| ??? 04/21/07 22:50 Modified: 04/21/07 22:53 Read: times |
#137742 - Spare ADC and DAC on your micro? Responding to: ???'s previous message |
Oh... another Idea. Concept only.
Assume DAC can swing 0 to 5v but set for output 2.5v Connect a 10k resistor between the DAC output and ADC input (the probe point is defined as the ADC input). The ADC voltage (proble voltage) will indicate the logic state of the probe point. If probe voltage >0v and <0.6v then Logic 0 If probe voltage >2.4v and <5.5 then logic 1 If probe voltage >0.6v and <2.4v then Hi-Z If probe voltage <0 then ERROR IF probe voltage >5.5v then ERROR Joe |
| Topic | Author | Date |
| tri state input reading | 01/01/70 00:00 | |
| tri-state | 01/01/70 00:00 | |
| Reading TriState | 01/01/70 00:00 | |
| Hi-Z reading | 01/01/70 00:00 | |
| Logic Probe Concept | 01/01/70 00:00 | |
| Window Comparator | 01/01/70 00:00 | |
| Build Or Buy | 01/01/70 00:00 | |
| Using Analogue Methods to test for Hi-Z | 01/01/70 00:00 | |
| Spare ADC and DAC on your micro? | 01/01/70 00:00 | |
| search found | 01/01/70 00:00 | |
| Some mistake | 01/01/70 00:00 | |
| 100k resistor | 01/01/70 00:00 | |
| An idea... | 01/01/70 00:00 | |
| Fundamental Logic and Hi-Z impedance | 01/01/70 00:00 | |
| Some thoughts on the tristate detection | 01/01/70 00:00 | |
| not 'the first', but THE problem | 01/01/70 00:00 | |
| Heisenberg | 01/01/70 00:00 | |
agreed | 01/01/70 00:00 | |
| thank you | 01/01/70 00:00 |