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Home/datasheet

volt.tech Latest Questions

vikas Nagpal
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vikas Nagpal
Asked: March 6, 2023In: LEDs & Optoelectronics

STM32WB55 IR DA Hardware Setup?

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Hello, After looking over all the documentation I could find (datasheet, source primer, etc.), I couldn’t easily find how I’m meant to connect IR LED (s) for Ir DA communication with an STM32WB55. The image I attached is a screenshot from ...Read more

Hello,

After looking over all the documentation I could find (datasheet, source primer, etc.), I couldn’t easily find how I’m meant to connect IR LED (s) for Ir DA communication with an STM32WB55. The image I attached is a screenshot from the reference primer, which implies that there may be IrDA_OUT and, IN pins (I am interpreting this as being separate from the TX and RX pins). Am I supposed to add some intermediate IC for Ir DA, or can the STM32WB55 actually output signals for driving/ reading IR LEDs photodiodes?

I am aware of the actuality of the IR_OUT pins, but that’s its own separate thing. In the IR_OUT documentation, they use only timers (TIM16 & TIM17), not the US ART supplemental.

Thanks and Regards

Read less
datasheethardwareirdaledsphotodiodesstm32wb55
  1. Julian White
    Added an answer on March 7, 2023 at 10:27 am

    Hello, IrDA has hardly been used for a long time, which is also marked in discontinued IrDA transceivers. However, since basically everything except the TIA and visual factors is included in the STM32 IrDA SIR ENDEC, it's possible to recreate IrDA with an IR LED plus driver transistor and an IR photRead more

    Hello,

    IrDA has hardly been used for a long time, which is also marked in discontinued IrDA transceivers. However, since basically everything except the TIA and visual factors is included in the STM32 IrDA SIR ENDEC, it’s possible to recreate IrDA with

    • an IR LED plus driver transistor and
    • an IR photodiode plus TIA.

    RX and TX are switched to the IrDA function so that the LED driver and TIA can be connected directly.

    Regards

    Julian White

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  • 1 Answer
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cleaneatzkitchen
  • 0
cleaneatzkitchen
Asked: November 8, 2022In: Wireless Connectivity

How to use LED Control PWM in low speed mode?

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Hi! I’m applying the LED Control (LEDC) PWM to control the servo motor, it worked well. And now I need to control further than 8, I’ve checked the ESP32 datasheet, and there have 16 channels can use 8 in High – ...Read more

Hi!

I’m applying the LED Control (LEDC) PWM to control the servo motor, it worked well.
And now I need to control further than 8, I’ve checked the ESP32 datasheet, and there have 16 channels can use 8 in High – speed mode, and 8 in Low – speed mode.
But the ledc library does not support low- speed mode right now, is there any way to use led pwn in low- speed mode?
Like, write the register directly?

thanks!

Read less
datasheetespesp32espressifledledcuart
  1. Alex thomas
    Added an answer on November 11, 2022 at 12:21 pm

    Not sure if the driver does not support all 16 channels. they may just not be supporting the low- speed option of the low- speed channels. But anyway, if you want to poke at the registers yourself, the LED PWM controller is documented in the TRM. Do not forget to actually turn the peripheral on, andRead more

    Not sure if the driver does not support all 16 channels. they may just not be supporting the low- speed option of the low- speed channels. But anyway, if you want to poke at the registers yourself, the LED PWM controller is documented in the TRM. Do not forget to actually turn the peripheral on, and you should get it going enough quickly.

     

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  • 1 Answer
Answer
Alex thomas
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Alex thomas
Asked: September 12, 2022In: Power Management

STLQ020PUR Output Discharge Function?

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Hello, I’m interesting in STLQ020PUR WITHOUT the output discharge function( offered as an option) there’s no data in the datasheet to recognize if this option is present or not versus the device reference STLQ020PUR how to be sure that the provided ...Read more

Hello,

I’m interesting in STLQ020PUR WITHOUT the output discharge function( offered as an option) there’s no data in the datasheet to recognize if this option is present or not versus the device reference STLQ020PUR how to be sure that the provided device has no discharge function?

Thanks

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datasheetdischargemanagementpowerstlq020pur
  1. nidhi singh
    Added an answer on September 19, 2022 at 12:52 pm

    The STLQ020PUR (flexible version) doesn't contain the discharge function. You can also find reference 2 in the data sheet, table 5, stating Rlow is( available)" on specific version only". In those specific versions( not released to the request yet) Rlow would be equivalent to the on- resistance of tRead more

    The STLQ020PUR (flexible version) doesn’t contain the discharge function. You can also find reference 2 in the data sheet, table 5, stating Rlow is( available)” on specific version only“. In those specific versions( not released to the request yet) Rlow would be equivalent to the on- resistance of that switching FET marked with an asterisk visible infig. 2.

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  • 1 Answer
Answer

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