BQ2000TPN datasheet(2/16 Pages) TI

2 / 16 page

Pin Descriptions

SNS

Current-sense input

Enables the bq2000T to sense the battery

current via the voltage developed on this pin

by an external sense-resistor connected in

series 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 bq2000T is a versatile, multi-chemistry battery-

charge control device. See Figure 1 for a functional block

diagram and Figure 2 for the state diagram.

bq2000T

BD2000T.eps

Voltage

Reference

Internal

OSC

Clock

Phase

Generator

ADC

OSC

SNS

MOD

BAT

LED

VCC VSS

Timer

∆T/∆t

ALU

Voltage

Comparator

Voltage

Comparator

Charge

Control

Figure 1. Functional Block Diagram

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