24LC32AF-ESLASHST datasheet(5/30 Pages) MICROCHIP

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DS22184A-page 5

24AA32AF/24LC32AF

2.0

PIN DESCRIPTIONS

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

TABLE 2-1:

PIN FUNCTION TABLE

2.1

A0, A1, A2 Chip Address Inputs

The A0, A1 and A2 inputs are used by the 24XX32AF

for multiple device operation. The levels on these

inputs are compared with the corresponding bits in the

slave address. The chip is selected if the comparison is

true.

Up to eight devices may be connected to the same bus

by using different Chip Select bit combinations. These

inputs must be connected to either VCC or VSS.

In most applications, the chip address inputs A0, A1

and A2 are hard-wired to logic ‘0’ or logic ‘1’. For

applications in which these pins are controlled by a

microcontroller or other programmable device, the chip

address pins must be driven to logic ‘0’ or logic ‘1’

before normal device operation can proceed. Address

pins are not available in the SOT-23 package.

2.2

Serial Data (SDA)

SDA 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 (typical 10 k

Ω for 100 kHz, 2 kΩ for

400 kHz)

For normal data transfer, SDA is allowed to change

only during SCL low. Changes during SCL high are

reserved for indicating Start and Stop conditions.

2.3

Serial Clock (SCL)

The SCL input is used to synchronize the data transfer

to and from the device.

2.4

Write-Protect (WP)

This pin must be connected to either VSS or VCC. If tied

to VSS, write operations are enabled. If tied to VCC,

write operations are inhibited for the upper 1/4 of the

array (C00h-FFFh), but read operations are not

affected.

Name

PDIP

SOIC

TSSOP

TDFN

MSOP

SOT-23

Description

—

Chip Address Input

—

Chip Address Input

—

Chip Address Input

VSS

Ground

SDA

Serial Address/Data I/O

SCL

Serial Clock

Write-Protect Input

VCC

+1.7V to 5.5V Power Supply

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