Galil DMC-3425 user manual High Power Digital Outputs, Figure A-6

Note that the current through the digital input should be kept below 3 mA in order to minimize the power dissipated in the resistor pack. This will help prevent circuit failures. The resistor pack RPx4 is standard 1.5k ohm that is suitable for power supply voltages up to 5.5 VDC. However, use of 24 VDC for example would require a higher resistance such as a 10k ohm resistor pack.

High Power Digital Outputs

The first two banks on the IOM-1964, banks 0 and 1, have high current output drive capability. The IOM-1964 is shipped with banks 0 and 1 configured as outputs. Each output can drive up to 500mA of continuous current. Configuring a bank of I/O as outputs is done by inserting the optical isolator NEC2505 IC’s into the Ux1 and Ux2 sockets. The digital input IC’s Ux3 and Ux4 are removed. The resistor packs RPx2 and RPx3 are inserted, and the input resistor pack RPx4 is removed.

Each bank of eight outputs shares one I/OC connection, which is connected to a DC power supply between 4 and 28 VDC. A 10k ohm resistor pack should be used for RPx3. Here is a circuit diagram:

To DMC-3425 +5V

1/8 RPx2

DMC-3425 I/O

1/4 NEC2505

1/8 RPx3

I/OCn

	IR6210
	VCC
IN	OUT	PWROUTn
	GND
		I/On

OUTCn

Figure A-6

The load is connected between the power output and output common. The I/O connection is for test purposes, and would not normally be connected. An external power supply is connected to the I/OC and OUTC terminals, which isolates the circuitry of the DMC-3425 controller/DB-14064 daughter board from the output circuit.

I/OCn

PWROUTn

Current

OUTCn

Figure A-7

L o a d

VISO

External

Isolated

Power

Supply

GNDISO

DMC-3425 Appendices• 187