AN2676 Freescale Semiconductor / Motorola, AN2676 Datasheet - Page 2

• Manufacturer Part Number: AN2676
• Description: Image Capture with i.MX21
• Manufacturer: Freescale Semiconductor / Motorola

Hardware Configuration
3 Hardware Configuration
Figure 1 shows the basic connection of a sensor to i.MX21.
In this basic connection, the following ports are identified:
The i.MX21 CSI module has an 8-bit input port. If the sensor has more than 8-bit data, connect the most
significant bits to i.MX21, and leave the rest of the bits floating.
Sensors are usually controlled by the I
high level protocol is specific to the sensor. For more information, see the user manual of the particular
sensor being used.
Some of the basic sensor controls, for example, reset and standby, are done through hardware signals.
These can be implemented with GPIO ports for i.MX21.
A sensor master clock can be provided by i.MX21, or by an external oscillator.
2
•
•
•
CSI Port: Image data transfer
I
GPIO: Sensor control
2
C Port: Sensor configuration
Figure 1. Basic Connection of a Sensor to i.MX21
Freescale Semiconductor, Inc.
For More Information On This Product,
Sensor
MC9328MX21 Application Note
OSC
2
C port as slave devices. The low level protocol is I
Go to: www.freescale.com
STANDBY
I2C_SDA
I2C_SCL
PIXCLK
VSYNC
HSYNC
D[7..0]
RESET
MCLK
GPIO
CSI
I2C
2
C, while the
MOTOROLA