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BQ2014HSN-A309 Datasheet

  • BQ2014HSN-A309

  • Low-Cost NiCd/NiMH Gas Gauge IC

  • 22頁(yè)

  • TI

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Preliminary
bq2014H
Low-Cost NiCd/NiMH Gas Gauge IC
Features
鉃?/div>
Accurate measurement of avail-
able capacity in NiCd or NiMH
batteries
鉃?/div>
Low-cost battery management so-
lution for pack integration
General Description
Th e b q 2 0 1 4 H N iC d /N iMH G a s
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-
na l a n d g r o u n d to d e t e r m i n e
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 鈥渓earned,鈥?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.
-
-
-
As little as
1 2
square inch of
PCB for complete circuit
Low operating current (120碌A(chǔ)
typical)
Less than 100nA of data
retention current
鉃?/div>
High-speed (5kb/s) single-wire
communication interface (HDQ
bus) for critical battery
parameters
鉃?/div>
Communication with an external
charge controller such as the
bq2004
鉃?/div>
Direct drive of remaining capacity
LEDs
鉃?/div>
Automatic rate and temperature
compensation of measurements
鉃?/div>
16-pin narrow SOIC
Pin Connections
Pin Names
LCOM
LED common output
V
SS
SR
DISP
SB
RBI
HDQ
NC
REF
V
CC
System ground
Sense resistor input
Display control input
Battery sense input
Register backup input
Serial communications
input/output
No connect
Voltage reference output
Supply voltage
SEG
1
/PROG
1
LED segment 1/
program 1 input
SEG
2
/PROG
2
LED segment 2/
program 2 input
SEG
3
/PROG
3
LED segment 3/
program 3 input
SEG
4
/PROG
4
LED segment 4/
program 4 input
SEG
5
/PROG
5
LED segment 5/
program 5 input
DONE
Charge complete
input
LCOM
SEG1/PROG1
SEG2/PROG2
SEG3/PROG3
SEG4/PROG4
SEG5/PROG5
DONE
VSS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
REF
NC
HDQ
RBI
SB
DISP
SR
16-Pin Narrow SOIC
PN20140H..eps
SLUS030鈥揓UNE 1999
1

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