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BQ2000TS Datasheet(PDF) 9 Page - Texas Instruments

Part # BQ2000TS
Description  Programmable Multi-Chemistry Fast-Charge Management IC
PDF  18 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

BQ2000TS Datasheet(HTML) 9 Page - Texas Instruments

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SNS voltage is less than VSNSLO or greater than VSNSHI,
the bq2000 switches the MOD output low to shut off
charging current to the battery. Figure 8 shows a typical
multi-chemistry charge circuit.
Temperature Monitoring
The bq2000 measures the temperature by the voltage at
the TS pin. This voltage is typically generated by a neg-
ative-temperature-coefficient thermistor. The bq2000
compares this voltage against its internal threshold
voltages to determine if charging is safe. These
thresholds are the following:
n High-temperature cutoff voltage: VTCO = 0.225
∗ VCC
This
voltage
corresponds
to
the
maximum
temperature (TCO) at which fast charging is allowed.
The bq2000 terminates fast charge if the voltage on
pin TS falls below VTCO.
9
bq2000
Parameter
Value*
Maximum cell voltage (VMCV)2V
Minimum pre-charge qualification voltage (VLBAT)
950mV
High-temperature cutoff voltage (VTCO)
0.225
∗ VCC
High-temperature fault voltage (VHTF)
0.25
∗ VCC
Low-temperature fault voltage (VLTF)
0.5
∗ VCC
bq2000 fast-charge maximum time out (MTO)
RMTO
∗ CMTO ∗ 35,988
Fast-charge charging current (IMAX)
0.05/RSNS
Hold-off period
MTO/32
Top-off charging current (optional)
IMAX/16
Top-off period (optional)
MTO
Trickle-charge frequency
1Hz
Trickle-charge pulse-width
See Figure 7
*Please refer to DC Thresholds Specification for details.
Table 2. Summary of NiCd or NiMH Charging Characteristics
Parameter
Value*
Maximum cell voltage (VMCV)2V
Minimum pre-charge qualification voltage (VLBAT)
950mV
High-temperature cutoff voltage (VTCO)
0.225
∗ VCC
High-temperature fault voltage (VHTF)
0.25
∗ VCC
Low-temperature fault voltage (VLTF)
0.5
∗ VCC
bq2000 fast-charge maximum time-out (MTO)
2
∗ RMTO ∗ CMTO ∗ 35,988
Fast-charge charging current (IMAX)
0.05/RSNS
Hold-off period
MTO/32
Minimum current (for fast-charge termination)
IMAX/7
Trickle-charge frequency (before fast charge only)
1Hz
Trickle-charge pulse-width (before fast charge only)
See Figure 7
*Please refer to DC Thresholds Specification for details.
Table 3. Summary of Li-Ion Charging Characteristics



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