USB-TO-GPIO datasheet(17/50 Pages) TI1

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3.9

Set I2C-PMBUS-SMBUS Speed Command and Response

3.10 Generic I2C Write Command and Response

Set I2C-PMBUS-SMBUS Speed Command and Response

USB PACKET

COMMAND

BYTE 0

USB PACKET USB PACKET

USB PACKET USB PACKET USB PACKET

USB PACKET

COMMENTS

DESCRIPTION

COMMAND

BYTE 1

BYTE 2

BYTE 3

BYTE 4

BYTE 5

BYTES 6–63

CODE

A (0 for

Set

100 kHz,

0x1B

I2C-PMBUS-

otherwise

SMBUS Speed

400 kHz)

USB PACKET

COMMAND

BYTE 0

USB PACKET USB PACKET

USB PACKET USB PACKET USB PACKET

USB PACKET

COMMENTS

DESCRIPTION

COMMAND

BYTE 1

BYTE 2

BYTE 3

BYTE 4

BYTE 5

BYTES 6–63

CODE

Response from

Done with

Set

0x9B

speed

I2C-PMBUS-

selection

SMBUS Speed

For I2C, PMBUS, or SMBUS communications, the clock speed can be set to either 100 kHz or 400 kHz.

As an I2C, PMBUS, or SMBUS master, the USB interface adapter supports clock stretching (up to 25 ms

per transaction). The firmware sets the default clock speed to 100 kHz.

USB PACKET

COMMAND

BYTE 0

USB PACKET USB PACKET

USB PACKET USB PACKET USB PACKET

USB PACKET

COMMENTS

DESCRIPTION

COMMAND

BYTE 1

BYTE 2

BYTE 3

BYTE 4

BYTE 5

BYTES 6–63

CODE

The first byte

of data to

write is usually

Generic I2C

0x1C

A number of bytes (from 2 up to 62) to write

(device

Write

address < 1 +

write bit of 0).

USB PACKET

COMMAND

BYTE 0

USB PACKET USB PACKET

USB PACKET USB PACKET USB PACKET

USB PACKET

COMMENTS

DESCRIPTION

COMMAND

BYTE 1

BYTE 2

BYTE 3

BYTE 4

BYTE 5

BYTES 6–63

CODE

Response from

Success: 0

0x9C

Generic I2C

Fail: 1

Write

This is a generic I2C Write transaction command that can be applied to majority of I2C applications. The

detailed bit-banking is as follows: I2C start

→ repeat (write 1 data byte, slave ACK) for A number of

times

→ I2C stop.

Basically, all the transaction bytes are placed one after another, such as address byte (7-bit slave address

shifted left by 1 bit + write bit of 0), one or multiple command bytes, one or multiple data bytes into the A

number of bytes buffer space, then the USB interface adapter carries out the bit banking. For maximum

flexibility, this generic command for any I2C write transaction is recommended.

SLLU093 – August 2006

Firmware Programming and Communications Protocol

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