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© 2021 ROHM Co., Ltd.
No. 64UG016E Rev.001
MAY.2021
User’s Guide
BD71631QWZ-EVK-001
Where the NTC thermistor resistance at the T
_Cold
and T
_Hot
temperatures must be resolved as follows:
𝑅
𝑁𝑇𝐶_𝐶𝑜𝑙𝑑
= 𝑅𝑜 × 𝑒
𝐵(1 𝑇_𝐶𝑜𝑙𝑑
⁄
−1 𝑇𝑜
⁄
)
𝑅
𝑁𝑇𝐶_𝐻𝑜𝑡
= 𝑅𝑜 × 𝑒
𝐵(1 𝑇_𝐻𝑜𝑡
⁄
−1 𝑇𝑜
⁄
)
V
Cold
: The value of the voltage divided by the resistance at low temperature
V
Hot
: The value of the voltage divided by the resistance at hot temperature
V
NTC_Cold
: Detection voltage of NTC terminal at low temperature . 3.605 V at Ta=2 °C
V
NTC_Hot
: Detection voltage of NTC terminal at high temperature. 1.535 V at Ta=48 °C
R
NTC_Cold
: NTC thermistor resistance at cold temperature
R
NTC_Hot
: NTC thermistor resistance at hot temperature
Ro: NTC thermistor resistance at Ta 25°C
B: B constant of NTC thermistor
T
_Cold
: Low temperature
T
_Hot
: High temperature
To: 25°C
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