M41T80 datasheet(15/20 Pages) STMICROELECTRONICS

Part #	M41T80

Description	SERIAL ACCESS RTC WITH ALARMS

PDF	20 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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15 / 20 page

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M41T80

Table 10. Square Wave Output Frequency

Full-time 32kHz Square Wave Output

The M41T80 offers the user a special 32kHz

square wave function which defaults to output on

the F32k pin (Pin 3) as long as VCC is valid, and the

oscillator is running (ST Bit = '0'). This function is

available within four seconds of initial power-up

and can only be disabled by setting the 32kE Bit to

'0' or the ST Bit to '1.' If not used, the F32k pin

should be disconnected and allowed to float.

Note: The F32k pin is an open drain which requires

an external pull-up resistor.

Square Wave Bits

Square Wave

RS3

RS2

RS1

RS0

Frequency

Units

None

32.768

kHz

8.192

kHz

4.096

kHz

2.048

kHz

1.024

kHz

512

256

128

M41T80 Datasheet(PDF) 15 Page - STMicroelectronics