BQ27210 Datasheet, PDF (15/30 Pages) Texas Instruments – Li-Ion AND Li-Pol BATTERY GAS GAUGE IC FOR PORTABLE APPLICATIONS (bqJUNIOR)

bq27010, bq27210
www.ti.com
SLUS707B – APRIL 2006 – REVISED JANUARY 2007
Reported Battery Voltage Registers (VOLTL/VOLTH) — Address 0x08/0x09
The VOLTH and the VOLTL low-byte registers contain the reported battery voltage measured on the BAT pin.
Voltage is expressed in mV with an LSB resolution of 1 mV. Reported voltage cannot exceed 5000 mV. The
host system has read-only access to this register pair. Voltage is updated every 2.56 seconds.
Status Flag Register (FLAGS) — Address 0x0A
NAME
POR STATUS
BIT 7
CHGS
0
BIT 6
NOACT
0
BIT 5
IMIN
0
BIT 4
CI
1
BIT 3
CALIP
0
BIT 2
VDQ
0
BIT 1
EDV1
0
BIT 0
EDVF
0
CHGS
Charge State flag. A 1 in the CHGS indicates a charge current (V_SRP > V_SRN). A 0 indicates a lack
of charge activity. This bit should be read when the host system reads the Average Current
register pair to determine the sign of the average current magnitude. This bit is cleared to 0 on all
resets.
NOACT
No Activity flag. A 1 indicates that the voltage across R_S is less than the digital magnitude filter.
See the Digital Magnitude Filter section for more information. This bit is cleared to 0 on all resets.
IMIN
Li-ion taper current detection flag. A 1 indicates that the charge current has tapered to less than
the value set in EEPROM and that the battery voltage is greater than or equal to the value
selected by the QV0 and QV1 bits in the PKCFG register (see EEPROM Data Register description
for more details). Taper current detection is disqualified if AI < 8 (28.6 µV across sense resistor).
The taper detection conditions must be maintained for 4 successive average current
measurements (20-25 s) to qualify as a valid taper current detection. This bit is cleared to 0 on all
resets.
CI
Capacity Inaccurate flag. A 1 indicates that the firmware has not been through a valid learning
cycle and is basing all calculations on initial design values programmed into EEPROM or that there
have been at least 32 cycle-count increments since the last learning cycle. This bit is cleared only
on a LMD update following a learning cycle. This bit is set to 1 on a full reset. The previous value
is retained if no RAM corruption is detected after a reset.
CALIP
Calibration-In-Progress flag. This flag is set whenever an automatic or commanded offset
calibration measurement is being made. This bit is set to 0 on all resets.
VDQ
Valid Discharge flag. A 1 indicates that the bqJUNIOR has met all necessary requirements for the
firmware to learn the battery capacity. This bit clears to 0 on a LMD update or condition that
disqualifies a learning cycle. This bit is cleared to 0 on all resets.
EDV1
First End-of-Discharge-Voltage flag. A 1 indicates that the voltage on the BAT pin is less than or
equal to the EDV1 threshold voltage. LMD updates immediately if the VDQ bit is set when this bit
transitions from 0 to 1. This bit is cleared when charging and on all resets.
EDVF
Final End-of-Discharge-Voltage flag. A 1 indicates that the voltage on the BAT pin is less than or
equal to the EDVF threshold voltage. This bit is cleared when charging and on all resets.
The host system has read-only access to this register.
Relative State-of-Charge (RSOC) — Address 0x0B
RSOC reports the nominal available capacity as a percentage of the last measured discharge value (LMD). The
equation is:
RSOC (%) = 100 * NAC/LMD
The host system has read-only access to this register.
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