PIPDIO48-1

48-Line High Current Digital I/O PC/104 Module

The PIPDIO48 (Garnet-MM) is a PC/104-format digital I/O board with 48 lines of I/O. It contains two 82C55 ICs, each having 3 8-bit I/O ports. Each 82C55 has its own 50-pin I/O header for external connections. Direction on all ports is selected by programming control registers built in to the 82C55 chips.

All I/O lines are buffered with transceivers, whose directions are controlled by logic which responds to the direction control values written to the 82C55s. Each line is capable of sourcing 35mA in a logic low state or sinking 6mA in a logic high state. The board is constructed entirely with CMOS logic to reduce power consumption and requires only +5V for operation.

PIPDIO48's I/O headers are organized to allow direct interfacing to OPTO-22's isolated I/O racks, including the G4 series, the PB16-H, -J, -K, -L, PB8H, and the PB24HQ. These racks and I/O modules allow up to 3000 VRMS isolation between the computer and the user's signals. All control signals, power, and ground on the PIPDIO48 I/O header match the corresponding signals on these I/O racks, so a single 50-pin ribbon cable is all that is needed to make the connection.

The board provides access to interrupt levels 2-7 on the PC bus for real-time background applications. Interrupts can be generated in two ways. In Mode 0 operation, a rising edge on one of four interrupt lines causes the board to generate an interrupt request on the bus. In Mode 1 operation, the 82C55 generates interrupts in response to handshake signals between PIPDIO48 and external circuitry.

Software drivers are included with PIPDIO48 to allow controlling the board from Microsoft C, QuickC, GW-Basic, and QuickBasic languages. The software driver supports all of the board's features, including interrupt operation. Example programs demonstrate the use of the function calls and provide a starting point for program development.

Technical Features

Digital I/O
Chip	82C55 (qty. 2)
Number of I/O lines	48
Direction	Programmable in groups of 4 or 8
Input voltage
Low:	-0.0V min, 0.8V max
High:	2.0V min, Vcc max
Output voltage
Low:	0.0V min, 0.55V max
High:	2.0V min, Vcc -0.3V max
Output current
Logic 0:	64mA max per line
Logic 1:	15mA max per line
Output drivers	74F245/74F243
General
Power supply	+5V +/-10% @ 160mA typical
Temperature	0° to +70°C
PC/104 Bus	8 bits
Weight	-24: 2.7 oz/76g -48: 3.0 oz/85g

Information contained in this document is subject to change without notice.
Other products and companies referred to herein are trademarks or registered trademarks of their respective companies or mark holders.