The low power measurement demo is used to reproduce the power consumption and wake-up time in the datasheet on the FRDM-MCXN236 board.
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FRDM-MCXN236 Rev C board.
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One Type-C USB cable.
If you want to measure wake-up time, prepare an oscilloscope or logic analyzer.
If you want to measure power consumption, prepare an MCU-Link Pro or multimeter.
- Remove R71, solder header at JP2 and use jumper to connect.
- Use a Type-C USB cable to connect J10 of FRDM-MCXN236 and the USB port of the PC.
- The default configuration for this project is WAKEUP_EN=0, which is used to reproduce the power consumption data in the datasheet. If you want to reproduce the wake-up time in the datasheet, need to update it to WAKEUP_EN=1.
- Make and Download the project to FRDM-MCXN236, then reset the MCU.
- Open a serial terminal with 57600 baud rate.
- Follow the prompts and input number to enter different power mode.
- After inputting the case number, the symbol and registers value will be printed.
- Use an multimeter to measure the current at JP2 of the FRDM-MCXN236 board.
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Use MCU-Link Pro and MCUXpresso IDE to measure power consumption:
- Configure the MCU-Link Pro current measurement range from 350mA to 50mA by changing the 3 jumpers J16/J17/J18 to short pins 2-3.
- Connect MCU-Link Pro board to FRDM-MCXN236 board.
MCU-Link Pro FRDM-MCXN236 J9-1 JP2-2 J9-3 JP2-1 J9-2 J3-14 - Follow below steps to measure current with MCUXpresso IDE.
- Get the wake-up time by measuring the delay between the falling edges of J8-13 (P0_20) and J8-28 (P3_11) using an oscilloscope.
- You need to press SW2(WAKEUP button) to wake up the MCU.
The following power consumption and wake-up time are provided as a reference:
Different samples, temperature and measuring instrument etc. will affect test results.
Before measuring each data, POR is required.
If you want to measure power consumption of IDD_CM_OD_1, please porting CoreMark to this project.
The wake-up time of Deep Power Down needs to be configured as 144MHz boot, and all other measurement data uses the default 48MHz boot.
If you want to measure the wake-up time of other configurations, please refer to table 228. LPWKUP_DELAY configuration in Reference Manual to configure LPWKUP_DELAY.
“Table 18. Power mode transition operating behaviors” in datasheet lists wake-up time, “3.2.6 Power consumption operating behaviors” in datasheet lists different power consumption data.
| Symbol | Power consumption in datasheet | Tested Power consumption | Wake-up time in datasheet | Tested wake-up time |
|---|---|---|---|---|
| IDD_ACT_OD_1 | 7.43mA | 7.68mA | N/A | N/A |
| IDD_CM_OD_1 | 8.93mA | 8.76mA | N/A | N/A |
| IDD_SLEEP | 1.48mA | 1.45mA | 0.22us | 0.22us |
| IDD_DSLEEP_LP | 0.12mA | 0.12mA | 8.7us | 8.6us |
| IDD_PDOWN_LP | 1.75uA | 1.95uA | 9.8us | 9.7us |
| IDD_PDOWN_RET_0V7 | 2.52uA | 2.89uA | N/A | N/A |
| IDD_DPOWN_32K | 1.28uA | 1.55uA | 5.6ms | 5.6ms |
Include FAQs here if appropriate. If there are none, then state "No FAQs have been identified for this project".
Provide URLs for help here.
Questions regarding the content/correctness of this example can be entered as Issues within this GitHub repository.
Warning: For more general technical questions regarding NXP Microcontrollers and the difference in expected funcionality, enter your questions on the NXP Community Forum
| Version | Description / Update | Date |
|---|---|---|
| 1.0 | Initial release on Application Code Hub | May 21th 2024 |