Temperature sensing circuit, semiconductor integrated circuit and regulating method thereof

A temperature sensing circuit and circuit technology, which is applied in the manufacturing of semiconductor devices, circuits, and semiconductor/solid-state devices, etc., can solve the problems of changes in the manufacturing steps of temperature sensing circuits and different chips, and achieve simplified control and flexible temperature compensation. , the effect of high-precision temperature compensation

Inactive Publication Date: 2007-11-28
SEIKO EPSON CORP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] However, because the manufacturing process of the temperature sensing circuit itself varies, even if the ambient temperature is the same, the value output from the chip is different, so high-precision temperature compensation corresponding to the ambient temperature cannot be performed.

Method used

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  • Temperature sensing circuit, semiconductor integrated circuit and regulating method thereof
  • Temperature sensing circuit, semiconductor integrated circuit and regulating method thereof
  • Temperature sensing circuit, semiconductor integrated circuit and regulating method thereof

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Embodiment Construction

[0035] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the embodiments described below do not improperly limit the content of the present invention described in the scope of the claims. In addition, all the constitutions described below are not necessarily essential constitutional requirements of the present invention.

[0036] 1. Semiconductor integrated circuits

[0037] FIG. 1 shows an outline of the configuration of a semiconductor integrated circuit with a built-in temperature sensor circuit in this embodiment.

[0038] The semiconductor integrated circuit 10 includes a temperature sensing circuit 100, an electronic volume 200, and a power supply circuit 300. The semiconductor integrated circuit 10 outputs an analog voltage or a digital value as a sensor output of the temperature sensor circuit 100 through an output terminal. In addition, a set value is set on the electronic ...

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Abstract

A reference voltage generating circuit 110 generates a reference voltage. A fuse circuit (regulating circuit) 120 divides the reference voltage by resistance to output a first regulatable divided voltage. A current generating circuit 130 generates a current according to the first divided voltage as a gate voltage. A voltage generating circuit 140 has a diode element generating an analogue voltage according to the current. The analogue voltage can be outputted through an operational amplifier circuit 142 connected as a voltage follower. The analogue voltage is converted into a digital value by an A / D converter circuit 150. The converter circuit 150 compares a second divided voltage controlled by a variable control circuit 154 by using a count value of a counter 156 with the analogue voltage by a comparator 152, and then a register 160 acquires a result of comparison on the basis of a result of the comparison.

Description

Technical field [0001] The invention relates to a temperature sensing circuit, a semiconductor integrated circuit provided with the temperature sensing circuit, and a method for adjusting the temperature sensing circuit. Background technique [0002] In general, the display control circuit of a display device using an electro-optical element needs to consider the temperature dependence of the electro-optical element. Taking the liquid crystal in an electro-optical element as an example, if the ambient temperature is different, the transmittance of the liquid crystal under the same voltage will also be different. Therefore, the display control circuit needs to perform temperature compensation and apply a voltage corresponding to the ambient temperature. [0003] In this context, the display control circuit often has a built-in temperature sensing circuit. In this case, the temperature sensor circuit is used to adjust to obtain the sensor output at the reference ambient temperature...

Claims

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Application Information

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IPC IPC(8): G01K7/01G01K1/20H01L21/66H01L21/822H01L27/04H03M1/12
CPCG01K2219/00G01K7/01H01L22/00
Inventor 土屋雅彦
Owner SEIKO EPSON CORP
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