NXP Semiconductors MCX-N9 EVK Series - Push Buttons

NXP Semiconductors
UM12036
MCX-N9XX-EVK Board User Manual
1.7 Push buttons
Tactile buttons are populated on the MCX-N9XX-EVK board for human machine interaction (HMI). Each of the
SW[4:2] buttons has a 0.1 µF bypass capacitor for debouncing and pads for external pull-up resistors, if desired.
Table 4 describes the MCX-N9XX-EVK push buttons. The push buttons are shown in Figure 3.
Part identifier Switch name Description
SW1 Reset button (MCX N94X RST) Pressing SW1 resets the target MCU that causes board peripherals to
reset to their default states and execute the boot code. When SW1 is
pressed, the reset LED D21 turns ON.
SW2 Non-maskable interrupt (NMI)
button
SW2 is designated as the MCX N94X NMI pin (however, the MCX
architecture allows for any of the pins to operate as the NMI pin). It
also acts as a general-purpose input.
SW3 In-system programming (ISP)
mode switch
SW3 is an ISP mode switch (it is a white-colored push button for easy
identification) and can also act as a general-purpose input. It is shared
with the clock output (clkout) header, J16.
Note: The bypass capacitor, C150, affects the clock output (clkout)
performance. To use the clock output function, the C150 capacitor
must be removed.
Note: Apart from the SW3 button, ISP mode can also be enabled or
disabled through the JP49 jumper. For details, see Section 1.6.
SW4 Wakeup button SW4 is a general-purpose input as well as a low-power wake-up unit
(WUU) pin. This allows for demonstration of Power Down and Deep
Power Down applications that use a push button wakeup.
SW5 PMIC reset Pressing this button resets the PCA9420 PMIC if pins 1-2 are shorted
(default configuration) for the JP43 jumper.
SW6 MCU-Link reset Pressing this button resets the MCU-Link processor (LPC55S69).
Table 4. MCX-N9XX-EVK push buttons
Figure 5 shows the circuit diagrams of the MCX-N9XX-EVK push buttons.
Figure 5. Push button circuit diagram
UM12036 All information provided in this document is subject to legal disclaimers. © 2024 NXP B.V. All rights reserved.
User manual Rev. 1 — 20 January 2024
12 / 51