S-24C32CH 데이터 시트보기 (PDF) - Seiko Instruments Inc

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S-24C32CH

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE SERIAL E2PROM

Seiko Instruments Inc 

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE SERIAL E2PROM

S-24C32C/64C H Series

Rev.2.1_01_H

 Using S-24C32C/64C

1. Adding a pull-up resistor to SDA I/O pin and SCL input pin

In consideration of I2C-bus protocol function, the SDA I/O pins should be connected with a pull-up resistor.

The S-24C32C/64C cannot transmit normally without using a pull-up resistor.

In case that the SCL input pin of the S-24C32C/64C is connected to the Nch open drain output pin of the master

device, connect the SCL pin with a pull-up resistor. As well, in case the SCL input pin of the S-24C32C/64C is

connected to the tri-state output pin of the master device, connect the SCL pin with a pull-up resistor in order not to

set it in high impedance. This prevents the S-24C32C/64C from error caused by an uncertain output (high

impedance) from the tri-state pin when resetting the master device during the voltage drop.

2. Equivalent circuit of input and I/O pin

The S-24C32C/64C does not have a built-in pull-down or pull-up resistor for the SCL and SDA pins. The WP, A2, A1

and A0 pins have a pull-down resistor. The SDA pin has an open-drain output. The followings are equivalent circuits

of the pins.

SCL

SDA

Figure 20 SCL Pin

Figure 21 SDA Pin

20

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