About OLewi.1

OLewi.1 · 2022-03-16

We've just changed the way our system is powered: Previously the accelerometer was powered from a 1.8V regulator, now it's powered directly from a 3V coin cell (schematic part attached).With the change, we have started to observe a strange ramping wh...

OLewi.1 · 2020-03-10

Hi,We're using an STM32L47xx which connects to a number of other peripherals. On our first board spin, we can see the device enter bootloader mode. We weren't aware of the bootloader addition, so it wasn't accounted for during the early design phases...

OLewi.1 · 2022-03-25

That would really surprise me. Vdd is common across parts and is always the logic level for all digital I/O - that was the same with and without the regulator. I would expect the digital switch level to change automatically as Vdd changes. CS is also...

OLewi.1 · 2022-03-25

Hi Eleon, and thanks for your reply. After a few days with a scope I figured it out: It turns out the SPI data lines were left floating in-between toggling the CS - this was the cause of the funny ramp. The solution was simple, when CS is idle, chang...

OLewi.1 · 2020-03-10

Hi Andreas,Yeah, that was my question about needing a physical button (or jumper) to keep the device in reset until it can be programmed. I think, if we need to redesign the board, then we will just avoid using the BL pins altogether.I was wondering ...

OLewi.1 · 2020-03-10

Hi Danish, Thanks for the suggestion. Wow, that's a pain. I'll forward that onto the H/W guys here, I suspect there will be some choice language when they read that. I'm not sure we have a ZIF socket for that size of chip either.Thanks.

OLewi.1 · 2020-03-10

Yes, meant to correct that, the full chip variant is STM32L4S7ZIT6.An2606 does detail the pins that change when entering bootloader mode and the patterns that are required to get it into bootloader mode. Apparently using the "unprogrammed" state as p...

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Observing strange voltage ramp when VDD is above 2V - LSM6SOTR

How to disable bootloader in unprogrammed device?

Re: Observing strange voltage ramp when VDD is above 2V - LSM6SOTR

Re: Observing strange voltage ramp when VDD is above 2V - LSM6SOTR

Re: How to disable bootloader in unprogrammed device?

Re: How to disable bootloader in unprogrammed device?

Re: How to disable bootloader in unprogrammed device?