Universal I/O Module Specification
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- Category: Universal I/O Modules
- Last Updated on Monday, 28 March 2011 07:29
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Universal I/O modules provide a way to customize I/O interfaces to timing modules. By releasing the module specification users are enabled to build modules of their own meeting their special I/O requirements.
An Universal I/O module is plugged into a standard 2x10 dual in line 2.54 mm header on the carrier board. The part number of the mating plug used on the Universal I/O module is:
| Manufacturer | Product Number |
| AMP/Tyco | 1-969973-0 |
Two supply voltages are provided on the pin header: +3.3 VDC and +5 VDC. The I/O signalling levels on the header are +3.3V LVCMOS and signals must not exceed +3.3V otherwise severe damage may be caused to the carrier board or the EVG/EVR if a transition board is used. There are separate pins for input and output signals. The signals should be source terminated with a driver impedance matching the characteristic impedance of 50 ohm of the PCB traces.
| Pin | Description |
| 1 | Ground |
| 2 | (reserved) |
| 3 | Universal Input 1 (signal from Universal I/O module to carrier) |
| 4 | (reserved) |
| 5 | Ground |
| 6 | Ground |
| 7 | Universal Output 1 (signal from carrier to Universal I/O Module) |
| 8 | +3.3 VDC supply |
| 9 | (reserved) |
| 10 | +3.3 VDC supply |
| 11 | (reserved) |
| 12 | +5 VDC supply |
| 13 | Universal Input 0 (signal from Universal I/O module to carrier) |
| 14 | +5 VDC supply |
| 15 | Ground |
| 16 | Ground |
| 17 | Universal Output 0 (signal from carrier to Universal I/O Module) |
| 18 | (reserved) |
| 19 | Ground |
| 20 | (reserved) |
Note! Pins labeled (reserved) may be connected on the carrier board. These pins should be left unconnected on the Universal I/O Module. During power up/power down all I/O signals have weak pull-up resistors of approximately 10 kohm. To make sure signals levels are kept low during power cycling a pull-down resistor of 1 kohm to ground can be used.
The mechanical dimensions of an Universal I/O Module with Lemo 00-series sockets is shown in the figure below.
