AS3701 datasheet(30/110 Pages) AMSOSRAM

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ams Datasheet

Page 29

[v1-11] 2016-Dec-14

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AS3701 − Detailed Description – Power Management Functions

NTC ß-Correction

To keep the voltage drop over the whole temperature range

inside of the comparator threshold voltage range, a 15k (150k)

parallel resistor to the 10k (100k) NTC is needed. With the bit

ntc_beta [ChargerSupervision] 4 different

ß-values depending

on the used NTC resistor can be selected.

Figure 34:

NTC

ß Influence Over Temperature

NTC ß Influence Diagram: Shows the voltage drop over the NTC resistor depending on the temperature for 4

different ß values using RNTC=10kΩ, Rp=15kΩ and INTC=150μA.

Figure 35:

NTC Threshold Voltages

NTC Supervision: Comparator threshold voltages for different temperatures and ß using RNTC=10kΩ, Rp=15kΩ

and INTC=150μA.

Temperature

Unit

3000

3500

4000

4500

Low temperature

0°C

1.41

1.49

1.56

1.63

High temperature

45°C

0.59

0.54

0.50

0.46

60°C

0.42

0.37

0.31

0.27

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

10203040

NTC_Temperature (°C)

ß = 3000

ß = 3500

ß = 4000

ß = 4500

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