thanhtran 10 Posted November 26, 2012 Share Posted November 26, 2012 Can we power the MSP430F5510 from USB without needing an external LDO regulator to provide 3.3v on the Vcc? Here is what I see: 1. If I plug the MSP430F5510 to a USB port, and without any power is applied to the MSP430 VCC pins, I see the pin VUSB provides a 3.3v. This is said as LDO output on the datasheet. 2. If I have 3.3v from an external power source to power the MSP430 then the chip would come alive and enumeration happens. So naturally I think I should be able to connect the VUSB to the VCC pin and should have the MSP430 powered by this VUSB power. 3. But when I do this, the MSP430 is not coming up and not doing enumeration. 4. If I have a LDO connecting to the 5v VBUS to create 3.3v and connect this 3.3v to Vcc, it works fine. So, is there a way we can use the built-in LDO? Thanks -Thanh Quote Link to post Share on other sites
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.