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654321
DATE:LTR ECO NO: APPROVED:
REVISION RECORD
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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
Ensure large area of copper is used as heatsink for Q4
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 (R10) - 2.75V (white LED backlight) = 2.35V
2.35V * 55mA = 130mW
R21 = (Vbe / I) = (0.66V / 55mA) = 12 Ohms
(Vbe was measured in a VC0 sample to be .66V, so that voltage will be assumed to be nominal)
(Backlight current in AD24 measured to be 55mA, and we desire to match AD32 backlight brightness to AD24)
Dissipation at accidental 9VDC input will be about 300mW
Place R52 near micro
LCD CONTRAST
AD32 MAIN PCB
LCD
8/24/2007R.E./I.F/J.B/M.S.
9-40-0455-B
9-79-0455-B-0
36
1
AD32MNB00A.sch
Copyright (c) 2007 Akai Digital Ltd.
*
DNS
* Provide plenty of copper for heat sinking for case of over voltage adapter
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
J2
BL109-18RU
R68
100k
Q9
MBT4401
R83
470
Q8
MBT4401
R84
10k
C73 0.1uF
Q10
MBT4403
Q4
MBT4403
Q3
MBT4403
R66
10k
R69
33k
R67
100k
C60
0.1uF
C69 1000pF
R81
12 ohm
1
OUT
2
IN
3
GND
U12
NJU7223DL1-33
TP6
TP8
TP2
C72
0.1uF
C67
0.1uF
G
DS
U10-A
FDC6306P
R78 0 ohm
C68
100uF
C71
4.7uF,25V
1
2
3
Q5
MBT4403
R74
1k
R79
1k
R76 1k
C62
0.1uF
C66 0.1uF
R77
820k
G
DS
U10-B
FDC6306P
C61
1uF
D19
12V
C70
0.1uF
D20
12V
C90
0.1uF
D31
SMAJ10A
+5V UNREG
LCD_E
LCD_RW
LCD_RS
+3V3
+3V3
POWER_EN
+3V3+3V3
LCD_CONTRAST
LCD/LED_DATA[0:7]
LCD/LED_DATA7
LCD/LED_DATA6
LCD/LED_DATA5
LCD/LED_DATA4
LCD/LED_DATA3
LCD/LED_DATA2
LCD/LED_DATA1
LCD/LED_DATA0
+3V3
+3V3_FULL
POWER_EN
+5V UNREG
+VIN