bq20z80-V101
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SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
UnSealKey( ) (0x60)
This read/write block (2-words) command allows the user to change the Unseal key for the Sealed-to-Unsealed
security-state transition. This function is only available when the bq20z80 is in the Full-Access mode
(SBS.OperationStatus( ), FAS is clear).
FullAccessKey( ) (0x61)
This read/write block (2-words) command allows the user to change the Full-Access security key for the
Unsealed-to-Full-Access security-state transition. This function is only available when the bq20z80 is in the
Full-Access mode (SBS.OperationStatus( ), FAS is clear).
PFKey( ) (0x62)
This read/write block (2-words) command allows the user to change the Permanent-Failure-Clear key. This
function is only available when the bq20z80 is in the Full Access mode (SBS.OpertionStatus( ), FA is set).
ManufacturerInfo( ) (0x70)
This read-block function returns the data stored in DF:Manufacturer Info 1...8 (MfgInfo), where byte 1 is the MSB
with a maximum length of 8 data + 1 length byte. When the bq20z80 is in Unsealed or Full Access mode, this
block is R/W.
SenseResistor( ) (0x71)
This write-word command allows the user to change the sense resistor value used, in units of µΩ with a range of
0 to 62535. The bq20z80 automatically updates the respective calibration data on receipt of a new sense resistor
value.
DataFlashClass( ) (0x77)
This write word command sets the bq20z80 data flash subclass that is to be accessed by the
SBS.DataFlashSubClass( ) commands that follow. These commands only allow access to the configuration data
flash locations within the respective labeled subclass. See the Data Flash Access section for further details.
A NACK is returned to the SBS.DataFlashClass( ) command if the value of the class is outside of the allowed
range. The subclasses are defined in the Data Flash section of this data sheet.
DataFlashSubClass( ) Commands
These commands are used to access the consecutive 32-byte pages of each subclass.
NOTE:
Any DF location deemed Reserved responds with a NACK unless the bq20z80 is in
the correct security state to allow access.
DataFlashClassSubClass1( ) (0x78)
DataFlashClassSubClass2( ) (0x79)
DataFlashClassSubClass3( ) (0x7a)
DataFlashClassSubClass4( ) (0x7b)
DataFlashClassSubClass5( ) (0x7c)
DataFlashClassSubClass6( ) (0x7d)
DataFlashClassSubClass7( ) (0x7e)
DataFlashClassSubClass8( ) (0x7f)
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