Datasheet

bq20z75-V180
SLUSA22 –DECEMBER 2009 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
=
14V, C
REG25
= 1µF, C
REG33
= 2.2µF; typical values at T
A
= 25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
REG25
–0.
V
OH
Output voltage high
(1)
SAFE, I
L
= –0.5 mA V
5
V
OL
Low-level output voltage PRES, PFIN, ALERT, I
L
= 7 mA; 0.4 V
C
I
Input capacitance 5 pF
I
(SAFE)
SAFE source currents SAFE active, SAFE = V
REG25
–0.6 V –3 mA
I
lkg(SAFE)
SAFE leakage current SAFE inactive –0.2 0.2 µA
I
lkg
Input leakage current 1 µA
ADC
(2)
V
REG25
+
Input voltage range TS1,TS2, using external V
ref
–0.2 V
0.2
Conversion time 31.5 ms
Resolution (no missing codes) 16 bits
Effective resolution 14 15 bits
Integral nonlinearity ±0.03 %FSR
(3)
Offset error
(4)
140 250 µV
Offset error drift
(4)
T
A
= 25°C to 85°C 2.5 18 μV/°C
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 2.45 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
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 4.194 MHz
(1) RC[0:7] bus
(2) Unless otherwise specified, the specification limits are valid at all measurement speed modes
(3) Full-scale reference
(4) Post-calibration performance and no I/O changes during conversion with SRN as the ground reference
(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
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