PCA85176(2010) Ver la hoja de datos (PDF) - NXP Semiconductors.
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PCA85176 Datasheet PDF : 44 Pages
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NXP Semiconductors
PCA85176
Universal LCD driver for low multiplex rates
SDA
SDA
SCL
S
START condition
Fig 13. Definition of START and STOP conditions
P
STOP condition
SCL
mbc 622
7.16.3 System configuration
A device generating a message is a transmitter, a device receiving a message is the
receiver. The device that controls the message is the master and the devices which are
controlled by the master are the slaves (see Figure 14).
MASTER
TRANSMITTER /
RECEIVER
SDA
SCL
SLAVE
RECEIVER
Fig 14. System configuration
SLAVE
TRANSMITTER /
RECEIVER
MASTER
TRANSMITTER
MASTER
TRANSMITTER /
RECEIVER
mga807
7.16.4 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 15.
PCA85176_1
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 01 — 14 April 2010
© NXP B.V. 2010. All rights reserved.
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