M41T00 Datasheet, PDF (1/15 Pages) STMicroelectronics – Serial Access TIMEKEEPER

M41T00
Serial Access TIMEKEEPER^®
s 2.0V to 5.5V SUPPLY VOLTAGE
s COUNTERS for SECONDS, MINUTES,
HOURS, DAY, DATE, MONTH, YEARS and
CENTURY
s YEAR 2000 COMPLIANT
s SOFTWARE CLOCK CALIBRATION
s AUTOMATIC SWITCH-OVER and DESELECT
CIRCUITRY
s I²C BUS COMPATIBLE
s ULTRA-LOW BATTERY SUPPLY CURRENT
of 1µA
s LOW OPERATING CURRENT of 300µA
s OPERATING TEMPERATURE of –40 to 85°C
s AUTOMATIC LEAP YEAR COMPENSATION
s SPECIAL SOFTWARE PROGRAMMABLE
OUTPUT
DESCRIPTION
The M41T00 TIMEKEEPER^® RAM is a low power
Serial TIMEKEEPER with a built-in 32.768kHz os-
cillator (external crystal controlled). Eight bytes of
the RAM are used for the clock/calendar function
and are configured in binary coded decimal (BCD)
format. Addresses and data are transferred serial-
ly via a two-line bi-directional bus. The built-in ad-
dress register is incremented automatically after
each write or read data byte.
Table 1. Signal Names
OSCI
Oscillator Input
OCSO
Oscillator Output
FT/OUT
Frequency Test / Output Driver
(Open Drain)
SDA
Serial Data Address Input / Output
SCL
Serial Clock
V_BAT
Battery Supply Voltage
V_CC
Supply Voltage
V_SS
Ground
May 2000
8
1
SO8 (M)
150mil Width
Figure 1. Logic Diagram
VCC VBAT
OSCI
SCL
M41T00
VSS
OSCO
SDA
FT/OUT
AI00530
1/15