24AA02UID datasheet(6/30 Pages) MICROCHIP

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24AA02UID/24AA025UID

DS20005202A-page 6

 2013 Microchip Technology Inc.

2.0

PIN DESCRIPTIONS

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

TABLE 2-1:

PIN FUNCTION TABLE

2.1

Serial Address/Data Input/Output

(SDA)

SDA is a bidirectional pin used to transfer addresses

and data into and out of the device. Since it is an open-

drain terminal, the SDA bus requires a pull-up resistor

to VCC (typical 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 Start and Stop conditions.

2.2

Serial Clock (SCL)

The SCL input is used to synchronize the data transfer

to and from the device.

2.3

A0, A1, A2 Chip Address Inputs

The A0, A1 and A2 pins are not used by the

24AA02UID. They may be left floating or tied to either

VSS or VCC.

For the 24AA025UID, the levels on the A0, A1 and A2

inputs are compared with the corresponding bits in the

slave address. The chip is selected if the compare is

true. For the 6-lead SOT-23 package, pin A2 is not con-

nected and its corresponding bit in the slave address

should always be set to ‘0’.

Up to eight 24AA025UID devices (four for the SOT-23

package) may be connected to the same bus by using

different Chip Select bit combinations. These inputs

must be connected to either VSS or VCC.

Name

PDIP

SOIC

5-Pin SOT-23

6-Pin SOT-23

Description

—

Chip Address Input(1)

—

Chip Address Input(1)

—

Chip Address Input(1)

VSS

Ground

SDA

Serial Address/Data I/O

SCL

Serial Clock

—

Not Connected

VCC

+1.7V to 5.5V Power Supply

Note 1:

Chip address inputs A0, A1 and A2 are not connected on the 24AA02UID.

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