| 摘要 |
PURPOSE:To reduce the cost of necessary facilities by providing oscillation circuits OSCT and OSCH which generate AC signals with periods corresponding to measured temperature and humidity and a control part CNT which places those circuits in operation successively. CONSTITUTION:When a polling signal (a) is received from a host device at a constant period, the CNT raises a control signal SCT(b) and a pulse signal (d) to 'H' firstly, so the OSCT starts oscillating to supply a pulse signal (e) having the period corresponding to the measured temperature as an AC signal to a frequency divider DV through an OR gate dv, and the frequency divider DV also generates its frequency division output (f) of 'H' to send out a clock pulse (g) through an Nand gate G1. Then, the pulse is counted and the frequency divider DV when counting up to a specific value generates its frequency division output (f) of 'L' to inhibit the pulses (g) from being passed; and the CNT lowers the signals (b) and (d) to 'L' to turn off the OSCT, and the frequency divider DV is reset. Similarly, the OSCH is put in operation next. Thus, the measurement signals corresponding to the measured temperature and humidity are obtained. |
