1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
Title
Number RevisionSize
A3
Date: 2014/2/12 Sheet of
File: D:\RD22\..\POWE R_IO-20130903.SchDoc Drawn By:
REV
Number of SheetsSheet Number
DRAWN_BY_1 Last Saved Date
File Name
ASSEMBLY_NUMBER
PART_NUMBER
TITLE_MAIN
Copyright
POWER & I/O
N/CN/C
N/C
MIDI IN
N/C
N/C
MIDI OUT
N/C
+3.3V
CURRENT LIMITER
VDP_SRC shall be able to source at least 250uA when D+ is between 0.5 and 0.7.
VDP_SRC shall not pull D+ below 2.2V when D+ is pulled to [3.0-3.6]V through [900-1575]ohms
VDP_SRC = 0.6V
0.33V ref
Locate close to USB input
Locate close to USB input
CHARGING PORT DETECTION
* Provide plenty of copper for heat sinking for case of over voltage adapter
For green/blue LEDs
Vo = Vref*(1+(RF/RG))
Vfb = 1.26V
Do Not Stuff
nominally 4.0V
VLE D_RGB
Power input is 6VDC
N/C
invert
USB CONNECT
forces EXT_CHARGER low
if CHECK_POWER low
TO
TOP
PCB
RIGHT
TO
TOP
PCB
RIGHT
LCD CONTRAST
(VLED)
Hold CHECK_POWER High to
maintain EXT_CHARGER High
PSU DETECTION
Vbus DETECTION
AKAI
ASSY NUMBER:
REVISION RECORD
APPROVED:ECO NO:LTR DATE:
123456
D
C
B
A
C
D
B
A
COMPANY:
TITLE:
PART NUMBER:
FILENAME:
SCALE:
RELEASED:
DRAWN: DATED:
DATED:
REV:
SIZE:
SHEET: OF
C
OUT
1
IN
2
GND
3
NJU7223DL1-33
U1
1
TP2
0.1uF
C4
1000pF
C14
1000pF
C12
220 ohmR18
1
2 3
MBT4401
Q2
220 ohm
R17
220 ohm
R16
10KR19
1000pF
C15
1000pF
C16
47 ohm
R20
0.1uF
C11
4.7uF,25V
C2
1
23
MBT4403
Q4
1K
R28
1K
R30
1K
R29
0.1uF
C20
0.1uFC19
820K
R31
0.1uF
C54
1
TP1
0.1uF
C18
0.1uF
C1
100uF,10V
C3
10K
R101
100 ohm
R102
0.1uF
C70
3 1
MMBD4148
D8
0.1uF
C163
0.1uF
C171
1
TP17
100uF, 10V
C165
100uF, 10V
C181
10K
R140
1.5K
R21
1
23
MBT4403
Q11
10KR44
0.1uF
C72
100 ohm R124A
100 ohm R124B
100 ohm R124C
100 ohm R124D
100 ohm R125A
100 ohm R125B
100 ohm R125C
100 ohm
R125D
100 ohm R131A
100 ohm R131B
100 ohm R131C
100 ohm R131D
1 2
FBMA-11-201209-601A20T
L3
0.1uF
C37
0.1uF
C55
100 ohm R130A
100 ohm R130B
100 ohm R130C
100 ohm R130D
1
23
MBT4403
Q5
0.1uF
C28
0.1uF
C22
100 ohm R126A
100 ohm R126B
100 ohm R126C
100 ohm R126D
100 ohm R129
100 ohm R127A
100 ohm R127B
100 ohm R127C
100 ohm R127D
100 ohm R52
100 ohm R51
100 ohm R57
100 ohm R65
100 ohm R68
10KR22
1.00k 1%R69
2.15k 1%R70
PAD_RET URN3
+5VUNREG
ANALOG0
ANALOG1
ANALOG2
PAD_RETURN0
PAD_RETURN1
PAD_RETURN2
GND_LED
ANALOG3
DATA7
DATA6
DATA5
DATA4
DATA3
DATA2
DATA1
DATA0
LCD_CONTRAST_DC
DATA[0..7]
PAD_RET URN[0..3]
ANAL OG[0..3]
GNDGNDGND
GND GNDGND GND GNDGND
MIDI_TX
MIDI_RX
+3V3
+3V3
GNDGND GND
GND GND
GND
GND GND
+3V3
GND GND
USB-
USB+
GND
GND
GND
+3V3
GNDGND
CHECK_POWER
+VLED_RGB
+3V3
GND
GND_LED
GND
GND
GND
+3V3
GND
+3V3
GND
EXT_PSU
EXT_CHARGERUSB_CONNE CT
+3V3
GND
GND
GND
ANALOG_TOP
+3V3
+5VUNREG
GNDGND
+3V3+3V3
LCD_CONTRAST
MOD_POT
PITCH_POT
ANALOG_SELE CT0
ANALOG_SELECT1
ANALOG_SELECT2
ANALOG_SELECT3
PAD_SCAN0
PAD_SCAN1
PAD_SCAN2
PAD_SCAN3
+VLED_RGB
GND
+5VUNREG
LED_EN
BUTTONS_IN
LEDS_OUT
SHIFT_CLK
LOAD_BUTTONS
LOAD_LEDS
LCD_E
LCD_RW
LCD_RS
BACKLIGHT_EN
EXT0
EXT1
EXT2
EXT3
EXT4
+3V3
VBUS_SENSE
+3V3
DATA[0..7]
PAD_RET URN[0..3]
MBRS140LT3
D6
MBRS140LT3
D10
1 3
D5
12V
1
65
DS
G
FDC6306P
U3A
3
42
DS
G
FDC6306P
U3B
1
2
3
BAW56
D13
1
2
3
BAW56
D4
VIN
1
ON/OFF
2
OUT
3
VADJ
4
5
GNDGND
OUT(TAB)
3
NJM2387
U59
1
2 3
4
U2
TLP181
1
2
3
4 5
6
7
8
J4
MIDI
1
2
3
45
6
7
8
J5
MIDI
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
18
17
19
20
21
22
23
24
25
26
J14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
18
17
19
20
21
22
23
24
25
26
27
28
29
30
J16
BAV99
D11
BAV99
D3
+
3
-
2
1
U5A
LM393
+
5
-
6
7
U5B
LM393
84
U5C
LM393
1
3
2
J7
P6
+VBUS
1
D-
2
D+
3
4
4
56
J6
DNS 0 ohm
R1007
0 ohm
R26
0 ohm
R13
0 ohm
R5
0 ohm
R32
0 ohm
R4
0 ohm
R100
806 ohm 1%
R135
475 ohm 1%
R136
10k 1%
R138
1.1k 1%
R137
8.06k 1%
R41
100k 1%
R40
1 2
L1
10uH
1 2
L2
10uH
1uF
C21
1uF
C177
1uF
C178
ANALOG[0..3]
1
2
3
4
5
6
SW1
10k 1%
R141
10k 1%
R6
10k 1%
R142
10k 1%
R8
12k 1%
R9
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