![background image](http://html1.mh-extra.com/html/viewsonic/va703b-4/va703b-4_service-manual_1020947026.webp)
ViewSonic Corporation
23
Confidential - Do Not Copy
VA703b-4_VA703m-4
DDC Channel: 4 pins
Name
I/O
Pin No Description
Note
DDCSCL / TCON [0] /
BBLU [1]
I
46
DDC serial control I/F clock / TCON [0] /
TTL BBLU [1]
(2), (3), (5)
DDCSDA / TCON [1] /
PWM1 / BBLU [0]
IO
47
DDC serial control I/F data input / output
/ TCON [1] / PWM1 / TTL BBLU [0]
(1), (2), (3), (5), (6),
(8)/ 8mA /no slew
DDCSCL2 (HDCP) /
TCON [5]
I
126
DDC serial control I/F clock / TCON [5]
(2), (3), (5)
DDCSDA2 (HDCP) /
TCON [7] /PWM1
IO
125
DDC serial control I/F data input / output
/ TCON [7] / PWM1
(1), (2), (3), (5), (6),
(8)/ 8mA /no slew
Power & Ground: 22 pins
Name
I/O
Pin No
Description
3.3V Power
P
49,121
VCCIO: 2
3.3V Ground
G
48,120
GNDIO: 2
3.3V Power
P
58,71,83,95,110
PVCC: 5
3.3V Ground
G
57,72,84,96,109
PGND: 5
2.5V Power
P
45,69,98,127
VCCK: 4
2.5V Ground
G
44,70,97,128
GNDIK: 4
Note: (1) TTL compatible CMOS Input (Vt=1.7V); VCC=3.3V;
(2) 5V tolerance pad;
(3) Internal 75K Ohms pull high resistor.
(4) Internal 75K Ohms pull low resistor.
(5) Schmitt trigger CMOS Input (Vt=1.4-~2.2V);
(6) Open-Drain, Output Drive low & Pull-high.
(7) Bi-directional input/output
(8) Programmable driving current (2~10mA)
(9) TTL output 5V & 3.3V
(10) 4V tolerance pad
Summary of Contents for VA703b-4
Page 29: ...ViewSonic Corporation 26 Confidential Do Not Copy VA703b 4_VA703m 4...
Page 30: ...ViewSonic Corporation 27 Confidential Do Not Copy VA703b 4_VA703m 4...
Page 35: ...ViewSonic Corporation 32 Confidential Do Not Copy VA703b 4_VA703m 4...
Page 36: ...ViewSonic Corporation 33 Confidential Do Not Copy VA703b 4_VA703m 4...
Page 41: ...STEP5 DCC WRITTEN methods ViewSonic Corporation 38 Confidential Do Not Copy VA703b 4_VA703m 4...
Page 87: ...ViewSonic Corporation 83 11 PCB Layout Diagrams Confidential Do Not Copy VA703b 4_VA703m 4...
Page 88: ...ViewSonic Corporation 84 Confidential Do Not Copy VA703b 4_VA703m 4...
Page 89: ...ViewSonic Corporation 85 Confidential Do Not Copy VA703b 4_VA703m 4...
Page 90: ...ViewSonic Corporation 86 Confidential Do Not Copy VA703b 4_VA703m 4...
Page 91: ...ViewSonic Corporation 87 Confidential Do Not Copy VA703b 4_VA703m 4...