Schematic

USB VIN ONLY ON VBUS/VCC
CUT TRACES ON SJ2 AND SJ3
TO DISCONNECT LEDS
CUT TRACE ON SJ1 TO SWITCH
VOUT FROM 5V TO 3.3V
DO NOT CONNECT ALL THREE PADS
ON SJ1 AT THE SAME TIME!
FTS31XS-U
0.1uF
47pF47pF
27
27
GNDGND GND
USB-MICROB"
GND
0.1uF
GND
VCC
VCC VCC
GND GND
GND
3.3V
VCC3.3V
VCC
10uF
RED
Yellow
1K 1K
3.3V3.3V
2N7002PW
10k 10k
3.3V
GND
VCC
3.3V
VCC
15
VCCIO
3
3V3OUT
13
USBDM
12
USBDP
11
RESET
14
GND
6
GND
16
TXD
20
CBUS3
19
CBUS2
10
CBUS1
17
CBUS0
18
RI
5
DCD
8
DSR
7
DTR
1
CTS
9
RTS
2
RXD
4
U1
C2
C3C4
R1
R2
D+1
D-1
VBUS1
GND1
ID1
SHIELD1*3
JP1
C5
JP3
1
2
3
4
5
6
SJ1
C1
D1 D2
R3 R4
SJ2 SJ3
1
2
3
4
5
6
7
JP2 JP4
1
2
3
4
5
6
7
Q1
R5 R6
CTS
CTS
CTS
TXD
TXD
TXD
RXD
RXD
RXD
DTR DTR
CBUS3
CBUS3
TXLED
TXLED
RXLED
RXLED
CBUS0
CBUS0
RI
RI
DCD
DCD
DSR
DSR
RTS
RTS
RESET
RESET
VOUT
VOUT
VOUT
V11
Jim Lindblom
Revised by: Patrick Alberts
Released under the Creative Commons
Attribution Share-Alike 4.0 License
https://creativecommons.org/licenses/by-sa/4.0/
Design by:
USB B