Table of Contents
Advertisement
Pin number
21
13
14
25
9
24
16
37
34
23
42
41
32
3
36
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, comparator,
controlled duty cycle.
Oscillator with an active current sense circuit. Desired output voltage are determined by the equation,
Volt = 1.25 ( 1 + R67 / R66), In this case, the output voltage are 3.3 Volts
The AIC1739 is a low dropout positive adjustable regulator with minimum of 300mA output current capability.
So it is well suited for 3.3 V and 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, comparator, controlled duty
cycle.
Oscillator with an active current sense circuit. Desired output voltage are determined by the equation,
Volt = 1.25 ( 1 + R85 / R86), In this case, the output voltage are 5.0 Volts for panel power.
ViewSonic Corporation
Pin Name
Pin Number Usage
P1.3
Key / Power on ,off
P3.4
NV_RAM (U4) SDA
P3.5
NV_RAM (U4) SCL
P1.7
Key_down
P6.3
Key_right
P1.6
Key_up
P6.2
Key_left
P4.1
Key_mute
P5.6
VGA connector
P1.5
Key_select
P5.3
LED_red
P5.4
LED_green
P6.6
LCD panel power1 on / off control
P5.0
LCD panel power2 on / off control
P4.0
Backlight on / off control
.
21
Confidential - Do Not Copy
VX912-4
Advertisement
Table of Contents
