24AA02H-ESLASHMS datasheet(5/30 Pages) MICROCHIP

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DS22105A-page 5

24AA02H/24LC02BH

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

The A0, A1 and A2 pins are not used by the 24XX02H.

They may be left floating or tied to either VSS or VCC.

2.2

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

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)

The WP pin must be connected to either VSS or VCC.

If tied to VSS, normal memory operation is enabled

(read/write the entire memory

00-FF).

If tied to VCC, write operations are inhibited. Half of the

memory will be write-protected (80h-FFh). Read

operations are not affected.

Name

PDIP

SOIC

TSSOP

DFN

MSOP

SOT23

SC-70

Description

111

—

Not Connected

222

—

Not Connected

333

—

Not Connected

VSS

44422

Ground

SDA

55533

Serial Address/Data I/O

SCL

66611

Serial Clock

77755

Write-Protect Input

VCC

88844

+1.7V to 5.5V Power

Supply

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