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CodilX

Controlling RGB LED strip with MSP430?

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@@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

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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.

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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.

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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...

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