Main Board Schematic
Circuit Boards
4
Debug
Reset
POWER & USB
MIDI_OUT
EMC CAPACITORS
MCU
PEDAL
Mark
Keyst
at
ion49 NC
Keyst
at
ion49
LED&FKEY
KEYBOARD
ON
OF
F
NC
NC
NC
NC
DNS
49
PA05/ADC5
50
PA06/ADC6
51
PA07/ADC7
52
AVDD
53
CPN0/PC07
54
CPP0/PC06
55
CPN1/PC15
56
CPN1/PC14
57
INT1/PB15
58
XT1_OUT
59
XT1_IN
60
RESET
61
VSS1
62
VDD1
63
PVSS
64
STD/TM0/PB08
32
PB09/TM1
31
PB10/TM2
30
PB11/TM3/PWM4
29
PE05/PWM5
28
PC00/SS00/I2SLRCLK
27
PC01/SPICLK0/I2SBCLK
26
PC02/MISO00/I2SDI
25
PC03/MOSI00/I2SDO
24
PB03/CTS0
23
PB02/RTS0
22
PB01/TX0
21
PB00/RX0
20
D+
19
D-
18
VDD33
17
VBUS
33
PC11/MOSI10
34
PC10/MISO10
35
PC09/SPICLK1
36
PC08/SS10
37
PA15/PWM3/I2SMCLK
38
PA14/PWM2
39
PA13/PWM1
40
PA12/PWM0
41
ICE_DAT
42
ICE_CK
43
AVSS
44
PA00/ADC0
45
PA01/ADC1
46
PA02/ADC2
47
PA03/ADC3
48
PA04/ADC4
16
VSS
15
VDD
14
LDO
13
CTS1/PB07
12
RTS1/PB06
11
TX1/PB05
10
RX1/PB04
9
I2CSDA/PA08
8
I2C0SCL/PA09
7
I2C1SDA/PA10
6
I2C1SCL/PA11
5
X32I
4
X32O
3
CLKO/CPO0/PB12
2
CPO1/PB13
1
INT0/PB14
U2
NUC120RD2BN
C9
20P
C10
20P
R1
1M
XT1
12M
R2
33R
R3
10K
C6
104
R4 10K
C2
104
C3
47
U
/6
.3
V
C4
104
C5
104
C7
47
U
/6
.3
V
R16
27R
R17
27R
C8
104
C11
470U
/10V
C12
104
C13
100U
/6.
3V
3
VIN
1
GND/ADJ
2
VOUT
U3
1117-3.3
FB3
C21
101
C22
101
C23
101
C24
101
C25
101
C26
101
C27
101
C28
101
C29
101
C30
101
C31
101
C32
101
C33
101
C34
101
C35
101
C36
101
C37
101
C38
101
C39
101
C40
101
C41
101
C42
101
C43
101
C44
101
C49
510P
C50
510P
C51
510P
FB5
FB6
1
2
3
4
J9
SU
ST
AI
N
C1
104
C53
47
U
/6
.3
V
1
VBUS
2
D-
3
D+
4
GND
5
SH1
6
SH2
J3
USB
1
2
3
4
J2
1
2
3
4
5
6
J1
L11
D2
SS24
D13
5V/0.
15PF
D14
5V/0.
15PF
D15
5V/0.
15PF
1
2
3
DJ1
1
VIN
2
GND
3
VOUT
U4
7805
D3
1N
4001
C4
6
104
C4
7
470U
/16V
C4
8
104
C5
2
470U
/10V
D4
SS24
D1
6
5V/
0.
15PF
D1
7
5V/
0.
15PF
VD
D
_5V_
TEST
C58
100U
/6.
3V
C60
104
RESET
C63
104
C67
104
C68
47
U
/6
.3
V
C70
47
U
/6
.3
V
MK
1
MK
2
MK
3
MK
4
C71
104
C72
104
C78
104
C79
DNS
C80
DNS
R28
1M
3
4
12
L54
TC
623-30uH
3
4
12
L2
TC
623-30uH
L6
D
LW
21H
N
121SQ2
1
2
3
4
5
6
7
8
AR1
4.7K
1
2
3
4
5
6
7
8
AR3
4.7K
1
2
3
4
5
6
7
8
AR4
4.7K
1
2
3
4
5
6
7
8
AR2
4.7K
R7
0R
1
2
3
4
5
6
7
8
9
10
11
12
J7
HIG
H
1
2
3
4
5
6
7
8
9
10
11
12
13
J8
LOW
R8
0R
D1
1N
4148
R15
0R
1
2
3
4
5
6
7
8
AR5
4.7K
R19
10K
R67
10K
R20
10K
R21
10K
R22
10K
12
34
56
78
91
0
11
12
13
14
15
16
17
18
19
20
J10
Connect to FB
R5
68R
R1
1
68R
L3
L5
L4
T1
T4
C5
5
104
1
2
3
4
5
6
7
J4
MS-CON-MIDI_JACK
MIDI_OUT
D5
5V/
0.
15PF
D6
5V/
0.
15PF
D7
5V/
0.
15PF
C5
4
104
C5
6
100U
/16V
C5
7
DNS
C5
9
DNS
C61
104
R26
1M
B
E
C
Q1
8050
B
E
C
Q2
8550
R1
3
10K
R23
4.7K
R2
4
4.
7K
R25
10K
R6
4.7K
1
2
3
4
5
6
SW1
C17
104
C1
5
47U
/6.
3V
FB
4
FB1
FB2
FB7
FB8
L1
C16
104
C14
100U
/6.
3V
3
VCC
1
/RESET
2
GND
U1
PLD
3025C
TA
KEY-T01
KEY-T02
KEY-T03
KEY-T00
KEY-T07
ICEDAT
ICECLK
RESET
VDD_3.3V
XT1-OUT
XT1-IN
VDD_3.3V
RESET
XT1-OUT
XT1-IN
RESET
VDD_3.3V
AVDD_3.3V
PW
R
_U
SB_
VBU
S
U
SB_
D
-
U
SB_
D
+
ICEDAT
ICECLK
VD
D
_3.
3V
VOLUME
PITCHBEND
MODULATION
KEY-T04
KEY-T05
KEY-T06
KEY-MK00
KEY-BR00
KEY-MK01
KEY-BR01
KEY-MK02
KEY-BR02
KEY-MK03
KEY-BR03
KEY-MK04
KEY-BR04
KEY-MK05
KEY-BR05
KEY-MK06
KEY-BR06
KEY-MK07
KEY-BR07
MIDI_OUT
KEYBOARD
MODU
LA
TION
VOLUM
E
PIT
CH
BEN
D
GND
AGND
MOD
U
LA
TI
ON
PI
TC
H
BE
N
D
KEY-MK00
KEY-BR00
KEY-MK01
KEY-BR01
KEY-MK02
KEY-BR02
KEY-MK03
KEY-BR03
KEY-MK04
KEY-BR04
KEY-MK05
KEY-BR05
KEY-MK06
KEY-BR06
KEY-MK07
KEY-BR07
KEY-T00
KEY-T01
KEY-T02
KEY-T03
KEY-T04
KEY-T05
KEY-T06
KEY-T07
VDD_3.3V
U
SB_
D
-
U
SB_
D
+
VDD_5V
AVDD_3.3V
VDD_3.3V
PLLGND
GND
GND
AGND
GND
GND
GND
GND
GND
GND
PLLGND
GND
AGND
AGND
GND
AGND
GND
AVDD_3.3V
GND
OCT_LED-_G
_R
_G
KEYBOARD
KEY-MK00
KEY-MK01
KEY-MK02
KEY-MK03
KEY-MK04
KEY-MK05
KEY-MK06
KEY-MK07
KEY-BR00
KEY-BR01
KEY-BR02
KEY-BR03
KEY-BR04
KEY-BR05
KEY-BR06
KEY-BR07
KE
YB
OA
RD
KE
Y-
MK00
KE
YB
OA
RD
KE
Y-
MK04
KEY-BR
04
KEY-M
K05
KEY-BR
05
KEY-M
K06
KEY-BR
06
KEY-M
K07
KEY-BR
07
KEY-T
04
KEY-T
05
KEY-T
06
KEY-T
07
KEY-BR
00
KEY-M
K01
KEY-BR
01
KEY-M
K02
KEY-BR
02
KEY-M
K03
KEY-BR
03
KEY-T
00
KEY-T
01
KEY-T
02
KEY-T
03
ADVANCE_LED
OCT_LED-_R
FKEY_IN00
FKEY_IN01
FKEY_IN02
FKEY_IN03
FKEY_T0
FKEY_T1
FKEY_T2
FKEY_T2
FKEY_IN03
FKEY
_IN
00
FKEY
_IN
01
FKEY
_IN
02
FKEY
_IN
03
GPIO_RESERVED_[0:31]
GPI
O
_R
ESER
VED
_0
GPI
O
_R
ESER
VED
_0
GPIO
_R
ESERVED
_1
GPIO
_R
ESERVED
_2
GPIO
_R
ESERVED
_3
GPIO
_R
ESERVED
_4
GPI
O
_R
ESER
VED
_1
GPI
O
_R
ESER
VED
_2
GPI
O
_R
ESER
VED
_3
GPI
O
_R
ESER
VED
_4
AVDD_3.3V
VOLUME
FKEY_T0
FKEY_T1
FKEY_T2
FKEY_IN00
FKEY_IN01
FKEY_IN02
FKEY_IN03
ADVANCE_LED
OCT_LED-_R
OCT_LED-_G
_R
_G
VD
D
_3.
3V
VDD_3.3V
VDD_3.3V
MIDI_OUT
GND
GND
PWR
_U
SB_VBU
S
UNUSED
welding R6 and Keystation 61 no need
