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Features

ä Complete bq2050H Power Gauge solution for Li-Ion

battery packs

ä Battery information available over a single-wire

(HDQ) bidirectional serial port

ä Control signals to enhance pack protection

ä Battery state-of-charge monitoring for 2- to 5-cell

series applications

ä On-board regulator allows direct connection to the

battery

ä “L” version includes push-button activated LEDs to

display state-of-charge information

ä Nominal capacity pre-configured

ä Compact size for battery pack integration

General Description

The bq2150H Power Gauge Module provides a complete

and compact solution for capacity monitoring of Li-Ion bat-

tery packs. Designed for battery pack integration, the

bq2150 incorporates a bq2150H Gas Gauge IC, a current

sense resistor, and all other components necessary to accu-

rately monitor and display the capacity of 2 to 5 series

cells.

The bq2150L includes five LEDs to display remaining ca-

pacity in 20% increments of the learned capacity.

The

LEDs are activated with the onboard push-button switch.

Contacts are provided on the bq2150H for direct connec-

tion to the battery stack (BAT+, BAT-) and the serial

communications port (HDQ). The RBI input provides

backup power to the bq2150H in the event that the cells

are removed or the battery is turned off. The bq2150H

has a 1

µF capacitor onboard connected to RBI to supply

backup power for about an hour. In battery packs that

use high-side FETs to control the charge/discharge of

the Li-Ion cells, the RBI input can be wired to a single

cell to provide prolonged data retention times. The SD

input allows an external signal (active low) to turn the

bq2050H IC off to minimize internal current consump-

tion of the battery pack and maximize storage life of the

pack in the system. When turned off, the bq2150H is

non-functional, and the RBI power source maintains

register information. Please refer to the bq2050H data

sheet for the specifics on the operation of the Gas Gauge.

Unitrode configures the bq2150H based on the informa-

tion requested in Table 1. The configuration defines the

number of series cells, the nominal battery pack capac-

ity, and the Li-Ion battery type (coke or graphite anode).

Figure 1 shows how the module connects to the cells.

A module development kit is also available for the

bq2150. The bq2150HB-KT or the bq2150HLB-KT in-

cludes one configured module and the following:

1)

An EV2200-50H interface board that allows con-

nection to the serial port of an AT-compatible com-

puter.

2)

Menu-driven software to display charge/discharge

activity and to allow user interface to the bq2150H

from any standard Windows 3.1x or 95 PC.

Pin Descriptions

P1

HDQ/Serial Communications port

P2

PSTAT/Protector status input

P3

BAT+/Battery positive/pack positive

P4

SD/Shutdown

P5

RBI/Register backup input

P6

GND/Ground

P7

PACK-/Pack negative

P8

BAT-/Battery negative

P9

CFC/Charge FET control output

1

Li-Ion Power Gauge™ Module

Preliminary

bq2150H

10/97

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2

bq2150H

Preliminary

Customer Name: ___________________________________________________________________________

Contact: _________________________________________

Phone: ______________________________

Address: _________________________________________________________________________________

_________________________________________________________________________________

Sales Contact: ____________________________________

Phone: ______________________________

Number of series battery cells (2-5)

____________________

Coke or graphite cell anode

____________________

Battery pack capacity (mAh)

____________________

Discharge rate into load (A)

min. ________  avg. _________  max. _________

Charge rate

____________________

Self-discharge compensation (Y/N)

____________________

LEDs and switch (Y/N)

____________________

FAE Approval: __________________________________

Date: _______________________________

Table 1. bq2150H Module Configuration

FG2150H1.eps

Battery Pack

P8

P7

P3

bq2150H

Load

Charger

Cells

PACK+

PACK-

Figure 1. Module Connection Diagram

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3

Preliminary

bq2150H

VCC

100K

R12

100K

R14

100K

R17

100K

R19

100K

R23

100

R25

P8

1

100K

R24

100K

R20

100K

R18

100K

R15

100K

R13

VCC

GREEN

D1

GREEN

D2

GREEN

D5

GREEN

D4

GREEN

D3

100

R11

330

R16

330

R21

330

R22

0.1UF

C3

VCC

20K

R4

2

R9

P7

1

R8

R10

P6

1

P5

1

MOMENTARY

S1

3

4

NOT_USED

R5

VCC

0.1UF

C4

1%

R7

P1

1

R6

1%

100

R1

1

2

P2

1

BAV99

D7

P3

1

2N7002

Q1

R2

BAV99

D6

CFC

PSTAT

HDQ

DISP

RBI

SR

SB

REF

VSS

SEG5

SEG4

SEG3

SEG2

SEG1

VCC

LCOM

BQ2050H

U1

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

BZX84C5V1

D9

2

P4

1

100K

R3

1

2

P9

1

0.1UF

C1

BAV99

D8

1

2

3

10K

R27

1

2

C2

0.1UF

BAV99

D10

C5

1

2

1UF

R26

HDQ

GND

CFC

BAT-

BAT+

PSTAT

RBI

SD

For PSTAT function, install R25 and D10.

If not using PSTAT, install 0   jumper at R26.

4

R7

69.8K

100K

100K

100K

1.3M

1.5M

1.1M

698K

4

4

4

Sense resistor value depends on application.

3

3

3

3

# OF CELLS

TABLE 1

1M

499K

300K

200K

5

4

3

2

R6

R2

1

1

1

2

2

2

2

2

PACK-

For 1 cell configuration install R11 and R9,

for greater than 1 cell configuration install Q1, D6, and R2.

See Table 1 for resistor values.

2

 1

2150H/9-16-97/A

bq2150H Schematic

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4

LED Option:

L = LEDs plus switch

Notes:

1.

Requires configuration sheet (Table 1)

2.

Example production part number: bq2150HLB-001

Ordering Information

bq2150H

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:

Li-Ion Power Gauge Module

bq2150H

Preliminary

bq2150H Board

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©

 1999, Texas Instruments Incorporated