| ??? 10/01/10 05:44 Read: times |
#178814 - That's one of the sheets I sent him Responding to: ???'s previous message |
What he's got is a remote V2F converter that provides the input data, and what he needs for output is an appropriately scaled output voltage and a display that reflects that voltage, albeit in 10 discrete bands.
More specifically, he wants to receive his voltage information, determine where within the desired range it falls, and produce an output voltage that reflects (and i could be wrong about this) not the precise voltage, but a mid-value for each of ten subranges within full scale. He also wants a ten-LED array with one LED for each of those subranges, indicating where the current voltage is. His V2F produces a frequency range from 5K down to 500 Hz, with absolute symmetry, as it's divided by two at the source. I figure that he can do one of two obvious things to interpret the V2F signal, one of which is to time the pulse width, and the other is to count pulses in a fixed time interval. In either case, the translation from frequency to voltage can be done with a table and that can be translated into the output voltage and the display set accordingly. Whether he uses D2A or PWM is dependent only on how frequently he wants to update. All this will be WAY easier in a well-provisioned MCU that's not too difficult to use, than in hardware, particularly since there are still "loose ends" that have to be resolved, e.g. the desired dynamic range and precision of his output. I'm persuaded that this entire task can be better accomplished within a single-chip MCU rather than with a handful of components. Since he's not cost-sensitive, and since he's not terribly familiar with MCU's, he's going to be happier with a part that does the heavy lifting for him, requiring only that he set the internal hardware up correctly. I suspect the SiLabs 'F12x/13x series with its multi-page SFR map will be a bit much for him, as he's never used 805x devices. It would be preferable to find an MCU that has a suitable evaluation board available so he won't have to build a board right away. I don't know what his project is ... yet ... so I have to believe what he says about his project, and I have to let him decide. The emphasis, from my end, will be toward more on-chip support hardware and less firmware with which to utilize it. RE |
| Topic | Author | Date |
| What would you use? | 01/01/70 00:00 | |
| Try this | 01/01/70 00:00 | |
| Another query | 01/01/70 00:00 | |
| If even you Americans don't understand each other... | 01/01/70 00:00 | |
| My point was ... | 01/01/70 00:00 | |
| PSoC | 01/01/70 00:00 | |
| The display is really simple | 01/01/70 00:00 | |
| there is a '51 PSoC | 01/01/70 00:00 | |
| 8051=PSoC3 | 01/01/70 00:00 | |
| There are several ways... | 01/01/70 00:00 | |
| It's going to have to be a delicate introduction to MCU's | 01/01/70 00:00 | |
| parametric search | 01/01/70 00:00 | |
| Couldn't find that ... this time | 01/01/70 00:00 | |
| built-in DAC | 01/01/70 00:00 | |
| also in some 3xx's | 01/01/70 00:00 | |
| C8051F330-GP | 01/01/70 00:00 | |
| I've decided that's a good choice | 01/01/70 00:00 | |
| Maybe drive LEDs without LED driver? | 01/01/70 00:00 | |
I haven't yet considered that ... | 01/01/70 00:00 | |
| Analog DevicesADUC814 | 01/01/70 00:00 | |
| That's one of the sheets I sent him | 01/01/70 00:00 | |
| 2 chips maybe better | 01/01/70 00:00 | |
| what resolution? | 01/01/70 00:00 | |
| They're under consideration | 01/01/70 00:00 | |
| '51 with d to a | 01/01/70 00:00 |