LP5009 datasheet(21/52 Pages) TI2

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Table 8-2. Slave-Address Combinations

ADDR1

ADDR0

SLAVE ADDRESS

INDEPENDENT

BROADCAST

GND

0010100

0001100

GND

VCC

0010101

VCC

GND

0010110

VCC

0010111

Table 8-3. Chip Address

SLAVE ADDRESS

R/ W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Independent

ADDR1

ADDR0

1 or 0

Broadcast

1 or 0

8.5.1.5 Control-Register Write Cycle

• The master device generates a start condition.

• The master device sends the slave address (7 bits) and the data direction bit (R/ W = 0).

• The slave device sends an acknowledge signal if the slave address is correct.

• The master device sends the control register address (8 bits).

• The slave device sends an acknowledge signal.

• The master device sends the data byte to be written to the addressed register.

• The slave device sends an acknowledge signal.

• If the master device sends further data bytes, the control register address of the slave is incremented by 1

after the acknowledge signal. To reduce program load time, the device supports address auto incrementation.

The register address is incremented after each 8 data bits.

• The write cycle ends when the master device creates a stop condition.

star t

MSB Chip Addr LSB

MSB Register Ad dr L SB

ack

MSB Data L SB

ack from slave

ack

stop

Figure 8-11. Write Cycle

8.5.1.6 Control-Register Read Cycle

• The master device generates a start condition.

• The master device sends the slave address (7 bits) and the data direction bit (R/ W = 0).

• The slave device sends an acknowledge signal if the slave address is correct.

• The master device sends the control register address (8 bits).

• The slave device sends an acknowledge signal.

• The master device generates a repeated-start condition.

• The master device sends the slave address (7 bits) and the data direction bit (R/ W = 1).

• The slave device sends an acknowledge signal if the slave address is correct.

• The slave device sends the data byte from the addressed register.

• If the master device sends an acknowledge signal, the control-register address is incremented by 1. The

slave device sends the data byte from the addressed register. To reduce program load time, the device

supports address auto incrementation. The register address is incremented after each 8 data bits.

• The read cycle ends when the master device does not generate an acknowledge signal after a data byte and

generates a stop condition.

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LP5009, LP5012

SLVSEH2B – MAY 2019 – REVISED AUGUST 2020

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