BQ2084-V140_14 Datasheet, PDF (22/64 Pages) Texas Instruments – SBS v1.1-COMPLIANT GAS GAUGE FOR USE WITH THE bq29312

bq2084-V140
SLUS664B – JULY 2005 – REVISED AUGUST 2006
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The bq2084-V140 can also activate the SAFE output and set the PF Flag based on the PFIN input. If this pin is
low for PFIN Time seconds ±1 s, then the PFIN bit in PF Status is set.
The SAFE output can be driven low in any of the following conditions, and the bq2084-V140 sets the PF Flag
register (DF 0x11e) to 0x66 (011001100). The activation of the SAFE output and the setting of the PF Flag can
be enabled or disabled for different safety option per the PF Config (DF 0x11f) register settings.
The SAFE output and PF Flag register can only be cleared using a series of ManufacturerAccess() commands.
Table 12. SAFE Activation Conditions⁽¹⁾
CONDITION
Voltage() > Safety Over Voltage (DF 0x6b and 0x6c),
Temperature() > Safety Over Temperature in Charge (DF 0x75 and 0x76)
Temperature() > Safety Over Temperature in Discharge (DF 0x77 and 0x78)
When Miscellaneous Configuration (0x2a) bit 13 AC is set, and the number of AFE failures has reached the AFE Fail
Limit (DF 0xe4)
When VCELL_(MAX) - VCELL_(MIN) > Cell Imbalance Threshold (DF 0xee, 0xef) during charging
If charge FET is off, and charge current greater than FET Fail charge current stored in DF 0x125-0x126 for the time
determined by FET Fail time in DF 0x129, or if discharge FET is off and discharge current greater than FET Fail
discharge current stored in DF 0x127-0x128 for the time determined by FET Fail time in DF 0x129.
The PFIN input has detected a low state for PFIN Time in consecutive seconds, as determined by DF 0x120
(1) SAFE output activated and PF Flag set only if enabled by PF Config (DF 0x0x11f)
ACTIONS
SOV and PF set
SOTC and PF set
SOTD and PF set
AFE and PF set
CIM and PF set
FETF and PF set
PFIN, PF set
Permanent Failure Status (PF Status)
PF Status DF 0x11d contains the flags for the cause of the permanent failure mode.
b7
b6
b5
b4
PFF
PFIN
FETF
CIM
b3
b2
b1
b0
AFE
SOTD
SOTC
SOV
SOV
The SOV bit indicates a safety overvoltage occurred which if enabled by PF Config would cause the SAFE
output to activate.
0 SOV fault not detected (default)
1 SOV fault detected
SOTC
The SOTC bit indicates a safety overtemperature in charge occurred which if enabled by PF Config would
cause the SAFE output to activate.
0 SOTC fault not detected (default)
1 SOTC fault detected
SOTD
The SOTD bit indicates a safety overtemperature in discharge occurred which if enabled by PF Config would
cause the SAFE output to activate.
0 SOTD fault not detected (default)
1 SOTD fault detected
AFE
The AFE bit indicates an AFE integrity fault state occurred which if enabled by PF Config would cause the
SAFE output to activate.
0 AFE is operating correctly (default)
1 AFE Integrity check fail limit reached
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