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SLUS556 – FEBRUARY 2003
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FEATURES
APPLICATIONS
D
Reports Accurate Time-to-Empty in Li-Ion
and Li-Pol Cells, No System Processor
Calculations Needed
D
D
D
D
D
D
PDAs
Smart Phones
MP3 Players
D
D
Reports Cell Temperature, Voltage and
Average Current
Digital Cameras
Internet Appliances
Handheld Devices
High-Accuracy Coulometric Charge and
Discharge Current Integration with
Automatic Offset Cancellation
DESCRIPTION
D
D
D
Requires No Offset Calibration
Programmable Input/Output Port
The bqJUNIOR series are highly accurate
standalone single-cell Li-Ion and Li-Pol battery
capacity monitoring and reporting devices
targeted at space limited portable applications.
The device monitors a voltage drop across a small
current sense resistor connected in series with the
battery to determine charge and discharge activity
of the battery. Compensations for battery
temperature, self–discharge, and rate of
discharge are applied to the charge counter to
provide available time-to-empty and time-to-full
information across a wide range of operating
conditions. Battery capacity is automatically
recalibrated, or learned, in the course of a
discharge cycle from full to empty. Internal
registers include available time-to-empty, cell
temperature and voltage, average current, and
other status and control registers.
Internal Time-Base Eliminates External
Crystal Oscillator
D
Four Automatic Low-Power Operating Modes
– Active: < 100 µA
– Sleep: < 5 µA
– Ship: < 2 µA
– Hibernate: < 500 nA
D
Small 8-Pin TSSOP Package
TYPICAL APPLICATION
PACK+
UDG–03038
Li-Ion
or
Li-Pol
+
C4
0.1 µF
bqJUNIOR
1
2
3
4
RBI GPIO
VCC SRP
VSS SRN
HDQ BAT
8
7
6
5
R2
100 kΩ
The bqJUNIOR can operate directly from
single-cell Li-Ion and Li-Pol batteries and
communicates to the system over a simple
one-wire bi-directional serial interface. The
C3
0.1 µF
C1
0.1 µF
R1
0.02Ω
HDQ
5-kbits/s
HDQ
bus
interfaces
reduces
R3
100 kΩ
communications overhead in the external
microcontroller.
C2
0.1 µF
Protection
Controller
PACK–
Battery Pack
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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ꢪꢧ ꢨ ꢞ ꢮꢟ ꢩꢬ ꢤ ꢨ ꢧ ꢡꢠ ꢪꢧ ꢭ ꢧ ꢯꢡ ꢩꢣꢧ ꢟꢥꢰ ꢎ ꢬꢤ ꢢꢤ ꢦꢥ ꢧꢢ ꢞꢨ ꢥꢞ ꢦ ꢪꢤ ꢥꢤ ꢤꢟ ꢪ ꢡꢥ ꢬꢧꢢ
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Copyright 2003, Texas Instruments Incorporated
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ꢦ ꢬꢤ ꢟ ꢮꢧ ꢡꢢ ꢪꢞ ꢨ ꢦ ꢡꢟ ꢥꢞ ꢟꢫꢧ ꢥ ꢬꢧ ꢨ ꢧ ꢩꢢ ꢡꢪ ꢫꢦꢥ ꢨ ꢲ ꢞꢥꢬ ꢡꢫꢥ ꢟꢡꢥ ꢞꢦꢧ ꢰ
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1
www.ti.com