NXP Semiconductors
KW45B41Z-EVKUM
KW45B41Z-EVK Board User Manual
In the KW45B41Z-EVK board, MCU-Link is connected to the LPSPI1 port of the target MCU using
peripheral chip select 3 (PCS3) connection, through a voltage translator U24. The voltage translator enables
communication between MCU-Link and the target MCU, by shifting voltage levels of signals between the two
devices from 3.3 V to VCC_TGMCU and vice versa.
MCU-Link is also connected to the LPI2C1 port of the target MCU through a voltage translator (I2C repeater)
U27. The voltage translator enables communication between MCU-Link and the target MCU, by shifting voltage
levels of signals between the two devices from 3.3 V to VCC_TGMCU and vice versa.
To use MCU-Link as a USB-to-SPI or USB-to-I2C bridge, the board must be connected to the host computer
through a USB cable from its J14 connector. A USB-to-SPI bridge can be used to emulate the host system. A
USB-to-I2C bridge can be used to emulate the host system / board peripherals.
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 SPI by disabling voltage translator U24 (setting it to high-impedance).
By default, U24 is disabled (jumper JP34 is shorted); therefore, the USBSIO feature is disabled for SPI. The
feature can be enabled by opening jumper JP34. Shorting/opening JP34 after powering up the board has no
impact on the functions/features of the MCU-Link firmware. When USBSIO feature is disabled for SPI, then the
target MCU SPI port can be used for other purposes.
The USBSIO feature can be disabled for I2C by opening jumper JP30.
3.8 Measuring target MCU power consumption
The KW45B41Z-EVK board includes circuitry to measure voltage, current, and power/energy consumption for
the target MCU (KW45B41Z) by 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 3.2.
The power measurement feature is intended for low power measurements, with the target MCU running at up to
3.6 V. The design uses the built-in 16-bit ADC of the MCU-Link, with power data sampled at up to 100 kS/s. At
high sample rates, MCUXpresso IDE fails to capture all data; therefore, you must adjust the sample rate using
the configuration options available in the energy measurement configuration settings of the tool.
When MCU-Link is powered on, the measurement circuit initiates self-calibration. No user intervention is
needed for setting up calibration or adjusting measurement ranges.
Table 22 shows current measurement configuration settings. The maximum measurable current is 50 mA.
Accuracy may vary with temperature and it is only mentioned for reference purposes.
Measurement range Resolution Accuracy (typical)
200 nA to 400 μA 200 nA 1%
> 400 μA to 50 mA 5 μA 1%
Table 22. Current measurement configuration settings
The KW45B41Z-EVK board supports current measurement for target MCU (KW45B41Z) power domains using
onboard MCU-Link current measurement circuit. Onboard current measurement is supported for power supplies
in the range 1.7 V – 3.6 V.
KW45B41Z-EVKUM All information provided in this document is subject to legal disclaimers. © 2023 NXP B.V. All rights reserved.
User manual Rev. 2 — 13 February 2023
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