Functional description
FRDM-K32L3A6 Freedom Development Board, User’s Guide, Rev. B0, 09/2019
12
NXP Semiconductors
configured to be less than VDDA_K32L, the maximum voltage the ADC can convert will be that of
VREFH.
With no light reaching the light sensor, there will be a small current drawn from VDDA_K32L. If it is
desired to measure the lowest MCU current then the trace under J47 will need to be cut.
3.8 User application LEDs
The FRDM-K32L3A6 provides an RGB LED for user applications. A single red LED, D22, is provided
as a general status indicator.
Figure 12
shows the circuitry for the LEDs.
Figure 12. FRDM-K32L3A6 RGB LED circuit
The LEDs are powered by the BRD_PER rail and controlled by Q6 and Q7. This allows the LEDs to
operate while being controlled by GPIO that are powered at a voltage less than BRD_PER. The Blue
and Green LED in the RGB LED will not illuminate when BRD_PER is sourced by less than
approximately 3.2V.
3.9 User buttons
Four tactile buttons are populated on the FRDM-K32L3A6 for Human Machine Interaction (HMI).
Figure 13
shows the circuit for the tactile buttons.
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