Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsDev KitsPCB design board

Features

Safe management of fast charge for NiCd, NiMH, or

Li-Ion battery packs

On-board switching regulation for up to 3A charge

current (set to 1A for shipment)

Fast-charge termination by peak voltage, minimum

current (Li-Ion), maximum temperature, or

maximum charge time

Programmable charge rate and time-out

Programmable top-off option for NiMH packs

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

MCV

threshold, the IC assumes a Li-Ion

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

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 :

DV2000S1 and DV2000TS1

Multi-Chemistry Switching Charger

Development System

SLUU006A–June 1999—Revised OCTOBER 2000 Rev. D Board

Summary of content (5 pages)

PAGE 1
DV2000S1 and DV2000TS1 Multi-Chemistry Switching Charger Development System 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 batterie
PAGE 2
DV2000S1 and DV2000TS1 An external DC supply is required to power the board. Please see the Recommended DC Operating Conditions. between the THERM and BAT- contacts on J1, temperature values are as follows: – VCC (5V) for the bq2000 is regulated on-board from the DC input on J1. LED1 indicates the charge status according to the bq2000 data sheet. Number of Cells Selection (JP2, JP3): These jumpers set the number of cells for either Li-Ion or NiCd/NiMH batteries.
PAGE 3
DV2000S1 and DV2000TS1 Recommended DC Operating Conditions Symbol Description Minimum Typical Maximum Unit Notes IDC Maximum input current - - 3 A VDC Maximum input voltage 10 (see note) - 25 V DC+ to DC- VBAT BAT input voltage - - 24 V BAT+ to BAT- VTHERM THERM input voltage 0 - 5 V Therm to BAT- ICHG Battery charge current - - 3 A Note: VDC must be above the battery charge voltage.
PAGE 4
DV2000S1 and DV2000TS1 DV2000S1 and DV2000TS1 Board Schematic Rev.
PAGE 5
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.