BQ2000PW datasheet(2/18 Pages) TI

2 / 18 page

Pin Descriptions

SNS

Current-sense input

Enables the bq2000 to sense the battery cur-

rent via the voltage developed on this pin by

an external sense-resistor connected in se-

ries with the battery pack

VSS

System Ground

LED

Charge-status output

Open-drain output that indicates the charg-

ing status by turning on, turning off, or

flashing an external LED

BAT

Battery-voltage input

Battery-voltage sense input. A simple resistive

divider, across the battery terminals, generates

this input.

Temperature-sense input

Input for an external battery-temperature

monitoring circuit. An external resistive di-

vider network with a negative tempera-

ture-coefficient thermistor sets the lower

and upper temperature thresholds.

Timer-program input

RC input used to program the maximum

charge-time, hold-off period, and trickle

rate during the charge cycle, and to disable

or enable top-off charge

VCC

Supply-voltage input

MOD

Modulation-control output

Push-pull output that controls the charging

current to the battery. MOD switches high

to enable charging current to flow and low to

inhibit charging- current flow.

Functional Description

The bq2000 is a versatile, multi-chemistry battery-

charge control device. See Figure 1 for a functional block

diagram and Figure 2 for a state diagram.

bq2000

bq2000BD.eps

Voltage

Reference

Internal

OSC

Clock

Phase

Generator

ADC

OSC

SNS

MOD

BAT

LED

VCC VSS

Timer

PVD

ALU

Voltage

Comparator

Voltage

Comparator

Charge

Control

Figure 1. Functional Block Diagram

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