PMC takes many I/Os for industrial control, telecoms, medical applications

August 29, 2017 //By Julien Happich
The TPMC542 is a standard single-wide PCI Mezzanine Card (PMC) module offering 16 or 8 channels of simultaneous update single-ended unipolar/bipolar 16-bit analog output and 20 channels of tristate capable 5V-tolerant LVTTL/TTL digital input/output.

Released as an extension to Tews’ growing portfolio of PMC modules, the TPMC542 is designed for industrial control, telecommunication infrastructure, medical equipment, traffic control and COTS applications. 

A 32-bit 33 MHz PCI interface is provided via PMC P11 and P12 connectors. The digital I/O signals and analog output signals are accessible via a Mini D Ribbon (MDR68) type front I/O connector.

For each individual D/A channel, output ranges are configurable from 0 to 5V, 0 to 10V, ±5V, ±10V, 4 to 20mA, 0 to 20mA and 0 to 24mA. Additionally, for each voltage range a 20% over-range may be enabled.

The TPMC542 provides a D/A Sequencer unit for periodic simultaneous digital to analog conversions at a configurable conversion rate. In sequencer mode, the D/A conversion data is fetched from buffers in host memory by PCI master DMA transfer and is temporarily stored in an on-board data buffer. The Sequencer provides a Frame Mode used for repetitive frames of simultaneous D/A conversions on a frame trigger signal event.

If the card is operating as a master card in a Multi-Board configuration the conversion clock (conversion rate) and frame trigger signals may be generated on-board for internal use and may also be driven out on P14 rear I/O. If the card is operating as a target card in a Multi-Board configuration the conversion clock (conversion rate) and frame trigger signals may be sourced externally via the P14 rear I/O interface as well.

A debounce filter can be configured to eliminate bouncing on the digital I/O inputs. Each digital I/O line has a 4.7kΩ pull resistor to a common reference. The common pull resistor reference is programmable by software (one setting for all digital I/O lines) to +3.3V, +5V or GND. The module offers an operating temperature range of -40°C to +85°C.

Tews Technologies - www.tews.com