Application Note

13

<Revision 1.0>

<2017-05-22>

Eval-M1-CM610N3

iMOTION™ Modular Application Design Kit

Schematics and Layout

5.6

Thermistor Output

This board provides Thermistor/NTC output on pin 15 of the 20 pin connector J2. Temperatures can be

calculated by resistor measurement. The thermistor characteristics for CIPOS™ mini IPM with build in NTC are

listed as summarized in Table 6.

Table 6

CIPOS™ Internal NTC – Thermistor Characteristics

Description

Condition

Symbol

Value

Unit

min

typ

max

Resistor

79.638

85.000

90.362

kΩ

Resistor

28.400

29.972

31.545

kΩ

Resistor

19.517

20.515

21.514

kΩ

Resistor

13.670

14.315

14.960

kΩ

Resistor

9.745

10.169

10.593

kΩ

Resistor

7.062

7.345

7.628

kΩ

Resistor

5.199

5.388

5.576

kΩ

Resistor

3.856

4.009

4.163

kΩ

Resistor

2.900

3.024

3.149

kΩ

Resistor

2.527

2.639

2.751

kΩ

B-constant of NTC

B(25/100)

4092

K

The VFO pin of CIPOS™-Modules provides direct access to the NTC, which is referenced to VSS. An external pull-

up resistor connected to +3.3V ensures that the resulting voltage can be directly connected to the

microcontroller.

Figure 9 depicts the CIPOS™ internal circuit at pin VFO. An external pull-up resistor is required to bias the NTC.

Figure 9

Internal circuit at pin VFO for CIPOS™ IPM IKCM10H60GA