M41T65 STMICROELECTRONICS [STMicroelectronics], M41T65 Datasheet - Page 6

• Manufacturer Part Number: M41T65
• Description: Serial real-time clocks with alarm
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Description
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Description
The M41T6x serial access TIMEKEEPER
32.768 kHz oscillator. Eight registers are used for the clock/calendar function and are
configured in binary coded decimal (BCD) format. An additional 8 registers provide
status/control of alarm, 32 KHz output, calibration, and watchdog functions. Addresses and
data are transferred serially via a two line, bi-directional I
register is incremented automatically after each WRITE or READ data byte.
Functions available to the user include a time-of-day clock/calendar, alarm interrupts
(M41T62/65), 32 KHz output (M41T62/63/64), programmable square wave output
(M41T62/63/64), and watchdog output (M41T63/65). The eight clock address locations
contain the century, year, month, date, day, hour, minute, second and tenths/hundredths of a
second in 24 hour BCD format. Corrections for 28-, 29- (leap year), 30- and 31-day months
are made automatically.
The M41T6x is supplied in a tiny, 3 mm x 3 mm 16-pin QFN which requires a user-supplied
32 KHz crystal.
Figure 1.
1. Open drain.
2. Defaults to 32 KHz on power-up.
Figure 2.
1. Open drain.
2. Defaults to 32 KHz on power-up.
M41T62 logic diagram
M41T63 logic diagram
Doc ID 10397 Rev 14
SDA
SDA
SCL
SCL
XO
XO
XI
XI
®
M41T63
M41T62
is a low power serial RTC with a built-in
V
V
V
V
CC
SS
SS
CC
2
C interface. The built-in address
WDO
SQW
SQW
IRQ/OUT
(1)
(2)
(2)
(1)
M41T62/63/64/65
AI09103
AI09189