SC18IS601IPW datasheet(13/30 Pages) NXP

13 / 30 page

SC18IS600_601_5

Product data sheet

Rev. 05 — 28 July 2008

13 of 30

NXP Semiconductors

SC18IS600/601

SPI to I2C-bus interface

6.6 SPI message format

6.6.1 Write N bytes to I2C-bus slave device

The SPI host issues the write command by sending a 0x00 command followed by the total

number of bytes (maximum 96 bytes excluding the address) to send and an I2C-bus slave

device address followed by I2C-bus data bytes, beginning with the ﬁrst byte (data byte 1)

and ending with the last byte (data byte N). Once the SPI host issues this command, the

SC18IS600/601 will access the I2C-bus slave device and start sending the I2C-bus data

bytes.

When the I2C-bus write transaction has successfully ﬁnished, and interrupt is generated

on the INT pin, and the ‘transaction completed’ status can be read in I2CStat.

Note that the third byte sent by the host is the device I2C-bus slave address. The

SC18IS600/601 will ignore the least signiﬁcant bit so a write will always be performed

even if the least signiﬁcant bit is a ‘1’.

Fig 12. SPI single master multiple slaves conﬁguration

002aab717

master

MISO

MOSI

SPICLK

PORT

slave

SCLK

SC18IS600/601

slave

SCLK

OTHER SPI

DEVICE

Fig 13. Write N bytes to I2C-bus slave device

002aab718

NUMBER

OF BYTES

0x00

COMMAND

SLAVE ADDRESS

+ W

SPI host sends

DATA

BYTE 1

DATA

BYTE N

SCLK

MOSI

data byte 1

data byte N

slave address A[7:1]

number of bytes D[7:0]

command 0x00

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