NAD C 720BEE - Page 15

R
Vdd
Din
Dout
CLK
STB
OSC
Serial I/F
Command decoder
Display memory
20bit x 16 word
Dimming circuit
20-bit output latch
Timing generator
key scan
key scan memory (4x20)
5-bit latch
4-bit latch
16-bit shift register
Data selector
Grid driver
Segment/grid driver
Segment driver
LED 1 LED 5
SW1
SW4
TO
4
Key1
Key4
TO
4
20 12
8
16
8
8
8
Seg1
Seg12
Seg13/grid16
Seg20/grid9
Grid 8
Grid 1
Vdd
(+5V)
Vss
(0V)
Vee
(-30V)
uPD16311
MAIN BOARD :IC703
PIN CONFIGURATION
(Top View)
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
27
28
29
30
31
32
33
34
35
36
37
38
39
40414243444546474849505152
Seg1/KS1
Seg2/KS2 Seg3/KS3 Seg4/KS4 Seg5/KS5 Seg6/KS6
Seg7/KS7
Seg8/KS8 Seg9/KS9
Seg10/KS10
Seg11KS11 Seg12KS12
Vdd
SW1
SW2
SW3
SW4
Dout
Din
IC
CLK
STB
KEY1
KEY2
KEY3
KEY4
Grid6
Grid7
Grid8
Seg20/Grid9
Seg19/Grid10
Vee
Vdd
Seg18/Grid11
Seg17/Grid12
Seg16/Grid13
Seg15/Grid14
Seg14/Grid15
Seg13/Grid16
OSC Vss
LED1 LED2 LED3 LED4 LED5 Vdd Grid1 Grid2 Grid3 Grid4 Grid5
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