BL4S200 DIO sourcing current

Does anyone know how much current one of the DIO lines can source from this board. I have it setup to output a TTL level and with no load the voltage is 4.65 Volts. If I put a 10K resistor on it, the level gets pulled down to 1.2Volts telling me that it can’t output much current at all.

The spec sheet does not have a number for how much current it can source from this line, only how much current it can sink. Any help is appreciated.

The DIO pins on the BL4S200 are only designed to work as sinking digital outputs according to the user manual. If you require sourcing outputs you need to use the high current outputs which can handle 2A in either mode but do require an external PSU connection to K1 and K2.