M41T93 datasheet(23/56 Pages) STMICROELECTRONICS

Part #	M41T93

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

PDF	56 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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23 / 56 page

DocID12615 Rev 8

23/56

M41T93

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.

M41T93 Datasheet(PDF) 23 Page - STMicroelectronics