Tcon [1] - ViewSonic VS10047 Service Manual

■ DDC Channel:4 pins
Name
DDCSCL/TCON [0] /
BBLU [1]
DDCSDA/TCON [1] /
PWM1/BBLU [0]
TCON [5]
TCON [7]/PWM1
■ Power & Ground:22 pins
Name
3.3V Power
3.3V Ground
3.3V Power
3.3V Ground
2.5V Power
2.5V Ground
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
B. MTV312M64
The MTV312M micro-controller is an 8051 CPU core embedded device especially tailored for CRT/LCD
Monitor applications. It includes an 8051 CPU core, 1024-byte SRAM, 14 built-in PWM DACs, VESA DDC
interface, 4-channel A/D converter, and a 64K-byte internal program Flash-ROM.
A "CMOS output pin" means it can sink and drive at least 4mA current. It is not recommended to use such
pin as input function.
A "open drain pin" means it can sink at least 4mA current but only drive 10~20uA to VDD. It can be used as input
or output function and needs an external pull up resistor.
A "8051 standard pin" is a pseudo open drain pin. It can sink at least 4mA current when output is at low level, and
drives at least 4mA current for 160nS when output transits from low to high, then keeps driving at 100uA to
maintain the pin at high level. It can be used as input or output function. It needs an external pull up resistor when
driving heavy load device.
POWER CONFIGURATION
The MTV312M can work on 5V or 3.3V power supply system.
In 5V power system, the VDD pin is connected to 5V power and the VDD3 needs an external capacitor, all
output pins can swing from 0~5V, input pins can accept 0~5V input range.
And ADC conversion range is 5V. However, X1 and X2 pins must be kept below 3.3V.
In 3.3V power system, the VDD and VDD3 are connected to 3.3V power, all output pins swing from 0~3.3V,
HSYNC, VSYNC and open drain pin can accept 0~5V input range, other pins must be kept below 3.3V. And the
ADC conversion range is 3.3V.
ViewSonic Corporation
I/O Pin No Description
I 46 DDC serial control I/F clock/TCON [0]/TTL
BBLU [1]
IO 47 DDC serial control I/F data input/ output/
TCON [1]/ PWM1/ TTL BBLU [0]
I 126 TCON [5]
IO 125 TCON [7]/ PWM1
I/O Pin No
P 49,121
G 48,120
P 58,71,83, 95,110
G 57,72,84,96,109
P 45,69,98,127
G 44,70,97,128
14
Description
VCCIO: 2
GNDIO: 2
PVCC: 5
PGND: 5
VCCK: 4
GNDK: 4
Confidential - Do Not Copy
Note
(2), (3), (5)
(1), (2), (3), (5),
(6), (8)/8mA/no
slew
(2), (3), (5)
(1), (2), (3), (5),
(6), (8)/8mA/no
slew
VE710s/b-2
VA721