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2.6
LEDs and switches
Three LEDs are used as an output to indicate to the user the functioning of the module. A red LED glows
constantly indicating an adequate power supply is available to the board. A green LED blinks continuously to
indicate the functioning of PPS (pulse per second). All user-indicated functions are denoted by the yellow LED
when the USER switch (SW3) is pressed. The other two push button switches (SW1, SW2) are used to take input
such as RESET or WAKE UP from the user.
2.7
40 PIN GPIO CONNECTOR
The on-board devices are controlled through the main board using various peripheral pins available on the GPIO
connector. The series resistors are used to isolate the pins of the GPIO connector.
UM3283 - Rev 1
Figure 10.
LEDS and switches circuit
UM3283
Component description
page 9/29
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