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BQ2050H Datasheet(PDF) 1 Page - Texas Instruments

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Part No. BQ2050H
Description  Low-Cost Lithium Ion Power Gauge IC
Download  25 Pages
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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BQ2050H Datasheet(HTML) 1 Page - Texas Instruments

 
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Features
➤ Accurate measurement of avail-
able capacity in Lithium Ion bat-
teries
➤ Provides a low-cost battery man-
agement solution for pack
integration
- Complete circuit can fit in as
little as 1
2 square inch of PCB
- Low operating current (120µA
typical)
- Less than 100nA of data
retention current
➤ High-speed (5kb) single-wire
communication interface (HDQ
bus) for critical battery
parameters
➤ Monitors and controls charge FET
in Li-Ion pack protection circuit
➤ Direct drive of remaining capacity
LEDs
➤ Measurements automatically
compensated for rate and
temperature
➤ 16-pin narrow SOIC
General Description
The bq2050H Lithium Ion Power
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. These seg-
ments are used to graphically indi-
cate
available
capacity.
The
bq2050H also supports a simple
single-line bidirectional serial link
to an external processor (common
ground). The 5kb HDQ bus interface
reduces communications overhead
in the external microcontroller.
Internal registers include available
capacity, temperature, scaled avail-
able energy, battery ID, battery
status, and Li-Ion charge FET
status. The external processor may
also overwrite some of the bq2050H
power gauge data registers.
The bq2050H 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
bq2050H
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
CFC
Charge FET control
output
1
PN2050H1.eps
16-Pin Narrow SOIC
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
REF
PSTAT
HDQ
RBI
SB
DISP
SR
LCOM
SEG1/PROG1
SEG2/PROG2
SEG3/PROG3
SEG4/PROG4
SEG5/PROG5
CFC
VSS
VSS
System ground
SR
Sense resistor input
DISP
Display control input
SB
Battery sense input
RBI
Register backup input
HDQ
Serial communications
input/output
PSTAT
Protector status input
REF
Voltage reference output
VCC
Supply voltage
Pin Connections
SLUS150–MAY 1999 D
Low-Cost Lithium Ion Power Gauge™ IC
Pin Names


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