M41T93_11 Datasheet, PDF (9/51 Pages) STMicroelectronics – Serial SPI bus real-time clock with battery switchover

M41T93
Figure 4. Block diagram
CRYSTAL
E
SDI
SCL
SDO
XI
32KHz
OSCILLATOR
XO
SPI
INTERFACE
WRITE
PROTECT
VCC < VR_ST
VCC
VBAT
VR_ST/VSO(2) ^COMPARE
REAL TIME CLOCK
CALENDAR
OSCILLATOR FAIL
CIRCUIT
ALARM1
ALARM2
OFIE
A1IE
WATCHDOG
FT
FREQUENCY TEST
OUTPUT DRIVER
8-BIT COUNTER
SQUARE WAVE
OUT
TIE
SQWE
8 BITS OF OTP
USER SRAM (7 Bytes)
INTERNAL
POWER
trec
TIMER
1. Open drain output
2. V_RST = V_SO = 2.93 V (S), 2.63 V (R), and 2.32 V (Z)
Description
IRQ/FT/OUT(1)
SQW
RST(1)
AI11821
Doc ID 12615 Rev 6
9/51