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BQ78412 Fiches technique(PDF) 16 Page - Texas Instruments

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No de pièce BQ78412
Description  Pb-Acid Battery State-of-Charge Indicator With Run-Time Display
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

BQ78412 Fiches technique(HTML) 16 Page - Texas Instruments

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bq78412
SLUSAA0 – OCTOBER 2010
www.ti.com
Command Set and Status Reporting
This section describes the bq78412 communications, command set, and status reporting.
Command Syntax
Communications between the bq78412 and external host device consists of message commands.
The host to bq78412 commands are always seven (7) bytes long with the general format shown below.
General Command Format Host to bq78412
Address
ID
Param0
Param1
Param2
Param3
Checksum
The address is a hexadecimal number that distinguishes between target bq78412 devices. The default
address is 0xFF.
The header ID is a hexadecimal number that distinguishes between individual commands.
Checksum is XOR of all bytes (excluding checksum) including header ID = 0xFF XOR Address XOR ID XOR
Param0 …..XOR Param3
The bq78412 sends a response with its address, ACK requested data if any, and checksum upon successful
reception of a command that is addressed to it.
The bq78412 sends a response with its address, NACK, and checksum if a command packet addressed to it
has been correctly received but the command is not implemented or not allowed to be used due to the
security level.
The bq78412 does not respond to packets that have a different address or when the checksum is invalid.
The transmission of any requested data follows the transmitted ACK character.
Addresses are in Little Endian format (least significant bit first).
Read or write data are in Little Endian format.
General Response Code from bq78412 to host
Address
Response Code
Byte0
Byte1
...
Byte n-2
Byte n-1
Checksum
ACK Response from bq78412 to host, no response data
Address
ACK = "!"
Checksum
ACK Response Code from bq78412 to host with data.
Address
ACK = "!"
Byte0
Byte1
...
Byte n-2
Byte n-1
Checksum
NACK Response from bq78412 to host
Address
NACK = 0x15
Checksum
Broadcast Message from bq78412
Address
ACK = "!"
Byte0
Byte1
...
Byte24
Byte25
Checksum
Checksum
is
XOR
of
all
bytes
(excluding
checksum)
including
address
byte
and
ACK
byte.
= = 0xFF XOR Address XOR ACK/NACK XOR byte0 XOR byte1 …..XOR byte n-2 XOR byte n-1
When data are not requested only the Address, ACK, and checksum are transmitted.
The bq78412 uses the "!" character as the ACK response code. Its value is 0x21.
The bq78412 uses 0x15 as NACK response code.
Single Word Write
Host request to bq78412
Address
0x17
Address LSB
Address MSB
Data LSB
Data MSB
Checksum
Note: The memory address is a byte address and must be an even number.
16
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Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): bq78412


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