MCP7940N-ESLASHST datasheet(7/42 Pages) MICROCHIP

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DS25010E-page 7

MCP7940N

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN DESCRIPTIONS

FIGURE 3-1:

DEVICE PINOUTS

3.1

Serial Data (SDA)

This is a bidirectional pin used to transfer addresses

and data into and out of the device. It is an open-drain

terminal, therefore, the SDA bus requires a pull-up

resistor to VCC (typically 10 k

 for 100 kHz, 2 k for

400 kHz). For normal data transfer, SDA is allowed to

change only during SCL low. Changes during SCL high

are reserved for indicating the Start and Stop

conditions.

3.2

Serial Clock (SCL)

This input is used to synchronize the data transfer from

and to the device.

3.3

X1, X2

External Crystal Pins.

3.4

MFP

Open-drain pin used for alarm and clock-out.

3.5

VBAT

Input for backup supply to maintain RTCC and SRAM

during the time when VCC is below VTRIP.

Pin Name

Pin Function

Vss

Ground

SDA

Bidirectional Serial Data

SCL

Serial Clock

Xtal Input, External Oscillator Input

Xtal Output

VBAT

Battery Backup Input (3V Typ)

MFP

Multi-Function Pin

Vcc

Power Supply

VBAT

Vss

Vcc

MFP

SCL

SDA

SOIC/DFN/MSOP/TSSOP

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