Matrix-orbital GTT70A Manuel d'utilisateur télécharger pdf (Page 14)

GTT70A Hardware Manual 10

4.5 General Purpose Outputs

A unique feature of the GTT70A is the ability to control relays* and other external devices using either

one of six General Purpose Outputs.

Figure 16: GPO Header

Table 11: GPO Pinout

Function

Gnd

GPO 1

Gnd

GPO 2

Gnd

GPO 3

Gnd

GPO 4

Gnd

GPO 5

Gnd

GPO 6

Gnd

Vcc

Gnd

Each can source up to 15mA of current at five volts when on, or sink 15mA at zero volts when off. The

two row, fourteen pin header can be interfaced to a number of female connectors to provide control to

any peripheral devices required.

4.6 Keypad Header

To facilitate user input, the GTT70A provides a Keypad Connector which allows a matrix style keypad of

up to twenty-five keys to be directly connected to the display module. Key presses are generated when

a short is detected between a row and a column. When a key press is generated, a character specific to

that key press is automatically sent on the Tx communication line. If the display module is running in I²C

mode, the key press will remain in the buffer until it is accessed using the display read address.

Figure 17: Keypad Header

Table 12: Keypad Pinout

Function

Gnd

Column 1

Row 1

Column 2

Row 2

Column 3

Row 3

Column 4

Row 4

Column 5

Row 5

Gnd/Vcc**

The character that is associated with each key press may be altered using the “Assign Key Codes”

command. The straight twelve pin header of the Keypad Interface Connector will interface to a variety

of different devices including the Matrix Orbital KPP4x4 keypad.

*Note: If connecting a relay, be sure that it is fully clamped using a diode and capacitor in order to absorb any

electro-motive force (EMF) which will be generated.

**Note: The Ground / +5V pin is toggled by the jumper to the right of the keypad connector. Jump pads 1 & 2 for

+5V or 2 & 3 for GND.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19

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