BQ27500 Datasheet, PDF (5/39 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge

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bq27500
bq27501
System-Side Impedance Track™ Fuel Gauge
SLUS785 – SEPTEMBER 2007
3.4 INTERNAL TEMPERATURE SENSOR CHARACTERISTICS
T_A = –40°C to 85°C, 2.4 V < V_CC < 2.6 V; Typical Values at T_A = 25°C and V_CC = 2.5 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP MAX
G_TEMP
Temperature sensor voltage gain
–2.0
UNIT
mV/°C
3.5 HIGH FREQUENCY OSCILLATOR
T_A = –40°C to 85°C, 2.4 V < V_CC < 2.6 V; Typical Values at T_A = 25°C and V_CC = 2.5 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP MAX
f_OSC
f_EIO
t_SXO
Operating frequency
Frequency error ^{(1) (2)}
Start-up time⁽³⁾
T_A = 0°C to 60°C
T_A = –20°C to 70°C
T_A = –40°C to 85°C
2.097
–2.0% 0.38%
–3.0% 0.38%
–4.5% 0.38%
2.5
2.0%
3.0%
4.5%
5
(1) The frequency error is measured from 2.097 MHz.
(2) The frequency drift is included and measured from the trimmed frequency at V_CC = 2.5V, T_A = 25°C.
(3) The startup time is defined as the time it takes for the oscillator output frequency to be ±3%.
UNIT
MHz
ms
3.6 LOW FREQUENCY OSCILLATOR
T_A = –40°C to 85°C, 2.4 V < V_CC < 2.6 V; Typical Values at T_A = 25°C and V_CC = 2.5 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
f_LOSC
f_LEIO
t_LSXO
Operating frequency
Frequency error ^{(1) (2)}
Start-up time⁽³⁾
T_A = 0°C to 60°C
T_A = –20°C to 70°C
T_A = –40°C to 85°C
–1.5%
–2.5%
–4.0%
32.768
0.25%
0.25%
0.25%
1.5%
2.5%
4.0%
500
(1) The frequency drift is included and measured from the trimmed frequency at V_CC = 2.5V, T_A = 25°C.
(2) The frequency error is measured from 32.768 kHz.
(3) The startup time is defined as the time it takes for the oscillator output frequency to be ±3%.
UNIT
kHz
μs
3.7 INTEGRATING ADC (COULOMB COUNTER) CHARACTERISTICS
T_A = –40°C to 85°C, 2.4 V < V_CC < 2.6 V; Typical Values at T_A = 25°C and V_CC = 2.5 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP MAX
V_{SR_IN}
t_{SR_CONV}
Input voltage range, V_(SRN) and V_(SRP)
Conversion time
Resolution
V_SR = V_(SRN) – V_(SRP)
Single conversion
–0.125
14
0.125
1
15
V_{SR_OS}
Input offset
Before calibration
1
After calibration
10
INL
Z_{SR_IN}
I_{SR_LKG}
Integral nonlinearity error
Effective input resistance⁽¹⁾
Input leakage current⁽¹⁾
±0.007 ±0.034
2.5
0.3
(1) Specified by design. Not tested in production.
UNIT
V
s
bits
mV
μV
% FSR
MΩ
μA
3.8 ADC (TEMPERATURE AND CELL MEASUREMENT) CHARACTERISTICS
T_A = –40°C to 85°C, 2.4 V < V_CC < 2.6 V; Typical Values at T_A = 25°C and V_CC = 2.5 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP MAX
V_{ADC_IN}
Input voltage range
–0.2
1
UNIT
V
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ELECTRICAL SPECIFICATIONS
5