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1300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodOD1 Reference Manual Revised March 30, 2015 This manual applies to the PmodOD1 rev. A Overview The Digilent PmodOD1 uses open-drain MOSFETs to drive high current applications. Features include: Two NTHD4508 dual power N-Channel 1) ChipFETs 4.1A peak output current (t < 5s) 3.0A continuous current (at 25C) 20V max. output voltage The PmodOD1. 1 Functional Description The PmodOD1 utilizes two NTHD4508 dual power N-FETs. Each channel can comfortably drive 3.0 A of continuous current at 25C and up to 4.1 A of current for under 5 seconds, making this Pmod ideal for high current applications that require a simple on/off switch mechanism. 2 Interfacing with the Pmod The PmodOD1 communicates with the host board via the GPIO protocol. A logic high signal turns on a particular MOSFET and a logic low signal turns off the MOSFET. Copyright Digilent, Inc. All rights reserved. DOC : 502-125 Page 1 of 2 Other product and company names mentioned may be trademarks of their respective owners. PmodOD1 Reference Manual Typical Circuit (4x) Pin Signal Description 1 G1 Output 1 G1 OD1 2 G2 Output 2 G2 OD2 3 G3 Output 3 G3 J2 4 G4 Output 4 G4 OD3 5 GND Power Supply Ground 6 VCC Positive Power Supply (3.3/5V) GND OD4 Vcc Table 1. Pinout description table. J3 J1 GND VL JP1 J4 Figure 1. PmodOD1 block diagram. Each output provides a clamp diode to prevent damage due to flyback voltages generated by inductive loads. Each output transistor functions independently of the others, so they can be used individually or simultaneously. VL External Voltage GND External Ground Clamp J4 Diode ODn External Load J2 or Output J3 Transistor Figure 2. Output circuit with load connection. As illustrated in Fig. 2, a load is connected so that current from an external voltage source conducts through the load to ground when the output transistor is turned on. In order to complete the circuit, the GND pin on J4 must be connected to the ground for the external voltage supply. Additionally, the external voltage source must be connected to the VL pin on J4 to complete the circuit for the output clamp diode. Any external power applied to the PmodOD1 must be within 2.7V and 5.25V however, it is recommended that Pmod is operated at 3.3V. 3 Physical Dimensions The pins on the pin header are spaced 100 mil apart. The PCB is 1.15 inches long on the sides parallel to the pins on the pin header and 0.8 inches long on the sides perpendicular to the pin header. Copyright Digilent, Inc. All rights reserved. Page 2 of 2 Other product and company names mentioned may be trademarks of their respective owners.