or Vth level,
BSM[1:0] = 10 . . . . . . . . . . . . . . . . . . . . . . . .
Switching at the lower of VBAT and Vth level,
BSM[1:0] = 11 . . . . . . . . . . . . . . . . . . . . . . . .
BSTH: threshold voltage control . . . . . . . . . .
Battery switch interrupts . . . . . . . . . . . . . . . .
Pin_IO register . . . . . . . . . . . . . . . . . . . . . . . .
CLKPM: CLK pin mode control . . . . . . . . . . .
TSPULL: TS pin pull-up resistor value. . . . . .
TSL: TS pin level sense . . . . . . . . . . . . . . . . .
TSPM[1:0]: TS pin I/O control . . . . . . . . . . . .
TS pin output mode; INTB . . . . . . . . . . . . . . .
TS pin output mode; CLK. . . . . . . . . . . . . . . .
TS pin disabled . . . . . . . . . . . . . . . . . . . . . . .
TSIM: TS pin input type control . . . . . . . . . . .
TS pin input mode . . . . . . . . . . . . . . . . . . . . .
INTAPM[1:0]: INTA pin mode control . . . . . . .
INTAPM[1:0]: INTA. . . . . . . . . . . . . . . . . . . . .
INTAPM[1:0]: clock data. . . . . . . . . . . . . . . . .
INTAPM[1:0]: battery mode indication . . . . . .
Function register . . . . . . . . . . . . . . . . . . . . . .
100TH: 100th seconds mode. . . . . . . . . . . . .
PI[1:0]: Periodic interrupt . . . . . . . . . . . . . . . .
RTCM: RTC mode . . . . . . . . . . . . . . . . . . . . .
STOPM: STOP mode control. . . . . . . . . . . . .
COF[2:0]: Clock output frequency . . . . . . . . .
32
33
34
34
36
37
37
38
39
41
41
41
41
41
42
42
43
43
44
44
45
46
47
48
48
48
49
49
49
50
50
50
51
51
51
51
51
52
52
52
53
53
53
54
54
55
continued >>
PCF85363A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 18 November 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
94 of 95
PCF85363A
NXP Semiconductors
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8.14
Flags register . . . . . . . . . . . . . . . . . . . . . . . . . 56
8.15
Reset register . . . . . . . . . . . . . . . . . . . . . . . . . 57
8.15.1
SR - Software reset . . . . . . . . . . . . . . . . . . . . 57
8.15.2
CPR: clear prescaler . . . . . . . . . . . . . . . . . . . 59
8.15.3
CTS: clear timestamp . . . . . . . . . . . . . . . . . . 59
8.16
Stop_enable register. . . . . . . . . . . . . . . . . . . . 59
8.17
64 byte RAM . . . . . . . . . . . . . . . . . . . . . . . . . . 61
2
9
I C-bus interface . . . . . . . . . . . . . . . . . . . . . . . 62
9.1
Bit transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
9.2
START and STOP conditions . . . . . . . . . . . . . 63
9.3
Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . 63
10
Interface protocol . . . . . . . . . . . . . . . . . . . . . . 64
10.1
Write protocol . . . . . . . . . . . . . . . . . . . . . . . . . 64
10.2
Read protocol . . . . . . . . . . . . . . . . . . . . . . . . . 64
10.3
Slave addressing . . . . . . . . . . . . . . . . . . . . . . 65
10.3.1
Slave address . . . . . . . . . . . . . . . . . . . . . . . . . 65
11
Application design-in information . . . . . . . . . 66
12
Internal circuitry. . . . . . . . . . . . . . . . . . . . . . . . 68
13
Safety notes . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
14
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 69
15
Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 70
16
Application information. . . . . . . . . . . . . . . . . . 77
17
Test information . . . . . . . . . . . . . . . . . . . . . . . . 77
17.1
Quality information . . . . . . . . . . . . . . . . . . . . . 77
18
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 78
19
Handling information. . . . . . . . . . . . . . . . . . . . 81
20
Packing information . . . . . . . . . . . . . . . . . . . . 81
21
Soldering of SMD packages . . . . . . . . . . . . . . 81
21.1
Introduction to soldering . . . . . . . . . . . . . . . . . 81
21.2
Wave and reflow soldering . . . . . . . . . . . . . . . 81
21.3
Wave soldering . . . . . . . . . . . . . . . . . . . . . . . . 82
21.4
Reflow soldering . . . . . . . . . . . . . . . . . . . . . . . 82
22
Footprint information . . . . . . . . . . . . . . . . . . . 83
23
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
23.1
Real-Time Clock selection . . . . . . . . . . . . . . . 86
24
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 88
25
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
26
Revision history . . . . . . . . . . . . . . . . . . . . . . . . 89
27
Legal information. . . . . . . . . . . . . . . . . . . . . . . 90
27.1
Data sheet status . . . . . . . . . . . . . . . . . . . . . . 90
27.2
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
27.3
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
27.4
Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 91
28
Contact information. . . . . . . . . . . . . . . . . . . . . 91
29
Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
30
Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
31
Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP Semiconductors N.V. 2015.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
Date of release: 18 November 2015
Document identifier: PCF85363A