ACCES I/O Products (San Diego, CA) now offers the PCIe-DIO-48S, a 48-channel PCI Express (PCIe) card designed for use in a variety of digital I/O applications. It is compatible with 8255 PPI (mode 0) and features a x1 lane PCIe connector that can be used in any x1 or higher PCI Express slot. It is suitable for use in applications sensing inputs such as switch closures, TTL, LVTTL, CMOS logic and controlling external relays.

Each I/O line is buffered and capable of sourcing 32mA or sinking 64mA. Since the PCI Express x1 connector does not have sufficient power to drive this many channels, ACCES provides an onboard Molex 18-Pin Microcontrollers PC-style connector compatible with system power supplies (for disk drive power) to externally provide maximum 5V current sourcing capability.

Connections to the card are made via two industry-standard, 50-pin headers, each of which has three 8-bit I/O ports designated A, B, and C. Each port can be programmed as inputs or outputs. Change of State (COS) detection and interrupt capabilities are included. An ISR (interrupt service routine) reads the port to determine which bit changed state and then clears the attempt.

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Embedded Technology Magazine

This article first appeared in the March, 2010 issue of Embedded Technology Magazine.

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