Hardware layout and configuration UM1855
26/100 DocID027351 Rev 3
For configuration elements related with the RS-232 port operation, refer to Table 6 and
Table 9.
Section 2.10 brings information on using the LPUART port of STM32L476ZGT6 for RS-232,
instead of its USART1 port.
2.9.2 IrDA port
The IrDA communication port uses an IrDA transceiver (U11). Table 9 shows the
configuration elements related with the IrDA port operation
.
2.9.3 Limitations
The operation of RS-232 and IrDA ports is mutually exclusive. The operation of either port is
also mutually exclusive with the NFC peripheral operation.
2.9.4 Operating voltage
The RS-232- and IrDA-related operating supply voltage of STM32L476ZGT6 (VDD line)
must be within the range from 1.71 V to 3.6 V.
2.10 LPUART port
On top of USART1 port for serial communication, the STM32L476ZGT6 offers LPUART, a
low-power UART port.
Table 9. Settings of configuration elements for RS-232 and IrDA ports
Element Setting Description
JP15
JP15
Default setting.
RS-232 selected: PB7 port of STM32L476ZGT6 receives signal
originating from RXD terminal of CN9.
JP15
IrDA selected: PB7 port of STM32L476ZGT6 is connected with RxD
terminal of the IrDA transceiver U11.
JP15
NFC selected: PB7 port of STM32L476ZGT6 receives NFC_IRQOUT
signal from NFC peripheral. Section 2.28 provides more detail on the
NFC peripheral.
R93, R118,
R116
In Required for IrDA operation
R158, R119 Out Required for IrDA operation
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