| ??? 12/18/07 17:37 Read: times |
#148460 - Looks like it cannot be done. Responding to: ???'s previous message |
The voltage measured will some times be a negative number. Obviously you cannot apply 20VDC to the LPC935/6. So I have my divider network like this: (332/(221+332)*5 = 3VDC at the AD/C pin of the LPC935/6 So when my max. volt is 5 I will calculte 20VDC after using a multiplier formula. Looks like I cannot read negative voltages with this chip. Sorry for the trouble. Thanks you all. |
| Topic | Author | Date |
| LPC936 with External A/D | 01/01/70 00:00 | |
| Another ADC or a multiplexer | 01/01/70 00:00 | |
| Every 2 seconds | 01/01/70 00:00 | |
| what type of analog signal you are talking about? | 01/01/70 00:00 | |
| I would not, but | 01/01/70 00:00 | |
| Easy | 01/01/70 00:00 | |
| a corrective addition | 01/01/70 00:00 | |
| 74HC4051/74HC4052/74HC4053 | 01/01/70 00:00 | |
| BUT | 01/01/70 00:00 | |
| Then again | 01/01/70 00:00 | |
| Negative readings | 01/01/70 00:00 | |
| Datasheet! | 01/01/70 00:00 | |
| can you please be specific | 01/01/70 00:00 | |
| negative readings? | 01/01/70 00:00 | |
| Not allowed? | 01/01/70 00:00 | |
| Negative ADC readings - again | 01/01/70 00:00 | |
| Like this | 01/01/70 00:00 | |
| I do not understand | 01/01/70 00:00 | |
| BANG!! | 01/01/70 00:00 | |
| In General | 01/01/70 00:00 | |
| Another BANG! | 01/01/70 00:00 | |
| I assumed | 01/01/70 00:00 | |
| Looks like it cannot be done. | 01/01/70 00:00 | |
| you can | 01/01/70 00:00 | |
| Exlain | 01/01/70 00:00 | |
| OK, like this | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 | |
or you can use opamp as non inverting summing amp. | 01/01/70 00:00 |