Circuit and method for detecting correct access of chip pin capacitor based on capacitance range

Abstract

The invention provides a circuit and a method for detecting correct access of a chip pin capacitor based on a capacitance range. One end of a first switch tube of the circuit is connected with a first current source, the other end of the first switch tube is connected with a first capacitor and a negative electrode end of a second comparator separately, the other end of the first capacitor is grounded, one end of a second switch tube is connected with a second current source, the other end of the second switch tube is connected with a second capacitor and the positive electrode end of the first comparator, the other end of the second capacitor is grounded, one end of a third switch tube is connected with a third current source, the other end of the third switch tube is connected with the negative end of the first comparator, the positive end of the second comparator, the output signal end of the chip and the chip pin capacitor, the output ends of the first comparator and the second comparator are connected with the two input ends of an AND gate circuit respectively, and the output end of the AND gate circuit is connected with the opening signal end of the chip. According to the invention, the chip can be ensured to be limited to work under the condition of abnormal pin connection, so that the chip cannot be damaged due to abnormal work.

Description

Technical field [0001] The present invention relates to the field of integrated circuits, in particular, to the circuit and method of detecting the correct access of the chip pin capacitance based on the capacitance range. Background technique [0002] In the actual application circuit, the capacitor plays a pivotal role in the circuit. In particular, the circuit of the input and output ports of the integrated circuit, whether the integrated circuit is working properly, or the advantages and disadvantages of working performance, it plays a crucial role. [0003] Current integrated circuit technology can not integrate large capacitors into the circuit, so many pins are needed to connect a capacitor to make the circuit work normally. There are also some circuits that avoid using too much capacitance due to the speed or other needs of the signal. The pin of the capacitor and the integrated circuit is to be connected by a PCB (printed circuit board). This connection, in the process o...

AI Technical Summary

Problems solved by technology

The rising and falling edges of the pin voltage or current may charge and discharge rapidly due to the lack of capacitance, which may cause false triggering of other parts of the circuit, especially the possibility of triggering the ESD (electrostatic protection) circuit, or causing a latch The lock effect (latch up), from further leading to rapid charge and discharge of the circuit, the chip may burn out after the voltage or current or temperature reaches a certain limit

There are also some circuits that require external capacitors to control the time of soft start. If there is a missing or virtual soldering of the pin capacitor at this time, it will definitely cause the soft start to fail, which will cause the entire system to be powered on too quickly, resulting in current, voltage, etc. The impact is too large, so it will cause serious damage to the next-level chip device or cause timing disorder

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