OV5642 datasheet(21/208 Pages) OMNIVISION

21 / 208 page

01.08.2009

PRELIMINARY SPECIFICATION

proprietary to OmniVision Technologies

2-1

2 system level description

2.1 overview

The OV5642 (color) image sensor is a low voltage, high-performance, 1/4-inch 5 megapixel CMOS image sensor that

provides the full functionality of a single chip 5 megapixel (2592x1944) camera using OmniBSI™ technology in a small

footprint package. It provides full-frame, sub-sampled, windowed or arbitrarily scaled 8-bit/10-bit images in various

formats via the control of the Serial Camera Control Bus (SCCB) interface or MIPI interface.

The OV5642 has an image array capable of operating at up to 15 frames per second (fps) in 5 megapixel resolution with

complete user control over image quality, formatting and output data transfer. All required image processing functions,

including exposure control, gamma, white balance, color saturation, hue control, defective pixel canceling, noise

canceling, etc., are programmable through the SCCB interface, MIPI interface or embedded microcontroller. The

OV5642 also includes a compression engine for increased processing power. In addition, Omnivision image sensors use

proprietary sensor technology to improve image quality by reducing or eliminating common lighting/electrical sources of

image contamination, such as fixed pattern noise, smearing, etc., to produce a clean, fully stable, color image.

The OV5642 has an embedded microcontroller, which can be combined with an internal autofocus engine and

programmable general purpose I/O modules (GPIO) for external autofocus control. It also provides an anti-shake

function with an internal anti-shake engine. For identification and storage purposes, the OV5642 also includes a one-time

programmable (OTP) memory.

Compared to its predecessor, the OV5642 has embedded TrueFocus™ Lite that enables extended depth of field (EDoF).

The OV5642 supports both a digital video parallel port and a serial MIPI port. The MIPI and ISP interface can be used

for a second camera sensor without requiring a dual serial port camera system.

2.2 architecture

The OV5642 sensor core generates streaming pixel data at a constant frame rate, indicated by HREF and VSYNC.

figure 2-1 shows the functional block diagram of the OV5642 image sensor. figure 2-2 shows an example application

using an OV5642 sensor.

The timing generator outputs signals to access the rows of the image array, precharging and sampling the rows of the

array in series. In the time between pre-charging and sampling a row, the charge in the pixels decreases with the time

exposed to the incident light. This is known as exposure time.

The exposure time is controlled by adjusting the time interval between precharging and sampling. After the data of the

pixels in the row has been sampled, it is processed through analog circuitry to correct the offset and multiply the data

with corresponding gain. Following analog processing is the ADC which outputs 10-bit data for each pixel in the array.

OV5642 Datasheet(PDF) 21 Page - OmniVision Technologies, Inc.