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BQ20Z45 Datasheet, PDF (8/20 Pages) Texas Instruments – SBS 1.1-Compliant Gas Gauge and Protection Enabled With Impedance Track™
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bq20z45
SLUS800 – MARCH 2009 .................................................................................................................................................................................................. www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
over operating free-air temperature range (unless otherwise noted), TA = –40°C to 85°C, V(REG25) = 2.41 V to 2.59 V,
V(BAT) = 14 V, C(REG25) = 1 µF, C(REG33) = 2.2 µF; typical values at TA = 25°C (unless otherwise noted)
PARAMETER
Offset error (7)
Offset error drift
Full-scale error(8)(9)
Full-scale error drift
Effective input resistance(10)
INTERNAL TEMPERATURE SENSOR
V(TEMP)
Temperature sensor voltage(11)
VOLTAGE REFERENCE
Output voltage
Output voltage drift
HIGH FREQUENCY OSCILLATOR
f(OSC)
Operating frequency
f(EIO)
Frequency error (12)(13)
t(SXO)
Start-up time(14)
LOW FREQUENCY OSCILLATOR
f(LOSC)
Operating frequency
f(LEIO)
Frequency error(13)(15)
t(LSXO)
Start-up time(14)
TEST CONDITIONS
TA = 25°C to 85°C
TA = 25°C to 85°C
TA = 20°C to 70°C
TA = 20°C to 70°C
MIN
2.5
1.215
–3%
–2%
–2.5%
–1.5%
TYP
10
0.4
±0.35%
150
-2.0
1.225
65
4.194
0.25%
0.25%
2.5
32.768
0.25%
0.25%
MAX
0.7
UNIT
µV
µV/°C
PPM/
°C
MΩ
mV/°C
1.230
V
PPM/
°C
MHz
3%
2%
5 ms
kHz
2.5%
1.5%
500 µs
(7) Post-calibration performance
(8) Reference voltage for the coulomb counter is typically Vref/3.969 at V(REG25) = 2.5 V, TA = 25°C.
(9) Uncalibrated performance. This gain error can be eliminated with external calibration.
(10) The CC input is a switched capacitor input. Since the input is switched, the effective input resistance is a measure of the average
resistance.
(11) –53.7 LSB/°C
(12) The frequency error is measured from 4.194 MHz.
(13) The frequency drift is included and measured from the trimmed frequency at V(REG25) = 2.5V, TA = 25°C
(14) The startup time is defined as the time it takes for the oscillator output frequency to be ±3%
(15) The frequency error is measured from 32.768 kHz.
8
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