BQ2019PW Datasheet, PDF (14/27 Pages) Texas Instruments – ADVANCED BATTERY MONITORIC

bq2019
ADVANCED BATTERY MONITOR IC
SLUS465E – DECEMBER 1999 – REVISED FEBRUARY 2003
APPLICATION INFORMATION
communicating with the bq2019 (continued)
command byte
The command byte of the bq2019 consists of eight contiguous valid command bits. The command byte contains
two fields: W/R command and address. The W/R bit of the command register determines whether the command
is a read or a write command, and the address field containing bit AD6-AD0 indicates the address to be read
or written. The command byte values are shown in the following table:
COMMAND BYTE
7
6
5
4
3
2
1
0
W/R AD6 AD5 AD4 AD3 AD2 AD1 AD0
W/R
Indicates whether the command byte is a read or write command. A 1 indicates a write
command and that the following eight bits should be written to the register specified by the
address field of the command byte, while a 0 indicates that the command is a read. On a
read command, the bq2019 outputs the requested register contents specified by the
address field portion of the command byte.
AD6–AD0
The seven bits labeled AD6–AD0 containing the address portion of the register to be
accessed.
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