Features

Ø

Safe management of fast charge for NiCd, NiMH, or

Li-Ion battery packs

Ø

On-board switching regulation for up to 3A charge

current (set to 1A for shipment)

Ø

Fast-charge termination by peak voltage, minimum

current (Li-Ion), maximum temperature, or

maximum charge time

Ø

Programmable charge rate and time-out

Ø

Programmable top-off option for NiMH packs

Ø

Trickle charge for conditioning deeply discharged

batteries

Ø

Charge-status LED

Ø

Direct battery connection

General Description

The DV2000S1 and DV2000TS1 are complete develop-

ment and evaluation environments for bq2000

multi-chemistry charge- control ICs. The DV2000S1 and

DV2000TS1 support up to 4 Li-Ion or 10 NiCd/NiMH

cells and can be user-programmed for other cell counts.

Charge qualification precedes fast charge. During quali-

fication, full-charge current is inhibited if the battery

voltage or temperature is outside predetermined and

user-defined thresholds, indicating a battery pack that

is deeply discharged, shorted, hot, or cold. During the

qualification interval, the LED flashes at a 1Hz rate. In

the case of a low battery voltage, the IC applies a

low-current trickle charge in an attempt to revive the

battery or to close the pack protector’s discharge switch.

When battery voltage and temperature reach the re-

quired thresholds, full charge begins.

The bq2000 completes the fast charge with the appropri-

ate charge algorithm. If the voltage on BAT input rises

to the internal V

battery. Otherwise, the bq2000 assumes NiCd/NiMH

chemistry. The user can further customize the algorithm

by programming the device for top-off option

(NiCd/NiMH only) and time-out period.

Please review the bq2000 data sheet before using the

DV2000S1 and DV2000TS1 boards.

Connection Descriptions

J1

THERM

Thermistor connection

BAT-

Negative battery terminal and

thermistor return

BAT+

Positive battery terminal

N/C

No connection

DC-

Charger supply ground

DC+

Charger supply positive

JP1

Top-off selection for NiCd or NiMH

JP2

Number of cell selection for Li-Ion

JP3

Number of cell selection for NiCd or

NiMH

Fixed Configuration

The DV2000S1 and DV2000TS1 boards have the following

fixed characteristics :

1

DV2000S1 and DV2000TS1

Multi-Chemistry Switching Charger

Development System

SLUU006A–June 1999—Revised OCTOBER 2000

Rev. D Board