Datasheet
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FUNCTIONAL BLOCK DIAGRAMS
Bandgap,
Reference
and Bias
Temperature
Compensated
Precision Oscillator
Clock
Generator
EEPROM
RAM
SCPU
System I/O
and Control
Temperature
Sensor
ADC
2VCC
8SRP
7SRN
6BAT
5 HDQ
9 GPIO
1
RBI
3 VSS
bq27000
10 RGM
Autocalibration
and
Autocompensating
Coulomb Counter
UDG−03040
UDG−04123
Bandgap,
Reference
and Bias
Autocalibration and
Autocompensating
Coulomb Counter
Temperature
Compensated
Precision Oscillator
Clock
Generator
EEPROM
RAM
SCPU
System I/O
and Control
Temperature
Sensor
ADC
2VCC
8SRP
7SRN
6BAT
4 SCL
9 GPIO
1 RBI
3 VSS
bq27200
5 SDA
10 RGM
FUNCTIONAL DESCRIPTION
bq27000 , bq27200
SLUS556D – SEPTEMBER 2004 – REVISED MARCH 2006
The bqJUNIOR determines battery capacity by monitoring the amount of charge input to or removed from a
Li-Ion or Li-Pol battery. The bqJUNIOR measures discharge and charge currents, monitors the battery for low
voltage thresholds, and compensates for self-discharge, aging, temperature, and discharge rate. Current is
measured across a small value series resistor between the negative terminal of the battery and the pack ground
(see R
S
in Figure 3 ). Available capacity is reported with a resolution of 3.57 µVh. Time-To-Empty reporting in
minutes at standby, peak, actual, and at-rate currents allows the requirements for host-based calculations to be
greatly reduced or eliminated; reading a single register pair provides useful and meaningful information to the
end user of the application.
7
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