IC-HTP datasheet(26/51 Pages) ICHAUS

26 / 51 page

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iC-HTP

DUAL CW P-TYPE LASER DIODE DRIVER

Rev B1, Page 26/51

SERIAL COMMUNICATION INTERFACES

SPI slave interface

The SPI slave interface is enabled by setting pin

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

MISO/SDA and MOSI/A0. Pin NCS/A1 is the chip se-

lect pin and must be set lo by the SPI master in order

to start communication. Pins MISO/SDA and MOSI/A0

are the data communication lines and pin SCLK/SCL

is the clock line generated by the SPI master (e.g. mi-

crocontroller). The SPI protocol frames are shown in

figure 13.

A communication frame consists of one address byte

and at least one data byte. Bits 7:6 of the address byte

is the opcode used for selecting a read operation (set

to "10") or a write (set to "01") operation. The remaining

6 bits are used for register addressing.

It is possible to transmit several bytes consecutively,

if the NCS signal is not reset and SCLK/SCL keeps

clocking, as it is shown in figure 13. The address is in-

ternally incremented after each transmitted byte. Once

the address reaches the last register (0x3F), it is reset

back to 0x00.

MOSI

SPI READ COMMAND FRAME. OPCODE = 10, POLARITY = 0, PHASE = 0

SPI WRITE COMMAND FRAME. OPCODE = 01, POLARITY = 0, PHASE = 0

NCS

Don't care

Data n

HIZ

MISO

HIZ (Pull-Up) Don't care

Data 1 MSB first

Data 2

Init Addr.(5:0) MSB first

SCLK

MOSI

SCLK

Data 1 MSB first

Data 2

Data n

Don't care

MISO

HIZ (Pull-Up) Don't care

NCS

Init Addr.(5:0) MSB first

Figure 13: SPI read and write commands

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 14.

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 specification

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 0b10000. Pins MOSI/A0 and

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

(see table 55 and 56).

Action

b7 b6 b5 b4 b3 b2 b1 b0

Write to slave

A1 A0

Read from slave

A1 A0

Table 55: I2C write/read byte

Action

A1 A0 Slave ID Address byte

Write to slave 0

0x40

0x80

Read from slave 0

0x40

0x81

Write to slave 1

0x41

0x82

Read from slave 1

0x41

0x83

Write to slave 2

0x42

0x84

Read from slave 2

0x42

0x85

Write to slave 3

0x43

0x86

Read from slave 3

0x43

0x87

Table 56: I2C write/read address

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