Product Description
Version 1.1, June 22, 2006 Proprietary to OmniVision Technologies 7
O
mni ision
3 Product Description
3.1 Overview
OmniVision Technologies Inc. supplies prototyping and evaluation modules to demonstrate
operation of the associated C
AMERACHIP products, as well as to demonstrate associated
companion back-end system ASICs, where required.
The OV7670/OV7171 EAA Prototyping Module is intended for general design-in and evaluation
purposes. The module provides a simple 32-pin header-connector interface to the relevant I/O and
control registers of the OV7670/OV7171 C
AMERACHIP. The module includes the necessary 24 Mhz
crystal, capacitors, and resistors.
The OV7670/OV7171 EAA Prototyping Module can be directly connected to any companion
back-end ASIC solution or system interface. The header-connector interface allows for access to
the 10-bit digital output data, PCLK, vertical sync, and horizontal sync signals. The back-end
interface can use the Serial Camera Control Bus (SCCB) interface software to adjust the control
register values.
3.2 System Design Considerations
There are several implementation tips to consider for achieving the best results with the
C
AMERACHIP:
• Be certain to provide a clean power source to the C
AMERACHIP, especially the AVDD and
SVDD power pins.
• The C
AMERACHIP may be adversely affected by transient heat produced by associated
components on the PCB. Avoid placement of heat-producing components on the PCB directly
adjacent to or on the back-side of the C
AMERACHIP. This will limit heat transfer to the
C
AMERACHIP and reduce the possibility of a poor image and failed components.
• To minimize the resistance and inductance of the PCB traces, be certain to design the PCB
with the coupling bypass capacitors as close as possible to the C
AMERACHIP power pin(s).
• To avoid ground-plane noise issues, use a separate PCB trace for the AGND and the DGND
pins. Connect the two ground traces at a single point to the system ground.
• Orient the C
AMERACHIP on the PCB with pin 1 down when facing the chip. This application will
result in normal image attributes (i.e., right-side up images).
3.3 Module Schematic
Refer to Figure 3-1 for the PCB schematic for the OV7670/OV7171 EAA Prototyping Module. This
schematic is provided to assist the development engineer with incorporating the OV7670/OV7171
C
AMERACHIP into product designs. The schematic also includes the header-connector pin interface
information of the OV7670/OV7171 EAA Prototyping Module for easy system integration and
C
AMERACHIP evaluation.
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