s-24cs64a Seiko Instruments Inc., s-24cs64a Datasheet - Page 19

• Manufacturer Part Number: s-24cs64a
• Description: 2-wire Cmos Serial E2prom
• Manufacturer: Seiko Instruments Inc.

Rev.4.1
1. Adding a pull-up resistor to SDA I/O pin and SCL input pin
2. I/O pin equivalent circuit
Using S-24CS64A
Add a 1 to 5 k Ω pull-up resistor to the SCL input pin
of the I
*1. When the SCL input pin of the E
The I/O pins of this IC do not include pull-up and pull-down resistors. The SDA pin is an open-drain output.
The following shows the equivalent circuits.
connect the same pull-up resistor to prevent a high impedance status from being input to the SCL
input pin.
This protects the E
state pin when the microprocessor is reset when the voltage drops.
_00
2
C-bus protocol. Normal communication cannot be provided without a pull-up resistor.
SCL
SDA
2
PROM from malfunction due to an undefined output (high impedance) from the tri-
2
PROM is connected to a tri-state output pin of the microprocessor,
Seiko Instruments Inc.
Figure 22 SDA Pin
Figure 21 SCL Pin
*1
and the SDA I/O pin in order to enable the functions
2-WIRE CMOS SERIAL E
S-24CS64A
2
PROM
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