About gviereck

gviereck · 2024-06-18

Hi all,I have noticed a difference between LAN8742 datasheet and the circuit on STM32F746 Discovery board.This is an extract of the schematics of the demo board:The pull-ups R90 to R93 are directly connected to "3V3"whereas in the LAN8742 datasheet (...

gviereck · 2023-11-13

We use a STM32F7xx microcontroller with LQFP144 casePart of the ADC Pins are on the 1-36 pin side.Unfortunately this is also the side where the Quartz (Pins OSC_IN and OUT, PC14-OSC32_IN, PC15-OSC32_OUT) and the RMII_CLK are mapped.This leads to add...

gviereck · 2024-06-25

Thanks !The Ferrite is merely here to protect the power supply and prevent Ethernet PHY lines to pollute the rest of the board

gviereck · 2024-06-18

We have changed the ADC-channels. The 2 ADC channels too close to the RMII clock: one is no longer used and we found an available ADC-pin further away, the other one is used for a signal that is less sensitive to noise (motor turn pulse).The noise is...

gviereck · 2023-11-15

Hello AScha.3,Thanks for your contribution that makes sense.Some more details about our HW and FW implementation:1) STM32F756 has 3 ADC's with 12bit resolution.=> 1 LSB corresponds then to 0.8 mV2) Within our actual FW the sampling frequency is 10 kH...

gviereck · 2023-11-14

Thanks for you contribution.I wish, you were right.But the fact is that the sensor tracks do not cross or go along high speed signals. Moreover, we have a several layer PCB among which are analog and digital ground planes and supplied voltage (e.g. +...

gviereck · 2023-11-14

Yes.I measured the noise without anything connected to the input stage composed of anti-aliasing filter and voltage adaption circuit.

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missing star conx to +3.3V through ferrite between LAN8742 and RJ45 on STM32F746 Discovery board

ADC Noise

Re: missing star conx to +3.3V through ferrite between LAN8742 and RJ45 on STM32F746 Discovery board

Re: ADC Noise

Re: ADC Noise

Re: ADC Noise

Re: ADC Noise