M41T82 Datasheet, PDF (12/58 Pages) STMicroelectronics – Serial RTC with battery switchover

Description
Figure 8. M41T83 block diagram
CRYSTAL
SDA
SCL
XI
32KHz
OSCILLATOR
XO
I2C
INTERFACE
WRITE
PROTECT
VCC < VRST
VCC
REAL TIME CLOCK
CALENDAR
OSCILLATOR FAIL
CIRCUIT
ALARM1
ALARM2
OFIE
A1IE
A2IE
WATCHDOG
FT
FREQUENCY TEST
OUTPUT DRIVER
8-BIT COUNTER
SQUARE WAVE
OUT
TIE
SQWE
8 BITS OF OTP
USER SRAM (7 Bytes)
INTERNAL
POWER
VBAT
VRST/VSO(2) ^COMPARE
trec
TIMER
1. Open drain output
2. V_RST = V_SO = 2.93V (S), 2.63V (R), and 2.32V (Z).
M41T82 M41T83
IRQ2(1)
IRQ1/FT/OUT(1)
SQW
RST(1)
AI11800
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