ICS1531 datasheet(54/76 Pages) ICST

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ICS1531 Rev N 12/1/99

December, 1999

Chapter 7

Programming

ICS1531 Data Sheet - Preliminary

Chapter 7

Programming

7.1

Industry-Standard 2-Wire Serial Bus: Data Format

Figure 7-1 shows the data format for an industry-standard 2-wire serial bus.

Note:

All values are transmitted with the most-significant bit (MSB) first and the least-significant bit (LSB) last.

A dashed line

means multiple transactions.

A = ACK = Acknowledge

R = Read = 1

S = Start

W = Write = 0

X = Bit value that equals the logic state of the SBADR pin.

Direction:

Figure 7-1.

ICS1531 Data Format for Industry-Standard 2-Wire Serial Bus

Note 1: For the register address, the:

• Lower nibble automatically increments after each successive data byte is written to or read from the

ICS1531.

• Upper nibble does not automatically increment, and the software must explicitly re-address the ICS1531.

As a result, to write or read all the ICS1531 registers, the software:

– Must not index 0 and then do 64 one-byte transactions.

– Must break the transactions into four separate bus transactions:

(1) 00 to 0F (2) 10 to 1F (3) 20 to 2F (4) 30 to 3F

ICS1531 drives signal to master device

Master device drives signal to ICS1531

MSB

LSB

0 1001 0 X W A

A Stop

7-bit address

Reg address

Data

Read Procedure for Single Register

MSB

LSB

MSB

LSB

0 1001 0 X W A

A S 0

1 0 0 1 0 X

A Stop

7-bit address

Reg address

7-bit address

Data

Repeat START

NO Acknowledge

Write Procedure for Multiple Registers (Note 1)

MSB

LSB

0 1001 0 X W A

A Stop

7-bit address

Reg address

Data

Read Procedure for Multiple Registers (Note 1)

MSB

LSB

MSB

LSB

0 1001 0 X W A

A S 0

1 0 0 1 0 X

Stop

7-bit address

Reg address

7-bit address

Data

Repeat START

NO Acknowledge

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