M.2 16-ch Isolated Digital Inputs with Change-of-State

  • Description
  • Specifications
  • Ordering Guide

The M.2-II-16 is a 2260/2280 sized M.2 Card designed to be easily panel-mounted in any application environment. It uses the high speed PCI Express bus to transfer digital data to and from the card. The digital I/O is compatible with 8255 PPI chips making it easy to program.

The non-polarized inputs support both AC and DC, and configuration jumpers allow 4.7ms input filters to be enabled per-channel, as desired – required for AC use. The Isolated Inputs support voltages from 3 to 31 VDC/VAC RMS [40Hz to 10000Hz], as well as standard 12/24 AC control transformer signals.

Change of State (COS) detection and interrupt capabilities are designed to relieve software from polling routines that can consume valuable processing time. Each port can be programmed for detecting state changes on their lines, in which any changes of the enabled port’s bits (low-to-high or high-to-low) will generate an IRQ. An ISR (interrupt service routine) then determines which bit changed state and clears the interrupt.

Rounding out the utility of this solution are the 4 LVTTL general purpose I/O lines, programmable as inputs or outputs in groups of 2 lines. These lines are pulled up to VCCIO via 10k ohm resistors, useful for monitoring dry contacts that don’t need isolation.

Interface M.2 2260/2280 with B & M key
Number of Isolated Inputs 16, 8 or 4
Type Non-polarized
Optically isolated from each other and from the computer (CMOS compatible)
Voltage 3 to 31 DC or AC RMS (40 to 10000Hz)
Isolation 500V channel-to-ground and channel-to-channel
Resistance 1.8KΩ in series with opto-coupler
Filter Response Rise-time: 4.7 ms
Fall-time: 4.7 ms
Non-Filter Response Rise-time: 10 μs
Fall-time: 30 μs
Number of DIO 4
Digital Inputs (4 or 2 LVTTL) Logic High: 2.0V to VCCIO (3.3VDC, 5VDC tolerant)
Logic Low 0V to 0.8V
Digital Outputs (4 or 2 LVTTL) Logic High: 2.0V (min) 24mA source
Logic Low: 0.55V (max) 24mA sink
Power Required +3.3VDC @ 360ma (typical)
Operating temperature 0°C to 70degC (standard)
-40ºC to +85ºC (Add -T)
Operating humidity 5% to 95% noncondensing
Weight 6.2g


Model Description
M.2-II-16 M.2 16-ch Isolated Digital Inputs and 4 LVTTL I/Os Card
M.2-II-8 M.2 8-ch Isolated Digital Inputs and 4 LVTTL I/Os Card
M.2-II-4 M.2 4-ch Isolated Digital Inputs and 4 LVTTL I/Os Card
Option: -T -40ºC to +85ºC