PCA8581 데이터 시트보기 (PDF) - Philips Electronics

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PCA8581

128 × 8-bit EEPROM with I2C-bus interface

Philips Electronics 

Philips Semiconductors

128 × 8-bit EEPROM with I2C-bus interface

Product specification

PCA8581; PCA8581C

7 CHARACTERISTICS OF THE I2C-BUS

The I2C-bus is for bidirectional, two-line communication

between different ICs or modules. The two lines are a

serial data line (SDA) and a serial clock line (SCL). Both

lines must be connected to a positive supply via a pull-up

resistor. Data transfer may be initiated only when the bus

is not busy.

7.1 Bit transfer

One data bit is transferred during each clock pulse.

The data on the SDA line must remain stable during the

HIGH period of the clock pulse as changes in the data line

at this time will be interpreted as a control signal.

SDA

SCL

data line

stable;

data valid

change

of data

allowed

MBA607

Fig.3 Bit transfer.

7.2 Start and stop conditions

Both data and clock lines remain HIGH when the bus is not busy. A HIGH-to-LOW transition of the data line, while the

clock is HIGH is defined as the start condition (S). A LOW-to-HIGH transition of the data line while the clock is HIGH is

defined as the stop condition (P).

SDA

SCL

S

START condition

SDA

SCL

P

STOP condition

MBA608

Fig.4 Definition of START and STOP conditions.

1997 Apr 02

5

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