Introduction Of Ic - ViewSonic VA703b Service Manual

4.4 INTRODUCTION OF IC

TSUM16AK(U401): integrate ADC, OSD, SCALER, MCU, LVDS, convert analog RGB
into digital and room and shrink scaling output to LCD panel.
PIN Function:
Pin
70
71
72
73
65 DDCA_SDA/RS232_TX DDC data for analog interface; 4mA driving
66 DDCA_SDA/RS232_RX DDC
19
22
11
63
64
62
61
51
21
29
4
32
33
44 50 60
52
34
14 67 95
103 115
12 68 97
117
AIC1084-33PM (U702): DC power convert, used to 5v convert 3.3v.
LT1117-18(U701): DC power convert, used to 5v convert 3.3v.
PM25LV010-25SCE (U402): The PM25LV010 are 512 Kbit/1 Mbits 3.0 Volt-only serial
Flash memories. These devices are designed to use a single low voltage,
ranging from 2.7 Volt to 3.6 Volt for 25MHz or from 3.0 Volt to 3.6 Volt for 33MHz
to perform read, erase and program operations. The devices can be programmed
in standard EPROM programmers as well.
ViewSonic Corporation
Symbol
SDO
CSZ
SCK
SDI
RST
RSTN
VCTRL
HSYNCO
VSYNCO
REFP
REFM
REXT
PWM1
PWM0
BYPASS
XIN
XOUT
AVDD ADC
AVDD PLL
AVDD MPLL
VDDP
VDDC
Confidential - Do Not Cop
SPI flash serial data output; Input w/5V-tolerant
SPI flash chip select; output
SPI flash serial select; output
SPI flash serial data input; output
strength/UART transmitter/GPIO; I/O w/5V-tolrant
data for
transmitter/GPIO; Input w/5V-tolrant
Chip reset; High reset; Input w/5V-tolerant
Chip reset; Low reset; Input w/5W-toerant
Regulator control; Output
Analog HSYNC input
Analog VSYNC input
Internal ADC top de-coupling pin
Internal ADC bottom de-coupling pin
External resistor 390 ohm to AVDD ADC
PWM1; 4mA driving strength; Output
PWM0; 4mA driving strength; Output
For External Bypass Capacitor
Xin; Crystal Oscillator Input
Xout; Crystal Oscillator Output
ADC Power 3.3V
PLL Power 3.3V
MPLL Power 3.3V
Digital Output Power 3.3V
Digital Core Power 1.8V
- 17 –
Description
analog interface/UART
VA703b/VA703m