34LC02T-ESLASHMS datasheet(7/40 Pages) MICROCHIP

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DS20002029G-page 7

34AA02/34LC02

2.0

PIN DESCRIPTIONS

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

2.1

A0, A1, A2 Chip Address Inputs

The levels on these inputs are compared with the

corresponding bits in the client address. The chip is

selected if the compare is true.

Up to eight 34XX02 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. The A0 pin is

also used to detect VHV.

2.2

Serial Address/Data Input/Output

(SDA)

This is a bidirectional pin used to transfer addresses

and data into and data out of the device. It is an

open-drain terminal. Therefore, the SDA bus requires a

pull-up resistor to VCC (typical 10 k

 for 100 kHz, 2 k

for 400kHz and 1MHz).

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.

2.3

Serial Clock (SCL)

This input is used to synchronize the data transfer to

and from the device.

2.4

Write-Protect (WP)

This is the hardware write-protect pin. It can be tied to

VCC or VSS. If tied to VCC, the hardware write protection

is enabled. If the WP pin is tied to VSS, the hardware

write protection is disabled.

TABLE 2-1:

PIN FUNCTION TABLE

Name

MSOP

PDIP

SOIC

SOT-23

TDFN

TSSOP

Description

Chip Address Input

—

Chip Address Input

VSS

Ground

SDA

Serial Address/Data I/O

SCL

Serial Clock

—

Write-Protect Input

VCC

Power Supply

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