LPC5536
Target MCU
Debugger MCU
MCU-Link
Voltage
translator
USART
connector JP3
Voltage
translator
Motor 2 +
Arduino socket
connector J122
FC0
FC2
mikroBUS socket
connector J8
Figure 6. USART diagram
The table below explains the LPC55S36-EVK USART connections.
Table 13. LPC55S36-EVK USART connections
Flexcomm module
Voltage translator
Connector / MCU-Link target
FC0
Bidirectional voltage translator U22
(74AVC4TD245BQ). It supports a USB-to-UART
bridge between MCU-Link and the target MCU,
by shifting voltage levels of signals between the
two devices from 3.3 V to 3.3/1.9 V and vice
versa. The USB-to-UART bridge can be disabled
(so that the target MCU USART port can be
used for other purposes) by shorting jumper
JP26.
MCU-Link target (LPC55S69). The USB-to-
UART bridge between MCU-Link and the target
MCU can be used for debugging the target MCU
from MCU-Link.
Bidirectional voltage translator U11
(74AVC4TD245BQ). It creates an external
UART connection from USART connector JP3,
by shifting voltage levels of signals between JP3
and the target MCU from 3.3 V to 3.3/1.9 V and
vice versa. Before using this connection, short
jumper JP26 to disable the USB-to-UART bridge
between MCU-Link and the target MCU. The
UART connection is disabled by default. It can
be enabled by opening jumper JP12.
USART connecter JP3. It is a 1x3 pin header
with the following pinout:
• Pin 1: FC0_RXD
• Pin 2: FC0_TXD
• Pin 3: Ground (GND)
JP3 supports an external UART connection using
a USB-to-serial cable. It operates at 3.3 V.
To prevent the board from powering up using the
USB-to-serial cable, power on the board before
connecting the USB-to-serial cable.
Table continues on the next page...
NXP Semiconductors
LPC55S36-EVK Functional Description
LPC55S36-EVK Board User Manual, Rev. 1, 24 January 2022
User Manual
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