s-24c02ci-t8t1u Seiko Instruments Inc., s-24c02ci-t8t1u Datasheet - Page 21

• Manufacturer Part Number: s-24c02ci-t8t1u
• Description: 2-wire Cmos Serial E2prom
• Manufacturer: Seiko Instruments Inc.

Rev.2.0
Using S-24C01C/02C
1. Adding a pull-up resistor to SDA I/O pin and SCL input pin
2. Equivalent circuit of I/O pin
In consideration of I
The S-24C01C/02C cannot transmit normally without using a pull-up resistor.
In case that the SCL input pin of the S-24C01C/02C 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 E
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-24C01C/02C from error caused by an uncertain output (high impedance) from the tri-
state pin when resetting the master device during the voltage drop.
Each pin (SCL, SDA, A0, A1, A2) of the S-24C01C/02C does not have a built-in pull-down or pull-up resistor. The WP
pin includes a pull-down resistor. The SDA line has an open-drain output. The followings are equivalent circuits of the
pins.
_00_C
SDA
SCL
2
C-bus protocol function, the SDA I/O pins should be connected with a pull-up resistor.
Seiko Instruments Inc.
Figure 24 SCL Pin
Figure 25 SDA Pin
2-WIRE CMOS SERIAL E
2
PROM is connected to
S-24C01C/02C
2
PROM
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