ViewSonic VA1721WMB - Page 17

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ViewSonic Corporation
Confidential - Do Not Cop VA1721wmb
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:
AP1084K32LA(U702): DC power convert, used to 5v convert 3.3v.
Pm25LV512A/010A/020/040(U402): The PM25LV010 are 512 Kbit/1 Mbits/2 Mbit/4
Mbit3.0 Volt-only Serial Peripheral Interface(SPI) Flash memories. The devices
are designed to support 33MHz fastest clock rate in the industry in normal read
mode, 100MHz in fast read mode and the bottom 4Kbyte sector into four smaller
1 Kbyte sectors features(except Pm25LV512A), The devices use a single low
voltage, ranging from 2.7 Volt to 3.6 Volt, power supper to perform read, erase
and program operations. The devices can be programmed in standard EPROM
programmers as well.
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