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
TEST CONDITIONS
TA = 25°C to 85°C
MIN
TYP
10
MAX UNIT
µV
(7)
Offset error
Offset error drift
0.4
0.7 µV/°C
Full-scale error(8)(9)
±0.35%
PPM/
°C
Full-scale error drift
150
Effective input resistance(10)
TA = 25°C to 85°C
2.5
MΩ
INTERNAL TEMPERATURE SENSOR
V(TEMP)
VOLTAGE REFERENCE
Output voltage
Temperature sensor voltage(11)
-2.0
mV/°C
1.215
1.225
65
1.230
V
PPM/
°C
Output voltage drift
HIGH FREQUENCY OSCILLATOR
f(OSC)
Operating frequency
4.194
0.25%
0.25%
2.5
MHz
–3%
–2%
3%
2%
5
(12)(13)
f(EIO)
Frequency error
Start-up time(14)
TA = 20°C to 70°C
t(SXO)
ms
LOW FREQUENCY OSCILLATOR
f(LOSC)
f(LEIO)
t(LSXO)
Operating frequency
Frequency error(13)(15)
Start-up time(14)
32.768
0.25%
0.25%
kHz
–2.5%
–1.5%
2.5%
1.5%
500
TA = 20°C to 70°C
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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