Pinning - Changhong Electric 21NF55 Service Manual

4) pinning

SYMBOL
P1.3/T1
P1.6/SCL
P1.7/SDA
P2.0/TPWM
P3.0/ADCO/PWMO
P3.1/ADC1/PWM1
P3.2/ADC1/PWM2
P3.3/ADC3/PWM3
VSSC/P
P0.5
P0.6
VSSA
SECPLL
VP2
DECDIG
PH2LF
PH1LF
GND3
DECBG
(1)
AVL/EWD
VDRB
VDRA
IFIN1
IFIN2
IREF
VSC
TUNERAGC
(1)
AUDEEM/SIFIN1
(1)
DECSDEM/SIFIN2
GND2
(1)
SNDPLL/SIFAGC
AVL/SNDIF/REFO/
(1)
AMOUT
HOUT
FBISO
AUDEXT/
(1)
QSSO/AMOUT
EHTO
PLLIF
IFVO/SVO
VP1
CVBSINT
GND1
CVBS/Y
CHROMA
(1)
AUDOUT/AMOUT
INSSW2
R2/VIN
G2/YIN
SERVICE MANUAL
Table 5
PIN
1 port 1.3 or Counter/Timer 1 input
2
2 port 1.6 or I C-bus clock line
2
3 port 1.7 or I C-bus data line
4 port 2.0 or Tuning PWM output
5 port 3.0 or ADC0 input or PWM0 output
6 port 3.1 or ADC1 input or PWM1 output
7 port 3.2 or ADC2 input or PWM2 output
8 port 3.3 or ADC3 input or PWM3 output
digital ground for μ-Controller core and periphery
9
10 port 0.5 (8mA current sinking capability for direct drive of LEDs)
11 port 0.6 (8mA current sinking capability for direct drive of LEDs)
12 analog ground of Teletext decoder and digital ground of TV-processor
13 SECAM PLL decoupling
14 2nd supply voltage TV-processor (+8V)
15 decoupling digital supply of TV-processor
16 phase-2 filter
17 phase-1 filter
18 ground 3 for TV-processor
19 bandgap decoupling
20 Automatic Volume Levelling/East-West drive output
21 vertical drive B output
22 vertical drive A output
23 IF input 1
24 IF input 2
25 reference current input
26 vertical sawtooth capacitor
27 tuner AGC output
28 audio deemphasis or SIF input 1
29 decoupling sound demodulator or SIF input2
30 ground 2 for TV processor
31 narrow band PLL filter/AGC sound IF
Automatic Volume Levelling/sound IF input/subcarrier reference
32
output/AM output
33 (non controlled)
34 horizontal output
flyback input/sand castle output
35
external audio input/QSS intercarrier out/AM audio output (non
36
controlled)
37 EHT/overvoltage protection input
38 IF-PLL loop filter
39 IF video output/selected CVBS output
40 main supply voltage TV-processor (+8V)
41 internal CVBS input
42 ground 1 for TV-processor
43 external CVBS/Y input
44 chrominance input (SVHS)
45 2nd RGB/YUV insertion input
46 2nd R input/V (R-Y) input
47 2nd G input/U input
DESCRIPTION
22