XPS-D Controller Start-Up Manual
6.0 Appendix B: General I/O Description
This chapter briefly describes all XPS signal types and details each of the XPS
connector interfaces.
6.1 Digital I/O (GPIO3, GPIO5, GPIO6)
All extended digital I/Os are TTL compatible:
• All digital I/Os are not isolated, but are referenced to electrical ground (GND).
• Input levels must be between 0 V and +5 V or 0 V and +12 V.
• All digital inputs are identical, except for GPIO5.DI_15 and GPIO5.DI_16
(synchronization inputs) that have no internal pull-up
• Output levels should be at least +5 V (up to 30 V absolute maximum rating with
open collector outputs).
• Outputs must be pulled up to the user’s external power supply (+5 V to +24 V). This
external power supply must be referenced to the XPS ground (GND).
All digital I/Os are refreshed asynchronously on user requests. Therefore, digital inputs
or outputs have no refresh rate.
Typical delay is 100μs due to the clock cycle and priorities made to other functions.
All digital inputs are in negative logic and have internal +5 V or +12 V pull up resistors,
except for the synchronization inputs, GPIO5.DI_15 and GPIO5.DI_16, that have no
internal pull-up resistors (available for the Extended GPIO).
6.1.1 Digital Inputs
Parameter Symbol Min. Max. Units
Low-Level Input Voltage V
IL
0 0.8 V
High-Level Input Voltage V
IH
1.6 5 V
Input Current LOW I
IL
– -2.5 mA
Input Current HIGH I
IH
– 0.4 mA
Figure 20: Digital TTL input.
GPIOn (n = 3, 5 or 6) inputs can be accessed via the GPIODigitalGet(GPIOn.DI, …)
function.
GPIO5 Synchronization Inputs
Synchronization Input 1: GPIO or External Trigger Input.
Synchronization Input 2: GPIO or Slave Controller Clock Input.
EDH0395En1031 – 09/18 34
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