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Open circuit detector using depletion type transistor and using method thereof

A depletion-type transistor and open-circuit detection technology, which is applied in the direction of instruments, measuring electronics, and measuring devices, can solve the problem of no open-circuit detection circuit and achieve the effect of ensuring safe operation

Active Publication Date: 2010-06-16
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] At present, the known automotive sensor chip has no open circuit detection circuit

Method used

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  • Open circuit detector using depletion type transistor and using method thereof
  • Open circuit detector using depletion type transistor and using method thereof
  • Open circuit detector using depletion type transistor and using method thereof

Examples

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Embodiment Construction

[0010] Such as figure 1 As shown, the present invention provides an open circuit detector using a depletion transistor; it includes a voltage pump module, the voltage pump module is connected with a depletion PMOS tube, the voltage pump module is used to output a voltage higher than the chip reference voltage VDD Flat; the depletion type PMOS tube is connected with an open circuit detection module, and the open circuit detection module is connected with the reference voltage VDD.

[0011] Such as figure 1 , figure 2 As shown, when the chip is working normally, the voltage pump module outputs a level higher than VDD (2VDD-VTH) to control a depletion type PMOS tube (P1 in the figure), this specially designed depletion type PMOS tube VT is about 0.3V, making P1 in the off state, and the open circuit detection module is off, which does not affect the normal operation of the chip. When the ground of the chip is disconnected from the external ground, the ground of the chip is pulled u...

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Abstract

The invention discloses an open circuit detector using depletion type transistor and a using method thereof. The detector comprises a voltage pump module, wherein the voltage pump module is connected with a depletion type PMOS pipe; the voltage pump module is used for outputting a level higher than a reference voltage VDD of a chip; the depletion type PMOS pipe is connected with an open circuit detector module; and the open circuit detector module is connected with the reference voltage VDD. By adopting the open circuit detector using the depletion type transistor, the chip of a motorcar sensor has an open circuit detection function, so the reliability of the system is improved.

Description

Technical field [0001] The invention relates to the field of semiconductor integrated circuit design. Background technique [0002] Currently, there is no open circuit detection circuit in the well-known automotive sensor chip. When the chip ground is disconnected, the overall equivalent impedance of the chip is connected in series with the load resistance, so that the output of the chip is in a high-impedance state, in the range of the normal output voltage, and the system will make a wrong judgment. Summary of the invention [0003] The technical problem to be solved by the present invention is to provide an open circuit detector using a depletion transistor, which can make the automobile sensor chip have an open circuit detection function and improve the system reliability. [0004] In order to solve the above technical problems, the present invention provides an open circuit detector using a depletion transistor; it includes a voltage pump module, the voltage pump module is con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 古炯钧王楠周平
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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