About BHell.1

BHell.1 · 2023-05-24

1)STM32H745I-DISCO, the bus is 16bit and the memory is 32bit. In the spec there is 128M-bit SDRAM.Question is if full memory 1(28M-bit) is available for usage on this kit?2) If answer is yes on first question. We can only access half of the memory an...

BHell.1 · 2023-03-28

HelloI'm using Abracon 25MHz( ABM11W) crystal for HSE clock on STM32H750.CL1 and CL2 are set to 12pF after some calculations. And it works on the prototype.Question is regarding the resistor do reduce/control driving level to this crystal. I have bee...

BHell.1 · 2023-02-20

I have seen an example to create 5v tolerant input on STM32H750, a resistor divider controlled by GPIO. Now I can't find find it when I need it...anyone seen this example and maybe can point it out? I suppose I need a buffer in front to avoind impeda...

BHell.1 · 2023-02-07

I'm using STM32MX Cube to assign pins for different features.I have a lot of communication ports and GPIO:s enabled in my STM32H750.I have prototype 1 working, I noticed that when I add for instance an extra I2C other pins move without notice. For in...

BHell.1 · 2022-10-24

Need your advice. PCB routing. I have Divided signals into 4 groups + (CLK) : 1: Address: SDRAM_BA[0-1]/SDRAM_A[0-11] 2: Command: SDNRAS/SDNCAS/SDNWE 3: Control: NE0/CKE0/NBL[0-1] 4: Data: SDRAM_D[0-7] ( sub goup1 ) & [8-15] ( sub group 2) 5: SD...

BHell.1 · 2023-02-07

ok, thanks.That was the setting I was looking for:-)Have a great day!

BHell.1 · 2022-10-11

Thank you! Great.

BHell.1 · 2022-10-08

Hello eewizThank you. I fully agree.Have a nice day.

BHell.1 · 2022-10-06

Hello eewiz,I fully agree wíth you.What is your oppinion to connect gpio on STM32 into a enable pin on a chip, normally it is a op:amp input and the current is approx. 40nA from this pin. I have added a 10K pull down to keep the level to low when SM3...

BHell.1 · 2022-09-28

Hello Tesla Thanks, yes I have USB but no Ethernet or CAN.I have done the math and my conclusion is that the CL needs to be below or equal to 10pF, should be 6-8 for a better margin since the trance will add xpF. Problem is still the stock.

User statistics

User Activity

FMC: How to get full memory access on a 32 bit SDRAM via 16 bit data bus?

High-speed external (HSE) clock via external 25MHz Abracon crystal. What is a suitable value for the external resistor (Rext.) ?

is tehre any simple way to create 5v tolerant ADC input on STM32H750?

STM32MX Cube pins are changing without a notice!

STM32H750 and SDRAM signal groups

Re: STM32MX Cube pins are changing without a notice!

Re: On ref-design mc1381 I have noticed that there are serial resistors on every single lane SDRAM D & A bus, 33ohm resistors. eMMC Data lines, 22ohms serial resistors. Is the argument for the resistors to reduce "ringing" in lane ?

Re: STM32H750XBH6 What is the resistiance of a GPIO pin when the device is shut down = 0V to STM32 ? The pin is config. to be an output pin( push-pull) when the device has power.

Re: STM32H750XBH6 What is the resistiance of a GPIO pin when the device is shut down = 0V to STM32 ? The pin is config. to be an output pin( push-pull) when the device has power.

Re: STM32H750XBH6 HSE Crystal