NXP Semiconductors
LPCXpresso55S36UM
LPCXpresso55S36 Development Board User Manual
The table below shows the power supplies and jumpers corresponding to various
currents of the target MCU (LPC5536).
Target MCU current
Power supply
Jumper that drives power supply
IDD current (total current)
MCU_VCC_3V3_1V9
JP33 (shorted by default)
VDD current
MCU_VDD
JP20 (shorted by default)
VDDA current
MCU_VDDA
JP21 (shorted by default)
VBAT current
MCU_VBAT
JP22 (shorted by default)
VDD_MAIN current
MCU_MAIN
JP28 (shorted by default)
Table 28. Target MCU currents
For measuring the current drawn from a board power supply, the power supply is
connected in line with the current measurement circuit through jumpers JP74 and JP75.
By default, these two jumpers are shorted and they connect the MCU_VCC_3V3_1V9
supply (power supply corresponding to the total target MCU current (IDD)) to the current
measurement circuit.
To measure the total current drawn by the target MCU, configure the
MCU_VCC_3V3_1V9 supply as follows:
1. Open jumper JP33, which drives the MCU_VCC_3V3_1V9 supply. When JP33 is
shorted, the MCUXpresso energy measurement tool shows zero current because
the measurement circuit is bypassed (short circuited by JP33). When JP33 is open,
the energy measurement tool can read the MCU_VCC_3V3_1V9 supply current
correctly.
2. Ensure that jumpers JP74 and JP75 are shorted.
To measure an individual target MCU current (VDD, VDDA, VBAT, or VDD_MAIN),
configure the corresponding power supply as follows:
1. Ensure that jumper JP33 is shorted.
2. Open the jumper corresponding to the power supply.
3. Open jumpers JP74 and JP75.
4. Connect pin 1 of the power supply jumper to pin 2 of JP74.
5. Connect pin 2 of the power supply jumper to pin 2 of JP75.
3.9 MCU-Link status LEDs
The LPCXpresso55S36 board has seven status indicator LEDs for MCU-Link. The table
below lists these LEDs and describes how each LED behaves in different MCU-Link
modes.
MCU-Link mode
Part
identifier
LED name /
color
Normal mode (with CMSIS-DAP
firmware)
Normal mode (with J-
Link firmware)
Firmware Update (ISP)
mode
D14
USB / green
Lights up after successful USB
enumeration at startup. Afterward,
the LED stays ON.
Remains OFF
Remains OFF
D15
SWO / green
Indicates if serial wire debug
trace output (SWO) data is being
received from the target MCU
Remains OFF
Remains OFF
Table 29. MCU-Link LEDs
LPCXpresso55S36UM
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User manual
Rev. 2 — 5 September 2022
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