M41T66Q6F STMicroelectronics, M41T66Q6F Datasheet - Page 5

• Manufacturer Part Number: M41T66Q6F
• Description: IC RTC SERIAL W/ALARM 16-QFN
• Manufacturer: STMicroelectronics
• Type: Clock/Calendar/Alarmr

Specifications of M41T66Q6F

• Memory Size: 16B
• Time Format: HH:MM:SS:hh (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 1.5 V ~ 4.4 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8377-2

M41T66
1
Description
The M41T66 serial access TIMEKEEPER
32.768 kHz oscillator (external crystal controlled). Eight registers (see
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, square wave, calibration,
and watchdog functions. Addresses and data are transferred serially via a two line,
bidirectional I
each WRITE or READ data byte.
Functions available to the user include a time-of-day clock/calendar, alarm interrupts,
programmable square wave output, and watchdog output. 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 M41T66 is supplied in a 16-pin QFN.
Figure 1.
1. Open drain
2. Defaults to 32 KHz on power-up
M41T66 logic diagram
2
C interface. The built-in address register is incremented automatically after
®
is a low power serial RTC with a built-in
Table 2 on page
Description
15)
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