BQ76PL455APFCT datasheet(56/125 Pages) TI1

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bq76PL455A

SLUSCL0A – SEPTEMBER 2016 – REVISED OCTOBER 2016

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Command Frame Init

000 (binary)

001 (binary)

Device Address

Data (Desired Number of Bytes - 1)

CRC (MSB)

CRC (LSB)

NOTE

The DATA_SIZE field in the Frame Initialization byte is 1, indicating that this command

frame contains a single data byte. This data byte indicates the number of desired bytes in

the response (minus one).

The response frame will contain eleven bytes: one Frame Initialization byte, eight data

bytes, and two CRC bytes.

7.5.3.2 Single Device Write without Response Command Frame

A Single Device Write without Response command is indicated when FRM_TYPE = 1 and REQ_TYPE = 1. 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.

The command in the example writes a single byte value to the Averaging Register (address 7).

For the purpose of this example, assume the following start conditions:

1. Content of Averaging Register before command: 00

Command Frame Init

001 (binary)

Device Address

Data (New Data for Target Register)

CRC (MSB)

CRC (LSB)

The content of the Averaging Register will change. Resulting Averaging Register content will be: 05.

To write more than one byte to the bq76PL455A, the DATA_SIZE field in the Frame Initialization byte should be

updated and additional data bytes added to the command frame. A single command frame of this type can write

up to eight, data bytes.

7.5.3.3 Group_Write_With_Response Command Frame

There are several different ways to format the Group Write with Response command frame, and the

interpretation of the data bytes will be different depending on the command frame configuration.

The Group Write with Response, which targets the Command register (address 2), has several different

configurations. These configurations also differ from the two configurations of the Group Write with Response

when it is targeted to a register other than the Command register. Primary examples of these different

configurations are in the following sections.

It is important to note that devices in defined Groups must consist of devices with consecutive addresses. The

device with the lowest address should be located closest to the host (that is, higher addresses should be located

higher in the stack). Devices will respond to Group Write with Response command frames in order of decreasing

address. If an address does not exist, the device will stop the responses. The recommendation is to have a

group in which devices only have contiguous addresses. To establish Group IDs, program the Group ID Register

(address 11) of all devices in a specific group to the same value.

BQ76PL455APFCT Datasheet(PDF) 56 Page - Texas Instruments

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