NXP Semiconductors
UM10855
LPCXpresso board for LPC54100 family of MCUs
UM10855_OM1377.docm
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© NXP B.V. 2014. All rights reserved.
User manual
Rev. 1.0
— 4th November 2014
11 of 19
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Figure 6 - Measuring LPC54102 VDD current with current meter
5.1.4
LPC54102 VDD current measurement
The LPCXpresso54102 board has an on-board current measurement circuit consisting of
a MAX9634T (U5) current monitor chip and a 12-bit ADC (ADC122S021, U11) with a 12-
bit sample at 50k to 200ksps. The on-board MAX9634T current monitor measures the
voltage across the LPC54102 VDD 8.2Ω vsense resistor. The MAX9634 multiplies the
sense voltage by 25 to provide a voltage range suitable for the ADC to measure. A 2-
input analog mux selects between the LPC54102 current monitor and the output on a
MAX9634T current monitor chip on an expansion board (with compatible current
measurement circuit on-board). The current measurement circuit is controlled by the
Link2 processor and is not user programmable. For available power measurement
utilities please visit http://www.lpcware.com.
5.1.5
Shield board current measurement
To use the on-board current measurement circuitry, any expansion board must match the
functionality of the LPCXpresso54102. Refer to the board schematics for more
information.
6. Debug Configurations
The LPCXpresso54102 LQFP board has a built-in debug probe using the Link LPC43xx
MCU. The LPC54102 target MCU can be debugged by the on-board Link debugging
probe, or from an external debug probe installed at P1. On-board jumpers JP1 and JP2
must be correctly positioned for each mode. The on-board Link debug probe is capable
of debugging target MCU’s with a VDDIO range of 1.6V to 3.6V. Use JP7 to set the
LPC54102 chip VDD to the desired voltage level (+1.8V or +3.3V). Check the sections
below for the appropriate jumper settings and how to properly power the board.
6.1.1
Debugging on-board LPC54102 target using on-board debug probe
To use the on-board Link debug probe, the LPCXpresso54102 board must be powered
from the Link2 USB connector J6, and jumper JP2 must be fitted in position pin 1 - 2
(Local Target), as shown in Figure 7. Jumper JP1 must be open to enable the target
LPC54102. Connecting the micro USB J6 to a host computer will power the Link and
Target sections of the board and provide the USB link to the debug tool software.