BQ76PL455APFCT datasheet(59/125 Pages) TI1

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bq76PL455A

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SLUSCL0A – SEPTEMBER 2016 – REVISED OCTOBER 2016

Product Folder Links: bq76PL455A

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For details on how to interpret the response, refer to Register Details. A simplified overview of the meaning of the

data bytes in this example is in the following table.

BYTE (HEX)

BYTE (BINARY)

DESCRIPTION

1 010 0 001

Command frame, Group Write with Response = REQ_TYPE, 8-bit Register Addressing, 2

data bytes = DATA_SIZE

00000001

Target is Group ID = 01

00000011

Target Register = 03 (Command Channel Select Register)

00000010

Address of highest device in target group

00000011

Number of Data Bytes – 1 expected in response (4 bytes in this example)

01001001

CRC

01000100

CRC

The command frame in this example will generate a response frame from each of the two devices targeted by

the command frame. Each response frame will contain data stored in the Command Channel Select register of

the responding bq76PL455A. The response frame from the bq76PL455A at the highest address in the addressed

group will arrive first. If the stored data were FFFF8000 (hex) for the device at Device Address 02 in Group 01

and the data were FFFF0100 (hex) for the device at Device Address 01 in Group ID 01, then the response

frames would be as in the following table.

Response Frame Init

0000011 (binary)

Data

CRC (MSB)

CRC (LSB)

Response Frame Init

0000011 (binary)

Data

CRC (MSB)

CRC (LSB)

The second of the two response frames will arrive immediately after the first response frame, so the response

will typically appear to be one continuous response. Therefore, it is important to remember that each responding

device will respond with a complete response frame with its own Frame Initialization byte, data bytes, and CRC

bytes.

7.5.3.3.4

Configuration 4: Group Write with Response to Non-Command Register

NOTE

This configuration uses one byte for addressing and response size.

As in the example for Configuration 3, the sample command frame in this example will read the value currently

stored in the Command Channel Select (address 3–6) register, but the message to do so is one byte shorter.

The expected response frames would be the same as in the example for Configuration 3.

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