May 2011

Extended Temperature and High-Density Isolated Serial Communication PMC Module

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A high-density isolated serial communication controller is packaged as a conduction-cooled single-width 32-bit PMC module suitable for applications in transportation, COTS, communications and process control. The TPMC377 from Tews Technologies can operate with 3.3V and 5.0V PCI I/O signaling voltage. It provides 4 channels of RS-232/RS-422/RS-485 selectable serial connectivity with P14 I/O. Each of the serial channels is isolated from the system and against each other by a digital isolator and an onboard integrated DC/DC converter. The cannels can be individually programmed to operate as RS-232, RS-422 or RS-485 full/half duplex interfaces. In addition, programmable termination is provided for the RS-422/RS-485 interfaces. After power-up, all serial I/O lines are in a high impedance state for critical applications.

Each RS-232 channel supports RxD, TxD, RTS, CTS and GND. RS-422 and RS-485 full duplex support a four wire interface (RX+, RX-, TX+, TX-) plus ground (GND). RS-485 half duplex supports a two wire interface (DX+, DX-) plus ground (GND). All channels generate interrupts on PCI interrupt INTA. For fast interrupt source detection the UART provides a special Global Interrupt Source Register.

Each serial channel of the PMC module has separate 64 byte receive and transmit FIFOs to significantly reduce the processing overhead required to provide data to and from the transmitters and receivers. The FIFO trigger levels are programmable, and the baud rate is individually selectable up to 921.6 Kbit/s for RS-232 channels and 5.5296 Mbit/s for RS-422 channels. The UART offers readable FIFO levels. The TPMC377 offers an operating temperature range of -40° to +85°C. Software support for major operating systems such as Windows, Linux, LynxOS, VxWorks, Integrity and QNX is available.

TEWS Technologies,  Reno, NV (775) 850-5830. [].