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6-layer stack confirmation
meslomp wrote: With multi layered boards ( specially over 4 layers) you need to select a manufacturer and go with them. You can then after you have made a layer plan just go to...
Monday, 1 July 2019 - 08:14
6-layer stack confirmation
All very valid questions and points, thanks again for your input.   I'm not looking to eliminate coupling altogether, as you've mentioned that's not the aim of increasing the...
Monday, 1 July 2019 - 00:37
6-layer stack confirmation
Thanks for the responses guys. The need for 3 signal layers is due to density; the previous version of the board was on a 4-layer, but I've since increased the component count and...
Sunday, 30 June 2019 - 19:51
MCU ADC input when MCU powered down
Thanks again for your input, it's greatly appreciated.   I should have been more specific; I am using a micropower regulator for the VBatt_3V3 rail, so power loss should be...
Monday, 24 June 2019 - 23:42
MCU ADC input when MCU powered down
I was implementing the above design in my schematics last night, and realised I've actually got another similar circuit which will need some attention.   I have a RTC IC...
Monday, 24 June 2019 - 22:32
MCU ADC input when MCU powered down
Thanks for that, I had figured a pull down would make sense to avoid floating. As for Q1 I'm not sure, as mentioned above I've borrowed this schematic from a StackOverflow post :D
Monday, 24 June 2019 - 07:49
MCU ADC input when MCU powered down
Brilliant, thanks again for your help. The battery in question is indeed a fairly sizeable lead-acid, I'm really not worried about microamps of leakage at this point.   I'll...
Monday, 24 June 2019 - 04:03
MCU ADC input when MCU powered down
I came across this solution on a similar post, does this look ok? I would obviously vary the output voltage divider to suit, I'm more interested in the NFET-PFET combination....
Monday, 24 June 2019 - 01:24
MCU ADC input when MCU powered down
Thanks for that avrcandies, a FET certainly seems like the way to go.   This is a 3V3 system, so I'll have to do some calculations as to the correct NFET given the VBatt...
Monday, 24 June 2019 - 01:02
ATSAME70Q21 Dual Serial 2-Wire within QSPI
I ended up coming to that very conclusion Kartman, I'm just going to stick with regular SPI and see how I go.
Tuesday, 14 May 2019 - 22:00
ATSAME70Q21 Dual Serial 2-Wire within QSPI
I've done a little more reading into this option. Each of the ADCs actually has 3 data lines, 2 outputs (which carry the conversion data) and one input (which carries register...
Sunday, 28 April 2019 - 08:30
16-channel 12V PWM output circuit
That all makes sense, thanks again for your help. The maximum switching frequency of the PCA9685 is ~1.5kHz, so I don't need rapid switching capability by any means.
Sunday, 10 March 2019 - 20:15

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