MCP7940N-ESLASHMS datasheet(25/58 Pages) MICROCHIP

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DS20005010J-page 25

MCP7940N

5.5

Output Configurations

The MCP7940N features Square Wave Clock Output,

Alarm Interrupt Output, and General Purpose Output

modes. All of the output functions are multiplexed onto

MFP according to Table 5-7.

Only the alarm interrupt outputs are available while

operating from the backup power supply. If none of the

output functions are being used, the MFP can safely be

left floating.

TABLE 5-7:

MFP OUTPUT MODES

FIGURE 5-7:

MFP OUTPUT BLOCK DIAGRAM

Note:

The MFP is an open-drain output and

requires a pull-up resistor to VCC (typically

10 k

).

SQWEN ALM0EN ALM1EN

Mode

000

General Purpose

Output

010

Alarm Interrupt

Output

001

011

1xx

Square Wave Clock

Output

Oscillator

EXTOSC

32.768 kHz

8.192 kHz

4.096 kHz

1 Hz

SQWFS<1:0>

Digital

Trim

64 Hz

CRSTRIM

MFP

SQWEN

ALM1IF

ALM0IF

ALMPOL

ALM1EN,ALM0EN

OUT

MCP7940N

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