| ??? 07/25/06 12:12 Read: times |
#121019 - a much more elaborate protection scheme must be im Responding to: ???'s previous message |
When I tested the proto boards I was surprised to see that the digital supply was measuring 5.5V instead of 3.3V. Investigating in detail revealed that the RTD wasnt connected across the input so the RTD AMP output was full swing output 13V. Since the only thing in between this 13V output from Amp amd my 3.3V was the schottkey which could hardly resist current flow the micro Vcc got risen.
1) right now this Alzheimers patient can not remember what a RTD is, and maybe others can not either, when using such abbreviations, please say what it is. 2) the 'protection scheme' when connecting somethinh capable of (not 'outputting') that high a voltage a much more elaborate protection scheme must be implememted. A resistor divider comes to mind. Erik |
| Topic | Author | Date |
| Reistor in series in signal from Amp to ADC. | 01/01/70 00:00 | |
| You forgot the other Question | 01/01/70 00:00 | |
| Read the app notes | 01/01/70 00:00 | |
| What ADC? What application? | 01/01/70 00:00 | |
| Re: Application. | 01/01/70 00:00 | |
| That's not good | 01/01/70 00:00 | |
| a much more elaborate protection scheme must be im | 01/01/70 00:00 | |
| Re: RTD & high voltage output. | 01/01/70 00:00 | |
| what about a zener across the RTD? | 01/01/70 00:00 | |
| Some questions | 01/01/70 00:00 | |
| ADC details? | 01/01/70 00:00 | |
| datasheet does not contain because | 01/01/70 00:00 | |
| ADC details still missing! | 01/01/70 00:00 | |
| Yes ADC details Missing,. | 01/01/70 00:00 | |
| That's what we need the details for... | 01/01/70 00:00 | |
| what detail? | 01/01/70 00:00 | |
| Analog input circuitry and timing diagram | 01/01/70 00:00 | |
| Forum Power. | 01/01/70 00:00 | |
| Link? | 01/01/70 00:00 | |
| Re Link. | 01/01/70 00:00 | |
| if you use them, sign up | 01/01/70 00:00 | |
Thanks | 01/01/70 00:00 |