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USB-TO-GPIO 数据表(PDF) 17 Page - Texas Instruments

部件名 USB-TO-GPIO
功能描述  USB Interface Adapter Evaluation Module
PDF  50 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

USB-TO-GPIO 数据表(HTML) 17 Page - Texas Instruments

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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
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
17
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