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| BQ27421-G1 Datasheet, PDF (7/20 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge With Integrated Sense Resistor | |||
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bq27421-G1
www.ti.com
SLUSB85 â MAY 2013
ADC (TEMPERATURE AND CELL MEASUREMENT) CHARACTERISTICS
TA = â40°C to 85°C; typical values at TA = 30°C and VREGIN = 3.6 V (unless otherwise noted) (Force Note1)(1)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
VIN(BAT)
BAT pin voltage measurement Voltage divider enabled.
range.
2.45
4.5
tADC_CONV
Conversion time
125
Effective Resolution
15
(1) Specified by design. Not tested in production.
UNIT
V
ms
bits
INTEGRATING ADC (COULOMB COUNTER) CHARACTERISTICS
TA = â40°C to 85°C; typical values at TA = 30°C and VREGIN = 3.6 V (unless otherwise noted)(Force Note1)(1)
PARAMETER
TEST CONDITIONS
MIN
TYP
VSR
Input voltage range from BAT to
SRX pins
BAT ± 25
tSR_CONV
Conversion time
Single conversion
1
Effective Resolution
Single conversion
16
MAX
(1) Assured by design. Not tested in production.
UNIT
mV
s
bits
INTEGRATED SENSE RESISTOR CHARACTERISTICS
TA = â40°C to 85°C; typical values at TA = 30°C and VREGIN = 3.6 V (unless otherwise noted) (Force Note1)(1)
PARAMETER
TEST CONDITIONS
MIN
TYP
SRXRES (2)
Resistance of Integrated Sense TA = 30°C
7
Resistor from SRX to VSS.
ISRX (1)
Recommended Sense Resistor Long term RMS, average device
input current.
utilization.
MAX
2000
Peak RMS current, 10% device
utilization. (3)
2500
Peak pulsed current, 250mS max,
1% device utilization.(3)
3500
(1) Specified by design. Not tested in production.
(2) Firmware compensation applied for temperature coefficient of resistor.
(3) Device utilization is the long term usage profile at a specific condition compared to the average condition.
UNIT
mâ¦
mA
mA
mA
Copyright © 2013, Texas Instruments Incorporated
Product Folder Links: bq27421-G1
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