Timeline for MCP23017 connection to CD74HC4067 through Diode
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 18, 2018 at 5:19 | comment | added | sizzle | Thanks for your help! Found the issue after drawing out the circuit. | |
| Aug 18, 2018 at 5:15 | vote | accept | sizzle | ||
| Aug 18, 2018 at 4:32 | comment | added | Spehro 'speff' Pefhany | Nothing you said there has changed my guess. Is there a 10K on the input or output of the HC4067? | |
| Aug 18, 2018 at 4:23 | comment | added | sizzle | Whoops, not Zener diode, just rectifier diode. When I disconnect the MCP23017 pin from the diode and measure it's output, I see 5V. When I connect the anode of the diode directly to VDD I see the 4.3V on the output of the HC4067. When I mate the two, I get the strange 1.45V out of the HC4067. I will create a circuit diagram. | |
| Aug 18, 2018 at 4:14 | history | answered | Spehro 'speff' Pefhany | CC BY-SA 4.0 |