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Hi all,
I am using AP63205 DCDC buck converter to generate 5V from a 12V input.
I measured 12V input and the output is 4.96V at the output under no load.
I have a 5R load ( wire wound resistor 5R 50W).
When I connect this why am I only seeing 450mA drawn from the output (I am measuring this...
I can see that a stronger pull up will keep the Boot0 pin below 0.43V. But when the FTDi is toggling, i.e. Internal pull up 66K. This does not then go above 1.26V. Forming a potential divider with the 6.6K. Am I missing something?
Ok, I understand. I was mis interpreting the ViH value. So the remedy is to have the pull down decreased to allow the Boot0 voltage to be less than 0.43V. Also when toggled it needs to be greater than 1.26V. The recommendation was to have it at 6.6K?
The 10K should have the BOOT0 pin at 0V, then the FTDi device toggles this line high. This should then get into system memory bootloader. However the voltage is at 0.5V. The Minimum level that the BOOT0 of the STM32 (ViH) should be 0.17VDD + 0.7V which is 1.26V.
The Boot0 is at 0.5V, when...
This is where I got the 1.26V for ViH.
1697837160
The pull down is to keep the BOOT 0 pin at 0V, then switched to logic 1 via the FTDi. This has the effect of accessing the bootloader in system memory.
Do you not add the 0.7V, this is what I did?
1697806308
Do I not need the ViH of the STM32? Not the FTDi?
1697806456
Ask we are putting the STM32 into Boot mode?
Hi,
The Boot0 is at 0V via the 10K. However, it's when try entering the Bootloader by switching it via the FTDi device. The voltage jumps to 0.5V, which is nowhere close to the ViH of the STM32, minimum is around 1.25V.
We scoped this too. But at 0.5V some units enter bootloader? I can't...
We are toggling from 0 to 1. To get into bootloader mode. However it sometimes enters this state when the Boot0 is at 0.5V. Which is confusing. With the 100K pull down it works all the time.
1697788622
We have the pull down but need to toggle Boot0 to a logic 1 to get into the system memory...
Hi all,
We are trying to use a FT230x CBUS3 to control the BOOT status of a STM32F215.
The boot pin of the STM32 is tied to 0V via a 10K pull down.
The internal pull up of the FT device is used to toggle the boot pin. I have attached a diagram.
We are seeing a voltage of 0.5V which does not...
My other question was the selection parameters for the TVS diode. The CC1 and CC2 signals can be anywhere between 3V to 5.5V.
The TVS diodes that I am looking at have a reverse standoff voltage of 5.5V.
This ideally should be higher than the signal level that requires protection. Is this...
Hi all,
I have attached a picture showing 2 different methods of using bidirectional TVS diodes to protect the CC1 pin of a USB C connector. Note I have the same for CC2.
I am not sure which one is better suited for this application.
Also why are the diodes facing differently on the two...
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