PMC module from Tews Technologies is designed for COTS and transport

A standard single-wide PCI mezzanine card (PMC) -compatible module designed for industrial, COTS, and transportation applications has been announced by Tews Technologies. The TPMC533 has 32 channels of simultaneous sampling true differential bipolar 16-bit analogue input, 16 channels of simultaneous update single-ended unipolar/bipolar 16-bit analogue output and eight channels of tri-state 5.0V-tolerant TTL digital I/O.

All signals are accessible through a HDRA100 type front I/O connector. The PMC-connectors P11 and P12 provide access to the control logic via a 32-bit 33MHz PCI interface.

The ADCs offer differential inputs with software selectable ±5.0 and ±10V bipolar input voltage ranges (one common setting for all eight channels of each ADC). The maximum sample rate of the ADCs is 200ksample per second. There is an oversampling capability with a digital filter.

The DACs offer software selectable 0 to 5.0V, 0 to 10V, 0 to 10.8V, ±5.0, ±10 and ±10.8V output voltage ranges. There are individual settings for each of the four channels of each DAC. The settling time is typically 10-micro seconds and the DAC channels are capable to drive a load of two kOhm, with a capacitance up to 4000pF.

Each TPMC533 is factory calibrated. The correction data is stored in an on-board serial EEPROM on each PMC module. These correction values can be used to perform a hardware correction of every ADC and DAC. Additionally, measurement data read out of a temperature sensor on-board can be used to compensate temperature dependent errors.

The TPMC533 provides two sequencers, one for ADCs and another one for DACs. To perform periodic simultaneous conversions the conversion rates are programmable and can be output to other modules on PMC back I/O connector P14 or front I/O connector DIO pins for synchronisation. The TPMC533 can also operate as a target which means that the conversion rates can be sourced from P14 or front I/O, created by another module.

A frame trigger signal, can be generated by the TPMC533 and output on P14/front I/O or generated by other modules and input from P14/front I/O. The signal can synchronise ADC frames and DAC frames.

The signals on PMC back I/O connector P14 are electrostatic discharge (ESD) protected and driven or read by tri-state 5.0V-tolerant TTL buffers.

The TPMC533 provides input and output FIFOs to be able to collect ADC frames and to output DAC frames. Data transfer on the PCI bus is handled by block transfer mode DMA cycles, initiated by the TPMC533 with minimum host/CPU intervention, says Tews Technologies.

The eight digital TTL tri-state I/O lines with 4.7kOhm pull resistors are also ESD protected. The pull resistors’ voltage is programmable by software and can be 3.3, 5.0, GND or floating level (one common setting for all eight digital I/Os).

All DIOs can be programmed to have their transmitters enabled or disabled individually per I/O line. The digital I/O receivers are always enabled, so each DIO level can always be monitored and can generate an interrupt, triggered on rising edge, on falling edge or both. A debounce filter can be configured to eliminate bounce on the digital I/O lines.

The TPMC533 operates from -40 to +85 degree C. Tews modules have a five year warranty.

Software support for major operating systems such as Windows, Linux, VxWorks, Integrity and QNX is available.

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