CMOS 2-WIRED SERIAL EEPROM

S-24C01A/02A/04A

6

Seiko Instruments Inc.

Table 10

Item

Symbol

Min.

Typ.

Max.

Min.

Typ.

Max.

Unit

Write time

—

0.8

1.0

—

4.0

5.0

ms

Pin Functions

1. Address Input Pins (A0, A1, and A2)

Connect pins A0, A1, and A2 to the GND or the V

different ways to assign slave addresses in the S-24C01A and S-24C02A through a combination of pins

A0, A1, and A2, and 4 ways to assign them in the S-24C04A through a combination of pins A1 and A2.

When the input slave address coincides with the slave address transmitted from the master device, 1

device can be selected from among multiple devices connected to the bus. Always connect the address

input pin to GND or V

2. SDA (Serial Data Input/Output) Pin

The SDA pin is used for bilateral transmission of serial data. It consists of a signal input pin and an Nch

open-drain transistor output pin.

Usually pull up the SDA line via resistance to the V

output devices connected in a wired OR configuration.

3. SCL (Serial Clock Input) Pin

The SCL pin is used for serial clock input. It is capable of processing signals at the rising and falling edges

of the SCL clock input signal. Make sure the rising time and falling time conform to the specifications.

4. TEST/WP Pin

The S-24C01A does not have a write protection (WP) function. The pin serves as a TEST pin and shoud

always be connect to the GND.

In the S-24C02A and S-24C04A, this pin is used for write protection. When there is no need for write

protection, connect the pin to the GND; when there is a need for write protection, connect the pin to the

Vcc.

Figure 5 Write Cycle

SCL

SDA

D0

Write data

Acknowledge

Stop

condition

Start

condition