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§ DESCRIPTION OF CIRCUIT OPERATION
§ FEATURE OF THE CM-537
•VIDEO, CHROMA, DEFLECTION in one-chip IC.
•Automatic switching of 3-SYSTEM(NTSC, PAL-M, PAL-N).
•FS(Frequency Synthesizer ) Tunning System.
•Function of LAST MEMORY against the electric failure (E
•Separation of PIF and SIF(SAW filter :DSW1013P)
•Minimization of Ringing by applying Ringing-less FBT(2001SPND)
•Auto-compensation of the vertical height level against the frequency change of AC power .
•OVER CURRENT PROTECTION Circuit.
•Elimination Circuit of POP NOISE.
§ OPERATION CHARACTERISTICS OF EACH BLOCK
A.¥-COM BLOCK
1. ¥-COM(DMC42C522N, I701) PIN DESCRIPTION/OPERATION
PIN
NAME/(ABBREV)
1
NTSC-M
(RCO/PWM14)
2
PAL-M
(R83)
3
AC POWER DOWN
(R03/INT3)
4
SD INPUT
(RO2/INT2)
5
REMOTE CONTROL
INPUT
(R01/INT1TIM1)
6
KEY RETURN IN 0
(R00/INT0/TIM0)
7
Xin
8
Xout
9
RESET
10
KEY RETURN IN 1
(R82)
11
Vss
12
KEY RETURN IN 2
(R81)
13
KEY SCAN OUT 0
& TIMER
(R80)
FUNCTION
3-SYSTEM SWITCHING
3-SYSTEM SWITCHING
MAIN POWER DOWN Detect input:active LOW
SYNC. signal INPUT
REMOTE CONTROL signal input
REMOTE CONTROL IC : M50560-388GP/M50560-001
·KEY MATRIX COLUMN 0
·HOLD MODE : WAKE-UP using INT1
SYSTEM CLOCK : 4.1943 MHz
SYSTEM RESET
KEY MATRIX COLUMN 1
GND
KEY MATRIX COLUMN 2
· KEY MATRIX ROW 0
· Active HIGH when ON TIMER is set.
10
2
PROM:24LC028).
H: signal detect
L: no signal
(CUSTOM CODE: 14H)
REMARK
CMOS
PUSH PULL
CMOS
PUSH PULL
CMOS
PUSH PULL
PUSH PULL
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