e)
Panel Power Sequencing (VDDCTRL1, 2) (Pin 32, 3): The MTV312 has two dedicated outputs
VDDCTRL1 and 2 ( Pin32 and Pin3) to control LCD power sequencing once data and control signals
are stable.
f)
Panel interface (Pin 1~25, Pin75~128) : The MTV312 driver interface is highly programmable. It supports dual bus /
dual port for SXGA drivers.
6.1.2 Power Regulator MC34063A (U6),AIC1739 (Q4): The MC34063A is a monolithic control IC
containing the primary functions required for DC to DC converters. The device consists of an internal temperature
compensated reference, a comparator, and a controlled duty cycle oscillator with an active current
sense circuit. The desired output voltage is determined by the equation, Volt = 1.25 ( 1 + R67 / R66).
In this case, the output voltage is 3.3 Volts. The AIC1563 is a low dropout positive adjustable
regulator with minimum of 1A output current capability, so it is well suited to serve as a 3.3 V or
2.5 V regulator.
6.1.3 Power Regulator MC34063A (U7): The MC34063A is a monolithic control IC containing the
primary functions required for DC to DC converters. The device consists of an internal temperature
compensated reference, a comparator, and a controlled duty cycle oscillator with an active current
sense circuit. The desired output voltage is determined by the equation, Volt = 1.25 ( 1 + R85 / R86).
In this case, the output voltage is 5.0 Volts for panel power.
d)
MTV312 Micro Controller: The MTV312 micro controller (MCU) serves as the system micro controller.
It programs the MST8111A and manages other devices in the system such as the keypad, the backlight, the
LED, the audio system and the non-volatile RAM using general purpose input/output (GPIO) pins.
Pin number
Pin Name
Pin Number Usage
21
P1.3
Key / Power on ,off
13
P3.4
NV_RAM (U4) SDA
14
P3.5
NV_RAM (U4) SCL
25 P1.7
Key_down
9 P6.3
Key_right
24 P1.6
Key_up
16 P6.2
Key_left
37 P4.1
Key_mute
34 P5.6
VGA
connector
23 P1.5
Key_select
42 P5.3
LED_red
41 P5.4
LED_green
32
P6.6
LCD panel power1 on / off control
3
P5.0
LCD panel power2 on / off control
36
P4.0
Backlight on / off control
ViewSonic Corporation
Confidential - Do Not Copy
VA721-2
23
Содержание VA721-2
Страница 34: ...Pattern 5 Pattern6 Pattern 7 Pattern 8 Pattern 9 ViewSonic Corporation Confidential Do Not Copy VA721 2 31...
Страница 36: ...7 Appendix A How to install the software for ISP ViewSonic Corporation Confidential Do Not Copy VA721 2 33...
Страница 51: ...1 No Power 6 Troubleshooting Flow Chart ViewSonic Corporation Confidential Do Not Copy VA721 2 48...
Страница 52: ...2 No Characters Missing Color 3 Always show NO SIGNEL ViewSonic Corporation Confidential Do Not Copy VA721 2 49...
Страница 59: ...8 Exploded Diagram And Spare Parts List ViewSonic Corporation Confidential Do Not Copy VA721 2 56...
Страница 65: ...12V MC34063 MC34063 AIC1739 2 Power 12V 5V 2 5V 3 3V ViewSonic Corporation Confidential Do Not Copy VA721 2 62...
Страница 72: ...11 PCB Layout Diagrams Main board Control board ViewSonic Corporation Confidential Do Not Copy VA721 2 69...