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Is the ADUM6404 VDDL pin ..wrong voltage #4
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You are right. The ADUM Data Channels in this configuration work with 5V. I was thinking the gpio pins on the pi are 5V tolerant but in fact they are not. But for your workaround check the ADUM Datasheet:
This is not the case if you use 3.3V on the VDDL Pin. To be safe use a Voltage Divider for CF1, CF2, IRQ1 and IRQ2 if you realy need those pins. i havent used any of these right now. greetings and thanks for the input |
Sorry, but I think AD devices means with the same voltage source..the same voltage group... at the same side of the chip. According to the datasheet VDD1 (5V) with GND1 and with the 3V3 must also have GND1 as ground. |
No I am using your basic design and mixed with the original evaluation board...so not the current headphone connectors, also the rogowski components are back, Aswell a raspberry as a ESP32 (D4 micro) can be connected and a GPS (tx,rx,pps). koen |
Okay thanks for the info. I will fix this soon and close the issue when i am done |
I think the PCB has a wrong connection at the ADUM6404 VDDL pin.
Now it is connected to the +5V_ISO..so the output of the ADUM6404 VOA..VOD is between 0 and 5 V, that's bad for the raspberry.
When I connect the VDDL pin of the ADUM6404 at +3V3_ISO the logic levels are normal between 0 and 3.3V. ...I tested this and this was correct.
greetings
Koen
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