SHEET: OF 5
9-79-0452-F-0
9-40-0452-F
AD49TRF00J.sch
7/14/2009
2
R.E./I.F/J.B/M.S.
AKAI
3
REV:
SIZE:
B
FILENAME:
ASSY NUMBER:
PART NUMBER:
TITLE:
DRAWN:
LTR
C
B
A
C
D
6 5 4 3 2 1
DATE:
D
B
A
RELEASED: DATED:
DATED:
ECO NO: APPROVED:
REVISION RECORD
SCALE:
COMPANY:
AD49 TOP RIGHT PCB
If the Alesis PCB decal is used this is not necessary as the
with respect to the connector at the other end
Note that it would normally be necessary to reverse the pin out
FFC connector 1mm pitch.
connections are reversed in the decal
TO LCD
I/O
TO
TOP
LEFT
PCB
TO
MAIN
PCB *
* Pin order reversed vs. main board connector.
TO
MAIN
PCB *
Ensure large area of copper is used as heatsink for the output transistor
Datasheet recommends 1.6" x 1.6" for 350mW at 25 deg. C
Max dissipation will be about 130mW:
6V (DC input) - 0.3V (Schottky Diode) - 0.6V (R_feedback) - 2.75V (white LED backlight) = 2.35V
2.35V * 55mA = 130mW
R_feedback = (Vbe / I) = (0.66V / 55mA) = 12 Ohms
(Vbe was measured in a VC0 sample to be .66V,
(Backlight current in AD24 measured to be 55mA,
Dissipation at accidental 9VDC input will be about 300mW
so that voltage will be assumed to be nominal)
and we want to match backlight brightness across the various USB controller products)
DNS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
J3
GFP-231221-21802G
R10
100k
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
J4
GFP-231221-22602G
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
J1
GFP-231221-22602G
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
J2
GFP-231221-1222G
Q1
MBT4401
R11
470
Q2
MBT4401
R12
12 ohm
C350.1uF
R1
10k
C17 0.1uF
Q4
MBT4403
Q3
MBT4403
C77
0.1uF
C78 1000pF
D27
SMAJ10A
C79
0.01uF
C82
470uF,10V
+5VUNREG
LCD_E
LCD_RW
LCD_RS
+3V3
LCD/LED/FPGA_DATA[0:7]
LCD/LED/FPGA_DATA0
LCD/LED/FPGA_DATA1
LCD/LED/FPGA_DATA2
LCD/LED/FPGA_DATA3
LCD/LED/FPGA_DATA4
LCD/LED/FPGA_DATA5
LCD/LED/FPGA_DATA6
LCD/LED/FPGA_DATA7
BTN_SCAN7
BTN_SCAN8
BTN_SCAN9
BUTTON_COLUMN1
BUTTON_COLUMN0
BUTTON_COLUMN2
+3V3
ANALOG_TOP
PAD_RETURN0
PAD_RETURN1
PAD_RETURN2
PITCH
MOD
FULL_LEVEL_LED
12_LEVEL_LED
ARP_LED
LATCH_LED
NOTE_REPEAT_LED
LCD/LED/FPGA_DATA[0:7]
LCD/LED/FPGA_DATA0
LCD/LED/FPGA_DATA1
LCD/LED/FPGA_DATA2
LCD/LED/FPGA_DATA3
LCD/LED/FPGA_DATA4
LCD/LED/FPGA_DATA5
LCD/LED/FPGA_DATA6
LCD/LED/FPGA_DATA7
BTN_SCAN_SEL[0:3]
BTN_SCAN_SEL0
BTN_SCAN_SEL1
BTN_SCAN_SEL2
BTN_SCAN_SEL3
BUTTON_COLUMN[0:3]
BUTTON_COLUMN0
BUTTON_COLUMN1
BUTTON_COLUMN2
BUTTON_COLUMN3
ANALOG_SELECT[0:2]
ANALOG_SELECT0
ANALOG_SELECT1
ANALOG_SELECT2
+5VUNREG
+3V3
+3V3_FULL
ANALOG[0:2] ANALOG0
ANALOG1
ANALOG2
PAD_RETURN[0:2] PAD_RETURN0
PAD_RETURN1
PAD_RETURN2
ANALOG_TOP
PITCH
MOD
ENC_A
ENC_B
LCD_CONTRAST_DC
LCD_RS
LCD_RW
LCD_E
TAP_TEMPO_LED
LCD_CONTRAST_DC
PAD_SCAN_SEL[0:1]
PAD_SCAN_SEL0
PAD_SCAN_SEL1
PAD_SCAN_SEL[0:1]
PAD_SCAN_SEL0
PAD_SCAN_SEL1
POWER_EN
POWER_EN
+3V3
POWER_EN
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