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AN2390 데이터시트(PDF) 13 Page - STMicroelectronics

부품명 AN2390
상세설명  A flexible universal battery charger
PDF  42 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2390 데이터시트(HTML) 13 Page - STMicroelectronics

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AN2390
Evaluation board implementation
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2.2.4
Temperature sensing
The circuit for the temperature measurement is given in Figure 7.
Figure 7.
Temperature measurement circuit
For Li-ion, there is an inbuilt NTC so there is no need for an external thermistor but for NiMH,
an external NTC is connected to the negative terminal of the battery.
The same measurement technique is used for both cases. Here the ST7 ADC channel AIN8
is used for the Li-ion temperature measurement and ST7 ADC channel AIN14 is used for
NiMH.
For this demo application, we do not need to monitor the temperature very extensively. We
only need to detect extreme hot or cold conditions. For this reason, rather than using a look-
up table to calculate the temperature, certain predefined parameters are used and these
parameters are compared with the temperature reading in terms of NTC resistance which
simplifies the calculation.
VDD
Battery
RS
ST7 analog input
(AIN8 or AIN14)



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