In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

Steel, if your goal is to provide current, the path must go through the controller, this means you have to provide two pins on the controller, the high side which is connected from Vcc to the controller, and the low side which is connected to the collector. Whether you need a resistor as well (the 1k as shown in the schematic) depends on the resistance of the path through the controller and your desired current flowing through the controller. As you have it now, a voltage is being supplied to the controller, this is fine if the impedance looking into pin 1 of the connector is high, but if it's low, the controller will be always be on.

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