BQ76PL455APFCT datasheet(48/125 Pages) TI1

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bq76PL455A

SLUSCL0A – SEPTEMBER 2016 – REVISED OCTOBER 2016

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Command and Response Protocol (continued)

7.5.1.1 Frame Initialization Byte

The Frame Initialization Byte is always the first byte of the frame. In all cases, the length of the frame can be

determined from this initial byte. Note that bit 7 identifies each frame as either a command frame or a response

frame. The initialization byte is defined as follows for each of the two Frame Init types:

Command Frame Init

FRM_TYPE = 1

REQ_TYPE

ADDR_SIZE

DATA_SIZE

Response Frame Init

FRM_TYPE = 0

RESP_BYTES-1

The descriptions for the fields shown in the frame initialization bytes are in Table 4.

Table 4. Frame Initialization Byte Fields

VALUE (BINARY)

DESCRIPTION

FRM_TYPE

Response Frame

Command Frame

REQ_TYPE

000

Single Device Write with Response

001

Single Device Write without Response

010

Group Write with Response

011

Group Write without Response

100

Reserved

101

Reserved

110

Broadcast Write with Response

111

Broadcast Write without Response

ADDR_SIZE(1)

8-bit Register Address

16-bit Register Address

DATA_SIZE(2)

000

0 bytes

001

1 byte

010

2 bytes

011

3 bytes

100

4 bytes

101

5 bytes

110

6 bytes

111

8 bytes

RESP_BYTES-1

Number of data bytes contained in response frame minus 1

(1) ADDR_SIZE = 0 is recommended. All USER registers are addressable using an 8-bit register address.

(2) Data size of 7 bytes is not supported.

BQ76PL455APFCT Datasheet(PDF) 48 Page - Texas Instruments

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