S-24C16C Datasheet, PDF (20/33 Pages) Seiko Instruments Inc – Write protect function during the low power supply voltage

2-WIRE SERIAL E²PROM
S-24C16C (WLP PRODUCT)
Rev.1.0_00_H
 Using S-24C16C
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-24C16C cannot transmit normally without using a pull-up resistor.
In case that the SCL input pin of the S-24C16C 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-24C16C 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-24C16C from error caused by an uncertain output (high impedance) from the tri-state
pin when resetting the master device during the voltage drop.
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