M41T83_12 Datasheet, PDF (10/62 Pages) STMicroelectronics – Serial I2C bus real-time clock (RTC) with battery switchover

Description
Figure 6. M41T82 block diagram
CRYSTAL
SDA
SCL
XI
32KHz
OSCILLATOR
XO
I2C
INTERFACE
WRITE
PROTECT
VCC < VR_ST
M41T82-M41T83
REAL TIME CLOCK
CALENDAR
OSCILLATOR FAIL
CIRCUIT
ALARM1
ALARM2
WATCHDOG
FT
FREQUENCY TEST
OUTPUT DRIVER
8-BIT COUNTER
USER SRAM (7 Bytes)
VCC
VBAT
VR_ST/VSO(1) ^COMPARE
1. V_RST = V_SO = 2.93 V (S), 2.63 V (R), and 2.32 V (Z).
2. Open drain output.
Figure 7. M41T82 hardware hookup
VCC
INTERNAL
POWER
trec
TIMER
RST ⁽²⁾
AI11812
M41T82
VCC
XI
XO
VBAT
V_SS
FT/RST(1)
SCL
SDA
10/62
1. Open drain output.
Doc ID 12578 Rev 15
MCU
VCC
Reset Input
Serial Clock Line
Serial Data Line
AI11813