Texas Instruments BQ2114MODULE, BQ2114LMODULE, BQ2114LB-KT, BQ2114LB-018, BQ2114LB-016 Datasheet

bq2114

NiCd or NiMH Gas Gauge Module

with Charge-Control Output

Features

Complete bq2014 Gas Gauge solution for NiCd or NiMH battery packs

Charge-control output allows communication to external charge controller (bq2004)

Battery information available over a single-wire bidirectional serial port

Battery state-of-charge monitoring for 4- to 12-cell series applications

On-board regulator allows direct connection to the battery

“L” version includes push-button activated LEDs to display state-of-charge information

Nominal capacity and cell chemistry pre-configured

Compact size for battery pack integration

General Description

The bq2114 Gas Gauge Module provides a complete and compact solution for capacity monitoring of NiCd and NiMH battery packs. Designed for battery pack integration, the bq2114 incorporates a bq2014 Gas Gauge IC, a current sense resistor, and all other components necessary to accurately monitor and display the capacity of 4 to 12 series cells. The bq2114L includes five surfacemounted LEDs to display remaining capacity in 20% increments of the learned capacity (relative mode). The LEDs are activated with the onboard push-button switch.

Contacts are provided on the bq2114 for direct connection to the battery stack (BAT+, BAT-), the serial communications port (DQ), the empty indicator (EMPTY), and the charge control output (CHG). Please refer to the bq2014 data sheet for the specifics on the operation of the Gas Gauge.

Unitrode configures the bq2114 based on the information requested in Table 1. The configuration defines the number of series cells, the nominal battery pack capacity, and the self-discharge rate.

A module development kit is also available for the bq2114. The bq2114B-KT or bq2114LB-KT includes one configured module and the following:

1)An interface board that allows connection to the serial port of an AT-compatible computer.

2)Menu-driven software with the bq2114 to display charge/discharge activity and to allow user interface to the bq2014 from any standard DOS PC.

3)Source code for the TSR.

Pin Descriptions

P1	DQ/Serial communication port
P2	BAT+/Battery positive/pack positive
P3	CHG/Charge control output
P4	EMPTY/Empty indicator output
P5	GND/Ground
P6	PACK-/Pack negative
P7	BAT-/Battery negative

5/99 B

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bq2114

Battery Pack

Cells

P7

bq2114 P2

P6

PACK-

PACK+

Load

Charger

FG211401.eps

Figure 1. Module Connection Diagram

Table 1. bq2114 Module Configuration

Customer Name: ___________________________________________________________________________

Contact: _________________________________________ Phone: ______________________________

Address: _________________________________________________________________________________

_________________________________________________________________________________

Sales Contact: ____________________________________			Phone: ______________________________
Number of series battery cells (4–12)	________________________________________
Battery type (NiCd or NiMH)	________________________________________
Battery pack capacity (mAh)	________________________________________
Discharge rate into load (3.0A max.)	Min.		Avg.		Max.
Charge rate (3.0A max.)	________________________________________
LEDs and switch (Y/N)	________________________________________
FAE approval: _____________________________________			Date:________________________________

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bq2114

bq2114 Schematic

Note: Schematic shows components which may not be placed on the board, depending upon the configuration.

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