M41T00S_08 STMICROELECTRONICS [STMicroelectronics], M41T00S_08 Datasheet - Page 5

• Manufacturer Part Number: M41T00S_08
• Description: Serial access real-time clock
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

1
Description
The M41T00S Serial Access TIMEKEEPER
in 32.768 kHz oscillator (external crystal controlled). Eight bytes of the SRAM (see
on page
decimal (BCD) format. Addresses and data are transferred serially via a two line,
bidirectional I
each WRITE or READ data byte.
The M41T00S has a built-in power sense circuit which detects power failures and
automatically switches to the battery supply when a power failure occurs. The energy
needed to sustain the clock operations can be supplied by a small lithium button supply
when a power failure occurs. The eight clock address locations contain the century, year,
month, date, day, hour, minute, and second in 24-hour BCD format. Corrections for 28, 29
(leap year - valid until year 2100), 30 and 31 day months are made automatically.
The M41T00S is supplied in an 8-pin SOIC.
Figure 1.
Table 1.
13) are used for the clock/calendar function and are configured in binary coded
FT/OUT
V
SDA
SCL
V
V
XO
XI
BAT
CC
SS
Logic diagram
Signal names
2
C interface. The built-in address register is incremented automatically after
Oscillator input
Oscillator output
Frequency test / output driver (open drain)
Serial data input/output
Serial clock input
Battery supply voltage
Supply voltage
Ground
SDA
SCL
XO
XI
V CC
M41T00S
V SS
V BAT
®
SRAM is a low power serial RTC with a built-
FT/OUT
AI09165
Table 2
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