BQ2084DBTR-V150 Datasheet, PDF (22/69 Pages) Texas Instruments – SBS v1.1-COMPLIANT GAS GAUGE WITH LED DELAY

bq2084-V150
SLUS758 – JUNE 2007
www.ti.com
SOTC is stored as Safety Over Temperature in Charge = SOTC/0.1 (°C) as an unsigned integer
SOTD is stored as Safety Over Temperature in Discharge = SOTD/0.1 (°C) as an unsigned integer. Exceeding
the Safety Temperatures for a period exceeding Over Temperature Time DF 0x162 causes permanent failure if
enabled by PFConfig.
There are also temperature thresholds to disable both charge and discharge FETs and to set the SBS Battery
Status Overtemperature bit. The thresholds are set according to whether discharge or charge is detected. The
Charge Suspend Temp High threshold is stored in DF 0x6d-0x6e with the reset threshold stored in DF
0x6f-0x70. Likewise, the Over Temperature Discharge threshold is stored in DF 0x71-0x72 with the reset
threshold stored in DF 0x73-0x74. If the OT bit in Misc Configuration is set then all temperature protection is
disabled except for Safety Over Temperature.
The Charge Suspend Temp Low threshold (CSTL) is stored in Charge Suspend Temp Low DF 0x79-0x7a and is
stored as Charge Suspend Temp Low = CSTL/0.1 (°C) as a signed integer. A Charge Suspend Temp Low turns
off the charge FET. The maximal value of Charge Suspend Temp Low setting is 12.7 °C.
AFE Configuration
The AFE protection limits are programmed as specified in the bq29312A data sheet.
AFE Over Load DF 0xc5 sets the AFE overload protection threshold.
AFE Over Load Delay DF 0xc6 sets the delay timing for overload protection.
AFE Short Circuit in Charge DF 0xc7 sets the AFE short circuit in charge protection threshold and delay
time.
AFE Short Circuit in Discharge DF 0xc8 sets the AFE short circuit in discharge protection threshold and
delay time.
SMBus command 0x46 can be used to string-read the AFE RAM with the AFE address 0x00 first, if the
bq2084-V150 is not sealed as indicated by bit 5 of PackStatus.
Table 11. Overcurrent Protection
NR=1
AFE OLV
AFE SCC
FAILURE
FET STATUS
CHG on, ZVCHG off, DSG off
CHG off, ZVCHG off, DSG on
AFE SCD
CHG on, ZVCHG off, DSG off
GG Charge OC (set by DF 0x12a to 0x12c) CHG off, ZVCHG off, DSG on
GG Discharge OC (set by DF 0x12d to 0x12f) CHG on, ZVCHG off, DSG off
NR=0
FAILURE
FET STATUS
AFE OLV
All FETs off
AFE SCC
All FETs off
AFE SCD
All FETs off
GG Charge OC (set by DF 0x12a to 0x12c) All FETs off
GG Discharge OC (set by DF 0x12d to 0x12f) All FETs off
CLEAR CONDITIONS
Same AFE SCD
Average Current ()< Clear Fail Current (DF 0x61/2) for
Fault Reset Time (DF 0x130), or discharge current >
discharge detection current (DF 0x115/6)
Average Current () ≤ -Clear Fail Current (DF 0x61/2) for
Fault Reset Time (DF 0x130), or charge current > charge
detection current (DF 0x113/4)
Same AFE SCC
Same AFE SCD
RRES=high
PRES=high
PRES=high
PRES=high
PRES=high
EXIT CONDITIONS
22
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