STMICROELECTRONICS M41TC8025

M41TC8025
Highly accurate, temperature-compensated
serial real-time clock (RTC) with embedded crystal
Data brief
Features
■
Embedded high-stability 32 KHz DTCXO
■
Temperature-compensated serial real-time
clock
– ±5.0 ppm max from -40 to 85 °C
– ±3.8 ppm max from 0 to 50 °C
■
Supply voltage
– Clock operating & timekeeping: 1.6 to 5.5 V
– I2C interface operating: 1.8 to 5.5 V
– Temperature compensation: 2.2 to 5.5 V
■
0.8 µA typical current at 3.0 V supply voltage
■
400 kHz I2C interface
■
Time-of-day alarm (with interrupt)
■
Fixed-cycle timer interrupt function
■
Time update interrupt function
■
Programmable frequency output
– FOUT = 1 Hz, 1 KHz and 32 KHz
■
Registers for seconds, minutes, hours, day-ofweek, date (day of month), month and year
with automatic leap year compensation
■
Programmable temperature compensation
intervals (0.5 s, 2 s default, 10 s, 30 s)
Description
Power meters
■
Industrial applications
Table 1.
The M41TC8025 is a serial I2C real-time clock
(RTC) incorporating temperature compensation to
maintain accurate timekeeping over the industrial
temperature range of -40 to +85 °C. In addition to
providing date and time (seconds, minutes, hours,
day-of-week, date (day of month), month and
year), the device also provides an alarm function,
fixed-cycle timer, time update interrupt and
programmable frequency outputs (1 Hz, 1 KHz
and 32 KHz).
The M41TC8025 is provided in a 200 mil, 14-pin
SOIC package.
Applications
■
SO14
14-pin SOIC
Device summary
Order code
Accuracy
Package
M41TC8025AMC6F
±5.0 ppm (-40 to 85 °C)
±3.8 ppm (0 to 50 °C)
SO14
September 2012
Doc ID 023561 Rev 2
For further information contact your local STMicroelectronics sales office.
1/8
www.st.com
8
Device overview
1
M41TC8025
Device overview
Figure 1.
Logic diagram
6##
3#,
)21
3$!
&/54
&/%
633
!-V
1. IRQ is an open-drain output
2. FOUT is a CMOS output
Figure 2.
Pinout
.#
3#,
&/54
.&
$5
6##
&/%
Table 2.
Note:
2/8
.#
3$!
.&
633
)21
.&
.#
!-V
Pin description
Pin
Name
Description
1
NC
No connect. The NC pin can be connected to VCC, GND or left floating.
2
SCL
Serial clock input
3
FOUT
4
NF
No function. The NF pin can be connected to VCC, GND or left floating.
5
DU
Do not use externally. The DU pin must be left floating.
6
VCC
Power supply
7
FOE
Frequency output enable, controls the frequency output on FOUT pin
8
NC
No connect. The NC pin can be connected to VCC, GND or left floating.
9
NF
No function. The NF pin can be connected to VCC, GND or left floating.
10
IRQ
Interrupt output (open drain)
11
VSS
Ground supply
12
NF
No function. The NF pin can be connected to VCC, GND or left floating.
13
SDA
Serial data input/output
14
NC
No connect. The NC pin can be connected to VCC, GND or left floating.
Programmable frequency output (CMOS). The FOUT pin is Hi-Z if FOE is low.
Be sure to connect a 0.1 µF to 1 µF bypass capacitor between VCC and VSS.
Doc ID 023561 Rev 2
M41TC8025
Figure 3.
Device overview
Block diagram
INTERRUPT
CONTROL
TEMP
SENSOR
COMPENSATION
CONTROL
32KHz TEMP-COMPENSATED
OSC & CAPACITOR ARRAY
UIE TIE AIE
IRQ
TIME
UPDATE
VCC
32KHz
32KHz
1KHz
FIXED-CYCLE
TIMER
1Hz
DIVIDE BY
32768
ALARM
COMPARE
FOUT
(SQW)
FOE
1 Hz
CLOCK
REGISTERS
SDA
SCL
SECONDS
MINUTES
HOURS
DAY-OF-WEEK
DATE
MONTH
YEAR
I2C
INTERFACE
MIN Alarm
HOUR Alarm
DAY/WEEK Alarm
DATE Alarm
0 - 59
COUNTER
0 - 59
COUNTER
0 - 23
COUNTER
1-7
COUNTER
1 - 12
COUNTER
0 - 99
COUNTER
1 - 31
ALARM
REGISTERS
TIMER COUNTER 0
TIMER COUNTER 1
EXTENSION REG
FLAG REGISTER
CONTROL REG
VSS
COUNTER
NON-CLOCK
REGISTERS
AM045299v2
Figure 4.
Hardware hookup
9&&
%$7
9&&
6&/
6&/
,54
*3,2
6'$
6'$
)2(
07&
0&8
)287
9VV
!-V
Doc ID 023561 Rev 2
3/8
Package mechanical data
2
M41TC8025
Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Figure 5.
SO14 - 14-lead small outline (200 mils body width) package mechanical
drawing
8348832_B
4/8
Doc ID 023561 Rev 2
M41TC8025
Table 3.
Package mechanical data
SO14 - 14-lead small outline (200 mils body width) package mechanical data
mm
in
Symbol
Min
Typ
Max
Min
Typ
Max
A
-
-
2.25
-
-
0.089
A1
0.15
0.20
0.25
0.006
0.008
0.010
A2
1.80
1.90
2.00
0.071
0.075
0.079
A3
0.85
0.95
1.05
0.033
0.037
0.041
b
0.41
-
0.54
0.016
-
0.021
b1
0.40
0.45
0.50
0.016
0.018
0.020
c
0.14
-
0.21
0.006
-
0.008
c1
0.13
0.15
0.17
0.005
0.006
0.007
D1
9.80
9.90
10.00
0.386
0.390
0.394
D(1)
10.05
10.15
10.25
0.396
0.400
0.404
E
7.30
7.45
7.60
0.287
0.293
0.299
E1
5.20
5.30
5.40
0.205
0.209
0.213
e
L
1.27
0.30
L1
0.50
0.050
0.70
0.012
1.07 ref.
0.020
0.028
0.042 ref.
R
0.07
-
-
0.003
-
-
R1
0.07
-
-
0.003
-
-
θ1
0°
-
8°
0°
-
8°
θ2
13°
15°
17°
13°
15°
17°
θ3
6°
8°
10°
6°
8°
10°
θ4
9.5°
11.5°
13.5°
9.5°
11.5°
13.5°
θ5
6°
8°
10°
6°
8°
10°
1. Dimension “D” includes mold flash.
Doc ID 023561 Rev 2
5/8
Part numbering
3
M41TC8025
Part numbering
Table 4.
Ordering information scheme
Example:
M41TC
8025
A
MC
6
F
Device family
M41TC
Device type
8025
Accuracy
A = ±5.0 ppm (-40 to 85 °C)
±3.8 ppm (0 to 50 °C)
Package
MC = SO14
Temperature range
6 = –40 °C to 85 °C
Shipping method
F = ECOPACK® package, tape & reel
For other options, or for more information on any aspect of this device, please contact the
ST sales office nearest you.
6/8
Doc ID 023561 Rev 2
M41TC8025
4
Revision history
Revision history
Table 5.
Document revision history
Date
Revision
Changes
21-Aug-2012
1
Initial release.
21-Sep-2012
2
Modified title of document; updated Figure 3: Block diagram.
Doc ID 023561 Rev 2
7/8
M41TC8025
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this
document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products
or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such
third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS
OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
UNLESS EXPRESSLY APPROVED IN WRITING BY TWO AUTHORIZED ST REPRESENTATIVES, ST PRODUCTS ARE NOT
RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING
APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY,
DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE
GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any
liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries.
Information in this document supersedes and replaces all information previously supplied.
The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
© 2012 STMicroelectronics - All rights reserved
STMicroelectronics group of companies
Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America
www.st.com
8/8
Doc ID 023561 Rev 2