| ??? 11/24/09 20:03 Read: times |
#171137 - Receiving output from ADC0848. |
I am monitoring temperature using an ADC0848(8 input channel ADC). However the digital output of the circuit remains fixed at 1111 1111 even after the end of conversion( actually,the 8 bit output remains the same as that of the port of my microcontroller board where it being given. In the above instance , since I have made the port an input port by making it 1111 1111, the output also remains the same after EOC)
The ADC even sends a INTR pulse indicating end of conversion. However, the output doesn't change. What could be the reason? Also, I've noticed something very peculiar about the ADC. I'm powering the ADC chip through my MC board itself. If I remove the wire connecting the VCC of the ADC to 5v coming from the MC board( while the MC board is still powered up), the voltage between Vcc and Gnd of the ADC chip still remains 4.5V! Is my ADC 0848 blown up? Thanks Yash Chitalia. |
| Topic | Author | Date |
| Receiving output from ADC0848. | 01/01/70 00:00 | |
| Don't feed other pins without VCC | 01/01/70 00:00 | |
| CS and RD working. | 01/01/70 00:00 | |
| Wrong understanding of ADC! | 01/01/70 00:00 | |
| But according to Mazidi... | 01/01/70 00:00 | |
| No, you don't! | 01/01/70 00:00 | |
| Sorry! | 01/01/70 00:00 | |
| How do you see that? | 01/01/70 00:00 | |
| The LCD shows a 255. | 01/01/70 00:00 | |
| But this can have zillions of reasons... | 01/01/70 00:00 | |
| Never retype source code when posting | 01/01/70 00:00 | |
| Working! But with errors... | 01/01/70 00:00 | |
| You must convert raw ADC reading into temperature | 01/01/70 00:00 | |
Self-heating? | 01/01/70 00:00 | |
| Configured as push-pull? | 01/01/70 00:00 | |
| It's a P89v51RD2 | 01/01/70 00:00 | |
| Difference only noticeable if contention | 01/01/70 00:00 | |
| then STOP what you are doing | 01/01/70 00:00 |