Texas Instruments BQ2111LMODULE, BQ2111LB-KT Datasheet
Features
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Complete bq2011 Gas Gauge solution for NiCd
packs in high discharge rate applications
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Five surface-mounted LEDs to display
state-of-charge information
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Battery state-of-charge monitoring for 4- to 12-cell
series applications
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On-board regulator allows direct connection to the
battery
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Battery information available over a single-wire
bidirectional serial port
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Nominal capacity pre-configured
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Compact size for battery pack integration
General Description
The bq2111L Gas Gauge Module provides a complete
and compact solution for capacity monitoring of NiCd
battery packs in high discharge rate applications such
as power tools. Designed for battery pack integration,
the bq2111L incorporates a bq2011 Gas Gauge IC, five
surface-mounted LEDs, and the other discrete components necessary to monitor and display accurately the
capacity of 4- to 12 -series cells. The only external compo-
nent required is a low-value sense resistor connected be
tween GND and PACK-. Contacts are also provided on
the bq2111L for direct connection to the battery stack
and the serial communications port (DQ). The battery
stack should be connected between BAT+ and GND.
Please refer to the bq2011 data sheet for the specifics on
the operation of the Gas Gauge.
Unitrode configures the bq2111L based on the informa
tion requested in Table 1. The configuration defines the
number of series cells and the nominal battery pack ca
pacity. The bq211L module uses the absolute LED dis
play to indicate battery capacity. In this mode, the
remaining capacity is represented as a percentage of the
programmed capacity.
The bq2111L can operate directly from four series cells
within the pack using the LBAT+ supply input. For four
series cell applications or applications using the onboard regulator, LBAT+ should be connected to BAT+.
Please refer to Figure 1 for module connection illustra
tions.
A module development kit is also available for the
bq2111L. The bq2111LB-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 bq2111L to display
charge/discharge activity and to allow user interface to the bq2011 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
LBAT+/Four--cell power
P4
PACK-/Pack negative
P5
GND/Ground
1
NiCd Gas Gauge Module with LEDs
for High Discharge Rates
bq2111L
7/96
2
bq2111L
Customer Name: ___________________________________________________________________________
Contact: _________________________________________ Phone: ______________________________
Address: _________________________________________________________________________________
_________________________________________________________________________________
Sales Contact: ____________________________________ Phone: ______________________________
Number of series battery cells (4–12) ________________________________________
Sense resistor size in m
Ω
1
________________________________________
Battery pack capacity (mAh) ________________________________________
Discharge rate(A) Min.
Avg. Max.
Charge rate (A) ________________________________________
FAE approval: _____________________________________ Date:________________________________
Table 1. bq2111L Module Configuration
Note: 1. Sense resistor is not included with board.
FG-130
Charger
Load
bq2111L
Cells
Battery Pack
P5
P4
Sense
Resistor
P3
P2
PACK+
PACK-
(b) Regulated Supply
(a) 4-Cell Supply
Charger
Load
PACK+
P2
P3
Battery Pack
P4
bq2111L
P5
Resistor
PACK-
Sense
Cells
Figure 1. Module Connection Diagram
3
bq2111L
bq2111L Example Schematic
Note: Schematic shows components which may not be placed on the
board, depending upon the configuration.
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