■
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
TCON [5]
I
126
TCON [5]
(2), (3), (5)
TCON [7]/PWM1
IO
125
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
GNDK: 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
B.
MTV312M64
POWER CONFIGURATION
15
ViewSonic
Corporation
Co
nfidential
-
Do
Not
Copy
VE710s/b-2
VA721
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.
Pins specified as “CMOS output pin” can sink and drive at least 4mA current. It is not recommended to use such
pins as input pins.
Pins specified as “open drain pin” can sink at least 4mA current but only drive 10~20uA to VDD. They can be
used as input or output pins, and require an external pull up resistor.
A “8051 standard pin” is a pseudo open drain pin. It can sink at least 4mA current when the output signal is low,
drives at least 4mA current for 160nS when the output signal transits from low to high, then continues driving at
100uA to maintain the pin at the high level. It can be used as an input or output pin. It requires an external pull up
resistor when driving a heavy load.
The MTV312M uses a 5V or 3.3V power supply.
In a 5V power system, the VDD pin is connected to the 5V source and VDD3 requires an external capacitor, and all
output pins can swing from 0~5V. The input pins can accept an input range of 0~5V, but the X1 and X2 pins must
be kept below 3.3V.
Also, the ADC conversion range is 5V.
In a 3.3V power system, VDD and VDD3 are connected to the 3.3V source, and all output pins swing from
0~3.3V. HSYNC, VSYNC and open drain pins can accept an input range of 0~5V, but all other pins must be kept
below 3.3V. Also, the ADC conversion range is 3.3V.
