Sony Ericsson service manual CDX-M620/M670, Not used. Open

CDX-M620/M670

•IC501 MB90574BPMT-G-321-BND (SYSTEM CONTROL) (MAIN BOARD) (US MODEL)

•IC501 MB90574BPMT-G-322-BND (SYSTEM CONTROL) (MAIN BOARD) (AEP, UK, E MODEL)

Pin No.	Pin Name	I/O	Pin Description
1 – 3	(NCO)	O	Not used. (Open)
4	SP LATCH	O	Spectrum analyzer data latch signal
5	ATT	O	System mute signal
6	SYS RST	O	System reset signal
7	(NCO)	O	Not used. (Open)
8	VCC	—	Power supply pin (+5 V)
9	(NCO)	O	Not used. (Open)
10	E2P SIO	I/O	Tuner unit EEPROM BUS serial data input/output
11	E2P CKO	I/O	Tuner unit EEPROM BUS serial clock input/output
12	FLS SI	I	Flash CPU write-in data input
13	FLS SO	O	Flash CPU write-in data output
14	BUS ON	O	BUS ON signal
15	BEEP	O	Beep signal
16	TEL ATT	I	Telephone mute signal
17	UNI SI	I	SONY BUS serial data input
18	UNI SO	O	SONY BUS serial data output
19	UNI CKO	O	SONY BUS serial clock output
20 – 23	(NCO)	O	Not used. (Open)
24	SIRCS	I	Wireless remote data input
25	DSP SI	I	DSP serial data input
26	DSP SO	O	DSP serial data output
27	DSP CKO	O	DSP serial clock output
28	DSP PLL	O	DSP PLL clock control signal
29	DSP MST	O	DSP master/slave control signal
30	(NCO)	O	Not used. (Open)
31	VOL ATT	O	Electronic volume mute signal
32	TU ATT	O	Not used. (Open)
33	VSS	—	Ground
34	C	—	Not used. (Open)
35	DSP LAT	O	DSP latch signal
36	DSP RST	O	DSP reset signal
37	SHIFT	O	OSC frequency shift signal for DC/DC conv.
38	DVCC	—	Power supply pin (+5 V)
39	DVSS	—	Ground
40	FP CTRL	O	OPEN/CLOSE motor voltage control signal
41	(NCO)	O	Not used. (Open)
42	AVCC	—	Power supply pin (+5 V)
43	AVRH	—	Power supply pin (+5 V)
44	AVRL	—	Ground
45	AVSS	—	Ground
46	KEY IN0	I	Key input 0
47	KEY IN1	I	Key input 1
48	RC IN0	I	Rotary commander input 0
49	(NCO)	O	Not used. (Open)
50	QUALITY	I	Noise detection signal
51	(NCO)	O	Not used. (Open)
52	MPTH	I	Tuner multi path detection signal
53	VSM	I	S-meter voltage detection signal
54	VCC	—	Power supply pin (+5 V)
55	STBY	O	Power amplifier drive signal
56	NS MASK	O	Noise detection ON/OFF control signal

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