Datasheet BQ2111LMODULE, BQ2111LB-KT Datasheet (Texas Instruments)

Features

ä

Complete bq2011 Gas Gauge solution for NiCd
packs in high discharge rate applications

ä

Five surface-mounted LEDs to display
state-of-charge information

ä

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

ä

On-board regulator allows direct connection to the
battery

ä

Battery information available over a single-wire
bidirectional serial port

ä

Nominal capacity pre-configured

ä

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.

4

bq2111L Board

bq2111L

5

Absolute Maximum Ratings

Symbol Parameter Minimum Maximum Unit Notes

V

CC

Relative to V

SS

-0.3 +7.0 V bq2011

All other pins Relative to V

SS

-0.3 +7.0 V bq2011

T

OPR

Operating temperature 0 +70 °C Commercial

T

STR

Storage temperature -40 +85 °C

Note: Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional opera

-

tion should be limited to the Recommended DC Operating Conditions detailed in this data sheet. Expo

-

sure to conditions beyond the operational limits for extended periods of time may affect device reliability.

DC Electrical Characteristics (T

A=TOPR

)

Symbol Parameter Minimum Typical Maximum Unit Conditions/Notes

NumCell

Number of series cells in
battery pack

4 - 12 -

BAT+ Positive terminal of pack GND

NumCell 1.2V* NumCell 1.8V*

V

V

SR

Voltage across the sense re­sistor, P4 to P5

-0.3 - 2 V

V

CC

Supply voltage (direct cell
operation)
LBAT+

3.0 4.8 7.2 V

I

CC

Supply current at BAT+
terminal (no external
loads)

- 120 250

µ

A

R

DQ

Internal pull-down 500k - -

Ω

1

I

OL

Open-drain sink current
DQ

- - 5.0 mA

1

V

OL

Open-drain output low, DQ - - 0.5 V1IOL< 5mA

V

IHDQ

DQ input high 2.5 - - V

1

V

ILDQ

DQ input low - - 0.8 V

1

V

OS

Voltage offset 150

µ

V

1

bq2111L

Note: 1. Characterized on PCB, IC 100% tested.

6

DC Voltage Thresholds (T

A

= T

OPR

)

Symbol Parameter Minimum Typical Maximum Unit Notes

V

EDV

Final empty warning 0.87 0.90 0.93 V BAT+/NumCell

1

V

MCV

Maximum single-cell voltage 1.95 2.0 2.05 V BAT+/NumCell

1

V

SR1

Discharge compensation threshold 20 50 75 mV VSR+ V

OS

2

V

SR2

Discharge compensation threshold 70 100 125 mV VSR+ V

OS

2

V

SR3

Discharge compensation threshold 120 150 175 mV VSR+ V

OS

2

V

SR4

Discharge compensation threshold 220 253 275 mV VSR+ V

OS

2

V

SRO

Sense resistor sense range -300 - +2000 mV VSR+ V

OS

2

V

SRQ

Valid charge - - -400

µ

VVSR+ V

OS

2

V

SRD

Valid discharge 500 - -

µ

VVSR+ V

OS

2

Notes: 1. At SB input of bq2011

2. At SR input of bq2011

bq2111L

Ordering Information

bq2111L B —

Customer Code:

Blank = Sample or Pre-production

1

KT = Evaluation system
XXX = Customer-specific; assigned by Unitrode

2

Package Option:

B = Board-level product

Device:

NiCd Gas Gauge Module with LEDs

Notes: 1. Requires configuration sheet (see Table 1)

2. Example production part number: bq2111LB-001

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