![background image](http://html1.mh-extra.com/html/viewsonic/vg921m-4-vs11369/vg921m-4-vs11369_service-manual_1021245032.webp)
ViewSonic Corporation
Confidential - Do Not Copy
VG921m-4
29
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
C, MTV512M
The MTV512M micro-controller is an 8051 CPU core
embedded device especially tailored for flat panel
display applications. It includes an 8051 CPU core,
768-byte SRAM, 4 channels of 6-bit ADC, 3 external
counters/timers, 6 channels of PWM DAC, VESA
DDC interface, and a 64K-byte internal program
Flash-ROM memory in 44-pin PLCC package
FEATURES
• 8051 core, 12MHz operating frequency with
single/double CPU clock option
• 0.35um process; 3.3V power supply
• 768-byte RAM; 64K-byte program Flash memory
• Maximum 6 channels of PWM DAC
• Compliant with VESA DDC1/2B/2Bi/2B+ standard
• Dual slave IIC addresses; two H/W auto transfer
DDC1/DDC2x data for both D-sub and DVI
interfaces
• Watchdog timer with programmable interval
Summary of Contents for VG921m-4 VS11369
Page 35: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 32...
Page 36: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 33...
Page 39: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 36...
Page 40: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 37...
Page 41: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 38...
Page 48: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 45 Setp4 3 Check the DDC...
Page 56: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 53 16 Take off the bezel...
Page 78: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 75 11 PCB Layout Diagrams...
Page 79: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 76...
Page 80: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 77...
Page 81: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 78...
Page 82: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 79...
Page 83: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 80...
Page 84: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 81...