bq2016

GAS GAUGE IC FOR

HIGH DISCHARGE RATES

SLUS475A – JANUARY 2001 – REVISED NOVEMBER 2002

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POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

D Provides Accurate Measurement of

Available Capacity in Nicd or NiMH

Batteries

D Measures a Wide Dynamic-Current Range

D Requires ≤ 1 Square Inch of PCB Space for

Easy Pack Integration

D Measures Charge Flow Using a Low-Offset

V-to-F Converter

D Automatically Compensates Measurements

for Rate and Temperature

D Supports 5 LEDs for Remaining Capacity

Indication

D Provides a 1-Wire HDQ Communication

Interface

D Packaging: 28-Pin SSOP

description

The bq2016 gas gauge IC for battery pack or in-system installation maintains an accurate record of available

battery capacity. To integrate charge and discharge activity of the battery, the IC monitors a voltage drop across

a sense resistor connected in series with the cells of the battery. The bq2016 compensates for battery

temperature, charge/discharge rate, and battery self-discharge to the charge counter to provide available-

capacity information across a wide range of operating conditions. The bq2016 works with NiCd or NiMH battery

packs that have a capacity of 1 to 4.5 Ah and that are designed for high discharge rate applications such as

power tools.

The VPFC input sets the initial full charge reference of the battery pack. The bq2016 learns the true discharge

capacity of the battery pack and automatically updates the full-charge reference during the course of a

discharge cycle from full to empty. The remaining capacity is reported as the ratio between the actual discharge

capacity and the full-charge capacity. The bq2016 communicates available capacity using 5 LEDs or the 1-wire

communications port.

The 1-wire serial communication port (5Kb/s) allows an external processor to read and write the internal

registers of the bq2016. Communication with the bq2016 is useful for pack testing or host processing of the

available battery information. The internal registers include available battery capacity, voltage, temperature,

current, and battery status. The RBI input maintains the register set in the event of pack voltage collapse due

to a high discharge pulse.

The bq2016 circuit can operate from the cells in the pack. The REG output and an external FET provide a simple,

inexpensive voltage regulator to supply power to the circuit from the cells

OPTIONS

TJ

28-PIN SSOP PACKAGE

–20

°C to 70°C

bq2016DBQ

bq2016DBQR

Copyright

 2002, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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28

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HDQ

NC

NC

RBI

REG

NC

VCC

VSS

DISP

LED1

LED2

LED3

LED4

LED5

NC

NC

SB

PROG

VPFC

NC

SR1

SR2

SRC

TS

THON

CVON

NC

NC

TSSOP PACKAGE

(TOP VIEW)

NC — Do not connect