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

Features

ä

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

ä

Accurate battery state-of-charge monitoring

ä

Reliable fast charge termination

ä

Automatic full capacity calibration

ä

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

ä

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

ä

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

P1

DQ/Serial communication port

P2

BAT+/Battery positive

P3

PACK+/Pack positive

P4

PACK-/Pack negative

P5

BAT-/Battery negative

P6

THERM+/Thermistor positive

P7

THERM-/Thermistor negative

P8

MOD/Fast charge control output

1

NiCd or NiMH Gas Gauge Module

with Fast-Charge Control

bq2164

9/96

5-2

bq2164

FG216401.eps

Battery Pack

P5

P4

bq2164

Load

Charger

Cells

PACK+PACK-

P2

P3

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

5-3

bq2164

200K

R21

BAT+

VIN

GND

VOUT

SCI7710YBA

U2

1

2

3

BAT+

P4

VCC

P2

P3

10K

R14

10K

R13

SI9430DY

Q3

5678

FMMT3904

Q2

300K

R18

TP9

VCC

100K

R20

100K

R19

BAV70

D2

P8

1

BAV99

D1

100K

R2

100

R4

P1

VCC

0.1UF

C2

0.1UF

C3

R3

VCC

10K

R17

P5

SENSE_RESISTOR

R15A

100K

R1

0.1UF

C1

SNS

LED1

LED2

VSS

VCC

MOD

DIS

INH

BAT

TS

TCO

TM2

TM1

VSEL

DSEL

DCMD

BQ2004

U1

1
2
3
4
5
6
7
89

10

11

12

13

14

15

16

1K

R32

VCC

1K

R35

1K

R36

1K

R37

1K

R341KR33

RB_TCO

R6

RA_TCO

R5

0.1UF

C7

0.1UF

C4

TP3

100K

R10

100K

R11

100K

R16

0.1UF

C5

VCC

0.1UF

C6

100K

R9

RB_TS

R8

RA_TS

R7

P7

CHG

DISP

DONE

SR

SB

EMPTY

DQ

REF

VSS

SEG5

SEG4

SEG3

SEG2

SEG1

VCCLCOM

BQ2014

U3

1
2
3
4
5
6
710

11

12

13

14

15

16

P6

100K

R26

100K

R31

100K

R25

100K

R30

100K

R24

100K

R29

100K

R23

100K

R28

100K

R27

100K

R22

VCC

VCC

R15B

R15C

R15D

FMMT3904

Q1

TP4

TP1

TP2

TP10

TP5
TP6
TP7
TP8

TP11

TP12

FMMT3904

Q4

TP13

BAV70

D3

BAT+

PACK+

DQ

BAT-

MOD

THERM+

PACK-

THERM-

bq2164 Schematic

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

board, depending on the configuration.

5-4

bq2164

bq2164 Board

5-5

bq2164

Absolute Maximum Ratings

Symbol Parameter Minimum Maximum Unit Notes

P

SR

Continuous sense resis

-

tor power dissipation

- 3 W Thru-hole sense resistor

- 1 W Surface-mount sense resistor

V

CHG

Charging voltage - 20 V

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 cells in battery
pack

5 - 10 -

BAT+ Positive terminal of pack GND

NumCell 1.2V* NumCell 1.8V*

V

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

I

CC

Supply current at BAT+ ter

-

minal (no external loads)

- 200 300

µ

A

I

CHG

Charge current - - 2 A

I

DSCHG

Discharge current - - 2 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

IHDQ

DQ input low - - 0.8 V

1

V

OS

Voltage offset 150

µ

V

1

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

5-6

bq2164

DC Voltage and Temperature Thresholds (T

A=TOPR

)

Symbol Parameter Minimum Typical Maximum Unit Notes

V

EDVF

Final empty warning 0.93 0.95 0.97 V BAT+/NumCell

1

V

EDV1

First empty warning 1.03 1.05 1.07 V BAT+/NumCell

1

V

MCV

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

1

V

SRO

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

OS

2

V

SRQ

Valid charge 375 - -

µ

VVSR+V

OS

2, 3

V

SRD

Valid discharge - - -300

µ

VVSR+V

OS

2, 3

V

SR1

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

OS

2

T

LTF

Low-temperature charging fault - 10 - °C

Low-temperature charge
inhibit/terminate

4

T

HTF

High-temperature charging fault - 45 - °C

High-temperature
charge inhibit

V

EDVC

Minimum charging cell voltage - 1 - V

Minimum cell voltage
to initiate charge

V

MCVC

Maximum charging cell voltage - 2 - V

Maximum cell voltage to
initiate or continue charge

R

∆T/∆

t

∆T/∆

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

T

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

1

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

2

Package Option:

B = Board-level product

Device:

NiCd or NiMH Gas Gauge Module with Fast-Charge Control

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