ViewSonic VP950b Service Manual page 19

4.4 INTRODUCTION OF IC
TSUMO5PCWHL-LF (U401): integrate ADC, OSD, SCALER, MCU, LVDS, convert
analog RGB into digital and room and shrink scaling output to LCD panel.
PIN Function:
Pin
37
38
39
40
30 DDCA_SDA/RS232_TX DDC data for analog interface; 4mA driving strength
31 DDCA_SCL/RS232_RX DDC data for analog interface
100
1
80
84
52
27
28
26
25
15
53、52 MODE[1：0]
96
97
8,14,16,24,
98
32,49,56,75
34,51,66,82
2,5,11,29,3
3,50,57,76,
79,83
AP1117E33LA (U707,U705): DC power convert, convert to 3.3v.
AZ1117D-1.8EI (U708): DC power convert, convert to 1.8v.
SST25LF020A-33-4C-SAE (U402): SST's serial flash family features a four-wire,
SPI-com-patible interface that allows for a low pin-count package occupying
less board space and ultimately lowering total system costs. The
ViewSonic Corporation
Pin Name
SDO
CSZ
SCK
SDI
DDCD_SDA
DDCD_SCL
BYPASS
RST
VCTRL
HSYNCO
VSYNCO
REFP
REFM
REXT
XIN
XOUT
AVDD＿33
VDDP
VDDC
GND
SPI flash serial data output
SPI flash chip select
SPI flash serial select
SPI flash serial data input
UART transmitter/GPIO
UART transmitter/GPIO
DDC Data and HDCP Slave Port Data for DVI Interface;
4mA driving strength
DDC Clock and HDCP Slave Port Data for DVI Interface;
4mA driving strength
For External Bypass Capacitor
Chip reset; High reset
Regulator control
Analog HSYNC input
Analog VSYNC input
Internal ADC top de-coupling pin
Internal ADC bottom de-coupling pin
External resistor 390 ohm to AVDD_33
Input Chip Configuration Input
MODE[1:0]
00
Xin; Crystal Oscillator Input
Xout; Crystal Oscillator Output
DVI Power 3.3V
Digital Output Power 3.3V
Digital Core Power 1.8V
Ground
- 19 –
Confidential - Do Not Cop
Function
Chip Operation
Normal Operation
VP950b