Texas Instruments System-Side Impedance Track(TM) Fuel Gauge bq27500 Manual De Usuario
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3.4
INTERNAL TEMPERATURE SENSOR CHARACTERISTICS
3.5
HIGH FREQUENCY OSCILLATOR
3.6
LOW FREQUENCY OSCILLATOR
3.7
INTEGRATING ADC (COULOMB COUNTER) CHARACTERISTICS
3.8
ADC (TEMPERATURE AND CELL MEASUREMENT) CHARACTERISTICS
bq27500
bq27501
bq27501
System-Side Impedance Track™ Fuel Gauge
SLUS785 – SEPTEMBER 2007
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
UNIT
G
TEMP
Temperature sensor voltage gain
–2.0
mV/
°
C
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
UNIT
f
OSC
Operating frequency
2.097
MHz
T
A
= 0
°
C to 60
°
C
–2.0% 0.38%
2.0%
f
EIO
Frequency error
(1) (2)
T
A
= –20
°
C to 70
°
C
–3.0% 0.38%
3.0%
T
A
= –40
°
C to 85
°
C
–4.5% 0.38%
4.5%
t
SXO
Start-up time
(3)
2.5
5
ms
(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%.
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
UNIT
f
LOSC
Operating frequency
32.768
kHz
T
A
= 0
°
C to 60
°
C
–1.5%
0.25%
1.5%
f
LEIO
Frequency error
(1) (2)
T
A
= –20
°
C to 70
°
C
–2.5%
0.25%
2.5%
T
A
= –40
°
C to 85
°
C
–4.0%
0.25%
4.0%
t
LSXO
Start-up time
(3)
500
μ
s
(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%.
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
UNIT
V
SR_IN
Input voltage range, V
(SRN)
and V
(SRP)
V
SR
= V
(SRN)
– V
(SRP)
–0.125
0.125
V
t
SR_CONV
Conversion time
Single conversion
1
s
Resolution
14
15
bits
Before calibration
1
mV
V
SR_OS
Input offset
After calibration
10
μ
V
INL
Integral nonlinearity error
±
0.007
±
0.034
% FSR
Z
SR_IN
Effective input resistance
(1)
2.5
M
Ω
I
SR_LKG
Input leakage current
(1)
0.3
μ
A
(1)
Specified by design. Not tested in production.
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
UNIT
V
ADC_IN
Input voltage range
–0.2
1
V
ELECTRICAL SPECIFICATIONS
5