M41T00CAPPC1 Datasheet M41T00CAPPC1 | P1-P3

M41T00CAP

Serial access real-time clock (RTC) with integral backup battery

and crystal

Datasheet - production data

Features

• Real-time clock (RTC) with backup battery

integrated into package

• Uses M41T00S enhanced RTC with

precision switchover reference

• 400 kHz I

C serial interface

• Automatic switchover and deselect circuitry

with fixed reference voltage

− V

= 2.7 to 5.5 V operating voltage

range

− 2.6 V (typ) power-fail deselect

(switchover) threshold

• Counters for seconds, minutes, hours, day,

date, month, year and century

• Software clock calibration

• Low operating current of 300 µA

• Oscillator stop detection

• Battery backup

• Operating temperature of 0 to 70 °C

• Self-contained battery and crystal in

CAPHAT™ DIP package

• RoHS compliant

− Lead-free second level interconnect

Description

The M41T00CAP is a low-power serial real-time

clock (RTC) with integral battery and crystal in

ST’s 24-pin CAPHAT™ package. It includes a

crystal controlled, 32.768 kHz oscillator and has

a built-in power sense circuit which detects power

failures and automatically switches to the backup

battery when a power failure occurs.

Eight registers comprise the clock/calendar

function and are configured in binary-coded

decimal (BCD) format. Addresses and data are

transferred serially via an industry standard, two

line, 400 kHz, bidirectional I

C interface. The

built-in address register is incremented

automatically after each WRITE or READ data

byte. The internal lithium coin cell contains ample

energy to sustain timekeeping operation for 10

years in the absence of system power. The eight

clock address locations contain the century, year,

month, date, day, hour, minute, and second in

24-hour BCD format. Corrections for the number

of days in a month, including leap year, are made

automatically (leap year valid up to year 2100).

PCDIP24

Battery/Crystal CAPHAT™

October 2014 DocID014557 Rev 6 1/24

This is information on a product in full production.

www.st.com

Contents

M41T00CAP

Contents

1 Overview .......................................................................................... 5

1.1 Pin connections ................................................................................. 6

1.2 Pin description ................................................................................... 6

2 Operation ......................................................................................... 7

2.1 Wire bus characteristics .................................................................... 7

2.2 Bus not busy ..................................................................................... 7

2.3 Start data transfer ............................................................................. 7

2.4 Stop data transfer .............................................................................. 7

2.5 Data valid .......................................................................................... 8

2.6 Acknowledge ..................................................................................... 8

2.7 READ mode ...................................................................................... 9

2.8 WRITE mode ................................................................................... 11

2.9 Data retention mode ........................................................................ 11

3 Clock operation ............................................................................. 12

3.1 Clock registers ................................................................................ 13

3.2 Calibrating the clock ........................................................................ 13

3.3 Century bit ....................................................................................... 14

3.4 Oscillator fail detection .................................................................... 15

3.5 Output driver pin .............................................................................. 15

3.6 Initial power-on default .................................................................... 15

4 Maximum ratings ........................................................................... 16

5 DC and AC parameters ................................................................. 17

6 Package information ..................................................................... 20

6.1 PCDIP24 package ........................................................................... 20

7 Part numbering .............................................................................. 21

8 Environmental information ........................................................... 22

9 Revision history ............................................................................ 23

2/24 DocID014557 Rev 6

M41T00CAP

List of tables

Table 1: Pin description .............................................................................................................................. 6

Table 2: TIMEKEEPER® register map ..................................................................................................... 12

Table 3: Preferred default values .............................................................................................................. 15

Table 4: Absolute maximum ratings ......................................................................................................... 16

Table 5: Operating and AC measurement conditions ............................................................................... 17

Table 6: Capacitance ................................................................................................................................ 17

Table 7: DC characteristics ....................................................................................................................... 18

Table 8: Power down/up AC characteristics ............................................................................................. 18

Table 9: Power down/up trip points DC characteristics ............................................................................ 19

Table 10: AC characteristics ..................................................................................................................... 19

Table 11: PCDIP24 – 24-pin plastic DIP, battery CAPHAT™, package mechanical data ....................... 20

Table 12: Document revision history ........................................................................................................ 23

DocID014557 Rev 6 3/24

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24

M41T00CAPPC1

Mfr. #:

Buy M41T00CAPPC1

Manufacturer:

STMicroelectronics

Description:

Real Time Clock Serial real-time clock (RTC) with integral backup battery and crystal

Lifecycle:

New from this manufacturer.

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M41T00CAPPC1