Help Identifying a CMOS optical mouse sensor?
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I'm working to repurpose the trackball assembly of a Logitech Trackman wired mouse for use in an experimental rig. I assumed that Logitech would use Avago's ADNS series of optical flow sensors, but it doesn't appear that way. I've managed to carefully disassemble down to the sensor, but still can't find a part number. One side of the chip reads "M8aSN" but this returned nothing from Google. The sensor assembly had 6 leads running to a PIC, while the sensor itself has four pins.
I'm hoping that some sleuths here might have some ideas. Thanks in advance.
Logitech mouse specs:
https://support.logitech.com/en_us/product/trackman-marble/specs
Avago ADNS series sensors (seemingly not what I'm looking at due to the difference in pin-out) [PDF!]:
http://media.digikey.com/PDF/Data%20Sheets/Avago%20PDFs/ToolKitSelectionGuide.pdf
Lastly, here is the most similar-looking component I've been able to find so far. It has four pins though it is surface-mount:
https://www.vishay.com/ppg?84286
Photos of what I've got:
chip-side:
mysterious "M8aSN":
full assembly of LEDs, chip, components-- this has 6 leads
led pcb sensor identification cmos
asked 4 hours ago
Spencer WilsonSpencer Wilson
162
New contributor
Spencer Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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add a comment |
$begingroup$
I'm working to repurpose the trackball assembly of a Logitech Trackman wired mouse for use in an experimental rig. I assumed that Logitech would use Avago's ADNS series of optical flow sensors, but it doesn't appear that way. I've managed to carefully disassemble down to the sensor, but still can't find a part number. One side of the chip reads "M8aSN" but this returned nothing from Google. The sensor assembly had 6 leads running to a PIC, while the sensor itself has four pins.
I'm hoping that some sleuths here might have some ideas. Thanks in advance.
Logitech mouse specs:
https://support.logitech.com/en_us/product/trackman-marble/specs
Avago ADNS series sensors (seemingly not what I'm looking at due to the difference in pin-out) [PDF!]:
http://media.digikey.com/PDF/Data%20Sheets/Avago%20PDFs/ToolKitSelectionGuide.pdf
Lastly, here is the most similar-looking component I've been able to find so far. It has four pins though it is surface-mount:
https://www.vishay.com/ppg?84286
Photos of what I've got:
chip-side:
mysterious "M8aSN":
full assembly of LEDs, chip, components-- this has 6 leads
led pcb sensor identification cmos
asked 4 hours ago
Spencer WilsonSpencer Wilson
162
New contributor
Spencer Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
$begingroup$
Do you have schematics of how it was used in the original application?
$endgroup$
– Hearth
4 hours ago
$begingroup$
That photo doesn't appear to be at all similar to Avago ADNS chip.
$endgroup$
– glen_geek
2 hours ago
add a comment |
$begingroup$
I'm working to repurpose the trackball assembly of a Logitech Trackman wired mouse for use in an experimental rig. I assumed that Logitech would use Avago's ADNS series of optical flow sensors, but it doesn't appear that way. I've managed to carefully disassemble down to the sensor, but still can't find a part number. One side of the chip reads "M8aSN" but this returned nothing from Google. The sensor assembly had 6 leads running to a PIC, while the sensor itself has four pins.
I'm hoping that some sleuths here might have some ideas. Thanks in advance.
Logitech mouse specs:
https://support.logitech.com/en_us/product/trackman-marble/specs
Avago ADNS series sensors (seemingly not what I'm looking at due to the difference in pin-out) [PDF!]:
http://media.digikey.com/PDF/Data%20Sheets/Avago%20PDFs/ToolKitSelectionGuide.pdf
Lastly, here is the most similar-looking component I've been able to find so far. It has four pins though it is surface-mount:
https://www.vishay.com/ppg?84286
Photos of what I've got:
chip-side:
mysterious "M8aSN":
full assembly of LEDs, chip, components-- this has 6 leads
led pcb sensor identification cmos
asked 4 hours ago
Spencer WilsonSpencer Wilson
162
New contributor
Spencer Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
I'm working to repurpose the trackball assembly of a Logitech Trackman wired mouse for use in an experimental rig. I assumed that Logitech would use Avago's ADNS series of optical flow sensors, but it doesn't appear that way. I've managed to carefully disassemble down to the sensor, but still can't find a part number. One side of the chip reads "M8aSN" but this returned nothing from Google. The sensor assembly had 6 leads running to a PIC, while the sensor itself has four pins.
I'm hoping that some sleuths here might have some ideas. Thanks in advance.
Logitech mouse specs:
https://support.logitech.com/en_us/product/trackman-marble/specs
Avago ADNS series sensors (seemingly not what I'm looking at due to the difference in pin-out) [PDF!]:
http://media.digikey.com/PDF/Data%20Sheets/Avago%20PDFs/ToolKitSelectionGuide.pdf
Lastly, here is the most similar-looking component I've been able to find so far. It has four pins though it is surface-mount:
https://www.vishay.com/ppg?84286
Photos of what I've got:
chip-side:
mysterious "M8aSN":
full assembly of LEDs, chip, components-- this has 6 leads
led pcb sensor identification cmos
led pcb sensor identification cmos
asked 4 hours ago
Spencer WilsonSpencer Wilson
162
New contributor
Spencer Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
Spencer WilsonSpencer Wilson
162
New contributor
Spencer Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
Spencer WilsonSpencer Wilson
162
New contributor
Spencer Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
Spencer WilsonSpencer Wilson
162
asked 4 hours ago
Spencer WilsonSpencer Wilson
162
162
New contributor
Spencer Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Spencer Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Spencer Wilson is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$begingroup$
Do you have schematics of how it was used in the original application?
$endgroup$
– Hearth
4 hours ago
$begingroup$
That photo doesn't appear to be at all similar to Avago ADNS chip.
$endgroup$
– glen_geek
2 hours ago
add a comment |
$begingroup$
Do you have schematics of how it was used in the original application?
$endgroup$
– Hearth
4 hours ago
$begingroup$
That photo doesn't appear to be at all similar to Avago ADNS chip.
$endgroup$
– glen_geek
2 hours ago
$begingroup$
Do you have schematics of how it was used in the original application?
$endgroup$
– Hearth
4 hours ago
$begingroup$
Do you have schematics of how it was used in the original application?
$endgroup$
– Hearth
4 hours ago
$begingroup$
That photo doesn't appear to be at all similar to Avago ADNS chip.
$endgroup$
– glen_geek
2 hours ago
$begingroup$
That photo doesn't appear to be at all similar to Avago ADNS chip.
$endgroup$
– glen_geek
2 hours ago
add a comment |
1 Answer
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I thought those things had become obsolete!
This is more anecdotal than anything, but the Trackball Marble by Logitech was the first to use optical sensors in this way. I actually worked with some of the researchers that designed the first versions of those ICs, some of the historical pedigree is here. The one you found might be more recent versions of the design (and very likely proprietary to Logitech).
The original ICs were actually what is known as analog VLSI (aVLSI) optical flow sensors, these come from the field of Neuromorphic engineering. They do analog calculations based on the optical array that represents the movement of the optical field (loosely based off an insect's eye). This is the original conference paper (PDF download link) from the research team that created it: A CMOS Motion Detector System for Pointing Devices, Xavier Arreguit et.al.
You can see that Figure 1 of the paper very closely resembles the layout of the sensor you found.
According to the 1996 paper, the output of the sensor IC is two 5-bit digital words one for delta-X the other for delta-Y. It only uses 4-pins, two for power one for interface clock, and one for data output.
You should be able to decode the pinout by tracking the signals on the PCB, but it is clear that the large mounting pad in one of the two center pins must be ground.
Although the fundamental idea is similar to what Avago's sensors use, the principle of operation is completely different. Avago's design is fully digital, consisting of a low-resolution camera and digital signal processing circuitry.
answered 3 hours ago
Edgar BrownEdgar Brown
4,2312728
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$begingroup$
I thought those things had become obsolete!
This is more anecdotal than anything, but the Trackball Marble by Logitech was the first to use optical sensors in this way. I actually worked with some of the researchers that designed the first versions of those ICs, some of the historical pedigree is here. The one you found might be more recent versions of the design (and very likely proprietary to Logitech).
The original ICs were actually what is known as analog VLSI (aVLSI) optical flow sensors, these come from the field of Neuromorphic engineering. They do analog calculations based on the optical array that represents the movement of the optical field (loosely based off an insect's eye). This is the original conference paper (PDF download link) from the research team that created it: A CMOS Motion Detector System for Pointing Devices, Xavier Arreguit et.al.
You can see that Figure 1 of the paper very closely resembles the layout of the sensor you found.
According to the 1996 paper, the output of the sensor IC is two 5-bit digital words one for delta-X the other for delta-Y. It only uses 4-pins, two for power one for interface clock, and one for data output.
You should be able to decode the pinout by tracking the signals on the PCB, but it is clear that the large mounting pad in one of the two center pins must be ground.
Although the fundamental idea is similar to what Avago's sensors use, the principle of operation is completely different. Avago's design is fully digital, consisting of a low-resolution camera and digital signal processing circuitry.
answered 3 hours ago
Edgar BrownEdgar Brown
4,2312728
$endgroup$
add a comment |
$begingroup$
I thought those things had become obsolete!
This is more anecdotal than anything, but the Trackball Marble by Logitech was the first to use optical sensors in this way. I actually worked with some of the researchers that designed the first versions of those ICs, some of the historical pedigree is here. The one you found might be more recent versions of the design (and very likely proprietary to Logitech).
The original ICs were actually what is known as analog VLSI (aVLSI) optical flow sensors, these come from the field of Neuromorphic engineering. They do analog calculations based on the optical array that represents the movement of the optical field (loosely based off an insect's eye). This is the original conference paper (PDF download link) from the research team that created it: A CMOS Motion Detector System for Pointing Devices, Xavier Arreguit et.al.
You can see that Figure 1 of the paper very closely resembles the layout of the sensor you found.
According to the 1996 paper, the output of the sensor IC is two 5-bit digital words one for delta-X the other for delta-Y. It only uses 4-pins, two for power one for interface clock, and one for data output.
You should be able to decode the pinout by tracking the signals on the PCB, but it is clear that the large mounting pad in one of the two center pins must be ground.
Although the fundamental idea is similar to what Avago's sensors use, the principle of operation is completely different. Avago's design is fully digital, consisting of a low-resolution camera and digital signal processing circuitry.
answered 3 hours ago
Edgar BrownEdgar Brown
4,2312728
$endgroup$
add a comment |
$begingroup$
I thought those things had become obsolete!
This is more anecdotal than anything, but the Trackball Marble by Logitech was the first to use optical sensors in this way. I actually worked with some of the researchers that designed the first versions of those ICs, some of the historical pedigree is here. The one you found might be more recent versions of the design (and very likely proprietary to Logitech).
The original ICs were actually what is known as analog VLSI (aVLSI) optical flow sensors, these come from the field of Neuromorphic engineering. They do analog calculations based on the optical array that represents the movement of the optical field (loosely based off an insect's eye). This is the original conference paper (PDF download link) from the research team that created it: A CMOS Motion Detector System for Pointing Devices, Xavier Arreguit et.al.
You can see that Figure 1 of the paper very closely resembles the layout of the sensor you found.
According to the 1996 paper, the output of the sensor IC is two 5-bit digital words one for delta-X the other for delta-Y. It only uses 4-pins, two for power one for interface clock, and one for data output.
You should be able to decode the pinout by tracking the signals on the PCB, but it is clear that the large mounting pad in one of the two center pins must be ground.
Although the fundamental idea is similar to what Avago's sensors use, the principle of operation is completely different. Avago's design is fully digital, consisting of a low-resolution camera and digital signal processing circuitry.
answered 3 hours ago
Edgar BrownEdgar Brown
4,2312728
$endgroup$
I thought those things had become obsolete!
This is more anecdotal than anything, but the Trackball Marble by Logitech was the first to use optical sensors in this way. I actually worked with some of the researchers that designed the first versions of those ICs, some of the historical pedigree is here. The one you found might be more recent versions of the design (and very likely proprietary to Logitech).
The original ICs were actually what is known as analog VLSI (aVLSI) optical flow sensors, these come from the field of Neuromorphic engineering. They do analog calculations based on the optical array that represents the movement of the optical field (loosely based off an insect's eye). This is the original conference paper (PDF download link) from the research team that created it: A CMOS Motion Detector System for Pointing Devices, Xavier Arreguit et.al.
You can see that Figure 1 of the paper very closely resembles the layout of the sensor you found.
According to the 1996 paper, the output of the sensor IC is two 5-bit digital words one for delta-X the other for delta-Y. It only uses 4-pins, two for power one for interface clock, and one for data output.
You should be able to decode the pinout by tracking the signals on the PCB, but it is clear that the large mounting pad in one of the two center pins must be ground.
Although the fundamental idea is similar to what Avago's sensors use, the principle of operation is completely different. Avago's design is fully digital, consisting of a low-resolution camera and digital signal processing circuitry.
answered 3 hours ago
Edgar BrownEdgar Brown
4,2312728
edited 1 hour ago
answered 3 hours ago
Edgar BrownEdgar Brown
4,2312728
answered 3 hours ago
Edgar BrownEdgar Brown
4,2312728
answered 3 hours ago
Edgar BrownEdgar Brown
4,2312728
4,2312728
add a comment |
add a comment |
Spencer Wilson is a new contributor. Be nice, and check out our Code of Conduct.
Spencer Wilson is a new contributor. Be nice, and check out our Code of Conduct.
Spencer Wilson is a new contributor. Be nice, and check out our Code of Conduct.
Spencer Wilson is a new contributor. Be nice, and check out our Code of Conduct.
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$begingroup$
Do you have schematics of how it was used in the original application?
$endgroup$
– Hearth
4 hours ago
$begingroup$
That photo doesn't appear to be at all similar to Avago ADNS chip.
$endgroup$
– glen_geek
2 hours ago