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3.4INTERNALTEMPERATURESENSORCHARACTERISTICS
3.5HIGHFREQUENCYOSCILLATOR
3.6LOWFREQUENCYOSCILLATOR
3.7INTEGRATINGADC(COULOMBCOUNTER)CHARACTERISTICS
3.8ADC(TEMPERATUREANDCELLMEASUREMENT)CHARACTERISTICS
bq27500
bq27501
System-SideImpedanceTrack™FuelGauge
SLUS785–SEPTEMBER2007
T
A
=–40°Cto85°C,2.4V<V
CC
<2.6V;TypicalValuesatT
A
=25°CandV
CC
=2.5V(unlessotherwisenoted)
PARAMETERTESTCONDITIONSMINTYPMAXUNIT
G
TEMP
Temperaturesensorvoltagegain–2.0mV/°C
T
A
=–40°Cto85°C,2.4V<V
CC
<2.6V;TypicalValuesatT
A
=25°CandV
CC
=2.5V(unlessotherwisenoted)
PARAMETERTESTCONDITIONSMINTYPMAXUNIT
f
OSC
Operatingfrequency2.097MHz
T
A
=0°Cto60°C–2.0%0.38%2.0%
f
EIO
Frequencyerror
(1)(2)
T
A
=–20°Cto70°C–3.0%0.38%3.0%
T
A
=–40°Cto85°C–4.5%0.38%4.5%
t
SXO
Start-uptime
(3)
2.55ms
(1)Thefrequencyerrorismeasuredfrom2.097MHz.
(2)ThefrequencydriftisincludedandmeasuredfromthetrimmedfrequencyatV
CC
=2.5V,T
A
=25°C.
(3)Thestartuptimeisdefinedasthetimeittakesfortheoscillatoroutputfrequencytobe±3%.
T
A
=–40°Cto85°C,2.4V<V
CC
<2.6V;TypicalValuesatT
A
=25°CandV
CC
=2.5V(unlessotherwisenoted)
PARAMETERTESTCONDITIONSMINTYPMAXUNIT
f
LOSC
Operatingfrequency32.768kHz
T
A
=0°Cto60°C–1.5%0.25%1.5%
f
LEIO
Frequencyerror
(1)(2)
T
A
=–20°Cto70°C–2.5%0.25%2.5%
T
A
=–40°Cto85°C–4.0%0.25%4.0%
t
LSXO
Start-uptime
(3)
500μs
(1)ThefrequencydriftisincludedandmeasuredfromthetrimmedfrequencyatV
CC
=2.5V,T
A
=25°C.
(2)Thefrequencyerrorismeasuredfrom32.768kHz.
(3)Thestartuptimeisdefinedasthetimeittakesfortheoscillatoroutputfrequencytobe±3%.
T
A
=–40°Cto85°C,2.4V<V
CC
<2.6V;TypicalValuesatT
A
=25°CandV
CC
=2.5V(unlessotherwisenoted)
PARAMETERTESTCONDITIONSMINTYPMAXUNIT
V
SR_IN
Inputvoltagerange,V
(SRN)
andV
(SRP)
V
SR
=V
(SRN)
–V
(SRP)
–0.1250.125V
t
SR_CONV
ConversiontimeSingleconversion1s
Resolution1415bits
Beforecalibration1mV
V
SR_OS
Inputoffset
Aftercalibration10μV
INLIntegralnonlinearityerror±0.007±0.034%FSR
Z
SR_IN
Effectiveinputresistance
(1)
2.5MΩ
I
SR_LKG
Inputleakagecurrent
(1)
0.3μA
(1)Specifiedbydesign.Nottestedinproduction.
T
A
=–40°Cto85°C,2.4V<V
CC
<2.6V;TypicalValuesatT
A
=25°CandV
CC
=2.5V(unlessotherwisenoted)
PARAMETERTESTCONDITIONSMINTYPMAXUNIT
V
ADC_IN
Inputvoltagerange–0.21V
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