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AN2390 数据表(PDF) 13 Page - STMicroelectronics |
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AN2390 数据表(HTML) 13 Page - STMicroelectronics |
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13 / 42 page  AN2390 Evaluation board implementation 13/42 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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