True 16-bit PC/104 Analog I/O Module for non-DMA Systems has Filters, IRQs, Digital I/O, Ext Temp, and Autoscan Mode

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Micro/sys announces a new I/O card to our family of PC/104 data acquisition stack-on boards which offers 32 channels of 16-bit analog-to-digital input and 4 channels of 14-bit digital-to-analog output. Designed to meet the need of the new generation of Intel based PC/104 CPUs which no longer have DMA present on the bus, the MPC565 implements First In, First Out (FIFO) registers to organize and pass data back-and-forth over the PC/104 bus. By utilizing the FIFO registers, users gain the advantage of simultaneous read/write functions at convenient intervals without tying up valuable CPU time. Significant attention was given to ensure a low noise analog subsystem which could deliver true 16-bit and 14-bit performance. The rigorous analog input subsystem includes programmable gain amplifiers, programmable low-pass filters, a 16-channel differential input mode (DI), and input overvoltage protection to ±40V, with power on or off. The analog output subsystem includes 1-pole low-pass filters, and output buffers capable of driving cables and other high capatance loads. An on-board EEPROM holds calibration data which is used for installed, end-to-end calibration of input channels.

MPC565 High Performance A/D and D/A PC/104 I/O Board

The MPC565 enables newer non-DMA PC/104 SBCs to perform hi-accuracy A/D and D/A via the popular PC/104 bus without DMA. Its on-board FIFO compensates for the missing DMA function, providing true 16-bit performance with PC/104 simplicity with modern SBCs.

The popular Autoscan mode in the analog input section adds a wealth of choices to the system designer. Various on-board or external “pacer clocks” can be used to cause periodic conversions to occur without any software intervention. An SRAM-based storage area is used to set the include/exclude control, mode (SE or DI), gain, and low-pass filter knee for each channel, individually. Once initiated, the Autoscan mode proceeds, using a 1024 word FIFO register. FIFO flags can trigger a system IRQ to allow efficient servicing by the program.

The MPC565 also includes 12 general-purpose digital I/O lines. These flexible I/O lines can be individually set as input, output, or inputs that generate an IRQ when they transition from low to high. Fault protection is provided on all 12 digital I/O lines.

Analog input range is ±10.1V or ±5.05V. Analog output range is ±10.1V, and all outputs are set to 0V upon power-up or reset. Input and output accuracy is .02% of full scale across the operating temperature range. The input circuitry will allow sampling of 20V p-p at 35KHz, or 5V p-p at 100KHz. The output circuitry can generate 20V p-p signals at 15KHz. Sample programs and full documentation are provided with the board.

An extended temperature version, the MPC565-ET, is also available. The MPC565-ET has proven hight accuracy from –40°C to +85°C. Both versions of the MPC565 require only a single 5V supply to operate. Line regulation on the 5V input is .001% of full scale.

The MPC565 starts at $440 in single quantity and mid $200’s in OEM quantities. Turn-key development kits ship with the first unit allowing immediate out-of-the-box development. Significant OEM discounts are available on all boards. Contact Technical Sales Dept., Micro/sys, Inc., 3730 Park Place, Montrose, CA 91020, phone (818) 244-4600, FAX (818) 244-4246, email: info(at)

About Micro/sys: Since 1976, Micro/sys has specialized in high-performance, compact, rugged, low-power embedded controllers suited for OEMs in demanding environments. Pioneering embedded USB, Microy/sys introduced the industry recognized StackableUSB standard along with a broad offereing of Host and Client USB microcomputer and microcontroller boards. Recently Micro/sys has combined embedded ARM processors with low-power FPGAs, enabling developers to customize applications by programming the FPGA. Micro/sys' microcontroller, ARM, FPGA and x86 single board computers are specified by OEMs in a range of applications including semiconductor processing, medical, military, mail handling, pharmaceutical, industrial marking, process control, and many other industries. For more information, visit the Micro/sys website,

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