EVALSTPM33 Datasheet, PDF (2/5 Pages) STMicroelectronics – IEC61000 standard compliant

Schematic diagrams
1
Schematic diagrams
Figure 1. RS232/UART circuit schematic
EVALSTPM33
J1
RS-232 DB9
C1
100n
C2
100n
C3
100n
C4
100n
13
12
8 ^R1IN
R1OUT ₉
R2IN
R2OUT
U1
10
11 ^T2IN
T1IN
14
T1OUT ₇
T2OUT
1
3 ^C1+
4 ^C1-
5 ^C2+
2 ^C2-
6 ^V+
V-
16
VCC
15
GND
MAX3232/SO
C5
100n
1 RXD
2 TXD
3 +3.3VDC
4 GND
NOTE: always provide supply
for both RS232 and UART
J2
UART I/O
C6
100n
U2
1
8
2 ^VDD1
VDD2 ₇
3 ^{A1-in B1-out}
6
4 ^{A2-out B2-in}
5
GND1 GND2
Si8621
Vcc
C7
100n
Vcc
ALL SWs OFF SELECT SPI AT POWER UP
ALL SWs ON SELECT UART AT POWER UP
SW1
RXD
TXD
SCS
SW DIP-3
R1
10K
J3
RS-232 enable
GALVANIC ISOLATION
GIPG25032014DI1530
2/5
DocID026139 Rev 1