NXP Semiconductors arm LPCXpresso55S36, Руководство пользователя

Страница: 41 / 46

NXP Semiconductors
LPCXpresso55S36UM
LPCXpresso55S36 Development Board User Manual
a free host library from NXP for Windows/Linux/MacOS systems. For more details on the
libusbsio library, see https://www.nxp.com/libusbsio .
The USB-to-GPIO bridge can be used to control a limited number of GPIO pins of
LPC55S69. The LPCXpresso55S36 board supports a 1x6 pin GPIO header J133 (not
populated on the board) for accessing these GPIO pins on the board. The table below
lists the LPC55S69 GPIO pins that can be controlled through USB-to-GPIO bridge and
shows how these pins are mapped to GPIO header pins.
LPC55S69 pin GPIO header J133 pin Signal direction
PIO1_1 Pin 1
Output from MCU-Link
PIO1_9 Pin 2
Output from MCU-Link
PIO1_20 Pin 3
Input to MCU-Link
PIO1_21 Pin 4
Output from MCU-Link
PIO1_31 Pin 3
Output from MCU-Link
PIO1_7
Pin 6 Input to MCU-Link
Table 26. USB GPIO pin assignments
3.8 Measuring target MCU power consumption
The LPCXpresso55S36 board includes circuitry to measure voltage, current, and power/
energy consumption for the target MCU (LPC5536) 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.
The table below 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 27. Current measurement configuration settings
In the LPCXpresso55S36 board, the onboard MCU-Link is used to measure the current
drawn by the target MCU. For current measurement, the supported voltage range is 1.7
V – 3.6 V. By default, current measurement is disabled on the board.
LPCXpresso55S36UM All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 2 — 5 September 2022
41 / 46