LP8545 datasheet(25/44 Pages) TI1

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LP8545

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SNVS635D – APRIL 2010 – REVISED DECEMBER 2013

Control Register Write Cycle

•

Master device generates start condition.

•

Master device sends slave address (7 bits) and the data direction bit (r/w = 0).

•

Slave device sends acknowledge signal if the slave address is correct.

•

Master sends control register address (8 bits).

•

Slave sends acknowledge signal.

•

Master sends data byte to be written to the addressed register.

•

Slave sends acknowledge signal.

•

If master will send further data bytes the control register address will be incremented by one after

acknowledge signal.

•

Write cycle ends when the master creates stop condition.

Control Register Read Cycle

•

Master device generates a start condition.

•

Master device sends slave address (7 bits) and the data direction bit (r/w = 0).

•

Slave device sends acknowledge signal if the slave address is correct.

•

Master sends control register address (8 bits).

•

Slave sends acknowledge signal.

•

Master device generates repeated start condition.

•

Master sends the slave address (7 bits) and the data direction bit (r/w = 1).

•

Slave sends acknowledge signal if the slave address is correct.

•

Slave sends data byte from addressed register.

•

If the master device sends acknowledge signal, the control register address will be incremented by one. Slave

device sends data byte from addressed register.

•

Read cycle ends when the master does not generate acknowledge signal after data byte and generates stop

condition.

Table 1. Data Read and Write Cycles

Address Mode

<Slave Address><r/w = 0>[Ack]

<Register Addr.>[Ack]

Data Read

<Slave Address><r/w = 1>[Ack]

[Register Data]<Ack or NAck>

… additional reads from subsequent register address possible

<Slave Address><r/w=’0’>[Ack]

<Register Addr.>[Ack]

Data Write

<Register Data>[Ack]

… additional writes to subsequent register address possible

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