lorenzoarce Posted April 24, 2010 Report Share Posted April 24, 2010 We have a board, which is powerd by an AC/DC converter of 12V and 2A. In the board there is a 5V regulator (LM1117-T-5.0) and another of 3.3V (LM1117-T-3.3). The 3.3V one is powered by the 5V one. The 3.3V regulator powers a MSP430F149 microcontroller. The 5V regulator powers the coils of 2 relays controlled by 2 relay drivers. These are made up of a transistor in cutoff/saturation which controlles the current throught the coil. Each driver is controlled by a digital output of the microcontroller.The issue we have detected is that, sometimes, when we change the state of the drivers, the microcontroller resets. I guess it is a power problem, but I would appreciate any idea about what is happening there. I would thank you for any advise about what test I can do.Thanks in advance. A simplified schematic is attached. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.