MCP79402 datasheet(6/38 Pages) MICROCHIP

部件名	MCP79402

功能描述	I2C??Real-Time Clock/Calendar with SRAM, Unique ID and Battery Switchover

PDF	38 Pages

Scroll/Zoom	100%

制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

标志

6 / 38 page

MCP7940X

DS25009A-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

MCP79402 数据表(PDF) 6 Page - Microchip Technology

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