| ??? 11/26/05 01:10 Read: times |
#104181 - 1W Responding to: ???'s previous message |
Although you write you load the mcu quite a lot, I doubt it will draw more than 200mA which at 5V gives the 1W loss. '51 cores consume typically 10s of miliamperes, and the 32 I/O can be loaded by a couple of mA each with a limit for the sum of the load. However, the temperature rise depends not only on the power loss, but also on the heat transfer, which means mostly how the air is circulating (or not) around the chip.
Also, once I was alarmed by an unexpectedly hot chip... until I noticed the power supply was too high and the regulator gave out a lot of heat, which got conducted through the PCB/power/ground lines to the chip... Jan Waclawek |
| Topic | Author | Date |
| Should 51's get warmed under work ? | 01/01/70 00:00 | |
| warm... or hot? | 01/01/70 00:00 | |
| Amount of heat | 01/01/70 00:00 | |
| 1W | 01/01/70 00:00 | |
| S52 devices | 01/01/70 00:00 | |
| Recommended vs maximum ratings | 01/01/70 00:00 | |
| YES | 01/01/70 00:00 | |
| Total Power / Input Voltage | 01/01/70 00:00 | |
| source of heat | 01/01/70 00:00 | |
Port loading is hardly responsible for.. | 01/01/70 00:00 |