Taggsladder 2 Posted June 11, 2015 Share Posted June 11, 2015 Hello guys and gals Another newbie question I have a device that I want to communicate with over UART using the good old MSP430G2553. The device will have a supply voltage of about 4V and has an absolute max voltage rating of 3.1V on any input pin including the UART, typical 2.8V. Min. 2.4V for HIGH. First of all, from what I can read from the datasheet the MSP430 will have a UART logic high of Vcc - 0.3V and I am thinking that since the MSP430 supply voltage range is 1.8-3.6V, would it be "good practice" just to power the MSP430 with let's say 2.8V and thus have compatible UART levels with the other device or should I opt for a logic level converter? Pros cons? Also in the MSP430 datasheet I noted that there is a relation between supply voltage and system frequency. So will the mcu not run at full speed if I power it at 2.8V? It looks like it would be around 12MHz at that voltage. Thanks Kind regards Andreas Quote Link to post Share on other sites
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