Can I have access to the datasheet for the sensor used in the Microsoft Intellimouse Pro?

Jason 1 Reputation point
2020-12-31T01:06:13.587+00:00

Hi,

I'm not sure if this is the right forum for this but I couldn't find a better fit.
TL;DR: Can I get access to the Pixart PAW3389-MS (the sensor used in the intellimouse pro) datasheet?

Some background: The optical sensor used in the intellimouse pulse width modulates power to its on-chip IR LED which produces an audible whine. I am trying to silence this whine. The sensor (PAW3389-MS) does not have a datasheet but the PMW3389DM does. The PMW3389DM has a register that controls the PWM frequency (0x73) so I guessed the PAW3389-MS does as well. The intellimouse has a microcontroller to interface with the sensor over SPI and the host PC over USB. I amended the stock firmware to perform an additional write operation to the appropriate register over SPI. I used a scope to confirm that my firmware patch is working. The trouble is that the PWM frequency isn't changing. I'm guessing the additional register write is not sending a valid value (I tried 0xEE, 0x01, 0x10, and 0x20) or the register can only be written to when the sensor is in a particular state. Perhaps the register isn't even there. In any case, the public PMW3389DM datasheet is inadequate. I decided to contact Pixart to get more info, but they can't send me the PAW3389-MS datasheet because they are under MNDA with Microsoft. Can Microsoft send me this datasheet? If not can I just have information about whether a PWM frequency register exists and if so how to write to it properly?

Thanks, Jason

Windows Hardware Performance
Windows Hardware Performance
Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.Hardware Performance: Delivering / providing hardware or hardware systems or adjusting / adapting hardware or hardware systems.
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  1. Cymon Kilmer -MSFT 801 Reputation points
    2021-01-08T22:24:20.3+00:00

    Hey Jason,
    I reached out to the feature team and the response is that the datasheet can't be shared. The team did note that they haven't found any audible noise issue with the product.