BQ2016 Datasheet, PDF (1/21 Pages) Texas Instruments – GAS GAUGE IC FOR HIGH DISCHARGE RATES

bq2016
GAS GAUGE IC FOR
HIGH DISCHARGE RATES
SLUS475A – JANUARY 2001 – REVISED NOVEMBER 2002
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
TSSOP PACKAGE
(TOP VIEW)
HDQ ₁
NC ₂
NC ₃
RBI 4
REG 5
NC 6
V_CC 7
V_SS 8
DISP 9
LED1 10
LED2 11
LED3 12
LED4 13
LED5 14
28 ^NC
27 ^NC
26 ^SB
25 PROG
24 VPFC
23 NC
22 SR1
21 SR2
20 SRC
19 TS
18 THON
17 CVON
16 NC
15 NC
description
NC — Do not connect
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
TJ
–20°C to 70°C
OPTIONS
28-PIN SSOP PACKAGE
bq2016DBQ
bq2016DBQR
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.
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.
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Copyright  2002, Texas Instruments Incorporated
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