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MCP2221 数据表(PDF) 24 Page - Microchip Technology

部件名 MCP2221
功能描述  USB 2.0 to I2C??UART Protocol Converter with GPIO
PDF  80 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP2221 数据表(HTML) 24 Page - Microchip Technology

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MCP2221
DS20005292B-page 24
 2015 Microchip Technology Inc.
3.1.1.1
Responses
TABLE 3-2:
RESPONSE 1 STRUCTURE
Byte
Index
Function Description
Value
Effect
0
0x10
Status/Set Parameters – command code echo
1
0x00
Command completed successfully
2
Cancel transfer
0x00
No special operation (i.e., Cancel current I2C/SMBus
transfer)
0x10
The current I2C/SMBus transfer was marked for
cancellation. The actual I2C/SMBus transfer cancellation
and bus release will need some time (a few hundreds of
microseconds, depending on the communication speed
initially chosen for the canceled transfer)
0x11
The I2C engine (inside MCP2221) was already in Idle
mode. The cancellation command had no effect.
30x00
No Set I2C/SMBus communication speed was issued.
0x20
The new I2C/SMBus communication speed is now
considered.
0x21
The I2C/SMBus communication speed was not set
(e.g., I2C transfer in progress).
4
The divider
value given
at the same
index in the
command
field
Only in the case when the code for establishing a new
communication speed is given at Byte Index 3.
0x00
When the communication speed is not being set.
5-7
Don’t care
Any value
8
Internal I2C state machine state
value
9
Lower byte (16-bit value) of the
requested I2C transfer length
10
Higher byte (16-bit value) of the
requested I2C transfer length
11
Lower byte (16-bit value) of the
already transferred (through I2C)
number of bytes
12
Higher byte (16-bit value) of the
already transferred (through I2C)
number of bytes
13
Internal I2C data buffer counter
14
Current I2C communication
speed divider value
15
Current I2C timeout value
16
Lower byte (16-bit value) of the
I2C address being used
17
Higher byte (16-bit value) of the
I2C address being used
18-21 Don’t care
Any value
22
SCL line value –
as read from the pin



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