BQ2063_15 Datasheet, PDF (13/60 Pages) Texas Instruments – SBS v1.1-COMPLIANT Li-ION GAS-GAUGE IC

Not Recommended For New Designs
bq2063
SBS v1.1ĆCOMPLIANT LiĆION GASĆGAUGE IC
WITH PROTECTOR INTERFACE
SLUS468E− MAY 2001 − REVISED APRIL 2002
midrange capacity corrections
The bq2063 applies midrange capacity corrections when the VCOR bit is set in Pack Configuration. The bq2063
adjusts RM to the associated percentage at three different voltage levels: VOC25, VOC50, and VOC75. The
VOC values represent the open circuit battery voltage at which RM corresponds to the associated for each
threshold.
For the midrange corrections to occur, the temperature must be in the range of 19°C to 31°C inclusive and the
Current( ) and AverageCurrent( ) must both be between −64 mA and 0. The bq2063 makes midrange
corrections as shown in Table 4. For a correction to occur, the bq2063 must detect the need for correction twice
during subsequent 20-s intervals. With the VCOR bit set, the bq2063 makes mid-range corrections whenever
conditions permit. If the OTVC bit in Pack Configuration is set and VCOR = 0, the bq2063 makes a single attempt
of mid-range correction immediately after device reset and does not require a second validation. The OTVC bit
read by command code 0x2f is cleared within 2 seconds after a device reset, when the midrange voltage
correction attempt is made.
Table 4. Midrange Corrections
Voltage( )
CONDITION
≥ VOC75 and RelativeStateOfCharge( ) ≤ 63%
< VOC75 and RelativeStateOfCharge( ) ≥ 87%
≥VOC50 and RelativeStateOfCharge( ) ≤ 38%
<VOC50 and RelativeStateOfCharge( ) ≥ 62%
≥ VOC25 and RelativeStateOfCharge( ) ≤ 13%
< VOC25 and RelativeStateOfCharge( ) ≥ 37%
RESULT
RelativeStateOfCharge( )→75%
RelativeStateOfCharge( )→75%
RelativeStateOfCharge( )→50%
RelativeStateOfCharge( )→50%
RelativeStateOfCharge( )→25%
RelativeStateOfCharge( )→25%
charge control
charging voltage and current broadcasts
The bq2063 supports SBS charge control by broadcasting the ChargingCurrent( ) and ChargingVoltage( ) to
the Smart Charger address. The bq2063 broadcasts the requests every 10 seconds. The bq2063 updates the
values used in the charging current and voltage broadcasts based on the battery’s state of charge, voltage, and
temperature. The charge voltage is programmed in Charging Voltage EE 0x0a-0x0b. The charge current may
take any of four different values and depends on charge state and operating conditions.
The bq2063 internal charge control is compatible with the constant current/constant voltage profile for Li-Ion.
The bq2063 detects primary charge termination on the basis of the tapering charge current during the
constant-voltage phase.
alarm broadcasts to smart charger and host
If any of the bits 8−15 in BatteryStatus( ) are set, the bq2063 broadcasts an AlarmWarning( ) message to the
Host address. If any of the bits 12−15 in BatteryStatus( ) are set, the bq2063 also sends an AlarmWarning( )
message to the Smart Charger address. The bq2063 repeats the AlarmWarning( ) messages every 10 seconds
until the alarm bits are cleared.
precharge qualification
The bq2063 sets ChargingCurrent( ) to the precharge rate as programmed in Pre-charge Current EE 0x1e
under the following conditions:
D Voltage: The bq2063 requests the precharge charge rate when Voltage( ) or the lowest cell voltage drops
below the EDVF threshold or when the EDV0 threshold is detected. Once requested, a precharge rate
remains until Voltage( ) or the lowest cell voltage increases above the EDVF threshold. The EDVF threshold
is programmed in EDVF/ EDV0 EE 0x72-0x73.
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