bq2085-V1P3
SLUS598 − FEBRUARY 2004
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DESCRIPTION (CONTINUED)
The bq2085−V1P3 uses an integrating converter with
continuous sampling for the measurement of battery
charge and discharge currents. Optimized for coulomb
counting in portable applications, the self-calibrating
integrating converter has a resolution better than 3-nVh
and an offset measurement error of less than 1-µV
(typical). For voltage and temperature reporting, the
bq2085−V1P3 uses a 16-bit A-to-D converter. In
conjunction with the bq29311, the onboard ADC also
monitors individual cell voltages in a battery pack and
allows the bq2085−V1P3 to generate the control signals
necessary to implement the cell balancing and the
required safety protection for Li-ion and Li-polymer battery
chemistries.
The bq2085−V1P3 supports the smart battery data
(SBData) commands and charge-control functions. It
communicates data using the System Management Bus
(SMBus) 2-wire protocol. The data available include the
battery’s remaining capacity, temperature, voltage,
current, and remaining run-time predictions. The
bq2085−V1P3 provides LED drivers and a push-button
input to depict remaining battery capacity from full to empty
in 20%, 25%, or 33% increments with a 3-, 4-, or
5-segment display.
The bq2085−V1P3 contains 512 bytes of internal data
flash memory, which store configuration information. The
information includes nominal capacity and voltage,
self-discharge rate, rate compensation factors, and other
programmable cell-modeling factors used to accurately
adjust remaining capacity for use-conditions based on
time, rate, and temperature. The bq2085−V1P3 also
automatically calibrates or learns the true battery capacity
in the course of a discharge cycle from programmable near
full to near empty levels.
The bq29311 AFE protection IC provides power to the
bq2085−V1P3 from a 3 or 4 series Li-ion cell stack,
eliminating the need for an external regulator circuit.
TSSOP PACKAGE
(TOP VIEW)
VIN
TS
OC
N/C
N/C
SCLK
N/C
VDDD
RBI
SDATA
VSSD
SAFE
N/C
N/C
SMBC
SMBD
DISP
EVENT
VSSD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
VSSD
N/C
N/C
CLKOUT
VSSA
ROSC
FILT
VDDA
VSSA
VSSA
SR1
SR2
MRST
N/C
LED1
LED2
LED3
LED4
LED5
NC − No internal connection
AVAILABLE OPTIONS
TA
−20°C to 85°C
PACKAGE
38-PIN TSSOP
(DBT)
(1)
bq2085−V1P3DBT
(1) The bq2085−V1P3 is available taped and reeled. Add an R suffix to
the device type (e.g., bq2085−V1P3DBTR) to order tape and reel
version.
2
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