BQ20Z655 Datasheet, PDF (10/23 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE AND PROTECTION ENABLED WITH IMPEDANCE TRACK

bq20z655
SLUSAH8 – APRIL 2011
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ELECTRICAL CHARACTERISTICS (continued)
Over operating free-air temperature range (unless otherwise noted), T_A = –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 T_A = 25°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
Full-scale error⁽⁵⁾
±0.1%
±0.7%
Full-scale error drift
50
PPM/°C
Effective input resistance⁽⁶⁾
8
MΩ
COULOMB COUNTER
Input voltage range
–0.20
0.20
V
Conversion time
Single conversion
250
ms
Effective resolution
Single conversion
15
bits
Integral nonlinearity
Offset error ⁽⁷⁾
Offset error drift
–0.1 V to 0.20 V
–0.20 V to –0.1 V
T_A = 25°C to 85°C
±0.007
±0.007
10
0.4
±0.034
0.7
%FSR
µV
µV/°C
Full-scale error^{(8) (9)}
±0.35%
Full-scale error drift
Effective input resistance⁽¹⁰⁾
INTERNAL TEMPERATURE SENSOR
T_A = 25°C to 85°C
150
2.5
PPM/°C
MΩ
V_(TEMP)
Temperature sensor
voltage ⁽¹¹⁾
–2.0
mV/°C
VOLTAGE REFERENCE
Output voltage
1.215
1.225
1.230
V
Output voltage drift
65
PPM/°C
HIGH FREQUENCY OSCILLATOR
f_(OSC)
Operating frequency
f_(EIO)
Frequency error ^{(12) (13)}
t_(SXO)
Start-up time⁽¹⁴⁾
LOW FREQUENCY OSCILLATOR
T_A = 20°C to 70°C
4.194
MHz
–3%
0.25%
3%
–2%
0.25%
2%
2.5
5
ms
f_(LOSC)
f_(LEIO)
t_(LSXO)
Operating frequency
Frequency error^{(13) (15)}
Start-up time⁽¹⁴⁾
T_A = 20°C to 70°C
32.768
kHz
–2.5%
0.25%
2.5%
–1.5%
0.25%
1.5%
500
µs
(5) Uncalibrated performance. This gain error can be eliminated with external calibration.
(6) The A/D input is a switched-capacitor input. Since the input is switched, the effective input resistance is a measure of the average
resistance.
(7) Post-calibration performance
(8) Reference voltage for the coulomb counter is typically V_ref/3.969 at V_(REG25) = 2.5 V, T_A = 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) = 2.5 V, T_A = 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.
10
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