ADNS-2620 Avago Technologies US Inc., ADNS-2620 Datasheet - Page 23

• Manufacturer Part Number: ADNS-2620
• Description: Optical Mouse Sensor,DIP
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-2620

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 516-2238-5; ADNS-2620; Q2073278A

Pixel_Sum
Access: Read
Data Type: Upper 8 bits of a 1-bit unsigned integer.
USAGE:
Pixel Data
Access: Read/Write
Data Type: Two status bits, six bit pixel data.
USAGE:

This register is used to find the average pixel value. It reports the upper 8 bits of a 1-bit unsigned integer, which sums all  pixels in the
current frame. It may be described as the full sum divided by 18. The formula to calculate the average pixel value is as below:
Average Pixel = Register Value x 18 / 
The maximum register value is 19 ( x  / 18 truncated to an integer). The minimum is 0. The pixel sum value may vary from frame to frame.
Digital Pixel data. Minimum value = 0, maximum value = . Any writes to this register resets the pixel hardware so that the next read from the
Pixel Data register will read pixel #1 and the StartOfFrame bit will be set. Subsequent reads will auto increment the pixel number.
To dump a complete image, set the LED to forced awake mode, write anything to this register, then read  times where the DataValid bit is set.
On the th read, the StartOfFrame bit will be set indicating that we have completed one frame of pixels and are starting back at pixel 1.
It takes at least  frames to complete an image as we can only read 1 pixel per frame.
The pixel hardware is armed with any read or write to the Pixel Data register and will output pixel data from the next available frame. So, if you
were to write the Pixel Data register, wait  seconds then read the Pixel Data register; the reported pixel data was from  seconds ago.
Field Name
SOF
Data_Valid
PD
Field
Field
Bit
Bit

–PD
0
SOF
= Pixel_Sum x 0.9
PS
7
7
7
Data_Valid
PS



Address: 0x47
Reset Value: 0x00
Address: 0x48
Reset Value: 0x00
PD
PS


Description
Start of Frame
0 = Not start of frame
1 = Current pixel is number 1, start of frame
There is valid data in the frame grabber
Six bit pixel data


PD
PS




PS
PD




PD
PS




PS
PD
1
1
1
1
PD
PS
0
0
0
0