Datasheet

bq20z655-R1
SLUSAN9 –AUGUST 2011 www.ti.com
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
–0.1 V to 0.20 V ±0.007 ±0.034
Integral nonlinearity %FSR
–0.20 V to –0.1 V ±0.007
Offset error
(7)
T
A
= 25°C to 85°C 10 µV
Offset error drift 0.4 0.7 µV/°C
Full-scale error
(8) (9)
±0.35%
Full-scale error drift 150 PPM/°C
Effective input resistance
(10)
T
A
= 25°C to 85°C 2.5 MΩ
INTERNAL TEMPERATURE SENSOR
Temperature sensor
V
(TEMP)
–2.0 mV/°C
voltage
(11)
VOLTAGE REFERENCE
Output voltage 1.215 1.225 1.230 V
Output voltage drift 65 PPM/°C
HIGH FREQUENCY OSCILLATOR
f
(OSC)
Operating frequency 4.194 MHz
–3% 0.25% 3%
f
(EIO)
Frequency error
(12) (13)
T
A
= 20°C to 70°C –2% 0.25% 2%
t
(SXO)
Start-up time
(14)
2.5 5 ms
LOW FREQUENCY OSCILLATOR
f
(LOSC)
Operating frequency 32.768 kHz
–2.5% 0.25% 2.5%
f
(LEIO)
Frequency error
(13) (15)
T
A
= 20°C to 70°C –1.5% 0.25% 1.5%
t
(LSXO)
Start-up time
(14)
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.
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