M41ST95W datasheet(20/35 Pages) STMICROELECTRONICS

20 / 35 page

M41ST95Y*, M41ST95W

20/35

Square Wave Output

The M41ST95Y/W offers the user a programma-

ble square wave function which is output on the

SQW pin. RS3-RS0 bits located in 13h establish

the square wave output frequency. These fre-

quencies are listed in Table 6. Once the selection

of the SQW frequency has been completed, the

SQW pin can be turned on and off under software

control with the Square Wave Enable Bit (SQWE)

located in Register 0Ah.

Table 6. Square Wave Output Frequency

Full-time F32k Square Wave Output

(Available only in 28-pin, 300mil SOIC (MX) package).

The M41ST95Y/W offers the user a special 32kHz

square wave function which is always output on

the F32k pin (Pin 21) as long as VCC ≥ VSO, 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 ST Bit to

'1,' or while the device is in back-up. If not used,

the F32k pin should be disconnected and allowed

to float.

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

008

014

102

111

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