Datasheet

MCP7941X

DS22266A-page 6 Preliminary  2010 Microchip Technology Inc.

2.0 PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

FIGURE 2-1: DEVICE PINOUTS

2.1 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 V

CC (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.

2.2 Serial Clock (SCL)

This input is used to synchronize the data transfer from

and to the device.

TABLE 2-1: PIN DESCRIPTIONS

Pin Name Pin Function

Vss Ground

SDA Bidirectional Serial Data

SCL Serial Clock

X1 Xtal Input, External Oscillator Input

X2 Xtal Output

BAT Battery Backup Input (3V Typ)

MFP Multi Function Pin

Vcc +1.8V to +5.5V Power Supply

BAT

Vss

Vcc

MFP

SCL

SDA

SOIC/DFN/MSOP/TSSOP