MCP7940NT datasheet(6/36 Pages) MICROCHIP

Part #	MCP7940NT

Description	Low-Cost I2C??Real-Time Clock/Calendar with SRAM and Battery Switchover

PDF	36 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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6 / 36 page

MCP7940N

DS25010A-page 6

 2011 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 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.

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

Xtal Input, External Oscillator Input

Xtal Output

VBAT

Battery Backup Input (3V Typ)

MFP

Multi Function Pin

Vcc

+1.8V to +5.5V Power Supply

VBAT

Vss

Vcc

MFP

SCL

SDA

SOIC/DFN/MSOP/TSSOP

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