IC-HT datasheet(22/42 Pages) ICHAUS

22 / 42 page

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iC-HT

DUAL CW LASER DIODE DRIVER

Rev A1, Page 22/42

I²C slave interface

The I²C slave interface is enabled by setting pin

INS/WKR to hi and uses pins NCS/A1, SCLK/SCL,

MISO/SDA and MOSI/A0. The protocol frames are

shown in ﬁgure 11.

A communication frame consists of one slave address

byte, one register address byte and at least one data

byte. Bits 7:1 of the slave address byte form the slave

identiﬁcation code (ID) and bit 0 is used for speciﬁca-

tion of the data direction (0 for write, 1 for read). The

slave ID consists of 7 bits. The ﬁve most signiﬁcant bits

are ﬁxed by default to value 0b11000. Pins MOSI/A0

and NCS/A1 are used to set the remaining slave ID

bits (see table 43 and 44).

Action

Write to slave

Read from slave

Table 43: I²C write/read byte

Action

Slave ID

Address byte

Write to slave 0

0x60

0xC0

Read from slave 0

0x60

0xC1

Write to slave 1

0x61

0xC2

Read from slave 1

0x61

0xC3

Write to slave 2

0x62

0xC4

Read from slave 2

0x62

0xC5

Write to slave 3

0x63

0xC6

Read from slave 3

0x63

0xC7

Table 44: I²C write/read address

A1:A0

Slave ACK

WR='0'

Addr. MSB first

Start

Stop

Addr. MSB first

Start

SCL

Slave ACK

I2C WRITE COMMAND FRAME.

A1:A0

RD='1'

Data 1

Slave ACK

Data 1

Data 2

Slave ACK

Data 1

SCL

Master ACK

Data 2

Stop

Data n

A1:A0

WR='0'

Repeated Start

Data n

Slave ACK

SDA

I2C READ COMMAND FRAME.

SDA

Figure 11: I²C read and write commands

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