BQ2016 Datasheet, PDF (18/21 Pages) Texas Instruments – GAS GAUGE IC FOR HIGH DISCHARGE RATES

bq2016
GAS GAUGE IC FOR
HIGH DISCHARGE RATES
SLUS475A– JANUARY 2001 – REVISED NOVEMBER 2002
To calibrate the VFC, 0x68 must be written to this location. During VFC offset calibration, the bq2016 deselects
the SR1 and SR2 inputs and disables the LEDs. When the bq2016 successfully completes VFC calibration, it
sets the OCE bit in FLAGS1. The command 0x60 terminates a VFC calibration. The bq2016 automatically
performs VFC calibration after trickle detection and initial power-up, and when NAC = LMD.
PFC (0x0f) – Programmed Full Count
The PFC register stores the battery design capacity as defined by the VPFC input.
VSB (0x10 and 0x11) – Battery Voltage
VSBH (0x11) and VSBL (0x10) form the 16-bit register that contains the voltage present at the SB input pin in
mV.
VSR (0x12 and 0x13) – Current Scale
VSRH (0x13) and VSBL (0x12) form the 16-bit register that contains the voltage present across the SR inputs
pin in mV.
TEMPV (0x14 and 0x15) – Thermistor Voltage
TEMPVH (0x15) and TEMPVL (0x14) form the 16-bit register that contains the voltage present at the TS inputs
pin in mV.
DCR (0x18) – Discharge Count Register
DCR stores the cumulative discharge count from the time VDQ is set on a charge. The data is represented in
the same units as PFC. The number of counts equals DRC × 256.
FLAGS3 (0x4c) – Third Status Flags
The FLAGS3 register provides bq2016 status information. The 8-bit register includes the following status bits:
7
6
5
4
3
RSVD RSVD RSVD RSVD VQ
2
CR1
1
CR0
0
RSVD
CR1–CR0
The CR1–CR0 bits represent the present charge rate of the battery according to the following code:
CHARGE RATE INDICATION
CHARGE RATE (R)
CR1
R≤C/8
0
C/5≥R>C/8
0
R>C/5
1
CR0
0
1
1
VQ
The bq2016 sets the VQ bit when it detects a valid charge condition. A valid charge is two NAC increments.
Bit = Condition
0 = No valid charge condition
1 = Valid charge condition present
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