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BQ78412 Fiches technique(PDF) 25 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
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BQ78412 Fiches technique(HTML) 25 Page - Texas Instruments

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SLUSAA0 – OCTOBER 2010
Manufacturer Data
Manufacturer-specific data can be stored in the flash memory. The 14-byte space provided can be used as the
manufacturer wishes. For example:
InstallationDate parameter can store the installation date of the battery, packed in 2-bytes as:
(Year-2010) x 512 + Month x 32 + Day
ActivationDate parameter can store the activation date of the battery, packed in 2-bytes as:
(Year-2010) x 512 + Month x 32 + Day.
ActivationIndicator parameter can store activation details such as batch number, packed in 2-bytes.
MFGCodeSN parameter can store other details such as model number, serial number, etc, packed in 8-bytes.
Data Security
The bq78412 has three levels of data security: Levels 0, 1, and 2.
SealedLevel0 is the fully unsealed mode where parameters are accessible and programmable under user
control. Upon initial power up, the bq78412 defaults to Level 0, so that all parameters can be set and the
device can be calibrated.
SealedLevel1 is the partially sealed mode where the only parameters that can be modified are MultiDropAdr,
InstallDate, ActivationDate, ActivationIndicator and MFGCodeSN, Level1Password. Several parameters can
be read in this mode.
SealedLevel2 is fully sealed mode where none of the parameters can be modified.
Table 10 summarizes the sealed access levels.
Table 10. Sealed Access Levels
BatteryStatusWord
LEVEL
OPERATION
[15,14]
Device unsealed and full access to parameters, warranty data memory, and calibration data
SealedLevel0
[0,0]
are permitted.
SealedLevel1
[0,1]
Device partially sealed. Read access to many parameters.
SealedLevel2
[1,0]
Device fully sealed, Only read access to some parameters.
Configuring Security Levels
The seal level can be increased by sending any of the following commands to the bq78412 over the serial
interface.
"Set SealedLevel1 from SealedLevel0": Sets the bq78412 to SealedLevel1 from SealedLevel0.
"Set SealedLevel2": Sets the bq78412 to SealedLevel2 from SealedLevel0 or SealedLevel1.
Unsealing the bq78412
The seal level can be decreased by sending any of the following commands to the bq78412 via the serial
interface, along with the appropriate password:
"Set SealedLevel0": Sets the bq78412 to SealedLevel0 from SealedLevel1 or SealedLevel2 when the
received password matches the value in the parameter Level0Password.
"Set SealedLevel1 from SealedLevel2": Sets the bq78412 to SealedLevel1 from SealedLevel2 when the
received password matches the value in the parameter Level1Password.
After it is unsealed from SealedLevel1 or SealedLevel2, the bq78412 remains unsealed until no activity has been
detected on the UART for 60 seconds. After this interval, it reverts to the previous sealed state. Hence, the
bq78412 can be maintained in an unsealed state as long as valid commands are being sent to the device at
intervals of less than 60 seconds.
The bq78412 does not implement any special algorithm for evaluating the unseal password. It is highly
recommended that the password be set immediately prior to sealing the device. For highest security, a secret
algorithm should be used to generate the passwords based on a secret key and the battery serial number.
Copyright © 2010, Texas Instruments Incorporated
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