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volt.tech Latest Questions

vikas Nagpal
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vikas Nagpal
Asked: February 6, 2023In: Wireless Connectivity

Why ESP-32 Can Still Work after the Capacitor of the Crystal Oscillator?

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Hello, In the average assignments, the software controller chip outputs a high and low-level signal with a frequency of 100HZ at GPIO5. When we suddenly- circuit the load capacitance of the 40 MHz crystal oscillator, the output signal of GPIO5 changes ...Read more

Hello,

In the average assignments, the software controller chip outputs a high and low-level signal with a frequency of 100HZ at GPIO5. When we suddenly- circuit the load capacitance of the 40 MHz crystal oscillator, the output signal of GPIO5 changes to a signal of 10HZ- 20HZ, and the CPU seems to be working at a reduced frequency. What’s the reason? Why can the CPU still work?

I really appreciate any help you can provide.

Read less
capacitorcontrollercrystalesp32gpio5oscillatorsoftware
  1. Alex thomas
    Added an answer on February 7, 2023 at 10:03 am

    Hello, Yeah, do not do that, it runs the ESP out of specs and we can not guarantee anything wrt how it works in that case. For an explanation, I am just guessing then, but the CPU runs off the internal PLL. While that PLL uses the Xtal as a reference, it has its own VCO that gets tuned to run in synRead more

    Hello, Yeah, do not do that, it runs the ESP out of specs and we can not guarantee anything wrt how it works in that case. For an explanation, I am just guessing then, but the CPU runs off the internal PLL. While that PLL uses the Xtal as a reference, it has its own VCO that gets tuned to run in sync with the xtal frequency. Could be that shorting the xtal makes the VCO still run, but not veritably stably, and at the lowest frequency it happens to be suitable to reach, and that is what you see.

    Thank You

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  • 1 Answer
Answer
ashishgawade
  • 0
ashishgawade
Asked: January 12, 2023In: Wireless Connectivity

How to Check EMC in Test Mode for the Certification Process?

  • 0

Hi We’ve to get our hardware certified in a number of different countries. And to meet the certification process the ESP software will need to configure our hardware to different functional countries as there are a number of software-controlled DC/ DC ...Read more

Hi

We’ve to get our hardware certified in a number of different countries. And to meet the certification process the ESP software will need to configure our hardware to different functional countries as there are a number of software-controlled DC/ DC inventories on the hardware.

The challenge is that Espressif just supplies the FCC test software as a binary. I’ve communicated with Espressif to know if I can get the source code or in the binary library so that I can incorporate it into our test code, and they replied that won’t supply the code.

Does anyone know how to put the ESP32 into the needed modes for the certification process?

Regards

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certificationemcespesp32espressiffccsoftware
  1. Alex thomas
    Added an answer on January 17, 2023 at 10:26 am

    Hi, Do all possible noise sources have to be enabled during purposeful radiator testing or just those directly coupled to the antenna? Obviously, there is some possibility of dealings between purposeful and unintentional radiator sources. This is how we get stuff like FCC complete modular instrumentRead more

    Hi, Do all possible noise sources have to be enabled during purposeful radiator testing or just those directly coupled to the antenna? Obviously, there is some possibility of dealings between purposeful and unintentional radiator sources. This is how we get stuff like FCC complete modular instrument taking rf shielding and internal regulation. The unintentional radiator sources would be tested independently with purposeful radiators powered off. This may be different from other official authorities.

    Obviously, espressif should give some support similar to allowing gpio control or Lua/upython scripting in the test binary or releasing a library that can be incorporated into IDF designs. perhaps too important fear of CW mode being turned into a jammer? At least it should be available under NDA and usage agreement.

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crmnext
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crmnext
Asked: November 20, 2022In: Power Management

How to Get Good VNQ660SPTR- E?

  • 0

Hello dears, we bought months ago VNQ660SPTR– E on official suppliers similar to Digikey, Mouser, and Arrow, but the lead time is long due and we still haven’t received the goods. We want to know if the factory is still producing ...Read more

Hello dears, we bought months ago VNQ660SPTR– E on official suppliers similar to Digikey, Mouser, and Arrow, but the lead time is long due and we still haven’t received the goods.

We want to know if the factory is still producing this product.

Best Regards,

Read less
software
  1. vikas Nagpal
    Added an answer on November 24, 2022 at 9:56 am

    Hii, More precisely, the NRND note expresses that the component in question will be discontinued eventually soon and is a recommendation that users should switch their system to an alternative device. The time period until the final discontinuation isn't defined, the component will surely continue tRead more

    Hii,

    More precisely, the NRND note expresses that the component in question will be discontinued eventually soon and is a recommendation that users should switch their system to an alternative device. The time period until the final discontinuation isn’t defined, the component will surely continue to be produced until the discontinuation.

    Regards
    /Vikas

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