Limitations; Operating Voltage; Rs-232 Lpuart; Virtual Com Port - ST STM32L073Z-EVAL User Manual

UM1878
Jumpers and resistors
2 and 3 connected
(default setting)
JP9
1 and 2 connected
7.9.3

Limitations

RS-232 from USART2 and IrDA are exclusive.
7.9.4

Operating voltage

RS-232 from USART2 and IrDA are operating on the whole V
3.6 V.
7.10

RS-232 LPUART

LPUART signals RX, TX, RTS, CTS are available at DB9 connector CN7 located on the
right side of the board. The LPUART can be used on the whole voltage range of V
because level shifters are used.
7.10.1 Limitations
LPUART is exclusive with LCD glass. LCD glass module should be mounted in I/O position.
7.10.2

Operating voltage

LPUART is operating over the whole V
7.11

Virtual Com Port

RX and TX of USART4 are available in a USB Virtual Com Port managed by the ST-
LINK/V2-1. The USB connector of ST-LINK/V2-1 is CN17. Virtual Com Port can be used
over the whole operating voltage range of the microcontroller because level shifters are
used.
Table 8. RS-232 and IrDA jumper settings
RS-232 use:
DB9 connector CN9 RXD signal is connected to PD6 of STM32L073VZT6
used as USART2 RX.
IrDA use:
RxD pin of IrDA transceiver U14 is connected to PD6 of STM32L073VZT6
used as IrDA Rx.
UM1878 Rev 2
Hardware layout and configuration
Description
range (1.65 V to 3.6 V).
DD
voltage range: 1.65 V to
DD
DD
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