STMicroelectronics STM32G081B-EVAL User Manual page 56

100nF
C49
C45
100nF
USART1_RTS_3V3
Bootloader_BOOT0_3V3
Bootloader_RESET_3V3
PA11
USART1_CTS_3V3
SB28
USART1_TX_3V3
PC5 1 1
USART1_RX_3V3
2 2
PA10 3 3
USART1_RX_BOOT_3V3
JP8 JP14
PA9 3
USART1_TX_BOOT
2
PC4 1
USART1_TX
PA12 SB16 JP10
USART1_RTS
R40
100K
VDD
Figure 36. STM32G081B-EVAL RS232 and RS485
+3V3
U13 C52
28 26 100nF
C1+ VCC
24 25
C1- GND
1 27 C48
C2+ V+
2 3 100nF
C2- V-
C44
14 9 100nF
T1IN T1OUT
13 10
T2IN T2OUT
12 11
T3IN T3OUT
21
R1OUTB
20
R2OUTB
19 4
R1OUT R1IN
18 5
R2OUT R2IN
17 6
R3OUT R3IN
16 7
R4OUT R4IN
15 8
R5OUT R5IN
+3V3
23 22
nEN nSHDN
ST3241EBPR
C30
C29 VDD U8 +3V3 100nF
100nF 1 8
VCCA VCCB
2 7 USART1_TX_3V3
A1 B1
3 6 USART1_RTS_3V3
A2 B2
4 5 RS485_DIR
GND DIR
R42 SN74LVC2T45DCUT VDD
100K
CN11
DB9-male USART1
1
DSR 6 USART1_RTS_3V3
RXD 2 RS485_DIR
RTS 7
TXD 3
CTS 8
4 R81
9 10K
5
connector for USART1 & RS485
Title:
Project:
Variant:
Revision:
Size:
U15 +3V3 SB29
R77 22K
1 8
RO Vcc
2 7
RE B
3 6
DE A
R85 22K
4 5
DI GND
SB31
ST3485EBDR
C63 SB32
R82
120
100nF
SB30
RS232_RS485
STM32G081B-EVAL Mother board
Variant name is not interpreted until output
B 01 - Reference: MB1350
A4 Date: 31-AUG-17 Sheet: 9 of 12