Automatic image sensor activation module

Abstract

This disclosure provides an automatic startup module for an image sensor, comprising multiple power detection circuits, multiple delay control circuits, a controller, and an image sensor. The multiple power detection circuits are respectively coupled to a drive power supply and a reference voltage source, and generate an enable signal in response to determining that a first potential of the drive power supply is lower than a second potential of the reference voltage source. The multiple delay control circuits are respectively coupled to the output terminals of one of the multiple power detection circuits and the drive power supply, and delay outputting the first potential in response to the enable signal. The controller is coupled to the output terminal of a first delay control circuit included in the multiple delay control circuits and is used to send an initialization signal. The image sensor is coupled to the output terminal of a second delay control circuit included in the multiple delay control circuits and starts up in response to the initialization signal.

Claims

1. An image sensor automatic start-up module, comprising: a plurality of power detection circuits respectively coupled to a driving power supply and a reference voltage source, each power detection circuit being configured to compare a first potential of the driving power supply and a second potential of the reference voltage source, and generating an enable signal in response to determining that the first potential is lower than the second potential; a plurality of delay control circuits respectively coupled to the output terminal of one of the plurality of power detection circuits and the driving power supply, each delay control circuit delaying the output of the first potential in response to the enable signal; a controller coupled to the output terminal of a first delay control circuit included in the plurality of delay control circuits, the controller being configured to send an initialization signal; and an image sensor coupled to the output terminal of a second delay control circuit included in the plurality of delay control circuits, the image sensor being started in response to the initialization signal.

2. The image sensor automatic start module as described in claim 1, wherein, The power detection circuit stops generating the enable signal in response to determining that the first potential is higher than the second potential.

3. The image sensor automatic start module as described in claim 1, wherein, Each of the delay control circuits includes a delay enable circuit and a load switch. The delay enable circuit is coupled to the output of one of the plurality of power detection circuits and enables the load switch after delaying the enable signal. The load switch is coupled to the drive power supply and is configured to output the first potential of the drive power supply after enabling.

4. The image sensor automatic start module as described in claim 3, wherein, The first delay control circuit delays the enable signal by a first time, and the second delay control circuit delays the enable signal by a second time, the second time being greater than the first time.

5. The image sensor automatic start module as described in claim 3, wherein, The delayed enable circuit includes a P-type field-effect transistor, a capacitor, and a resistor. The source of the P-type field-effect transistor is coupled to a power supply and the gate is coupled to the output of the power supply detection circuit. The resistor is coupled between the drain of the P-type field-effect transistor and the load switch, and one end of the resistor is grounded through the capacitor.

6. The image sensor automatic start module as described in claim 1 further includes a reset control circuit coupled between the output of a third delay control circuit included in the plurality of delay control circuits and a reset pin of the image sensor, wherein the image sensor releases the reset state in response to the reset pin being triggered.

7. The image sensor automatic start module as described in claim 6, wherein, The second delay control circuit delays the enable signal by a second time, and the third delay control circuit delays the enable signal by a third time, the third time being greater than the second time.

8. The image sensor auto-start module as described in claim 1 further includes a clock generator coupled between the output of a third delay control circuit included in the plurality of delay control circuits and a clock pin of the image sensor. The clock generator generates a clock signal in response to the triggering of the third delay control circuit, and the image sensor captures an image and generates an image stream in response to the triggering of the clock signal.

9. The image sensor automatic start module as described in claim 1, wherein, The power detection circuit includes a comparator, the non-inverting input of which is coupled to the driving power supply and the inverting input of which is coupled to the reference voltage source. The positive power supply of the comparator is coupled to a power supply having the enable signal potential, and the negative power supply of the comparator is coupled to a ground terminal.

10. The image sensor automatic start module as described in claim 1, wherein, The image sensor includes multiple power input terminals, which are respectively coupled to the output terminals of multiple delay control circuits. The multiple delay control circuits delay the enable signal for different times and sequentially output the first potential to each of the multiple power input terminals to start the image sensor.

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