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BQ20Z80DBTR-V102 Datasheet(PDF) 9 Page - Texas Instruments

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Part # BQ20Z80DBTR-V102
Description  SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK-TM TECHNOLOGY FOR USE WITH THE bq29312A
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

BQ20Z80DBTR-V102 Datasheet(HTML) 9 Page - Texas Instruments

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LED Display
LifeTime Data Logging Features
Authentication
Power Modes
CONFIGURATION
Oscillator Function
bq20z80-V102
SLUS681A – NOVEMBER 2005 – REVISED MARCH 2006
FEATURE SET (continued)
The bq20z80 can drive 3-, 4-, or 5- segment LED display for remaining capacity indication.
The bq20z80 offers a lifetime data logging array, where all important measurements are stored for warranty and
analysis purposes. The data monitored includes:
Lifetime maximum temperature
Lifetime minimum temperature
Lifetime maximum battery cell voltage
Lifetime minimum battery cell voltage
Lifetime maximum battery pack voltage
Lifetime minimum battery pack voltage
Lifetime maximum charge current
Lifetime maximum discharge current
Lifetime maximum charge power
Lifetime maximum discharge power
Lifetime maximum average discharge current
Lifetime maximum average discharge power
Lifetime average temperature
The bq20z80 supports authentication by the host using SHA-1.
The bq20z80 supports 3 different power modes to reduce power consumption:
In Normal Mode, the bq20z80 performs measurements, calculations, protection decicions, data update in 1
second intervals. Between these intervals, the bq20z80 is in a reduced power stage.
In Sleep Mode, the bq20z80 performs measurements, calculations, protection decicions, data update in
adjustable time intervals. Between these intervals, the bq20z80 is in a reduced power stage.
In Shutdown Mode the bq20z80 is completety disabled.
The oscillator of the bq20z80 can be set up for internal or external operation. On power up, the bq20z80
automatically attempts to start the internal oscillator. If a 100-k
Ω resistor is not connected to ROSC (pin 33), then
it attempts to start the oscillator using an external 32.768-kHz crystal.
NOTE:
Install either the 100-k
Ω ROSC resistor or the 12-pF, 32.768-kHz crystal. Do not
install both.
The performance of the internal oscillator depends on the tolerance of the 100-k
Ω resistor between RSOC (pin
33) and VSSA (pin 34). Choose a resistor with a tolerance of
±0.1%, and 50-ppm or better temperature drift.
Place this resistor as close as possible to the bq20z80. If a 12-pF crystal is used, place it as close as possible to
the XCK1 (pin 34) and XCK2 (pin 33) pins. If not properly implemented, the PCB layout in this area can degrade
oscillator performance.
9
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