BQ76PL455APFCT datasheet(60/125 Pages) TI1

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bq76PL455A

SLUSCL0A – SEPTEMBER 2016 – REVISED OCTOBER 2016

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Command Frame Init

010 (binary)

001 (binary)

Group ID

Data (Address of Highest Device in Group to

Respond)

CRC (MSB)

CRC (LSB)

For details on how to interpret the data, 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, 1

data byte = DATA_SIZE

00000001

Target is Group ID = 01

00000011

Target Register = 03 (Command Channel Select Register)

011 00010

Upper three bits are Number of Data Bytes – 1 expected in response, lower 5 bits is

address of highest device in group to respond

11110011

CRC (MSB)

00100101

CRC (LSB)

NOTE

Although not recommended, each of the configurations can also use 16-bit register

addressing, which would add another byte for the MSB of the register address to the

command frame.

7.5.3.4 Group Write without Response Command Frame

A Group Write without Response command is indicated when FRM_TYPE = 1 and REQ_TYPE = 3 (011 binary).

In this example, the register address size is 8-bits (ADDR_SIZE = 0) and the data length written is 1 byte

(DATA_SIZE). No Response Frame is expected to be returned.

In response to this example command frame, each bq76PL455A in the target group will write the value in the

data byte to the target register (the Averaging Register in this example). For more information on the effect of this

example command frame, see Register Details.

Command Frame Init

011 (binary)

001 (binary)

Group ID

Data

CRC (MSB)

CRC (LSB)

7.5.3.5 Broadcast Write with Response Command Frame

As with the Single Write and Group Write with Response command frames, the interpretation of the Broadcast

Write with Response command frame bytes will be different when the target register is the Command Register

(address 2) compared to when the target is another register. Determination of response frame lengths when the

command frame targets the Command Register will be by the content of the Channel Select Register of each

targeted bq76PL455A device.

Broadcast Write command frames do not contain a Device Address/Group ID byte. This is the primary deviation

from the examples already provided in the Group Write with Response section.

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