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发明公开
CN109921780A 复用引脚电路 有权

复用引脚电路
摘要：
本发明提供一种复用引脚电路，包括：第一切换开关S1，第一切换开关S1的一端与电压VPP电连接，第一切换开关S1的另一端与电压PAD电连接；第二切换开关S2，第二切换开关S2的一端与电压VPP电连接，第二切换开关S2的另一端与电压VDD电连接；电压检测模块I1，电压检测模块I1的正相输入端与电压VDD电连接，电压检测模块I1的反相输入端与电压PAD电连接，电压检测模块I1的输出端与第二切换开关S2电连接；回滞反相器I2，回滞反相器I2的输入端与电压检测模块I1的输出端电连接，回滞反相器I2的输出端与第一切换开关S1电连接。与现有技术相比，本发明的有益效果如下：简单有效，布版图的面积小，成本低，节省芯片引脚资源和芯片面积。
摘要（英）：

The invention provides a multiplexing pin circuit, which comprises a first change-over switch S1, a second change-over switch S2, a voltage detection module I1 and a hysteresis inverter I2, and is characterized in that one end of the first change-over switch S1 is electrically connected with voltage VPP, and the other end of the first change-over switch S1 is electrically connected with voltage PAD; one end of the second change-over switch S2 is electrically connected with the voltage VPP, and the other end of the second change-over switch S2 is electrically connected with the voltage VDD; thenon-inverting input end of the voltage detection module I1 is electrically connected with the voltage VDD, the inverting input end of the voltage detection module I1 is electrically connected with the voltage PAD, and the output end of the voltage detection module I1 is electrically connected with the second change-over switch S2; and the input end of the hysteresis inverter I2 is electrically connected with the output end of the voltage detection module I1, and the output end of the hysteresis inverter I2 is electrically connected with the first change-over switch S1. Compared with the priorart, the method has the advantages of being simple, effective, small in layout area, low in cost and capable of saving chip pin resources and the chip area.

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