This 4 digits LCD SP521PR based digital thermometer, it is possible to measure from -40 to +150 degree celsius. It uses S8100 or 1S1588 as thermal sensor. The power consumption is very small and it is possible to operate about 3 months continuously from a 9-V cell.
This is the TN (Twisted Nematic)-type liquid crystal display. It is possible to 4 digits display but the display of the maximum figure is only "1". It isn't possible to work continuously in the direct current. However, when applying the about 5-V DC voltage between the backplane (common) and the terminal, the color of the segment which corresponds can be temporarily changed to the black. With this, the correspondence of the terminal and the display segment can be confirmed.
LCD 4 Digits SP521PR picThe maximum applied voltage : 10 V
The operating temperature : -10 to 55°C
The storage temperature : -20 to 60°C
When using the 5-V power supply, the resistor as much as 10K-ohm must be put in series to prevent from big electric current's flowing in case of the short circuit. The specification of SP521PR to be using this time is as follows.
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