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Close-range optical detection circuit, method and chip

An optical detection and short-range technology, applied in the direction of optical device exploration, etc., can solve the problems of increasing overall power consumption, increasing hardware costs, and prolonging the promotion period, and achieve the effects of reducing costs, reducing power consumption, and improving anti-interference ability.

Pending Publication Date: 2021-10-29
深圳市敏锐微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solution has the following problems: (1) due to the use of peripheral components and MCU solutions, hardware and processing costs are increased; (2) the detection function is controlled by the MCU solution, which increases the development cost of the solution and prolongs the promotion period; (3) the reset of the photosensitive unit The voltage is easily disturbed by the outside world, the detection accuracy is not high, and it is difficult to do longer distance or graded distance detection; (4) The image value is easily saturated under strong light, so the detection fails
However, due to the complex environment of short-distance detection applications, especially under strong light, in order to ensure that the node voltage is not lower than V th , the exposure time must be shortened, and to obtain the image difference between LED exposure and non-exposure, a larger LED exposure current is required, so an external drive tube must be sampled, which increases hardware costs, and the increase in current will also lead to increase in overall power consumption

Method used

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  • Close-range optical detection circuit, method and chip
  • Close-range optical detection circuit, method and chip
  • Close-range optical detection circuit, method and chip

Examples

Experimental program
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Effect test

Embodiment 1

[0038] like Figure 4 As shown, a short-range optical detection circuit includes an LDO voltage stabilizing circuit, a lighting module, and a processing module. The lighting module includes a photosensitive circuit and a sampling circuit, and the processing module includes an amplification circuit, an ADC converter, and a digital processing integrated circuit. The LDO voltage regulator The circuit is connected with the photosensitive circuit and the sampling circuit, the sampling circuit is connected with the amplifying circuit, the amplifying circuit is connected with the ADC converter, and the digital processing integrated circuit is respectively connected with the LDO voltage stabilizing circuit, the amplifying circuit and the ADC converter.

[0039] like Figure 5 As shown, the LDO voltage regulator circuit includes an LDO voltage regulator U1 and an image reset tube P0, the photosensitive circuit includes a light emitting diode D1 and a variable capacitor C0, the LDO volt...

Embodiment 2

[0053] Such as Figure 8 Shown, a kind of short-distance optical detection method, the step comprises:

[0054] S1: The digital processing integrated circuit configures the image exposure time and the driving current of the external LED light for conventional ambient light detection;

[0055] Specifically, before the short-distance optical detection is performed, the image exposure time and the driving current of the external LED light are configured through the digital processing integrated circuit U2 according to the power consumption requirements.

[0056] S2: The lighting module samples the conventional ambient light image and obtains the first image value, and the digital processing integrated circuit adjusts and configures the output voltage of the LDO voltage regulator and the variable capacitor value to control the ADC conversion value of the first image value within the range of the ADC converter within the scope;

[0057] Specifically, after the image exposure tim...

Embodiment 3

[0069] A short-distance optical detection chip includes the above-mentioned short-distance optical detection circuit.

[0070] The chips provided in the embodiments of the present invention are for brief description, and for those not mentioned in the embodiments, reference may be made to the corresponding content in the foregoing embodiments.

[0071] The invention significantly improves the anti-interference ability, light-sensing precision and light-sensing ability of optical detection, can adapt to different application environments through an adaptive algorithm, and can also realize intermittent detection, reduce power consumption, and reduce costs.

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Abstract

The invention discloses a close-range optical detection circuit, method and chip, the circuit comprises an LDO voltage stabilizing circuit, a lighting module and a processing module, the lighting module comprises a photosensitive circuit and a sampling circuit, and the processing module comprises an amplification circuit, an ADC converter and a digital processing integrated circuit. The LDO voltage stabilizing circuit is connected with the photosensitive circuit and the sampling circuit, the sampling circuit is connected with the amplifying circuit, the amplifying circuit is connected with the ADC converter, and the digital processing integrated circuit is respectively connected with the LDO voltage stabilizing circuit, the amplifying circuit and the ADC converter. According to the invention, the optical detection anti-interference capability, the light sensing precision and the light sensing capability are obviously improved, different application environments can be adapted through a self-adaptive algorithm, intermittent detection can be realized, the power consumption is reduced, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a short-distance optical detection circuit, method and chip. Background technique [0002] At present, the application of optical proximity sensors has been popularized, such as mobile phone screen switch, Bluetooth earphone in-ear detection, sensor faucet and car trunk sensor switch, etc., which are widely used in most home appliances, mobile computer peripherals and industrial control fields. [0003] Traditional short-distance applications are mainly based on MCU solutions, such as figure 1 As shown, its control timing is as follows figure 2 As shown, the image is reset before each image detection, and the environmental image value is sampled once by the sampler (P 0 ), reset again, turn on the LED light, sample the environment plus the LED exposure image value once (P 1 ), and set the distance sensing threshold (P th ), if satisfying P 1 -P 0 >P th , it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V8/10
CPCG01V8/10
Inventor 肖永贵曾德智
Owner 深圳市敏锐微电子有限公司