Circuit Description - ViewSonic VS10047 Service Manual

4. Circuit Description

A. Scaling controller
General
  E mbedded dual DDC support DDC1 and DDC2B,CI
  Z oom scaling up and down
  E mbedded Pattern Generator
  N o external memory required.
  R equire only one crystal
  E mbedded reset control output
  E mbedded crystal output to MICROP
  3 channels 8 bits PWM output, and selectable PWM clock frequency.
PIN DESCRIPTION
(I/O Legend: A= Analog, I=Input, O=Output, P=Power, G=Ground)
■ ADC: 15 pins
Name
ADC_ GND
ADC_REFIO
ADC_VDD
BLUE+
BLUE-
ADC_ GND
SOG/ADC_TEST
GREEN+
GREEN-
ADCB_VDD
RED+
RED_
ADC_GND
ADC_GND
ADC_VDD
AHS
AVS
■ PLL:8 pins
Name
XO
XI
DPLL GND
DPLL VDD
APLL VDD
PLL TEST1
PLL TEST2
APLL GND
ViewSonic Corporation
to generate all timing
I/O Pin No
AG 27 ADC ground
AP 28 ADC band-gap voltage de-coupling
AP 29 Analog power
AI 30 Analog input from BLUE channel
AI 31 Analog input ground from BLUE channel
AG 32 ADC ground
AIO 33 SOG in/ADC test pin
AI 34 Analog input from GREEN channel
AI 35 Analog input ground from GREEN channel
AP 36 Analog power
AI 37 Analog input from RED channel
AI 38 Analog input ground from RED channel
AG 39 Analog ground
AG 40 Analog ground
AP 41 Analog power
AI 42 Analog HS input
AI 43 Analog VS input
I/O Pin No
AI 1 Reference clock output
AO 2 Reference clock input
AG 3 Ground for digital PLL
AP 4 Power for digital PLL
AP 5 Power for multi-phase PLL
AIO 6 Test Pin 1 / IRQ#
AIO 7 Test Pin 2/Power-on-latch for crystal out
Frequency
AG 8 Ground for multi-phase PLL
10
Description
Description
Confidential - Do Not Copy
Note
1.20V
(3.3V)
(3.3V)
(3.3V)
(10), (4), (5)
(2), (4), (5)
Note
(3.3V)
(3.3V)
3.3V tolerance
VE710s/b-2
VA721