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BQ2014H Datasheet(PDF) 1 Page - Texas Instruments

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Part No. BQ2014H
Description  Low-Cost NiCd/NiMH Gas Gauge IC
Download  28 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

BQ2014H Datasheet(HTML) 1 Page - Texas Instruments

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Features
➤ Accurate measurement of avail-
able capacity in NiCd or NiMH
batteries
➤ Low-cost battery management so-
lution for pack integration
- As little as 1
2 square inch of
PCB for complete circuit
- Low operating current (120µA
typical)
- Less than 100nA of data
retention current
➤ High-speed (5kb/s) single-wire
communication interface (HDQ
bus) for critical battery
parameters
➤ Communication with an external
charge controller such as the
bq2004
➤ Direct drive of remaining capacity
LEDs
➤ Automatic rate and temperature
compensation of measurements
➤ 16-pin narrow SOIC
General Description
The bq2014H NiCd/NiMH Gas
Gauge IC is intended for battery-
pack or in-system installation to
maintain an accurate record of
available battery capacity. The IC
monitors a voltage drop across a
sense resistor connected in series
between the negative battery termi-
nal and ground to determine
charge and discharge activity of
the battery. Compensations for bat-
tery temperature, self-discharge,
and rate of discharge are applied to
the charge counter to provide avail-
able capacity information across a
wide range of operating conditions.
Battery capacity is automatically re-
calibrated, or “learned,” in the
course of a discharge cycle from full
to empty.
Nominal available capacity may be
directly indicated using a five-
segment LED display. The bq2014H
also supports a simple single-line
bidirectional serial link to an exter-
nal processor (common ground). The
5kb/s HDQ bus interface reduces
communications overhead in the
external microcontroller.
Internal registers include available
capacity and energy, temperature,
voltage and current, and battery
status. The external processor may
also overwrite some of the bq2014H
gas gauge data registers.
The bq2014H can operate from the
batteries in the pack. The REF out-
put and an external transistor allow
a simple, inexpensive voltage regu-
lator to supply power to the circuit
from the cells.
1
bq2014H
LCOM
LED common output
SEG1/PROG1 LED segment 1/
program 1 input
SEG2/PROG2 LED segment 2/
program 2 input
SEG3/PROG3 LED segment 3/
program 3 input
SEG4/PROG4 LED segment 4/
program 4 input
SEG5/PROG5 LED segment 5/
program 5 input
DONE
Charge complete
input
1
PN20140H..eps
16-Pin Narrow SOIC
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LCOM
SEG1/PROG1
SEG2/PROG2
SEG3/PROG3
SEG4/PROG4
SEG5/PROG5
DONE
VSS
VCC
REF
NC
HDQ
RBI
SB
DISP
SR
VSS
System ground
SR
Sense resistor input
DISP
Display control input
SB
Battery sense input
RBI
Register backup input
HDQ
Serial communications
input/output
NC
No connect
REF
Voltage reference output
VCC
Supply voltage
Pin Connections
SLUS030
A–JUNE 1999 - REVISED OCTOBER 2003
Low-Cost NiCd/NiMH Gas Gauge IC
Pin Names


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