Sony MDX-CA680 Vsm, Nil, KEYIN1, KEYIN0, RCIN0, Quality, Dstsel, Vref+, Vdd, Oscin, Lcdso, Lcdce

MDX-CA680/CA680X

• MAIN BOARD IC501				MN101C49KTJ (US), MN101C49KTK (AEP, UK) (SYSTEM CONTROLLER)
Pin No.	Pin Name				I/O		Description
1			VREF–		I	Reference voltage (0V) input terminal (for A/D converter)
2			VSM		I	FM and AM signal meter voltage detection signal input from the FM/AM tuner unit (TU10)
						(A/D input)
3			NIL		I	Not used (fixed at “L”)
	KEYIN1					Key input terminal (A/D input) LSW902, LSW905 to LSW911 (LSW910 and LSW911 are AEP,
4					I	UK models only), S902 to S905 (MENU, SOUND, ENTER, S SCROLL, D DISPLAY, LIST,
						AF, TA, > MSEEK +, . mSEEK –, DISC/PRESET +, DISC/PRESET –, )
5	KEYIN0				I	Key input terminal (A/D input) LSW901, LSW903, LSW904, LSW914 to LSW919, S906, S907
						(OFF, SOURCE, MODE, 6, 5, 4, 3, 2, 1, D-BASS, MBP)
6			RCIN0		I	Rotary remote commander key input terminal (A/D input)
7	QUALITY				I	Noise level detection signal input at SEEK mode (A/D input)
8			MPTH		I	Multi-path detection signal input from the RDS decoder (IC51) (A/D input)
9	DSTSEL				I	Destination setting terminal (fixed at “L” in this set)
10			VREF+		I	Reference voltage (+5V) input terminal (for A/D converter)
11			VDD		—	Power supply terminal (+5V)
12	OSCOUT				O	Main system clock output terminal (18.432 MHz)
13			OSCIN		I	Main system clock input terminal (18.432 MHz)
14			VSS		—	Ground terminal
15			XIN		I	Sub system clock input terminal (32.768 kHz)
16			XOUT		O	Sub system clock output terminal (32.768 kHz)
17			MMOD		I	Selection signal of memory mode input terminal “L”:single chip mode (fixed at “L”)
18			LCDSO		O	Serial data output to the liquid crystal display driver (IC900)
19			LCDCE		O	Chip enable signal output to the liquid crystal display driver (IC900)		“H” active
20	LCDCKO				O	Serial data transfer clock signal output to the liquid crystal display driver (IC900)
21 to 23			NC		O	Not used (open)
24	SYSRST				O	Reset signal output to the SONY bus interface (IC505) “L”: reset
25		BUSON			O	Bus on/off control signal output to the SONY bus interface (IC505)		“L”: bus on
26	KEYACK				I	Input of acknowledge signal for the key entry Acknowledge signal is input to accept function
						and eject keys in the power off status On at input of “H”
27			DAVN		I	Synchronized detection signal of RDS data block input from the RDS decoder (IC51)
						“H” active (AEP, UK models only)
28			BUIN		I	Battery detection signal input from the SONY bus interface (IC505)
						“L” is input at low voltage
29			SIRCS		I	SIRCS remote control signal input from the remote control receiver (IC971)
30, 31			NIL		I	Not used (fixed at “L”)
32			NIH		I	Not used (fixed at “H”)
33			RESET		I	System reset signal input from the reset signal generator (IC602) and RESET switch (S702)
						“L”: reset “L” is input for several 100 msec after power on, then it changes to “H”
34	NOSESW				I	Front panel block remove/attach detection signal input from the nose detection switch (S701)
						“L”: front panel is attached
35			BEEP		O	Beep sound drive signal output to the power amplifier (IC611)
36			NCO		O	Not used (open)
37	TEST IN				I	Setting terminal for the test mode	“L”: test mode, Normally: fixed at “H”
38		ACC IN			I	Accessory detection signal input	“L”: accessory on
39			NCO		O	Not used (open)
40	TELATT				I	Telephone detection signal input terminal At input of “H”, the signal is attenuated by –20 dB
41			NIH		I	Not used (fixed at “H”)

47