terjeio 134 Posted June 27, 2015 Share Posted June 27, 2015 From 2x53 specifications: "The maximum total current, I(OHmax) and I(OLmax), for all outputs combined should not exceed Fmilburn 1 Quote Link to post Share on other sites
Fmilburn 445 Posted June 27, 2015 Share Posted June 27, 2015 @@terjeio thanks for that observation - you have a keen eye [EDIT] I am back at my computer now where I can look at the datasheet. Your reference: "The maximum total current, I(OHmax) and I(OLmax), for all outputs combined should not exceed Quote Link to post Share on other sites
Fmilburn 445 Posted June 28, 2015 Share Posted June 28, 2015 I believe the answer to my questions above is explained here: https://e2e.ti.com/support/microcontrollers/msp430/f/166/t/94929 In this thread a TI employee explains that the quotation from @@terjeio does not specify maximum output current in the sense that higher current would be damaging. It specifies the maximum current to hold a specified voltage drop. This is because The MSP430 is a push/pull CMOS type and sourcing current will result in a voltage drop. In the case of the table and footnote quoted by @@terjeio there is a specified voltage drop of Vcc - 0.3V. If you can tolerate additional voltage drop from the port / pin then the microcontroller can supply more current as shown in the graphs on page 25. I think the resistors at the pins could stand to be larger but are OK. Quote Link to post Share on other sites
RobG 1,892 Posted June 29, 2015 Share Posted June 29, 2015 Check out this thread Fmilburn 1 Quote Link to post Share on other sites
Ourleds 0 Posted June 30, 2015 Share Posted June 30, 2015 if arduino can control, MSP430 is sam but may rewrite a little code. Now i use attiny85 for control RGB LEDstrip It's can but have some code must rewrite. Quote Link to post Share on other sites
Fmilburn 445 Posted July 1, 2015 Share Posted July 1, 2015 I got my RGB strip in today and it is running without a problem on a MSP-EXP430G2. I am powering a single strip with a 12V, 5A source. I used the Adafruit sketch and circuit modified as described in my post above dated 26 June 2015 - 09:40 PM. Now to cut it up and reconfigure it into the shapes and pieces I need... Quote Link to post Share on other sites
Fmilburn 445 Posted July 6, 2015 Share Posted July 6, 2015 I have this running with cut strips and ULN2803 now. Quote Link to post Share on other sites
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