Datasheet BQ2164MODULE, BQ2164B-KT, BQ2164B-010, BQ2164B-009, BQ2164B-007 Datasheet (Texas Instruments)

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Features

Complete bq2004/bq2014 battery management solution for NiCd or NiMH pack

Accurate battery state-of-charge monitoring

Reliable fast charge termination

Automatic full capacity calibration

Battery information available over a single-wire bi-directional serial port

Nominal capacity, cell chemistry, and charge control parameters pre-configured

Compact size for battery pack integration

General Description

The bq2164 Gas Gauge Module provides a complete and compact battery management solution for NiCd and NiMH battery packs. Designed for battery pack integration, the bq2164 combines the bq2014 Gas Gauge IC with the bq2004 Fast-Charge IC on a small printed circuit board. The board includes all the necessary components to accurately monitor the capacity and reliably terminate fast charge of 5 to 10 series cells.

The gas gauge IC uses the onboard sense resistor to track charge and discharge activity of the battery pack. The fast charge IC gates a current-limited or constant-current charg

ing supply connected to PACK+. Charging termination is based on∆T/∆tor-∆V/PVD, maximum temperature, time, and voltage. The bq2004 signals charge completion to the bq2014 to indicate full capacity. The charge complete signal to the gas gauge eliminates the need to fully cycle the bat

tery pack to initially calibrate full pack capacity.

Contacts are provided on the bq2164 for direct connec

tion to the battery stack (BAT+, BAT-), the gas gauge's communications port (DQ), and the thermistor (THERM+, THERM). The thermistor is required for temperature fast charge termination. Please refer to the bq2004 and bq2014 data sheets for the specifics on the operation of the gas gauge and the fast charge ICs.

Unitrode configures the bq2164 based on the informa

tion requested in Table 1. The configuration defines the number of series cells, the nominal battery pack capacity, the self-discharge rate, and the fast charge control parameters. The control parameters depend on the charge rate, cell chemistry and termination technique

specified in the configuration table. They consist of the fast charge hold-off, safety timers, and the pulse trickle rate as shown in the bq2004 data sheet. The bq2164 is optimized for temperature termination with the thermistor provided with the development kit. Figure 1 shows how the module con

nects to the cells.

The sense resistor value and type should also be specified on the configuration sheet. The two options available are a 3W through-hole type or a 1W surface-mount type. Please refer to the application note entitled “A Tutorial for Gas Gauging” to select the proper value.

A module development kit is also available for the bq2164. The bq2164B-KT includes one configured module and the following:

1) A serial interface board that allows connection to the RS-232 port of an AT-compatible computer.

2) Menu-driven software with the bq2164 to display charge/discharge activity and to allow user inter

face to the bq2014 from any standard DOS PC.

3) Source code for the TSR.

4) A Philips 10K NTC Thermistor type 2322-640-

63103.

Pin Description

DQ/Serial communication port

BAT+/Battery positive

PACK+/Pack positive

PACK-/Pack negative

BAT-/Battery negative

THERM+/Thermistor positive

THERM-/Thermistor negative

MOD/Fast charge control output

NiCd or NiMH Gas Gauge Module

with Fast-Charge Control

bq2164

9/96

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bq2164

FG216401.eps

Battery Pack

bq2164

Load

Charger

Cells

PACK+PACK-

Figure 1. Module Connection Diagram

Customer Name: ___________________________________________________________________________

Contact: _________________________________________ Phone: ______________________________

Address: _________________________________________________________________________________

_________________________________________________________________________________

Sales Contact: ____________________________________ Phone: ______________________________

Number of series battery cells (5-10) ________________________________________

Battery type (NiCd or NiMH) ________________________________________

Battery pack capacity (mAh) ________________________________________

Discharge rate into load (2.0A max.) Min.

Avg. Max.

Sense resistor type: (Thru-hole (3W) or surface-mount (1W)) ________________________________________

Sense resistor size in mΩ(0.1Ωstandard) ________________________________________

Fast charge current (2.0A max.) ________________________________________

Charge voltage (V) ________________________________________

Temperature termination (enabled/disabled) ________________________________________

PVD or -∆V termination ________________________________________

FAE Approval _____________________________________ Date ________________________________

Table 1. bq2164 Module Configuration

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bq2164

200K

R21

BAT+

VIN

GND

VOUT

SCI7710YBA

BAT+

VCC

10K

R14

10K

R13

SI9430DY

5678

FMMT3904

300K

R18

TP9

VCC

100K

R20

100K

R19

BAV70

BAV99

100K

100

VCC

0.1UF

VCC

10K

R17

SENSE_RESISTOR

R15A

100K

0.1UF

SNS

LED1

LED2

VSS

VCC

MOD

DIS

INH

BAT

TCO

TM2

TM1

VSEL

DSEL

DCMD

BQ2004

1 2 3 4 5 6 7 89

R32

VCC

R35

R36

R37

R341KR33

RB_TCO

RA_TCO

0.1UF

TP3

100K

R10

100K

R11

100K

R16

0.1UF

VCC

0.1UF

100K

RB_TS

RA_TS

CHG

DISP

DONE

EMPTY

REF

VSS

SEG5

SEG4

SEG3

SEG2

SEG1

VCCLCOM

BQ2014

1 2 3 4 5 6 710

100K

R26

100K

R31

100K

R25

100K

R30

100K

R24

100K

R29

100K

R23

100K

R28

100K

R27

100K

R22

VCC

R15B

R15C

R15D

FMMT3904

TP4

TP1

TP2

TP10

TP5 TP6 TP7 TP8

TP11

TP12

FMMT3904

TP13

BAV70

BAT+

PACK+

BAT-

MOD

THERM+

PACK-

THERM-

bq2164 Schematic

Note: Schematic shows components that may not be placed on the

board, depending on the configuration.

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bq2164

bq2164 Board

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bq2164

Absolute Maximum Ratings

Symbol Parameter Minimum Maximum Unit Notes

Continuous sense resis

tor power dissipation

- 3 W Thru-hole sense resistor

- 1 W Surface-mount sense resistor

CHG

Charging voltage - 20 V

OPR

Operating temperature 0 +70 °C Commercial

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 cells in battery pack

5 - 10 -

BAT+ Positive terminal of pack GND

NumCell 1.2V* NumCell 1.8V*

BAT- Negative terminal of pack GND - 0.3 - GND+2.0 V

Supply current at BAT+ ter

minal (no external loads)

- 200 300

CHG

Charge current - - 2 A

DSCHG

Discharge current - - 2 A

Internal pull-down 500k - -

Ω

Open-drain sink current DQ - - 5.0 mA

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

IHDQ

DQ input high 2.5 - - V

IHDQ

DQ input low - - 0.8 V

Voltage offset 150

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

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bq2164

DC Voltage and Temperature Thresholds (T

A=TOPR

)

Symbol Parameter Minimum Typical Maximum Unit Notes

EDVF

Final empty warning 0.93 0.95 0.97 V BAT+/NumCell

EDV1

First empty warning 1.03 1.05 1.07 V BAT+/NumCell

MCV

Maximum single-cell voltage 2.20 2.25 2.30 V BAT+/NumCell

SRO

SR sense range -300 - +2000 mV VSR+ V

SRQ

Valid charge 375 - -

VVSR+V

2, 3

SRD

Valid discharge - - -300

VVSR+V

2, 3

SR1

Discharge compensation threshold -120 -150 -180 mV VSR+ V

LTF

Low-temperature charging fault - 10 - °C

Low-temperature charge inhibit/terminate

HTF

High-temperature charging fault - 45 - °C

High-temperature charge inhibit

EDVC

Minimum charging cell voltage - 1 - V

Minimum cell voltage to initiate charge

MCVC

Maximum charging cell voltage - 2 - V

Maximum cell voltage to initiate or continue charge

∆T/∆

t charge termination rate - 1 - °C/ min. @ 30°C

TCO

Maximum charging temperature - 50 - °C

High-temperature charge termination

Notes: 1. At SB input of bq2014.

2. At SR input of bq2014.

3. Default value; value set in DMF register.

4. PVD termination disables the low-temperature fault charge termination.

Notes: 1. Requires configuration sheet (Table 1)

2. Example production part number: bq2164B-001

Ordering Information

bq2164 B —

Customer Code:

Blank = Sample or Pre-production

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

Package Option:

B = Board-level product

Device:

NiCd or NiMH Gas Gauge Module with Fast-Charge Control

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