About okeskin_mak

okeskin_mak · 2022-11-29

Hello.I am using a supercap as rtc backup battery on my STM32G4 processor. There is a bit of high consumption as I drive the RTC crystal high. But the highest consumed current is 0.8uA.The product I chose is SCMS22D255PRBB0. However, it discharges qu...

okeskin_mak · 2022-10-13

Hi,I am using a crystal from AN2867 (ECX-.327-CDX-1293). I'm having trouble starting LSE on stm32g474 mcu.When I calculate gain Margin, I reach 1.24. The expression in the application note also tells us to be careful that the oscillator transconducta...

okeskin_mak · 2022-11-29

Of course, first of all, I used cubemx during the design and it showed me 1.05uA consumption. Isn't it abnormal to run out of 2.5F supercapacity in 2 days even with this consumption value?I have no problem with the current consumed by the MCU. Do you...

okeskin_mak · 2022-10-14

Hi Peter,You're right about the GND plane, I'll have to change it. However, we produced dozens of cards for prototype production. I'm having some startup issues.Also, my pcb doesn't even have a via. It uses via and jumper in Nucleo kit but still ok??...

okeskin_mak · 2022-10-14

Hi JW,I understand what you're saying. Only one issue that I did not specify, the startup problem does not exist on all pcbs. Some products start directly without problems. Initially I tried with LSE low drive. Then none of them worked. When I tried ...

okeskin_mak · 2022-10-14

Hi JW,I checked the nucleo. It uses the NX3215SA crystal. I also looked at the layouts. transported by jumpers and vias. Even the parasitic effect of vias is not on my card. The point I got stuck on is using 5.1pf capacity for a crystal with 6pf load...

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Supercup selection and estimated lifetime calculation for RTC.

LSE Gain margin

Re: Supercup selection and estimated lifetime calculation for RTC.

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Re: LSE Gain margin