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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

2

VCC

8

SRP

7

SRN

6

BAT

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

2

VCC

8

SRP

7

SRN

6

BAT

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

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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