XMC Mezzanine Module • Dual Isolated EIA/TIA-232 Asynchronous Interfaces

The DU2-PONY is a XMC standard single-width mezzanine card, equipped with a PCI Express® to dual-UART bridge. Two RS-232 transceivers with internal 2.5kV isolation barrier provide for optimum noise and EMC immunity. The front bezel D-Sub connectors withstand up to 250VAC measured against shield.
The 950-style UARTs (COM ports) are compatible with any asynchronous serial application. Certified device drivers are available for Windows®. The 460kbps EIA/TIA-232-E transceivers allow for hardwired CTS/RTS handshake, and are well suited for operation in electrically harsh environments. The DU2-PONY is equipped with the PLX OXPCIe952 single chip PCI Express® to UART bridge, which is suitable for asynchronous baud rates up to 15Mbps. Compared to the PC style RS-232 D-Sub pin assignment, the UART RX/TX signals are supported, and in addition CTS/RTS for (optional) hardwired handshake. The DCS, DSR, DTR and RI signals are not in use.
Two ADM3252E transceivers are provided to meet the TIA/EIA-232-E physical layer specifications. The RS-232 signals of both serial ports are isolated from the board circuitry, and also isolated from each other. Due to the D-Sub connector specification, a maximum of 250VAC between the RS-232 signals measured against shield (front bezel) must not be exceeded.

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  • Form factor XMC single-width mezzanine card 139mm x 74mm
  • Stack height 10mm XMC to host
  • Host I/F Connector P15 XMC – PCI Express, single lane, single link
  • Option P15 connector according to VITA 61 XMC 2.0
  • +3.3V operated (VPWR not in use)
  • PCI Express® bridge to dual-port UART
  • PLX Oxford 950 UART w. 128-byte transmit/receive FIFO
  • Asynchronous baud rates up to 15Mbps (UART)
  • Windows® & Linux device driver support
  • 2.5kV isolation barrier RS-232 transceivers (Analog Devices isoPower)
  • Transceivers meet EIA/TIA-232-E specifications
  • High data rate up to 460kbps
  • ±8kV/±15 kV ESD protection on transceiver input/output pins
  • High common-mode transient immunity >25 kV/µs
  • Suitable for high noise data communications and diagnostic ports
  • Two front bezel male 9-pin D-Sub connectors (RXD/TXD, CTS/RTS)
  • RS-232 ports isolated against each other and board circuitry (limited to 250VAC by D-Sub connector characteristics)

Simplified Block Diagram

du2 blk
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