BQ34210-Q1 Datasheet, PDF (14/19 Pages) Texas Instruments – Automotive 1-Series Cell System-Side CEDV Fuel Gauge for Rarely Discharged Batteries

bq34210-Q1
SLUSCG1 – AUGUST 2017
www.ti.com
8.2.6 Temperature Sense
The TS pin is used to measure the system temperature.
If the battery pack thermistor is not connected to the TS pin, the TS pin should be pulled down to VSS with a 10-
kΩ resistor. The TS pin must not be shorted directly any other pin.
8.2.7 Application Curves
14
12
10
8
6
4
2
0
-2
-50 -25
0 25 50 75 100 125 150
Actual Temperature (qC)
D003
REGIN = 3.7 V
15
1A
-1 A
10
5
0
-5
-10
-15
-50 -25
0 25 50 75 100 125 150
Actual Temperature (qC)
D004
Figure 6. Voltage Error vs Actual Temperature
Figure 7. Current Measurement Error vs Actual
Temperature
9 Power Supply Recommendation
9.1 Power Supply Decoupling
The battery connection on the REGIN pin is used for two purposes:
• To supply power to the fuel gauge and
• To provide an input for voltage measurement of the battery.
A capacitor of value of at least 1 µF should be connected between REGIN and VSS. Place the capacitor close to
the fuel gauge and have short traces to the REGIN pin and VSS.
The fuel gauge has an integrated LDO with an output on the REG18 pin of approximately 1.8 V. A capacitor of
value at least 2.2 µF should be connected between the REG18 pin and VSS. Place the capacitor close to the
fuel gauge and have short traces to both the REG18 pin and VSS. This regulator must not be used to provide
power for other devices in the system.
14
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