About wb0gaz

wb0gaz · 2023-05-28

Looking for English-language datasheet for STM32F400CBT6 MCU.I've attached Chinese-language datasheet (downloaded from jlcpcb.com/lcsc.com) and a link to a selection guide (https://static.stmcu.com.cn/upload/Selection_Guide.pdf) which tells me that t...

wb0gaz · 2022-08-03

Application needs to use all three (in STM32G431) op amps as inverting PGA handling ac-coupled signals. As there's no internal option to supply mid-point (VREF/2 with a decoupling cap at the device pin) to the non-inverting inputs of the (3) op amps ...

wb0gaz · 2022-06-30

Problem type - ADC readings excess uncertainty when reading internal reference (channel 17) - got to this point after excess ADC reading uncertainty on device pins, trying to isolate cause.Hardware Details - small 2-layer board (about the size of a L...

wb0gaz · 2022-04-16

I am trying to set up ADC1 on STM32F103C6 "bare metal" (no HAL or LL). I've successfully done this on F0 series without difficulty, but this has me stumped. I've also referred to source code generated by STM32CubeMX (for just this device on this targ...

wb0gaz · 2022-04-15

I was setting up pin assignments for a project and encountered a conflict between datasheet and reference manual. Can this be resolved?The datasheet for STM32F103x4 STM32F103x6, filename stm32f103t4.pdf, dated 6/1/2015 9:41:55 AM appears to lack an e...

wb0gaz · 2023-05-28

Thanks! I compared tables (not narrative) between it and STM32F410CBT6 datasheet (the part I'm interested in substituting with STM32F400CBT6) and didn't see any differences so far. For my purpose, I suspect so far it is a usable alternative (I don't ...

wb0gaz · 2022-08-03

Inverting is not required on it's own, but I think it's necessary to accomplish a PGA that doesn't also apply gain to the DC offset (mid-point - VREF+/2) necessary to handle an AC signal.In the case of inverting PGA, I'd bias the non-inverting inputs...

wb0gaz · 2022-08-03

Thanks - that's helpful for sure. Here's a "for extra credit" problem - LQFP48 package is very pin constrained for this application (and I can't go to LQFP64 or 100). Can you think of any way I could configure all three op amp non-inverting inputs to...

wb0gaz · 2022-07-14

The definitive answer to this was found in RM0008 Rev 21, page 186, section 9.4.2, about AF remap:For AFIO_MAPR, Bit 0 (SPI1_REMAP), the authoritative text is:Bit 0 SPI1_REMAP: SPI1 remappingThis bit is set and cleared by software. It controls the ma...

wb0gaz · 2022-06-30

Considerable progress - added 27 uH 0805 inductor in series between VDD_1/2/3 and VDDA, modest improvement in distribution of the samples was seen. Then changed the decoupling cap between VDDA and ground from 0.1 uF to 10 uF (ceramic 0805 6.3V) and s...

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STM32F400CBT6 - looking for (english) datasheet

STM32G4 op amps (>1) as inverting PGA with mid-point bias applied to non-inverting inputs - tie non-inverting inputs together?

STM32F103 (stand-alone, not on "blue pill" board) - ADC uncertainty when reading internal reference (channel 17)?

Problem setting up ADC1 on STM32F103C6 to do single programmed read (of Vrefint) - bare metal

Is this an error in datasheet DocID15060 Rev 7 (STM32F103x4 STM32F103x6) - regarding SPI1_SCK when SPI_REMAP = 1.

Re: STM32F400CBT6 - looking for (english) datasheet

Re: STM32G4 op amps (>1) as inverting PGA with mid-point bias applied to non-inverting inputs - tie non-inverting inputs together?

Re: STM32G4 op amps (>1) as inverting PGA with mid-point bias applied to non-inverting inputs - tie non-inverting inputs together?

Re: Is this an error in datasheet DocID15060 Rev 7 (STM32F103x4 STM32F103x6) - regarding SPI1_SCK when SPI_REMAP = 1.

Re: STM32F103 (stand-alone, not on "blue pill" board) - ADC uncertainty when reading internal reference (channel 17)?