| ??? 02/28/06 05:19 Read: times |
#110901 - Remember ground Responding to: ???'s previous message |
When is Ground not Ground?
When it has floated up due to the IR drop. I=current R=resistance V = I*R The ground at the last position will float up by the above formula. Each connector has a little resistance. Each undersized trace has more resistance then it should. Vcc will drop by the same amount across the run. The ground float will kill you first. Example TTL .7 volts rise puts you out of spec. You may want to run a seperate VCC and Ground every "N" number of boards. |
| Topic | Author | Date |
| m5451 3 output bits | 01/01/70 00:00 | |
| please no numbers | 01/01/70 00:00 | |
| m5451 | 01/01/70 00:00 | |
| maybe you can, but with some trouble | 01/01/70 00:00 | |
| ST 4-5 digit LED driver | 01/01/70 00:00 | |
| ??? | 01/01/70 00:00 | |
| multiplexing | 01/01/70 00:00 | |
| multiplexing chips. | 01/01/70 00:00 | |
| seek and ye shall find | 01/01/70 00:00 | |
| Intersil and Maxium | 01/01/70 00:00 | |
| Erik | 01/01/70 00:00 | |
| sure | 01/01/70 00:00 | |
| EE question. | 01/01/70 00:00 | |
| the problem is not power | 01/01/70 00:00 | |
| i2c | 01/01/70 00:00 | |
| i2c | 01/01/70 00:00 | |
| no answer possible | 01/01/70 00:00 | |
| module "string" | 01/01/70 00:00 | |
| Current? | 01/01/70 00:00 | |
| current. | 01/01/70 00:00 | |
| Supply lines | 01/01/70 00:00 | |
| Remember ground | 01/01/70 00:00 | |
| ground last module. | 01/01/70 00:00 | |
| last module. | 01/01/70 00:00 | |
| I disagree | 01/01/70 00:00 | |
| supply lines | 01/01/70 00:00 | |
| Sorry, my bad | 01/01/70 00:00 | |
| supply lines. | 01/01/70 00:00 | |
| If DM mean diode matrix, then | 01/01/70 00:00 | |
| DM | 01/01/70 00:00 | |
| you still are, where is the answer? | 01/01/70 00:00 | |
| still are. | 01/01/70 00:00 | |
not the capability of the driver, the cu | 01/01/70 00:00 |