S-24C02DI-J8T1U5 Datasheet, PDF (21/47 Pages) Seiko Instruments Inc – Write protect function during low power supply voltage

Rev.3.0_01_U
2-WIRE SERIAL E²PROM
S-24C02D/04D/08D16D
 Usage
1. A pull-up resistor to SDA I/O pin and SCL input pin
In consideration of I²C-bus protocol function, the SDA I/O pin should be connected with a pull-up resistor. This IC
cannot transmit normally without using a pull-up resistor.
In case that the SCL input pin of this IC 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 this IC 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-Z". This prevents this IC
from error caused by an uncertain output (High-Z) from the tri-state pin when resetting the master device during the
voltage drop.
2. Equivalent circuits of input pin and I/O pin
The SCL pin and the SDA pin of this IC does not have a built-in pull-down or pull-up resistor. Each of A0 pin, A1 pin,
A2 pin and WP pin has a built-in pull-down resistor. The SDA pin is an open-drain output. The followings are
equivalent circuits of the pins.
SCL
SDA
Figure 16 SCL Pin
WP
Figure 17 SDA Pin
A0, A1, A2
Figure 18 WP Pin
Figure 19 A0, A1, A2 Pin
Remark In the S-24C04D/08D/16D, A0 pin is not available.
In the S-24C08D/16D, A1 pin is not available.
In the S-24C16D, A2 pin is not available.
The A0 pin, the A1 pin and the A2 pin are no connection in the product with SOT-23-5 package.
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