Pressure Sensor

Abstract

Provided is a pressure sensor that is equipped with a pressure detection element and is capable of preventing data of an EPROM from being lost by application of high-voltage pulse noise to a writing terminal. A GND terminal (21 d) that is one of output terminals of the pressure detection element (21) and an EPROM drain terminal (21 h) that is one of EPROM writing terminals are connected via a capacitor (60). The GND terminal (21 d) is grounded via a lead pin (33A). With this configuration, even when the high-voltage pulse noise is applied to the EPROM drain terminal (21 h) and a lead pin (36a) connected to the EPROM drain terminal (21 h), the high-voltage pulse noise can be released to ground via the capacitor (60), and data of EPROM (21 a) can be prevented from being lost.

Description

technical field [0001] The present invention relates to a pressure sensor with a pressure detection element having an EPROM and a terminal for writing to the EPROM. In particular, the present invention relates to a pressure sensor capable of preventing The information stored in the EPROM can be erased by the pulse noise of the high voltage on the EPROM. Background technique [0002] Conventionally, various pressure sensors have been proposed in which a liquid is sealed in a pressurized space containing a pressure detecting element having a nonvolatile memory such as EPROM (Erasable Programmable Read Only Memory), Pressure applied to the pressure detection chamber from the outside is transmitted to the pressure detection element through the liquid, whereby a voltage signal corresponding to the external pressure is output from the pressure detection element. [0003] As an example of the above-mentioned liquid-enclosed pressure sensor, Patent Document 1 describes a pressure s...

AI Technical Summary

Problems solved by technology

[0009] However, in conventional pressure sensors, EPROM data may be lost

Investigating the cause, it was found that data loss occurred due to pulse noise, etc., where a high voltage was applied to the pressure detection element.

Investigating the cause in more detail, due to repeated application of high-voltage pulse noise to the drain terminal of the EPROM, the charge stored in the floating gate decreases, and the data stored in the EPROM will be misplaced, that is, data loss will occur.

As a result, the correct signal cannot be output from the pressure detection element, and as a result, the pressure sensor may not operate correctly.

Images