User guide
33 of 45
V 1.0.1
2021-01-27
REF-AIRCON-C302A-IM564 user guide
Air conditioner application reference design kits
System performance
To activate over-temperature protection (OTP), 2 setups are needed in MCEWizard as shown in Figure 28:
-
Enable over-temperature shutdown function
-
Set voltage for shutdown
Figure 28
Over-temperature protection enabled in MCEWizard
The IM564 IPM built-in NTC thermistor is 85 kOhm at 25
℃
,
and its B-constant is 4092; typical resistance and
output of the temperature-sensing voltage is listed in Table 10.
Table 10
NTC – Thermistor characteristics
Temperature
(
℃
)
Resistance
(kOhm)
Vout (mV)
50
29.972
4687
60
20.515
4556
70
14.315
4387
80
10.169
4178
90
7.345
3930
100
5.388
3646
110
4.009
3336
120
3.024
3010
125
2.639
2844
Given that the VFO pin is fault-output compatible (LOW true at IPM fault status), the temperature-sensing pull-
up resistor needs to keep the temperature detection output as far away from the low level threshold of the
digital IO as possible.
