NXP MCUX Low-power Analog Comparator (LPCMP)

Overview

This sample show how to use the NXP MCUX Low-power Analog Comparator (LPCMP) driver.

In this application, the negative input port of the LPCMP is set with CONFIG_LPCMP_NEGATIVE_PORT which means the input voltage comes from the LPCMP internal DAC. The reference voltage of the DAC is set to 0 (check the reference manual to confirm the voltage source for your specific chip). The output voltage of the DAC equals (VREF/256)*(data+1), where data is set through the attribute SENSOR_ATTR_MCUX_LPCMP_DAC_OUTPUT_VOLTAGE. The positive input port is set with CONFIG_LPCMP_POSITIVE_PORT. Check the reference manual and board schematic to confirm which specific port is used. You can connect an external voltage to that port and change the input voltage to see the output change of the LPCMP.

The output value of the LPCMP is reported on the console.

Building and Running

Building and Running for NXP FRDM-MCXN947

Build the application for the FRDM-MCXN947 board, and adjust the LPCMP positive input port voltage by changing the voltage input to J2-17.

west build -b frdm_mcxn947//cpu0 samples/sensor/mcux_lpcmp
west flash

Building and Running for NXP FRDM-MCXN236

Build the application for the FRDM-MCXN236 board, and adjust the LPCMP positive input port voltage by changing the voltage input to J2-8.

west build -b frdm_mcxn236 samples/sensor/mcux_lpcmp
west flash

Building and Running for NXP FRDM-MCXA156

Build the application for the FRDM-MCXA156 board, and adjust the LPCMP positive input port voltage by changing the voltage input to J2-9.

west build -b frdm_mcxa156 samples/sensor/mcux_lpcmp
west flash

Building and Running for NXP FRDM-MCXA153

Build the application for the FRDM-MCXA153 board, and adjust the LPCMP positive input port voltage by changing the voltage input to J2-9.

west build -b frdm_mcxa153 samples/sensor/mcux_lpcmp
west flash

Building and Running for NXP FRDM-MCXA346

Build the application for the FRDM-MCXA346 board, and adjust the LPCMP positive input port voltage by changing the voltage input to J2-17.

west build -b frdm_mcxa346 samples/sensor/mcux_lpcmp
west flash

Building and Running for NXP FRDM-MCXA266

Build the application for the FRDM-MCXA266 board, and adjust the LPCMP positive input port voltage by changing the voltage input to J2-17.

west build -b frdm_mcxa266 samples/sensor/mcux_lpcmp
west flash