发明名称 |
Stable indicator circuit for photoelectric switch using an integrated circuit with reduced interconnections |
摘要 |
A photoelectric switch is adapted for use as either a transmission type or a reflection type switch. To provide an integrated circuit for the photoelectric switch and to minimize input/output pins, multiple functions are assigned to each input/output pin. Such functions are provided via first to fourth integrated circuit input/output pins, i.e., the first pin serves functions in the supply of a detection output and a self-diagnosing output; the second pin supports a circuit for driving a projection type LED and a circuit for turning the LED off; the third pin supports a circuit for reversing a stable indication output and an operation indicating output; and the fourth pin supports a circuit for amplifying a received photo-signal and for controlling the mode of combination of photoelectric signals from a pair of photo-diodes. The photoelectric switch includes a support circuit external of the integrated circuit for supporting the various functions provided via the first to fourth pins and two additional pins used in providing operating power.
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申请公布号 |
US5034601(A) |
申请公布日期 |
1991.07.23 |
申请号 |
US19900551500 |
申请日期 |
1990.07.11 |
申请人 |
ASTEX CO., LTD.;TAKENAKA ELECTRONIC IND. CO., LTD. |
发明人 |
FUKUYAMA, TOSHIFUMI |
分类号 |
H01L27/144;H03K17/082;H03K17/18;H03K17/795 |
主分类号 |
H01L27/144 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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