| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent influence of interactive noise generated between an analogue part and a digital part, through a power supply circuit. SOLUTION: A power source supply part has a first battery 28 and a second battery 30, corresponding to the digital circuit and the analogue circuit. A power-source-supply control part 34 has a multiplexer 70 to which the digital circuit is connected, and a multiplexer 72 to which the analogue circuit is connected. The output signals of reset ICs 60a-60d, to which the first battery 28 or the second battery 30 is connected, are changed from 'H' to 'L', when chattering is occurred in the battery. The output of latch circuits 66 and 68 is changed by the change of the output signals of the reset ICs 60a-60d, and outputted to the multiplexers 70 and 72 as switch-over signals, and after the multiplexers 70 and 72 are switched over, connected to the battery, whose digital circuit does not produce chattering.</p> |
