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MCP39F521 датащи(PDF) 15 Page - Microchip Technology

номер детали MCP39F521
подробное описание детали  I2C Power Monitor with Calculation and Energy Accumulation
PDF  52 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP39F521 датащи(HTML) 15 Page - Microchip Technology

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 2015 Microchip Technology Inc.
DS20005442A-page 15
MCP39F521
4.0
COMMUNICATION PROTOCOL
The I2C communication protocol is a frame-based
protocol, with a complete communication frame
occurring between the I2C start and stop bits.
A command frame is a write transmission from the I2C
master to the MCP39F521 device.
A read response frame is read transmission from the
I2C master to the MCP39F521.
Each command frame consists of a header byte, the
number of bytes in the frame, command packet (or
command packets) and a checksum.
Each response frame consists of either a ACK, NAK,
CSFAIL, or ACK+Data with checksum.
4.1
COMMUNICATION FRAMES
The following two figures represent the command frames and read request frames.
FIGURE 4-1:
MCP39F521 Command Write Frame.
FIGURE 4-2:
MCP39F521 Read Response Frame (ACK with Data).
The following two figures represent I2C command frame writes and read frame responses.
FIGURE 4-3:
I2C Command Write Frame.
FIGURE 4-4:
I2C Read Response Frame.
Note:
If a custom communication protocol is
desired, please contact a Microchip sales
office.
Header Byte (0xA5) Number of Bytes
Command Packet1 Command Packet2
...Command Packet n
Checksum
Command
BYTE0
BYTE1 BYTE2 BYTE N
BYTE N
Command Frame
Frame Byte 1
Frame Byte 2
Frame Byte 3
Frame Byte N
...
ACK (0x06)
Number of Bytes
Data Byte 1
Data Byte 2
...Data Byte N
Checksum
Read Response Frame
Frame Byte 1
Frame Byte 2
Frame Byte 3
Frame Byte N
...
Frame Byte 4
Frame Byte N-1
Bus Activity
Master
SDA Line
Bus Activity
S 1
1 0 1
1
A
1
A
0 0
S
T
A
R
T
A
C
K
0
Control Byte
Frame Byte 1
A
C
K
0
Frame Byte 2
A
C
K
0
Frame Byte N
A
C
K
0
Frame Byte 3
P
S
T
A
R
T
S
T
O
P
A
C
K
0
Command
Command
Command
Command
Bus Activity
Master
SDA Line
Bus Activity
S 1
1 0 1
1
A
1
A
0 1
S
T
A
R
T
A
C
K
0
Control Byte
Frame Byte 1
A
C
K
0
Frame Byte 2
A
C
K
0
Frame Byte N
A
C
K
0
Frame Byte 3
P
S
T
A
R
T
S
T
O
P
A
C
K
1
Response
Response
N
O



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