BQ76PL455APFCT datasheet(52/125 Pages) TI1

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bq76PL455A

SLUSCL0A – SEPTEMBER 2016 – REVISED OCTOBER 2016

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DINn

CRC15:0

DINn

CRC15:0

DINn

CRC15:0

1000_0000_0000_0000

0010_0001_1100_1001

0100_1010_0001_0101

0100_0000_0000_0000

0011_0000_1110_0101

0000_0101_0000_1011

0010_0000_0000_0000

0011_1000_0111_0011

0010_0010_1000_0100

0001_0000_0000_0000

1011_1100_0011_1000

1001_0001_0100_0010

1000_1000_0000_0000

0101_1110_0001_1100

1100_1000_1010_0001

0100_0100_0000_0000

0010_1111_0000_1110

1100_0100_0101_0001

0010_0010_0000_0000

0001_0111_1000_0111

1100_0010_0010_1001

1001_0001_0000_0000

1010_1011_1100_0010

1100_0001_0001_0101

1100_1000_1000_0000

1101_0101_1110_0001

0100_0000_1000_1011

1110_0100_0100_0000

1100_1010_1111_0001

0000_0000_0100_0100

0111_0010_0010_0000

0100_0101_0111_1001

1000_0000_0010_0010

0011_1001_0001_0000

1000_0010_1011_1101

1100_0000_0001_0001

0001_1100_1000_1000

1110_0001_0101_1111

1100_0000_0000_1001

0000_1110_0100_0100

1101_0000_1010_1110

1100_0000_0000_0101

0000_0111_0010_0010

0110_1000_0101_0111

0100_0000_0000_0011

0000_0011_1001_0001

1001_0100_0010_1010

0000_0000_0000_0000

There are many good sources for algorithms and efficient techniques for generating and checking CRCs

available on the Internet. The following byte-oriented C language routine has been developed and verified as a

reference. The only complication needed to take into account using this function is that the low byte of the CRC

value returned is the CRC (MSB) and the high byte is the CRC (LSB).

Uint16 crc_16_ibm(uint8 *buf, uint16 len) {

uint16 crc = 0;

uint16 j;

while (len--) {

crc ^= *buf++;

for (j = 0; j < 8 8; j++)

crc = (crc >> 1) ^ ((crc & 1) ? 0xa001 : 0);

}

return crc;

}

7.5.3 Transaction Frame Examples

To illustrate the various Command and Response formats, examples of representative transaction-frame types

are presented in the following paragraphs. All numeric values are in hexadecimal unless otherwise noted. The

CRC values in the examples are correct and the implementer can use them to verify the CRC algorithm. Unless

specifically noted otherwise, all examples use 8-bit register addressing.

Additional communication examples with matched command and response frames are in the bq76PL455A-Q1

Software Design Reference (SLVA617).

Command Frames fall into two general categories:

1. Command frames that generate one or more response frames

2. Command frames that do not generate response frames

The REQ_TYPE field in the Frame Initialization byte determines the category to which a command frame

belongs. Category 1 contains the Single Device Write with Response, Group Write with Response, and

Broadcast Write with Response request types. Category 2 contains the Single Device Write without Response,

Group Write without Response, and Broadcast Write without Response request types.

Command frames that generate response frames, may generate more than one response frame. This depends

on the specific command frame and the number of devices addressed by the command frame. In the case where

more than one response frame is received in response to a single command frame, each response frame will be

a complete frame containing the Frame Initialization, Data, and CRC bytes. A single device will not respond with

more than a single-response frame in response to any single-command frame.

BQ76PL455APFCT Datasheet(PDF) 52 Page - Texas Instruments

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