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User LED Indicators
Four green LED’s are provided for use in application development and debug. Each LED is
configured active-high. Indicators LED1 through LED4 are enabled by the LED_EN option
header. A 3S buffer between the MCU port and the user LED’s provides the drive current
necessary to control the LED’s.
LED_EN
ON
User LED’s enabled active-high
?
?
OFF
User LED’s disabled
LED_EN
Figure 7: LED_EN Option Header
Potentiometer
A 5k ohm, thumb-wheel type, potentiometer at RV1 provides variable resistance input for user
applications. The output is the result of a voltage divider that changes as the thumb-wheel is
turned. The potentiometer is connected between VDD and GND with the center tap providing
the divider output. This center tap is connected to the MCU on signal AN0. The potentiometer
may be disconnected from AN0 by means of the POT_EN option header.
POT_EN
ON
User POT enabled
?
?
OFF
User POT disabled
POT_EN
Figure 8: POT_EN Option Header
Freescale Semiconductor
15
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