Sensoray 311 Manual do Utilizador descarregar pdf (Página 8)

GPIO inputs (JP1)

Pin Signal Pin Signal

1 GPI0 2 LVDD

3 GPINT 4 GPO3

5 GND 6 GND

7 +12V 8 +5V

9 GPO2 10 GPI3

11 GPI2 12 GPI1

13 GPO0 14 GPO1

Notes:

1. GPO0-GPO3 – TTL outputs.

2. GPI1-3 – CMOS inputs.

3. GPI0, GPINT – optocoupled.

Optocoupled GPIO signals

Two of the GPIO signals (GPI0 and GPINT) are optocoupled. The following figures illustrate the use of

optocoupled inputs.

For complete isolation the input should be connected as shown in Figure 1. Supply voltage for the optocoupler

LED is provided on LVDD (pin 2). If a 5 Volt supply is used, then R1 is not necessary, as the internal resistor R3

limits the current. If a higher voltage is used, then the value of R1 must be calculated to limit the current flowing

through the LED to approximately 15mA.

If complete isolation is not required, then the LED can be powered from the 5 Volt output, VDD (pin 8), as shown

in Figure 2. The input is then has to be pulled down to the 311’s digital ground, GND (pins 5 and 6).

For the details on how to use GPINT see the SX11 SDK Software Manual.

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Sensoray 311 Manual do Utilizador Página 8