Datasheet BQ2145MODULE, BQ2145LMODULE, BQ2145LB-KT, BQ2145B-KT Datasheet (Texas Instruments)

Features

ä

Complete smart battery solution for NiCd, NiMH,
and Li-Ion battery packs

ä

Based on the bq2945 Gas Gauge IC

ä

Accurate measurement of available battery
capacity

ä

Designed for battery pack integration:

–

Measures only 2.5 (L) x 0.7 (W) inches

–

Includes Gas Gauge IC, configuration
EEPROM, and sense resistor

–

Five onboard state-of-charge LEDs with
push-button activation

–

Low operating current for minimal battery
drain

ä Critical battery information available over two-wire

serial port

General Description

The bq2145 Smart Battery Module provides a complete
solution for the design of intelligent battery packs. The
bq2145 uses the SMBus protocol and supports Smart
Battery Data commands in the SMB/SBD specifications.
Designed for battery pack integration, the bq2145 com

­bines the bq2945 Gas Gauge IC with a serial EEPROM
on a small printed circuit board. The board includes all
the necessary components to accurately monitor battery
capacity and communicate critical battery parameters to
the host system or battery charger. The bq2145 also in

­cludes five LEDs. The push-button switch activates the
LEDs to show remaining battery capacity in 20% incre

­ments.

Contacts are provided on the bq2145 for direct connec

­tion to the battery stack (B+, B-) and the two-wire inter

­face (C, D). Please refer to the bq2945 data sheet for
specific information on the operation of the Gas Gauge
and communication interface.

Unitrode configures the bq2145 based on the informa

­tion requested in Table 1. The configuration defines the
pack voltage, capacity, and chemistry and charge control
parameters. The Smart Battery Module uses the on

­board sense resistor to track charge and discharge activ

­ity of the battery pack. Figure 1 shows how the module
connects to the cells.

A module development kit is also available for the
bq2145. The bq2145B-KT or the bq2145LB-KT includes
one configured module and the following:

1) An EV2200-45 interface board that allows connec­tion to the serial port of any AT-compatible com­puter.

2) Menu-driven software to display charge/discharge
activity and to allow user interface to the Gas
Gauge IC and serial E

2

PROM from any standard

Windows 95 or 3.1x PC.

Pin Descriptions

B+

BAT+/Battery positive/Pack positive

P-

PACK-/Pack negative

C

SMBC/Communications clock

D

SMBD/Serial data

B-

BAT-/Battery negative

CP2

Control pin 2

CP1

Control pin 1

1

Smart Battery Module with LEDs

Preliminary

bq2145

5/99

2

FG2145-1.eps

Battery Pack

B-

P-

B+bq2145

Load

Charger

Cells

PACK+PACK-

Figure 1. Module Connection Diagram

bq2145

Preliminary

3

Customer Name: ______________________________________________________________________________________________
Contact: _______________________________________________________ Phone:____________________________
Address:________________________________________________________________________________________________
Sales Contact: __________________________________________________ Phone: ____________________________

Board Configuration
LEDs and switch ________________ Yes or No
Display mode ________________ Relative or Absolute
Discharge rate (3.0A max.) Min ____________ Avg ____________ Max ___________
Duration at max. discharge ________________
Number of series cells ________________

EEPROM Configuration Typical Values

NiMH Li-Ion
Remaining time alarm (min) _______________ Sets the low time alarm level 10 min 10 min
Remaining capacity alarm

(mAh)

_______________ Sets the low capacity alarm level C/10 C/10

Charging voltage (mV) _______________ Sets the requested charging voltage 65535 4.1V/cell
Design cpaacity (mAh) _______________ Defines the battery pack capacity 3000 3600
Design voltage (mV) _______________ Defines the battery pack voltage 12000 10800
Manufacturer date _______________ Battery pack manufacturer date mm/dd/yy mm/dd/yy
Serial number _______________ Battery pack serial number 0-65535 0-65535
Fast-charging current (mA) _______________ Sets the requested charging current 1C 1C
Maintenance charging

current (mA) _______________

Sets the requested maintenance charging

current C/20 0
Li-Ion taper current (mA) _______________ Sets the upper limit for charge termination NA C/10
Maximum overcharge (mAh) _______________ Sets the maximum amount of overcharge 256mAh 128mAh

Maximum temperature (°C)

_______________ Sets the maximum charge temperature

61°C61°C

∆T/∆t (°C/min)

_______________ Sets the termination rate 3°C/3min 4.6°C/20s

Fast-charge efficiency (%) _______________ Sets the fast-charge efficiency factor 95% 100%
Maintenance charge effi

-

ciency (%)

_______________ Sets the maintence charge efficiency factor 80% 100%

Self-discharge rate (%/day) _______________ Sets the batterys self-discharge rate 1.5%/day 0.2%/day
EDV1 (mV) _______________ Sets the initial end-of-discharge warning 1.05V/cell 3.0V/cell
EDVF (mV) _______________ Sets the final end-of-discharge warning 1.0V/cell 2.8V/cell

Hold-off timer for ∆T/∆t (sec.)

_______________

Sets the hold off period for ∆T/∆t

termination

180s 320s

Manufacturer name _______________ Programs manufacturer’s name (11 char.

max)

bq bq

Device name _______________ Programs device name (7 char. max) bq36 bq202
Chemistry _______________ Programs pack’s chemistry (7 char. max) NiMH LION
Manufacturer data _______________ Open field (5 char. max) 2040 2040
FAE Approval ____________________________________ Date: ____________

Table 1. bq2145 Module Configuration

Preliminary

bq2145

4

D

1

100K

R17

1

2

BZX84C6V2

D9

1

2

3

OPTIONAL

C4

12

330

R16

12

P-

1

0.1UF

C5

12

B+

1

TP6

1

C

1

100

R6

12

TP1

1

TP2

1

100

R8

12

TP3

1

CP2

1

VCC

330

R15

12

SDA

SCL

WP

VCC

VSS

A2

A1

A0

24LC01

U2

1
2
3
45

6

7

8

330

R3

12

VCC

10K

R12

1

2

10K

R13

1

2

COLOR

D3

12

COLOR

D4

12

BAV99

D7

1

2

3

VCC

R11

12

1%

B-

1

R5

1

2

1%

R4

1

2

1%

0.1UF

C1

1

2

0.1UF

C3

1

2

100

R18

12

100K

R10

12

COLOR

D5

12

330

R2

12

COLOR

D2

12

DISPLAY

SW1

12

3 4

100

R9

12

100

R7

12

BAV99

D6

1

2

3

2N7002

Q1

1

2

3

TP4

1

BAV99

D8

1

2

3

COLOR

D1

12

VCC

0.1UF

C2

12

TP5

1

330

R14

12

3W

0.05

R1

1

2

BSS84ZX

Q2

1

2

3

CP1

1

CP2

CPI DISP

SMBD

SMBC

VOUTVCC

SR

SB

REF

VSS

SEG5

SEG4

SEG3

SEG2

SEG1

bq2945

U1

1
2
3
4
5
6
7
8

10
9

11

12

13

14

15

16

TP7

1

BAW56

D10

1

2

3

SMBC

SMBD

BAT+

BAT-

1

SEE CHART 1 FOR RESISTOR VALUES.1

11

1

86.5K1M

909K

604K

402K

162K

909K

909K

86.5K

909K

NiMH

100K

100K

100K

100K

100K

100K

100K

909K

806K

698K

499K

698K

499K

301K

R4

LiION

12

10

9

8

6

4

3

2

CHART 1

# OF CELLS R11R5

PACK-

OPTIONAL 6.2V

bq2145 Schematic

bq2145

Preliminary

5

bq2145 Board

Preliminary

bq2145

6

bq2145

Preliminary

bq2145 B – XXX

Package Option:

B = Board-level product

Device:

Smart Battery Module with LEDs

Customer Code:

Blank = Sample or Pre-production

1

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

2

Ordering Information

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

2. Example production part number: bq2145LB-001

LED Option:

L = LEDs plus switch
Blank = No LEDs or switch

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