M41T82 datasheet(29/64 Pages) STMICROELECTRONICS

Part #	M41T82

Description	Serial I2C bus real-time clock (RTC) with battery switchover

PDF	64 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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29 / 64 page

DocID012578 Rev 19

29/64

M41T82, M41T83

Clock operation

the digital calibration circuitry uses periodic counter correction which occurs downstream of

the 512 Hz divider chain and hence has no effect on the FT pin.

Note:

The modified pulses are not observable on the frequency test (FT) output, nor will the effect

of the calibration be measurable real-time, due to the periodic nature of the error

compensation.

Positive digital calibration is performed on an eight minute cycle, therefore the value in the

calibration register should not be modified more frequently than once every eight minutes

for positive values of calibration. Negative digital calibration is performed on a sixteen

minute cycle, therefore negative values in the calibration register should not be modified

more frequently than once every sixteen minutes.

M41T82 Datasheet(PDF) 29 Page - STMicroelectronics