4.4 INTRODUCTION OF IC
STUM16AK(U401): integrate ADC, OSD, SCALER, MCU, LVDS, convert analog RGB
into digital and room and shrink scaling output to LCD panel.
PIN Function:
AIC1084-33PM (U702): DC power convert, used to 5v convert 3.3v.
LT1117-18(U701): DC power convert, used to 5v convert 3.3v.
TPA3003D2 (U601): The TPA3003D2 is a audio amplifier IC,3-W efficient, driving
speakers as low as 8
, range of gain from -40dB to 36 dB. The function of
each pin and the inside circuit diagram are as follows:
Pin Symbol Description
70 SDO SPI flash serial data output; Input w/5V-tolerant
71 CSZ SPI flash chip select; output
72 SCK SPI flash serial select; output
73 SDI SPI flash serial data input; output
65 DDCA_SDA/RS232_TX DDC data for analog interface; 4mA driving
strength/UART transmitter/GPIO; I/O w/5V-tolrant
66 DDCA_SDA/RS232_RX DDC data for analog interface/UART
transmitter/GPIO;Input w/5V-tolrant
19 RST Chip reset; High reset; Input w/5V-tolerant
22 RSTN Chip reset; Low reset; Input w/5W-toerant
11 VCTRL Regulator control; Output
63 HSYNCO Analog HSYNC input
64 VSYNCO Analog VSYNC input
62 REFP Internal ADC top de-coupling pin
61 REFM Internal ADC bottom de-coupling pin
51 REXT
External resistor 390 ohm to AVDD＿ADC
21 PWM1 PWM1; 4mA driving strength; Output
29 PWM0 PWM0; 4mA driving strength; Output
4 BYPASS For External Bypass Capacitor
32 XIN Xin; Crystal Oscillator Input
33 XOUT Xout; Crystal Oscillator Output
44、50、60 AVDD＿ADC
ADC Power 3.3V
52
AVDD＿PLL
PLL Power 3.3V
34
AVDD＿MPLL
MPLL Power 3.3V
14、67、95、
103、115
VDDP Digital Output Power 3.3V
12、68、97、
117
VDDC Digital Core Power 1.8V
ViewSonic Corporation VA503b-1_ VA503m-1
21
Confidential - Do Not Copy
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