| ??? 12/18/04 22:35 Read: times |
#83439 - Why Waste the Chips?? Responding to: ???'s previous message |
I am somewhat puzzled as to why you want to futz around with the extra chips to re-accumulate the count from the HCTL2020 chip for the DAC. Since you said that you are already getting the count into the microcontroller so that you can display the angle on the LCD display would it not be far far easier to just connect the DAC to the microcontroller directly and let software update the DAC value. At a +/- 2000 degree angle (total of 4000 degrees) a 12-bit DAC (4096 steps) is going to simply output at a resolution of about 1 LSB per degree.
I believe that it is possible to find DAC chips with serial interfaces so that the pin count impact to the microcontroller is minimized. You could also look at the chip selections from Silicon Labs. They have a number of chips in their line that have onboard 12-bit DACs. All you would have to add is an analog buffer that would translate the output of the onchip DAC to the +/-10 volt range. Michael Karas |
| Topic | Author | Date |
| +/- 10V for +/- 2000 deg angle | 01/01/70 00:00 | |
| Only an idea | 01/01/70 00:00 | |
| Another idea | 01/01/70 00:00 | |
| Midpoint zero | 01/01/70 00:00 | |
| Why Waste the Chips?? | 01/01/70 00:00 | |
| Pins and more pins | 01/01/70 00:00 | |
| why change the MCU? | 01/01/70 00:00 | |
| I2C already implemented. | 01/01/70 00:00 | |
| Overlooked IIC interface | 01/01/70 00:00 | |
| where, where not IIC | 01/01/70 00:00 | |
| DAC not thumbwheels | 01/01/70 00:00 | |
| Why not... | 01/01/70 00:00 | |
| Endurance rating | 01/01/70 00:00 | |
| final stability/precision, | 01/01/70 00:00 | |
| Yet Another Idea | 01/01/70 00:00 | |
| Drop in replacement??? | 01/01/70 00:00 | |
| I2C DAC | 01/01/70 00:00 | |
MAX1104 | 01/01/70 00:00 |