MSM62X42B 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM62X42B

REAL TIME CLOCK IC WITH BUILT-IN CRYSTAL

Oki Electric Industry 

¡ Semiconductor

APPLICATION NOTE

Power Supply

Start

Power On

TEST bit ¨ 0

REST bit ¨ 1

24/12 bit ¨ *1

STOP bit ¨ 1

REST bit ¨ 0

24/12 bit ¨ *2

Set the current Time

HOLD bit ¨ 0

STOP bit ¨ 0

Start Operation

MSM62X42B

VDD= 0 to VDD= 5V

All registers and STD,P

output=undefined

*1=*2(=1 or 0)

Pattern Layout

The oscillation circuit of 32.768kHz consists of high impedance in the oscillation stage to

realize the minimum current consumption. In addition, it is a feature that the time when the

oscillation waveform passes the threshold vicinity is long. For this reason, the power supply

anti-noise by the same method as an analog IC must be considered. As an actual example,

set a tantalum capacitor (4.7µF) and a ceramic capacitor (0.01µF) near this IC. In case that an

another IC, for instance, RAM for backup, exists in battery backup circuit, set a bypass

capacitor close to it.

Maximum value of allowable power supply noise should be 300mV.

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