L9963E datasheet(30/184 Pages) STMICROELECTRONICS

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Dev ID

1 1

Frame Num

(00011)

DATA READ

CRC

Dev ID

1 1

Frame Num

….

DATA READ

CRC

Dev ID

1 1

Frame Num

….

DATA READ

CRC

Dev ID

1 1

Frame Num

(10011)

DATA READ

CRC

Frame fields related to the burst access are described in the table below:

Table 22. Burst access special frame fields

Field

Length

Value

Description

P.A.

1 bit

Answer sent by any Slave unit (MISO)

Command sent by Master unit (MOSI)

R/W

1 bit

Read

Write

Dev ID

5 bit

From 0x1 to 0x1F

Identifies the x-th L9963E unit in a daisy chain

Command

7 bit

From 0x78 to 0x7D

Identifies a set of registers to be read out of the device

Command

feedback

GSW

2 bit

From 0x0 to 0x3

Refer to Section 4.2.4.5 Global Status Word (GSW)

CRC

6 bit

From 0x00 to 0x3F

CRC calculated on the [39-7] field of the frame. Refer to

Section 4.2.4.6 CRC calculation

Burst

1 bit

Identifies the frame being part of a burst

DATA READ

18 bit

Depends on the

Answer containing the data read from the y-th register of the y-th

device

Frame Num

5 bit

From 0x02 to 0x14

Identifies the n-th frame of a burst answer. In the first frame it is

replaced by the Command feedback.

Several burst commands are available:

Table 23. Available burst commands

Command

code

Description

Reference

0x78

All cells voltage, Sum of cells, Stack Voltage divider, Instantaneous Current, Balancing status.

This command clears the measurement data_ready bit (refer to Section 4.4 Cell voltage

measurement)

Table 24

L9963E

Serial communication interface

DS13636 - Rev 12

page 30/184

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