NXP Semiconductors LPCXpresso54608 - Shield board current measurement; Board peripheral connections; LPC546 x8;540 xx;54 S0 xx USART ports and VCOM support

NXP Semiconductors
UM11035
LPCXpresso boards for LPC546xx/LPC540xx/LPC54S0xx families of
MCUs
UM11035
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User manual
Rev. 2.1 — 7th January 2019
21 of 36
the Link2 processor and is not user programmable. Power measurement utilities to use
this feature are available in LPCXpresso and IDE MCUXpresso IDE installations.
Due to input offset voltage variations in the MAX9634, the current measurement circuit is
not recommended for measuring current below 150 uA. See Fig 5 as a guideline for
measurement error versus measured current.
Fig 5. Current measurement circuit error
6.1.4 Shield board current measurement
To use the on-board current measurement circuitry, any expansion board must match the
functionality of the LPCXpresso546x8/540xx/54S0xx. Refer to the board schematics for
more information.
7. Board peripheral connections
7.1 LPC546x8/540xx/54S0xx USART ports and VCOM support
The LPCXpresso546x8/540xx/54S0xx board provides access to USART connections
from Flexcomm4 at the expansion connector J13.
% Error
LPC546xx current (µA)
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