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Texas Instruments bq27500 Manual do Utilizador Página 5

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3.4 INTERNAL TEMPERATURE SENSOR CHARACTERISTICS
3.5 HIGH FREQUENCY OSCILLATOR
3.6 LOW FREQUENCY OSCILLATOR
3.7 INTEGRATING ADC (COULOMB COUNTER) CHARACTERISTICS
3.8 ADC (TEMPERATURE AND CELL MEASUREMENT) CHARACTERISTICS
bq27500
bq27501
System-Side Impedance Track™ Fuel Gauge
SLUS785 – SEPTEMBER 2007
T
A
= –40 ° C to 85 ° C, 2.4 V < V
CC
< 2.6 V; Typical Values at T
A
= 25 ° C and V
CC
= 2.5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
G
TEMP
Temperature sensor voltage gain –2.0 mV/ ° C
T
A
= –40 ° C to 85 ° C, 2.4 V < V
CC
< 2.6 V; Typical Values at T
A
= 25 ° C and V
CC
= 2.5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
f
OSC
Operating frequency 2.097 MHz
T
A
= 0 ° C to 60 ° C –2.0% 0.38% 2.0%
f
EIO
Frequency error
(1) (2)
T
A
= –20 ° C to 70 ° C –3.0% 0.38% 3.0%
T
A
= –40 ° C to 85 ° C –4.5% 0.38% 4.5%
t
SXO
Start-up time
(3)
2.5 5 ms
(1) The frequency error is measured from 2.097 MHz.
(2) The frequency drift is included and measured from the trimmed frequency at V
CC
= 2.5V, T
A
= 25 ° C.
(3) The startup time is defined as the time it takes for the oscillator output frequency to be ± 3%.
T
A
= –40 ° C to 85 ° C, 2.4 V < V
CC
< 2.6 V; Typical Values at T
A
= 25 ° C and V
CC
= 2.5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
f
LOSC
Operating frequency 32.768 kHz
T
A
= 0 ° C to 60 ° C –1.5% 0.25% 1.5%
f
LEIO
Frequency error
(1) (2)
T
A
= –20 ° C to 70 ° C –2.5% 0.25% 2.5%
T
A
= –40 ° C to 85 ° C –4.0% 0.25% 4.0%
t
LSXO
Start-up time
(3)
500 μ s
(1) The frequency drift is included and measured from the trimmed frequency at V
CC
= 2.5V, T
A
= 25 ° C.
(2) The frequency error is measured from 32.768 kHz.
(3) The startup time is defined as the time it takes for the oscillator output frequency to be ± 3%.
T
A
= –40 ° C to 85 ° C, 2.4 V < V
CC
< 2.6 V; Typical Values at T
A
= 25 ° C and V
CC
= 2.5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
SR_IN
Input voltage range, V
(SRN)
and V
(SRP)
V
SR
= V
(SRN)
– V
(SRP)
–0.125 0.125 V
t
SR_CONV
Conversion time Single conversion 1 s
Resolution 14 15 bits
Before calibration 1 mV
V
SR_OS
Input offset
After calibration 10 μ V
INL Integral nonlinearity error ± 0.007 ± 0.034 % FSR
Z
SR_IN
Effective input resistance
(1)
2.5 M Ω
I
SR_LKG
Input leakage current
(1)
0.3 μ A
(1) Specified by design. Not tested in production.
T
A
= –40 ° C to 85 ° C, 2.4 V < V
CC
< 2.6 V; Typical Values at T
A
= 25 ° C and V
CC
= 2.5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
ADC_IN
Input voltage range –0.2 1 V
Submit Documentation Feedback ELECTRICAL SPECIFICATIONS 5
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