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S08 current capacity

Question asked by Kerry Mackenroth on Feb 10, 2010
Latest reply on Feb 12, 2010 by Kerry Mackenroth


My project, using a MC9S08LC36, has to drive an LED. The load is 25mA at 2.0V forward voltage. I plan to configure three I/O pins ganged for power, set to High Output. Here are my questions:

* Is this MCU rated for this load. The remaining circuits only add an additional 1mA, so the total load is 26mA. I cannot glean this data from the Freescale book.

* If the MCU can indeed support this load, what is best - To sink or source the load? I prefer to sink to ground as it would provide a convenient means of testing for power to the LED before configuring the three pins for sinking.