| 摘要 |
<p>PURPOSE:To enable automatic adjustment without mounting an ADC by automatically calculating an adjusted voltage while using a DAC for voltage adjustment and an external ADC when the external ADC for monitoring the adjusted result is connected, and storing the adjusted voltage in a non-volatile memory. CONSTITUTION:A CPU 6 monitors an external ADC connection confirming signal line 20. When an external ADC 19 is connected, namely, when the signal of the signal line 20 is LOW, the CPU 6 executes an adjusting operation. At such a time, the adjusted voltage is calculated by the CPU 6 while using a DAC 7 for voltage adjustment and the external ADC 19 and stored on a non- volatile memory 9. Namely, the CPU 6 increases the quantity of light little by little while using the DAC 7. At that time, a sensor output is monitored by the external ADC, and an intermediate value between a data instructed to the DAC 7 in the case of entering an expected range and data in the case of leaving the range is stored in the non-volatile memory 9. Thus, since the automatic adjustment is enabled without mounting the ADC, the cost of the device can be reduced and the design of mounting can be simplified by eliminating a volume.</p> |
