Catalyst CAT1162J-28TE13 Supervisory circuits with i2c serial cmos eeprom, precision reset controller and watchdog timer Datasheet

CAT1161/2 (16K)
Supervisory Circuits with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer
FEATURES
■ Active high or low reset
■ Watchdog monitors SDA signal (CAT1161)
2
— Precision power supply voltage monitor
■ 400kHz I C bus compatible
— 5V, 3.3V and 3V systems
■ 2.7V to 6.0V operation
— Five threshold voltage options
■ Low power CMOS technology
■ 1,000,000 Program/Erase cycles
■ 16-Byte page write buffer
■ Manual Reset
■ Built-in inadvertent write protection
■ 100 Year data retention
— VCC lock out
■ 8-pin DIP or 8-pin SOIC
— Write protect pin, WP
■ Commercial and industrial temperature ranges
DESCRIPTION
The CAT1161/2 is a complete memory and supervisory
solution for microcontroller-based systems. A serial
EEPROM memory (16K) with hardware memory write
protection, a system power supervisor with brown out
protection and a watchdog timer are integrated together
in low power CMOS technology. Memory interface is via
an I2C bus.
The 1.6-second watchdog circuit returns a system to a
known good state if a software or hardware glitch halts
or “hangs” the system. The CAT1161 watchdog monitors
the SDA line, making an additional PC board trace
unnecessary. The lower cost CAT1162 does not have a
watchdog timer.
voltages support 5V, 3.3V and 3V systems. If power supply
voltages are out of tolerance reset signals become active,
preventing the system microcontroller, ASIC or peripherals
from operating. Reset signals become inactive typically 200
ms after the supply voltage exceeds the reset threshold
level. With both active high and low reset signals, interface
to microcontrollers and other ICs is simple. In addition, a
reset pin can be used as a debounced input for push-button
manual reset capability.
The CAT1161/2 memory features a 16-byte page. In addition,
hardware data protection is provided by a write protect pin
WP and by a VCC sense circuit that prevents writes to
memory whenever VCC falls below the reset threshold or
until VCC reaches the reset threshold during power up.
The power supply monitor and reset circuit protects
memory and system controllers during power up/down
and against brownout conditions. Five reset threshold
Available packages include an 8-pin DIP and a surface
mount, 8-pin SO package.
PIN CONFIGURATION
BLOCK DIAGRAM
EXTERNAL LOAD
DC
RESET
WP
GND
VCC
RESET
SCL
SDA
CAT1161/2
SENSE AMPS
SHIFT REGISTERS
DOUT
ACK
VCC
GND
SDA
WORD ADDRESS
BUFFERS
START/STOP
LOGIC
XDEC
DC = Do not connect
Part Dash Minimum
Number Threshold
WP
4.50
4.75
-42
4.25
4.50
-30
3.00
3.15
DATA IN STORAGE
HIGH VOLTAGE/
TIMING CONTROL
RESET Controller
-28
2.85
3.00
-25
2.55
2.70
16K
EEPROM
CONTROL
LOGIC
Maximum
Threshold
-45
COLUMN
DECODERS
Only for
CAT1161
WATCHDOG
Precision
Vcc Monitor
STATE COUNTERS
SCL
SLAVE
ADDRESS
COMPARATORS
RESET RESET
© 2002 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc No. 3002, Rev. D
CAT1161/2
PIN FUNCTIONS
ABSOLUTE MAXIMUM RATINGS
Pin No. Pin Name
Temperature Under Bias ................. –55°C to +125°C
Function
1
DC
2
RESET
3
WP
VCC with Respect to Ground ............... –2.0V to +7.0V
4
GND
Ground
Package Power Dissipation
Capability (TA = 25°C) ................................... 1.0W
5
SDA
Serial Data/Address
6
SCL
Clock Input
Lead Soldering Temperature (10 secs) ............ 300°C
7
RESET
8
VCC
Power Supply
Min
Max
Storage Temperature ....................... –65°C to +150°C
Voltage on any Pin with
Respect to Ground(1) ............ –2.0V to +VCC +2.0V
Output Short Circuit
Current(2)
........................ 100 mA
Do Not Connect
Active Low Reset I/O
Write Protect
Active High Reset I/O
Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device.
These are stress ratings only, and functional operation
of the device at these or any other conditions outside of
those listed in the operational sections of this specification is not implied. Exposure to any absolute maximum
rating for extended periods may affect device performance and reliability.
RELIABILITY CHARACTERISTICS
Symbol
NEND
(3)
Parameter
Reference Test Method
Units
Endurance
MIL-STD-883, Test Method 1033 1,000,000
Cycles/Byte
TDR(3)
Data Retention
MIL-STD-883, Test Method 1008
100
Years
VZAP(3)
ESD Susceptibility
MIL-STD-883, Test Method 3015
2000
Volts
ILTH(3)(4)
Latch-Up
JEDEC Standard 17
100
mA
D.C. OPERATING CHARACTERISTICS
VCC = +2.7V to +6.0V, unless otherwise specified.
Symbol
Parameter
ICC
Power Supply Current
ISB
Standby Current
ILI
Test Conditions
Min
Typ
Max
Units
fSCL = 100 KHz
3
mA
VCC = 3.3V
VCC = 5
40
50
µA
µA
Input Leakage Current
VIN = GND or VCC
2
µA
ILO
Output Leakage Current
VIN = GND or VCC
10
µA
VIL
Input Low Voltage
-1
VCC x 0.3
V
VIH
Input High Voltage
VCC X 0.7
VCC + 0.5
V
VOL1
Output Low Voltage (SDA) IOL = 3 mA, VCC = 3.0V
0.4
V
Note:
(1) The minimum DC input voltage is –0.5V. During transitions, inputs may undershoot to –2.0V for periods of less than 20 ns. Maximum DC
voltage on output pins is VCC +0.5V, which may overshoot to VCC +2.0V for periods of less than 20 ns.
(2) Output shorted for no more than one second. No more than one output shorted at a time.
(3) This parameter is tested initially and after a design or process change that affects the parameter.
(4) Latch-up protection is provided for stresses up to 100 mA on address and data pins from –1V to VCC +1V.
Doc. No. 3002, Rev. D
2
CAT1161/2
CAPACITANCE
TA = 25˚C, f = 1.0 MHz, VCC = 5V
Symbol
Test
Conditions
Max
Units
CI/O(1)
Input/Output Capacitance (SDA)
VI/O = 0V
8
pF
CIN(1)
Input Capacitance (SCL)
VIN = 0V
6
pF
A.C. CHARACTERISTICS
VCC=2.7V to 6.0V unless otherwise specified.
Output Load is 1 TTL Gate and 100pF.
VCC = 2.7V - 6V
SYMBOL
PARAMETER
FSCL
Clock Frequency
TI(1)
Noise Suppresion Time
Min
VCC = 4.5V - 5.5V
Max
Min
Max
Units
100
400
kHz
200
200
ns
3.5
1
µs
Constant at SCL, SDA Inputs
tAA
SLC Low to SDA Data Out
and ACK Out
tBUF(1)
Time the Bus Must be Free Before
4.7
1.2
µs
4
0.6
µs
a New Transmission Can Start
tHD:STA
Start Condition Hold Time
tLOW
Clock Low Period
4.7
1.2
µs
tHIGH
Clock High Period
4
0.6
µs
tSU:STA
Start Condition Setup Time
4.7
0.6
µs
(for a Repeated Start Condition)
tHD:DAT
Data in Hold Time
0
0
ns
tSU:DAT
Data in Setup Time
50
50
ns
tR(1)
SDA and SCL Rise Time
1
0.3
µs
tF(1)
SDA and SCL Fall Time
300
300
ns
tSU:STO
Stop Condition Setup Time
tDH
Data Out Hold Time
4
0.6
µs
100
100
ns
POWER-UP TIMING (1)(2)
Symbol
Parameter
Max
Units
tPUR
Power-up to Read Operation
1
ms
tPUW
Power-up to Write Operation
1
ms
WRITE CYCLE LIMITS
Symbol
Parameter
tWR
Write Cycle Time
Min
Typ
Max
Units
10
ms
The write cycle time is the time from a valid stop condition of a write sequence to the end of the internal program/erase cycle. During the
write cycle, the bus interface circuits are disabled, SDA is allowed to remain high, and the device does not respond to its slave address.
NOTE:
(1) This parameter is tested initially and after a design or process change that affects the parameter.
(2) tPUR and tPUW are the delays required from the time VCC is stable until the specific operation can be initiated.
3
Doc No. 3002, Rev. D
CAT1161/2
RESET CIRCUIT CHARACTERISTICS
Symbol
Parameter
Min
Typ
Max
Units
tGLITCH
Glitch Reject Pulse Width
100
ns
VRT
Reset Threshold Hystersis
VOLRS
Reset Output Low Voltage (IOLRS=1mA)
VOHRS
Reset Output High Voltage
VCC-0.75
Reset Threshold (VCC=5V)
4.50
4.75
Reset Threshold (VCC=5V)
(CAT1161/2-42)
4.25
4.50
Reset Threshold (VCC=3.3V)
(CAT1161/2-30)
3.00
3.15
Reset Threshold (VCC=3.3V)
(CAT1161/2-28)
2.85
3.00
Reset Threshold (VCC=3V)
(CAT1161/2-25)
2.55
2.70
tPURST
Power-Up Reset Timeout
130
270
twp
Watchdog Period
tRPD
VTH to RESET Output Delay
VRVALID
RESET Output Valid
15
mV
0.4
V
V
(CAT1161/2-45)
VTH
Doc. No. 3002, Rev. D
1.6
4
ms
sec
5
1
V
µs
V
CAT1161/2
PIN DESCRIPTIONS
WP:
WRITE PROTECT
If the pin is tied to VCC the entire memory array
becomes Write Protected (READ only). When the pin
is tied to GND or left floating normal read/write
operations are allowed to the device.
remain active until VCC reaches the VTH threshold and will
continue driving the outputs for approximately 200ms (tPURST)
after reaching VTH. After the tPURST timeout interval, the
device will cease to drive the reset outputs. At this point the
reset outputs will be pulled up or down by their respective pull
up/down resistors. During power-down, the RESET outputs
will be active when VCC falls below VTH. The RESET outputs
will be valid so long as VCC is >1.0V (VRVALID).
RESET/RESET
RESET: RESET I/O
RESET
These are open drain pins and can be used as reset
trigger inputs. By forcing a reset condition on the pins
the device will initiate and maintain a reset condition.
The RESET pin must be connected through a pulldown resistor, and the RESET pin must be connected
through a pull-up resistor.
The RESET pins are I/Os; therefore, the CAT1161/2 can act
as a signal conditioning circuit for an externally applied
manual reset. The inputs are edge triggered; that is, the
RESET input in the CAT1161/2 will initiate a reset timeout
after detecting a low to high transition and the RESET input
will initiate a reset timeout after detecting a high to low
transition.
SDA: SERIAL DATA ADDRESS
The bidirectional serial data/address pin is used to
transfer all data into and out of the device. The SDA
pin is an open drain output and can be wire-ORed
with other open drain or open collector outputs.
Watchdog Timer
The Watchdog Timer provides an independent protection for
microcontrollers. During a system failure, the CAT1161will
respond with a reset signal after a time-out interval of 1.6
seconds for a lack of activity. The CAT1161 is designed with
the Watchdog Timer feature on the SDA input. If the
microcontroller does not toggle the SDA input pin within 1.6
seconds, the Watchdog Timer times out. This will generate
a reset condition on reset outputs. The Watchdog Timer is
cleared by any transition on SDA.
If there is no transition on the SDA for more than 1.6
seconds, the watchdog timer times out.
SCL: SERIAL CLOCK
Serial clock input.
DEVICE OPERATION
Reset Controller Description
As long as the reset signal is asserted, the Watchdog Timer
The CAT1161/2 precision RESET controller ensures will not count and will stay cleared.
correct system operation during brownout and power
up/down conditions. It is configured with open drain The CAT1162 does not have a Watchdog.
RESET outputs. During power-up, the RESET outputs
t
Figure 1. RESET Output Timing
GLITCH
VTH
VRVALID
VCC
t RPD
t PURST
t PURST
RESET
t RPD
RESET
5
Doc No. 3002, Rev. D
CAT1161/2
Hardware Data Protection
falls below (power down) VTH or until VCC reaches the
reset threshold (power up) VTH. Any attempt to access
the internal EEPROM is not recognized and an ACK will
not be sent on the SDA line when RESET or RESET
is active.
The CAT1161/2 is designed with the following hardware
data protection features to provide a high degree of data
integrity.
Reset Threshold Voltage
(1) The CAT1161/2 features a WP pin. When the WP pin
is tied high the entire memory array becomes write
protected (read only).
The CAT1161/2 is offered with five reset threshold
voltage ranges. They are 4.50-4.75V, 4.25-4.50V, 3.003.15V, 2.85-3.00V and 2.55-2.70V.
(2) The VCC sense provides write protection when VCC
falls below the reset threshold value (VTH). The VCC lock
out inhibits writes to the serial EEPROM whenever VCC
Figure 2. Bus Timing
tF
tHIGH
tLOW
tR
tLOW
SCL
tSU:STA
tHD:STA
tHD:DAT
tSU:DAT
tSU:STO
SDA IN
tAA
tBUF
tDH
SDA OUT
Figure 3. Write Cycle Timing
SCL
SDA
8TH BIT
BYTE n
ACK
tWR
STOP
CONDITION
START
CONDITION
Figure 4. Start/Stop Timing
SDA
SCL
START BIT
Doc. No. 3002, Rev. D
STOP BIT
6
ADDRESS
CAT1161/2
FUNCTIONAL DESCRIPTION
STOP Condition
The CAT1161/2 supports the I2C Bus data transmission
protocol. This Inter-Integrated Circuit Bus protocol defines
any device that sends data to the bus to be a transmitter
and any device receiving data to be a receiver. The
transfer is controlled by the Master device which
generates the serial clock and all START and STOP
conditions for bus access. Both the Master device and
Slave device can operate as either transmitter or receiver,
but the Master device controls which mode is activated.
A LOW to HIGH transition of SDA when SCL is HIGH
determines the STOP condition. All operations must end
with a STOP condition.
DEVICE ADDRESSING
The Master begins a transmission by sending a START
condition. The Master sends the address of the particular
slave device it is requesting. The four most significant
bits of the 8-bit slave address are fixed as 1010.
I2C Bus Protocol
The features of the I2C bus protocol are defined as
follows:
The next three bits (Figure 6) define memory addressing.
For the CAT1161/162 the three bits define higher order
bits.
(1) Data transfer may be initiated only when the bus is
not busy.
The last bit of the slave address specifies whether a
Read or Write operation is to be performed. When this bit
is set to 1, a Read operation is selected, and when set
to 0, a Write operation is selected.
(2) During a data transfer, the data line must remain
stable whenever the clock line is high. Any changes in
the data line while the clock line is high will be interpreted
as a START or STOP condition.
After the Master sends a START condition and the slave
address byte, the CAT1161/2 monitors the bus and
responds with an acknowledge (on the SDA line) when
its address matches the transmitted slave address. The
CAT1161/2 then performs a Read or Write operation
depending on the R/W bit.
START Condition
The START Condition precedes all commands to the
device, and is defined as a HIGH to LOW transition of
SDA when SCL is HIGH. The CAT1161/2 monitors the
SDA and SCL lines and will not respond until this
condition is met.
Figure 5. Acknowledge Timing
SCL FROM
MASTER
1
8
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
ACKNOWLEDGE
START
Figure 6. Slave Address Bits
CAT1161/2
CAT 24C163
1
0
1
0
a10
a9
a8
R/W
**a8, a9 and a10 correspond to the address of the memory array address word.
7
Doc No. 3002, Rev. D
CAT1161/2
ACKNOWLEDGE
pointers of the CAT1161/2. After receiving another
acknowledge from the Slave, the Master device transmits
the data to be written into the addressed memory location.
The CAT1161/2 acknowledges once more and the Master
generates the STOP condition. At this time, the device
begins an internal programming cycle to non-volatile
memory. While the cycle is in progress, the device will not
respond to any request from the Master device.
After a successful data transfer, each receiving device
is required to generate an acknowledge. The
acknowledging device pulls down the SDA line during
the ninth clock cycle, signaling that it received the 8 bits
of data.
The CAT1161/2 responds with an acknowledge after
receiving a START condition and its slave address. If the
device has been selected along with a write operation,
it responds with an acknowledge after receiving each 8bit byte.
Page Write
The CAT1161/2 writes up to 16 bytes of data in a single
write cycle, using the Page Write operation. The page
write operation is initiated in the same manner as the byte
write operation, however instead of terminating after the
initial byte is transmitted, the Master is allowed to send up
to 15 additional bytes. After each byte has been
transmitted, the CAT1161/2 will respond with an
acknowledge and internally increment the lower order
address bits by one. The high order bits remain unchanged.
When the CAT1161/2 begins a READ mode it transmits
8 bits of data, releases the SDA line and monitors the
line for an acknowledge. Once it receives this
acknowledge, the CAT1161/2 will continue to transmit
data. If no acknowledge is sent by the Master, the device
terminates data transmission and waits for a STOP
condition.
WRITE OPERATIONS
If the Master transmits more than 16 bytes before sending
the STOP condition, the address counter ‘wraps around,’
and previously transmitted data will be overwritten.
Byte Write
In the Byte Write mode, the Master device sends the
START condition and the slave address information
(with the R/W bit set to zero) to the Slave device. After
the Slave generates an acknowledge, the Master sends
a 8-bit address that is to be written into the address
When all 16 bytes are received, and the STOP condition
has been sent by the Master, the internal programming
cycle begins. At this point, all received data is written to
the CAT1161/2 in a single write cycle.
Figure 7. Byte Write Timing
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
SLAVE
ADDRESS
BYTE
ADDRESS
S
T
O
P
DATA
S
P
A
C
K
A
C
K
A
C
K
Figure 8. Page Write Timing
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
SLAVE
ADDRESS
BYTE
ADDRESS (n)
DATA n+1
S
P
A
C
K
Doc. No. 3002, Rev. D
DATA n
S
T
DATA n+15 O
P
A
C
K
A
C
K
8
A
C
K
A
C
K
CAT1161/2
Acknowledge Polling
protected and becomes read only. The CAT1161/2 will
accept both slave and byte addresses, but the memory
location accessed is protected from programming by the
device’s failure to send an acknowledge after the first
byte of data is received.
Disabling of the inputs can be used to take advantage of
the typical write cycle time. Once the stop condition is
issued to indicate the end of the host’s write opration, the
CAT1161/2 initiates the internal write cycle. ACK polling
can be initiated immediately. This involves issuing the
start condition followed by the slave address for a write
operation. If the CAT1161/2 is still busy with the write
operation, no ACK will be returned. If a write operation
has completed, an ACK will be returned and the host can
then proceed with the next read or write operation.
Read Operations
The READ operation for the CAT1161/2 is initiated in the
same manner as the write operation with one exception,
that R/W bit is set to one. Three different READ operations
are possible: Immediate/Current Address READ,
Selective/Random READ and Sequential READ.
WRITE PROTECTION
The Write Protection feature allows the user to protect
against inadvertent memory array programming. If the
WP pin is tied to VCC, the entire memory array is
Figure 9. Immediate Address Read Timing
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
S
T
O
P
SLAVE
ADDRESS
S
P
A
C
K
DATA
N
O
A
C
K
SCL
SDA
8
9
8TH BIT
DATA OUT
NO ACK
9
STOP
Doc No. 3002, Rev. D
CAT1161/2
Immediate/Current Address Read
The data being transmitted from the CAT1161/2 is
outputted sequentially with data from address N followed
by data from address N+1. The READ operation address
counter increments all of the CAT1161/2 address bits
so that the entire memory array can be read during one
operation. If more than E (where E=2047 for the
CAT1161/162) bytes are read out, the counter will ‘wrap
around’ and continue to clock out data bytes.
The CAT1161/2 address counter contains the address
of the last byte accessed, incremented by one. In other
words, if the last READ or WRITE access was to
address N, the READ immediately following would access
data from address N+1. For all devices, N=E=2047. The
counter will wrap around to Zero and continue to clock
out valid data for the 16K devices. After the CAT1161/
2 receives its slave address information (with the R/W bit
set to one), it issues an acknowledge, then transmits the
8-bit byte requested. The master device does not send
an acknowledge, but will generate a STOP condition.
Manual Reset Operation
The CAT116x RESET or RESET pin can also be used
as a manual reset input.
Only the “active” edge of the manual reset input is
internally sensed. The positive edge is sensed if RESET
is used as a manual reset input and the negative edge
is sensed if RESET is used as a manual reset input.
Selective/Random Read
Selective/Random READ operations allow the Master
device to select at random any memory location for a
READ operation. The Master device first performs a
‘dummy’ write operation by sending the START condition,
slave address and byte addresses of the location it
wishes to read. After the CAT1161/2 acknowledges, the
Master device sends the START condition and the slave
address again, this time with the R/W bit set to one. The
CAT1161/2 then responds with its acknowledge and
sends the 8-bit byte requested. The master device does
not send an acknowledge but will generate a STOP
condition.
An internal counter starts a 200 ms count. During this
time, the complementary reset output will be kept in the
active state. If the manual reset input is forced active for
more than 200 ms, the complementary reset output will
switch back to the non active state after the 200 ms
expired, regardless for how long the manual reset input
is forced active.
The embedded EEPROM is disabled as long as a reset
condition is maintained on any RESET pin. If the external
forced RESET/RESET is longer than internal controlled
time-out period, tPURST, the memory will not respond
with an acknowledge for any access as long as the
manual reset input is active.
Sequential Read
The Sequential READ operation can be initiated by
either the Immediate Address READ or Selective READ
operations. After the CAT1161/2 sends the inital 8-bit
byte requested, the Master will responds with an
acknowledge which tells the device it requires more
data. The CAT1161/2 will continue to output an 8-bit
byte for each acknowledge, thus sending the STOP
condition.
Figure 10. Selective Read Timing
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
SLAVE
ADDRESS
S
T
A
R
T
BYTE
ADDRESS (n)
S
T
O
P
SLAVE
ADDRESS
S
S
A
C
K
A
C
K
P
A
C
K
DATA n
N
O
A
C
K
Doc. No. 3002, Rev. D
10
CAT1161/2
Figure 11. Sequential Read Timing
BUS ACTIVITY:
MASTER
SLAVE
ADDRESS
DATA n
DATA n+1
DATA n+2
S
T
O
P
DATA n+x
SDA LINE
P
A
C
K
A
C
K
A
C
K
A
C
K
N
O
A
C
K
Ordering Information
Prefix
CAT
Optional
Company ID
Device #
1162
Product
Number
1161: 16K
1162: 16K
Suffix
J
-30
I
Temperature Range
Blank = Commercial (0˚ to 70˚C)
I = Industrial (-40˚ to 85˚C)
Package
P: PDIP
J: SOIC (JEDEC)
TE13
Tape & Reel
TE13: 2000/Reel
Reset Threshold
Voltage
45: 4.5-4.75V
42: 4.25-4.5V
30: 3.0-3.15V
28: 2.85-3.0V
25: 2.55-2.7V
Note:
(1) The device used in the above example is a CAT1162JI-30TE13 (16K I2C Memory, SOIC, Industrial Temperature, 3.0-3.15V Reset
Threshold Voltage, Tape and Reel)
11
Doc No. 3002, Rev. D
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Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate
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Publication #:
Revison:
Issue date:
Type:
3002
D
03/29/02
Final
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