| Michael Karas 02/03/10 22:10 Read: 207 times Beaverton Or USA |
#172881 - SiLabs Parts Can Interface 5V logic Responding to: Grant Beattie's previous message |
You can use a 3.3V powered SiLabs MCU in this application. The pins on these parts are 5V tolerant. Inputs to the MCU can simply be attached to 5V logic from the other circuitry. For outputs from the MCU the easiest thing to do is to leave the I/Os programmed in bidirectional mode and then provide appropriate pullups to 5V for each output. If you have any outputs that require higher speed (i.e. you think you need to program the output pins for push-pull mode) then you can use an appropriate external chip on these lines to convert the 3.3V swing of the MCU output to a 5V logic level. One chip family that can do this conversion for you is the 74AHCT series.
Michael Karas |
| Topic | Author | Date |
| 5v Flash 8051 (low pin count) | Grant Beattie | 02/03/10 15:36 |
| NXP: LPC9xx? | Andy Neil | 02/03/10 15:56 |
| Older? | Neil Kurzman | 02/03/10 17:12 |
| WHY 5v??? | Erik Malund | 02/03/10 18:26 |
| Yes they have the M8 core | Grant Beattie | 02/04/10 08:10 |
| SiLabs Parts Can Interface 5V logic | Michael Karas | 02/03/10 22:10 |
| re SILabs | Erik Malund | 02/04/10 10:00 |
SiLabs | Maarten Brock | 02/08/10 13:16 |
| LPC900 are 5V input tolerant | Joe Gold | 02/04/10 06:18 |
| See App Note cited earlier | Andy Neil | 02/04/10 07:23 |
| 5-volt LP9xx1? | Jan Waclawek | 02/04/10 15:14 |
| check also | Stefan KAnev | 02/05/10 03:33 |