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A detection circuit and detection method for an externally configured resistor

A technology of external resistance and detection circuit, applied in the direction of measuring resistance/reactance/impedance, measuring device, measuring electric variable, etc.

Active Publication Date: 2020-09-11
东莞市长工微电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When many different configurations are required, on the basis of insisting on reliable discrimination, more resistance value gear discrimination and limited power supply voltage range are a pair of contradictions

Method used

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  • A detection circuit and detection method for an externally configured resistor
  • A detection circuit and detection method for an externally configured resistor

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] refer to figure 1 ,Such as figure 1 As shown, a detection circuit for externally configured resistors includes several MOS transistors, several switches, a current source I0, an external resistor Rexternal, and a comparator; the current source I0 is respectively connected to the drain of the first MOS transistor T1 and The gates of several other MOS transistors; the sources of the first MOS transistor T1 are respectively connected to the sources of other several MOS transistors; the drains of several MOS transistors except the first MOS transistor T1 are respectively passed through several ...

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Abstract

The invention discloses a detection circuit for an external resistor. The circuit includes a plurality of MOS tubes, a plurality of switches, a current source I0, an external resistor Rexternal, a comparator. The current source I0 is connected with a drain electrode of a first MOS tube T1 and grid electrodes of the other MOS tubes. A source electrode of the first MOS tube T1 is connected with gridelectrodes of the other MOS tubes. Drain electrodes of the MOS tubes except the first MOS tube T1 are connected with in-phase terminals of the external resistor Rexternal and the comparator through aplurality of switches. The other end of the external resistor Rexternal is in ground connection. The reverse-phase terminal of the comparator is connected with a power source Vref. According to the invention, reliable distinguishing of a comparatively large amount of resistance value gears can be realized in a limited power voltage range.

Description

technical field [0001] The invention relates to an externally configured resistor of a circuit, in particular to a detection circuit and a detection method of an externally configured resistor. Background technique [0002] At present, many circuits realize different circuit configurations through different external connection resistance values. Such as working frequency, working mode, etc. When many different configurations are required, on the basis of insisting on reliable discrimination, more resistance value gear discrimination and limited power supply voltage range are a pair of contradictions. [0003] Generally, there are two methods for detecting the resistance level of external resistors: [0004] Method 1: Set the pin of the chip to output a fixed voltage value. When an external resistor is connected to the pin, a current reflecting the resistance of the external resistor will flow through the resistor. By judging the gear of the current value, you can Determin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/08
CPCG01R27/08
Inventor 李学宁万锦嵩
Owner 东莞市长工微电子有限公司
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