Texas Instruments BQ2112MODULE, BQ2112LMODULE, BQ2112LB-KT, BQ2112LB-019, BQ2112B-KT Datasheet
Features
ä
Complete bq2012 Gas Gauge solution for NiCd or
NiMH battery packs
ä
Output for slow-charge control of battery pack
ä
Battery information available over a single-wire
bidirectional serial port
ä
Battery state-of-charge monitoring for 4- to 12-cell
series applications
ä
On-board regulator allows direct connection to the
battery
ä
“L” version includes push-button activated LEDs to
display state-of-charge information
ä
Nominal capacity and cell chemistry pre-configured
ä Compact size for battery pack integration
General Description
The bq2112 Gas Gauge Module provides a complete and
compact solution for capacity monitoring of NiCd and
NiMH battery packs. Designed for battery pack integration, the bq2112 incorporates a bq2012 Gas Gauge IC, a
current sense resistor, and all other components necessary to accurately monitor and display the capacity of 3
to 12 series cells. The bq2112L includes six surfacemounted LEDs to display remaining capacity in 20% in
-
crements of the learned capacity (relative mode) or pro
grammed capacity (absolute mode). The sixth LED is
used in absolute mode to represent an overfull condition
(charge above the programmed capacity). The LEDs are
activated with the onboard push--button switch.
Contacts are provided on the bq2112 for direct connec
tion to the battery stack (BAT+, BAT-), the serial com
munications port (DQ), the empty indicator (EMPTY),
and the charge control output (CHG
). Please refer to the
bq2012 data sheet for the specifics on the operation of
the Gas Gauge.
Unitrode configures the bq2112 based on the informa
tion requested in Table 1. The configuration defines the
number of series cells, the nominal battery pack capac
ity, the self-discharge rate, and the LED display mode.
A module development kit is also available for the
bq2112. The bq2112B-KT or bq2112LB-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 bq2112 to display
charge/discharge activity and to allow user interface to the bq2012 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
1
bq2112
5/99 B
NiCd or NiMH Gas Gauge Module
with Slow-Charge Control
2
bq2112
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) ________________________________________
Display mode (absolute or relative) ________________________________________
LEDs and switch (Y/N) ________________________________________
FAE approval: _____________________________________ Date: ________________________________
Table 1. bq2112 Module Configuration
FG-961
Charger
Load
P7
P6
P2
bq2112
Cells
Battery Pack
PA CK +
PACK-
Figure 1. Module Connection Diagram
3
bq2112
bq2112 Schematic
Note: Schematic shows components which may not be placed on the
board, depending upon the configuration.
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