Imagine a world where robots and automated systems respond to precise, real-time data – a world made possible by cutting-edge I/O technology. But what if your system's analog input/output capabilities are limited by bulky, inflexible hardware? ACCES I/O Products aims to solve this problem with their latest release: the mPCIe-DAAI16-8F, a high-performance PCI Express Mini Card multifunction analog I/O module.
Let's dive into what this tiny powerhouse offers. ACCES I/O Products Inc. has announced the mPCIe-DAAI16-8F, a compact yet mighty PCI Express Mini Card (mPCIe) designed to deliver exceptional analog input/output (I/O) performance. This module boasts 16-bit precision, simultaneous analog output and input functionality, and configurable digital I/O, making it a versatile solution for a wide array of applications.
ACCES I/O Products emphasizes the module's compact and robust design, making it ideally suited for embedded systems and Original Equipment Manufacturer (OEM) applications. The mPCIe-DAAI16-8F integrates eight 16-bit analog outputs that support both voltage and current outputs. Located in San Diego, California, ACCES I/O Products specifically engineered this module for applications demanding precise 4-20mA control signals – a standard commonly used in industrial automation for transmitting sensor data and controlling actuators. For example, you might use this with a pressure sensor that outputs a 4-20mA signal, allowing your system to accurately monitor pressure levels.
Beyond the flexible Digital-to-Analog Converter (DAC) outputs, ACCES equipped the mPCIe-DAAI16-8F with eight 16-bit analog input channels. And this is the part most people miss: These inputs are software-configurable, offering the flexibility to use them as either eight single-ended inputs or four differential inputs. Differential inputs are particularly useful in noisy environments, as they help to reject common-mode noise, leading to more accurate measurements. Single-ended inputs are simpler to use when noise isn't a major concern.
An aggregate analog-input sampling rate of up to 1 MSPS (Mega Samples Per Second) facilitates accurate dynamic measurements. To clarify, this means the module can capture up to one million samples of analog input data every second, enabling it to track rapidly changing signals. Each DAC channel can perform hardware-paced waveform playback at speeds up to 125 kSPS (Kilo Samples Per Second) per channel simultaneously. The compact, double-stack mPCIe Type F1 form factor with latching I/O connectors ensures reliable operation even in environments prone to shock and vibration, a crucial feature for industrial and mobile applications. ACCES claims this rugged design minimizes the risk of disconnections and ensures consistent performance.
To further enhance the module's adaptability, ACCES offers several factory options. These include extended temperature range operation (from -40°C to +85°C), current inputs (4-20mA, 10-50mA), voltage dividers for handling higher voltage inputs, and even HART modem capability for advanced industrial communication protocols. Additional customization options, such as conformal coating for enhanced protection against harsh environments and custom software/product labeling, are also available. ACCES highlights that their FPGA-based design allows them to implement entirely new features tailored to a customer's specific needs. This level of customization sets them apart from competitors offering more rigid, off-the-shelf solutions.
Here's a quick rundown of the key features of the PCI Express Mini Card mPCIe-DAAI16-8F family:
- mPCIe Type F1 (full length) with high-retention latching connectors for robust operation in high-vibration environments.
- Eight 16-bit analog outputs with software-selectable current (4–20 mA, 0–20 mA, 0–24 mA) and voltage ranges, providing versatile control options.
- Up to 1 MSPS aggregate ADC rate, enabling high-speed data acquisition.
- Seven per-channel programmable differential, bipolar input ranges, offering flexibility in signal conditioning.
- Eight digital I/O pins (four inputs and four outputs) usable for triggering, status monitoring, or control purposes. These pins also support optional digital integration features such as pulse/PWM generation and measurement, edge-specific Interrupt Requests (IRQs), and counting capabilities.
- Flexible Analog-to-Digital (A/D) triggering options, including software trigger, internal timer trigger, external trigger, and externally triggered timer start for precise synchronization.
- Onboard watchdog timer with status output for enhanced system reliability. A watchdog timer is a safety mechanism that automatically resets the system if it detects a fault or unresponsive condition.
- Factory options: HART modem (on DAC #0), 4–20 mA / 10–50 mA ADC inputs, per-channel input voltage dividers, conformal coating, and more, further expanding the module's capabilities.
- Made in the U.S. and compliant with the European Union’s Restriction of Hazardous Substances directive (RoHS), ensuring environmental responsibility.
ACCES emphasizes that the module's small size – mPCIe Type F1: 30 x 50.95 mm (1.1 to 2 in.) – allows for maximum performance in embedded applications where space is at a premium. This compact form factor makes it suitable for integration into space-constrained devices without sacrificing functionality.
ACCES understands that compatibility is key. The cards are compatible with most operating systems and include a free software package for both Linux and Windows. This package includes sample programs and source code in C# and Delphi for Windows developers, facilitating rapid application development. Linux support includes installation files and code samples for programming-level access via the company's open-source kernel driver.
Third-party support includes a Windows-standard Dynamic Link Library (DLL API), making the module accessible from a wide range of popular programming environments. Embedded OS support encompasses the family of Windows operating systems, including those tailored for the Internet of Things (IoT).
ACCES also now offers a VxWorks driver/library, catering to the needs of real-time process monitoring and control applications. In addition to the mPCIe-DAAI16-8F, ACCES offers a comprehensive range of analog, digital, serial communication, and isolated I/O boards and systems, including a line of rugged USB hubs.
Furthermore, ACCES provides complete system integration services and enclosures, offering customers a one-stop shop for their I/O needs. The company designs its products for seamless integration with various form factors, including mPCIe, M.2, PCI Express, PCIe/104, Ethernet, USB, PCI, PC/104, and ISA, as well as distributed, wireless I/O, and computer-on-module (COM) solutions.
But here's where it gets controversial... While ACCES emphasizes ease of use and broad compatibility, the reliance on specific operating systems and programming languages might limit its adoption in highly specialized or niche applications requiring custom-built software environments. Is this a reasonable trade-off for the convenience and accessibility offered by their software package? Also, could the FPGA-based customization options become costly for smaller projects?
What are your thoughts on this new module from ACCES I/O Products? Do you see a strong need for compact, high-performance analog I/O solutions in your field? Would this module be a good fit for your next project, or do you prefer alternative solutions? Share your opinions and experiences in the comments below!
