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PCA8591P

8-bit A/D and D/A converter

Philips Electronics 

Philips Semiconductors

8-bit A/D and D/A converter

Product specification

PCF8591

8 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.

8.1 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.

handbook, full pagewidth

SDA

SCL

data line

stable;

data valid

change

of data

allowed

MBC621

Fig.11 Bit transfer.

8.2 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).

handbook, full pagewidth

SDA

SDA

SCL

S

START condition

SCL

P

STOP condition

MBC622

Fig.12 Definition of START and STOP condition.

1998 Jul 02

13

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