NXP Semiconductors
UM12036
MCX-N9XX-EVK Board User Manual
In the MCX-N9XX-EVK board, MCU-Link is also connected to the P4_[1:0] pins of the target MCU using the
FC2 I2C interface connection, through a voltage translator U23. The voltage translator enables communication
between MCU-Link and the target MCU, by shifting voltage levels of signals between the two devices from 3V3
to VDD_P4 and vice versa.
A USB-to-I2C bridge can be used to emulate the host system / board peripherals. To use MCU-Link as a USB-
to-I2C bridge, the board must be connected to the host computer through a USB cable from its J5 connector.
Also, ensure the following resistor and jumper configuration on the board:
• Zero-ohm resistors R46 and R47 are populated
• Jumper JP25 is shorted (to enable USBSIO bridge feature for I2C)
The USBSIO feature can be disabled for SPI or I2C so that the target MCU SPI/I2C port can be used for other
purposes. Disabling this feature instructs the firmware not to enumerate the USB endpoint for USBSIO (which is
called “MCU-Link LPCSIO” for backward compatibility reasons). Disabling the USBSIO feature also frees more
USB bandwidth for the SWO profiling and energy measurement features of MCU-Link.
The USBSIO feature can be disabled for I2C by opening jumper JP25.
3.10 Measuring target MCU power consumption
The MCX-N9XX-EVK board includes circuitry to measure voltage, current, and power/energy consumption
for the target MCU (MCX N94x) using the onboard MCU-Link debug probe. This measurement data can be
analyzed and displayed using MCUXpresso IDE version 11.5.1 or later. For more details on the MCUXpresso
IDE, see https://www.nxp.com/mcuxpresso/ide.
It is recommended to use the latest MCU-Link firmware. If the latest firmware version is not installed, then the
MCUXpresso IDE shows a message indicating that the firmware version is not the latest one. For instructions
on updating MCU-Link firmware, see Section 3.5.
The energy monitor circuit used on the MCX-N9XX-EVK board measures the current of all supplies on the
MCU_PWR net (only critical supplies are sourced by MCU_PWR). The following is the list of power supplies for
which current can be measured:
• Core supplies (DCDC_CORE input via VDD_DCDC net or LDO_CORE input via VDD_CORE net)
• System supply (LDO_SYS input via VDD_LDO_SYS_IN net, provided it is not bypassed by jumper JP36)
• VDD via VDD_MCU net
• VBAT Domain via VDD_BAT net
This allows for the measurement of all necessary power rails to be measured and allows for the measurement
of DCDC and LDO power modes.
Note: All of the above power rails must be at the same voltage level to be included in the measurement circuit.
To use the Energy Monitor circuit, jumpers JP29, JP33, JP32, and JP38 must be populated. JP38 can be used
to select either P3V3 or P1V8 nets to power MCU_PWR. This allows for 3.3 V or 1.8 V measurements to be
made.
For more information on the Energy Monitor circuit and its functionality, see the MCU-Link Pro standalone
debug probe user manual.
3.11 MCU-Link status LEDs
The MCX-N9XX-EVK board has seven status indicator LEDs for MCU-Link. Table 34 lists these LEDs and
describes how each LED behaves in different MCU-Link modes. These LEDs are shown in Figure 3.
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
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