PCF85134 datasheet(21/40 Pages) NXP

21 / 40 page

PCF85134_1

Product data sheet

Rev. 01 — 17 December 2009

21 of 40

NXP Semiconductors

PCF85134

Universal LCD driver for low multiplex rates

8.1.3 Acknowledge

The number of data bytes transferred between the START and STOP conditions from

transmitter to receiver is unlimited. Each byte of eight bits is followed by an acknowledge

cycle.

• A slave receiver, which is addressed, must generate an acknowledge after the

reception of each byte.

• A master receiver must generate an acknowledge after the reception of each byte that

has been clocked out of the slave transmitter.

• The device that acknowledges must pull-down the SDA line during the acknowledge

clock pulse, so that the SDA line is stable LOW during the HIGH period of the

acknowledge related clock pulse (set-up and hold times must be taken into

consideration).

• A master receiver must signal an end of data to the transmitter by not generating an

acknowledge on the last byte that has been clocked out of the slave. In this event, the

transmitter must leave the data line HIGH to enable the master to generate a STOP

condition.

Acknowledgement on the I2C-bus is illustrated in Figure 14.

Fig 13. System conﬁguration

mga807

SDA

SCL

MASTER

TRANSMITTER/

RECEIVER

MASTER

TRANSMITTER

SLAVE

TRANSMITTER/

RECEIVER

SLAVE

RECEIVER

MASTER

TRANSMITTER/

RECEIVER

Fig 14. Acknowledgement of the I2C-bus

mbc602

START

condition

clock pulse for

acknowledgement

not acknowledge

acknowledge

data output

by transmitter

data output

by receiver

SCL from

master

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