About andrew sauter

andrew sauter · 2024-03-29

We have a new revision that has a significant population of boards with this intermittent power issue. steps to reproducepress power buttonpower applied to the MCU the MCU only prints a single debug message, then haltspress reset: device works normal...

andrew sauter · 2017-06-08

Posted on June 09, 2017 at 05:47We are seeing some of our opamps failing, outputting the VCC rail regardless of input!The input signal is a BLDC fan current sense resistor and cell a is a non-inverting gain of 3x.Our sleep circuit was implemented in...

andrew sauter · 2024-04-10

AN2867 is great, I will also be performing the gain margin test, by adding 5x the crystal ESR and verifying it still works, also https://resources.altium.com/p/making-most-your-crystal-oscillator It appears we have two MCUs that are outliers in that ...

andrew sauter · 2024-04-07

These boards are built with this crystal Raltron 32 kHz 12.5 pFLayout: there is a continuous return on adjacent to the top and bottom side, but we change reference as it goes from top to bottom layer (no transitional via) there are two series elemen...

andrew sauter · 2024-04-07

We created a test FW to measure the RTC startup time and the median was 1.5sec and the repeatability was mostly +/- 20% . However, two assemblies were over five seconds, I have tracked the issue to the MCU!the capacitors measured correctlyreplacing d...

andrew sauter · 2024-04-02

Our device has a power switch so our MCU has no power until it is turned on.

andrew sauter · 2024-04-01

Hello All, Boot0 is low, VCAP is stable, VDD and VSS are solid, our bypass values are 1uF per pin 0603, also we have a bulk 22 uF ceramic, we are using internal RC for clock and external 32 kHz crystal for RTC RTC is implicated as causeif I force the...

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STM32F401RCT6 requires a reset to run code

Can under-powering an OpAmp Damage it (TSV358AIDT)

Re: STM32F401RCT6 requires a reset to run code

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Re: STM32F401RCT6 requires a reset to run code

Re: STM32F401RCT6 requires a reset to run code

Re: STM32F401RCT6 requires a reset to run code