Changhong Electric 34T18, Service Manual, Page: 24 / 61

SERVICE MANUAL
22
Symbol
Pin
Description
QFP-80 SDIP-64
CVBS2 42 - external CVBS2 input
GND 43 - ground for TV-processor
CVBS3/Y 44 42 CVBS3/Y input
C 45 43 chroma input
WHSTR 46 - white stretch capacitor
CVBSO 47 - CVBS output
AUDOUT /AMOUT 48 - audio output /AM audio output (volume controlled)
SVM 49 44 scan velocity modulation output
INSSW2 50 45 2nd RGB / YUV insertion input
R2/VIN 51 46 2nd R input / V (R-Y) input / PR input
G2/YIN 52 47 2nd G input / Y input
B2/UIN 53 48 2nd B input / U (B-Y) input / PB input
BCLIN 54 49 beam current limiter input
BLKIN 55 50 black current input / V-guard input
RO 56 51 Red output
GO 57 52 Green output
BO 58 53 Blue output
VDDA 59 54
analog supply of Teletext decoder and digital supply of
TV-processor (3.3 V)
VPE 60 55 OTP Programming Voltage
VDDC 61 56 digital supply to core (3.3 V)
OSCGND 62 57 oscillator ground supply
XTALIN 63 58 crystal oscillator input
XTALOUT 64 59 crystal oscillator output
RESET 65 60 reset
VDDP 66 61 digital supply to periphery (+3.3 V)
P1.0/INT1 67 62 port 1.0 or external interrupt 1 input
P1.1/T0 68 63 port 1.1 or Counter/Timer 0 input
P1.2/INT0 69 64 port 1.2 or external interrupt 0 input
P1.3/T1 70 1 port 1.3 or Counter/Timer 1 input
P1.6/SCL 71 2 port 1.6 or I
2
C-bus clock line
P1.7/SDA 72 3 port 1.7 or I
2
C-bus data line
P2.0/TPWM 73 4 port 2.0 or Tuning PWM output
P2.1/PWM0 74 - port 2.1
P2.2/PWM1 75 - port 2.2
P2.3/PWM2 76 - port 2.3
P2.4/PWM3 77 - port 2.4
P2.5/PWM4 78 - port 2.5
SYNC_FILTER 79 - CVBS (i.e. P0.6/CVBS) Sync filter input: This pin should be
connected to VSSA via a 100 nF capacitor.
P3.0/ADC0 80 5 port 3.0 or ADC0 input
Note:
1. The functional content of these pins is dependent on the envelope (SDIP-64 or QFP-80), the mode of
operation and on some I
2
C-bus control bits.