PCF8820 datasheet(15/60 Pages) PHILIPS

15 / 60 page

2000 Dec 07

Philips Semiconductors

Product speciﬁcation

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LCD driver

PCF8820

7.18

I2C-bus interface

The I2C-bus allows bidirectional data communication

between different ICs or modules. The serial data input line

and serial data output line are connected together, so

representing the Serial Data (SDA) line. See Section 13.4

for layout considerations. The SDA line and the Serial

Clock Line (SCL) line must be connected to a positive

supply voltage via a pull-up resistor. Data transfer may be

initiated only when the bus is not busy.

7.18.1

BIT TRANSFER

One data bit is transferred during a clock pulse period. The

data on the SDA line must remain stable during the HIGH

period of the clock pulse, otherwise any change in the data

within this period will be interpreted as a control signal

(see Fig.11).

7.18.2

START AND STOP CONDITIONS

Both data and clock lines are HIGH when the bus is not

busy (see Fig.12).

A START condition (S) occurs when the data line goes

from HIGH-to-LOW while the clock is HIGH.

A STOP condition (P) occurs when the data line goes from

LOW-to-HIGH while the clock is HIGH.

handbook, full pagewidth

MBC621

data line

stable;

data valid

change

of data

allowed

SDA

SCL

Fig.11 Bit transfer.

handbook, full pagewidth

MBC622

SDA

SCL

STOP condition

SDA

SCL

START condition

Fig.12 Definition of START and STOP conditions.

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