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Function description:
<1> TC4731 is the CMOS IC for INDOOR/OUTDOOR temperature display and clock TIMER
display .
Temperature measurement range：-50  ℃ (-58  ℉)  ～ 70  ℃(158  ℉)
TIMER display range ： 1:00  ～ 12:59
<2> Use TWO sensor (103AT)：One for INDOOR and another for OUTDOOR
<3> The PAD MODE1, MODE2 are used to select MODE function
<4> Push FSW can select Power on, Power off, INDOOR display, OUTDOOR display, TIMER display.
<5> When Power on LCD FULL display 2 sec, then display the current indoor temperature, when LCD
FULL display, push FSW can not change MODE
<6> If push FSW key holding time over 4 sec, it will be Power off, then LCD can not display and
measure temperature, TIMER counter is continuous
<7> Measure period can select 1 sec, 2 sec, 5 sec, 10 sec by MCY1, MCY2 option pad
<8> Temperature display
If temperature ≧ 70 ℃ (158 ℉), then LCD display H  ℃( ℉)，
If temperature ＜-50 ℃ (-58 ℉), then LCD display L  ℃( ℉)。

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