Electrifying circuit on mobile terminal camera

A mobile terminal and camera technology, applied in the field of cameras, can solve problems such as prolonging the time to market of products and increasing R&D investment, and achieve the effects of shortening project cycle, reducing R&D costs and enhancing compatibility

Inactive Publication Date: 2009-09-16
WINGTECH COMM
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AI-Extracted Technical Summary

Problems solved by technology

[0003] At present, most of the mobile phones on the market only support one type of pixel camera, and the mobile phone models with different camera pixels ar...
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Abstract

The invention discloses an electrifying circuit on a mobile terminal camera, wherein a camera module comprises a front camera compatible with 0.16/0.30/1.30 megapixels and a back camera compatible with 0.30/1.30/2.00 megapixels, and a power supply module comprises a first LDO power supply, a second LDO power supply and a DC-DC power supply with adjustable voltage; both the front camera and the back camera comprise three paths of power supplies, and both an analog power supply AVDD and an I/O power supply DOVDD are provided by the second LDO power supply; a digital power supply DVDD of the front camera is provided by the first LDO power supply; when the back camera is of 0.30/1.30 megapixels, the digital power supply DVDD is provided by the first LDO power supply; and when the back camera is of 2.00/3.00 megapixels, the digital power supply DVDD is provided by the DC-DC power supply. With the electrifying circuit on the mobile terminal camera, cameras with different pixels can be configured on a mainboard of a same mobile phone freely according to different requirements.

Application Domain

Television system detailsColor television details +1

Technology Topic

EngineeringVoltage +3

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  • Electrifying circuit on mobile terminal camera
  • Electrifying circuit on mobile terminal camera

Examples

  • Experimental program(1)

Example Embodiment

[0021] The specific implementations of the present invention will be further described in detail below in conjunction with the drawings and examples, but the protection scope of the present invention should not be limited by this.
[0022] figure 1 It is a simplified diagram of the camera module system of the mobile terminal. The camera system of the mobile terminal mainly includes a multimedia processing module 101, a camera module 102, and a power supply module 103. The camera is connected to the multimedia processing module through a CCIR (Consultative Committee Intemathnal Radio) bus. The multimedia processing module 101 may be a baseband chip or an external multimedia processor. PWON and CAM_PWDN are control signals from the baseband chip or an external multimedia processor. PWON is the power enable signal of the camera, and CAM_PWDN is the power-down control signal of the camera module. PWON and CAM_PWDN are control signals from the baseband chip or an external multimedia processor.
[0023] figure 2 Design a block diagram for the front and rear cameras to be compatible with power-on. Such as figure 2 As shown, the camera module 102 includes a front camera compatible with 16/30/1.3 million pixels and a rear camera compatible with 30/130/2 million pixels. The front camera can be used in three specifications of 16/30/130, but the power supply needs to be configured accordingly, as is the rear camera. The power module includes a 1.8V first LDO power supply, a 2.8V second LDO power supply and a voltage adjustable DC-DC power supply. The model of the first LDO power supply is RT9193-18PU5, the model of the second LDO power supply is RT9193-28PU5, and the model of the DC-DC power supply is RT8009.
[0024] The control chip of the compatible 16 million pixel camera is Omnivision's OV6680, the control chip of the 300 million pixel camera is OV7660 or OV7680, the control chip of the 1.3 million pixel camera is OV9650, the control chip of the 2 million pixel camera is OV2640, 3 million pixels The control chip of the camera is OV3640.
[0025] The front and rear cameras have three power sources, including digital power DVDD, analog power AVDD, and I/O power DOVDD. AVDD and DOVDD are both provided by a 2.8V LDO; when the rear camera is 30/1.3 million pixels, its DVDD and front The DVDD of the camera is the same, which is provided by a 1.8V LDO; when the rear camera is 2 or 3 million pixels, its DVDD is provided by a voltage-adjustable DC-DC. When the rear camera is 3 million pixels, there is also a VNF power supply for powering the focusing motor, and the VNF also comes from 2.8VLDO. The focusing motor is located inside the camera module.
[0026] When the rear camera is 2 million pixels (OV2640), the DVDD voltage range is 1.24~1.36V, and the DC-DC (RT8009) output voltage needs to be adjusted to 1.3V; when the rear camera is 3 million pixels (OV3640), its DVDD The voltage range is 1.425~1.575V, and the output voltage of DC-DC (RT8009) needs to be adjusted to 1.5V. The voltage output setting of DC-DC (RT8009) is shown in Figure 3.
[0027] DVDD=V OUT =V REF (1+R1/R2),
[0028] Among them, the reference voltage V REF =0.5V, R1+R2<1MΩ.
[0029] Among the above-mentioned cameras, OV3640 consumes the most power, its DVDD consumes about 80mA, AVDD consumes about 40mA, and DOVDD consumes about 110mA. VNF power consumption is generally tens of mA.
[0030] The rated output currents of the two LDOs selected in the embodiment are both 300mA. AVDD, DOVDD and VNF are all powered by RT9193-28PU5, and the total maximum power consumption is about 200mA, which is less than the rated output current of RT9193-28PU5. The voltage output of RT8009 is adjustable from 0.5V to input power voltage (mobile terminal battery voltage 3.6 to 4.2V), and the rated output current is 600mA. The maximum power consumption of DVDD is about 40mA, which is much less than the rated output current of RT8009.
[0031] The camera power enable signal PWON is controlled by a GPIO from the baseband chip or external multimedia processor. PWON is directly connected to the 1.8V LDO enable signal, and is connected to the 2.8V LDO enable signal through an RC delay circuit.
[0032] Since the DVDD power-on timing of the camera is generally required to be no later than AVDD and DOVDD, if the same power supply enable signal control is used, the LDO power-on speed is generally about 10us, and the DC-DC power-on time is greater than 100us, so that DC- The power-on sequence of DC-powered DVDD may be later than AVDD and DOVDD, so an RC delay circuit is added. The delay time t=1/RC, here R=10k, C=1uF, and the delay is about 100us.
[0033] figure 2 CAM_PWDN1 is the power-down control signal of the front camera, and CAM_PWDN2 is the power-down control signal of the rear camera, which comes from the baseband chip or external multimedia processor.
[0034] When the front camera is working, the PWON signal is set high, the camera power is turned on, the CAM_PWDN1 signal is set low, and the CAM_PWDN2 signal is set high;
[0035] When the rear camera is working, the PWON signal is set high, the camera power is turned on, the CAM_PWDN2 signal is set low, and the CAM_PWDN1 signal is set high;
[0036] To avoid leakage current during standby, when the cameras are all turned off, the PWON signal is set low, the camera power is all turned off, and both CAM_PWDN1 and CAM_PWDN2 are set high.
[0037] The present invention provides a power-on circuit compatible with multiple pixel cameras, which can freely select and configure 16/30/1.3 million pixel front cameras and 30/130/200/3 million pixel rear cameras according to requirements, which enhances the mobile terminal main board Compatibility, reduced research and development costs, and shortened the project cycle.
[0038] The above descriptions are only preferred embodiments of the present invention, and are not used to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made in accordance with the content of the patent application scope of the present invention should be within the technical scope of the present invention.
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  • Improve compatibility
  • Reduce R&D costs

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