Datasheet

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bq2084-V143

SLUS732 – SEPTEMBER 2006

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 bq29312 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-V143 is not sealed as indicated by bit 5 of PackStatus.

Table 11. Overcurrent Protection

FAILURE FET STATUS CLEAR CONDITIONS

NR=1

AFE OLV CHG on, ZVCHG off, DSG off Same AFE SCD

Average Current ()< Clear Fail Current (DF 0x61/2) for

AFE SCC CHG off, ZVCHG off, DSG on Fault Reset Time (DF 0x130), or discharge current >

discharge detection current (DF 0x115/6)

Average Current () ≤ -Clear Fail Current (DF 0x61/2) for

AFE SCD CHG on, ZVCHG off, DSG off Fault Reset Time (DF 0x130), or charge current > charge

detection current (DF 0x113/4)

GG Charge OC (set by DF 0x12a to 0x12c) CHG off, ZVCHG off, DSG on Same AFE SCC

GG Discharge OC (set by DF 0x12d to 0x12f) CHG on, ZVCHG off, DSG off Same AFE SCD

NR=0

FAILURE FET STATUS EXIT CONDITIONS

AFE OLV All FETs off RRES=high

AFE SCC All FETs off PRES=high

AFE SCD All FETs off PRES=high

GG Charge OC (set by DF 0x12a to 0x12c) All FETs off PRES=high

GG Discharge OC (set by DF 0x12d to 0x12f) All FETs off PRES=high

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