Eiki LC-NB3E service manual IIC Bus DA Converter IC2161 Port Functions

Control Port Functions

●IIC Bus DA Converter (IC2161) Port Functions

Pin No.	Name	Function	Action
1	R	Reset	Fixed “H”
2	SCL	IIC SCL	Active “L”
3	SDA	IIC SDA	Active “L”
4	AO7	RCLP	R Signal clamp reference voltage
5	AO8	GCLP	G Signal clamp reference voltage
6	AO9	BCLP	B Signal clamp reference voltage
7	AO10	AV/PC	AV/PC switch (L: AV H: PC)
8	AO11	SYNC_SW	Fixed “H”
9	AO12	G_BLK_DC	Video G signal pedestal voltage
10	VrefL		D/A converter lower ref. voltage	Connected to GND
11	VrefU1		D/A converter upper ref. voltage (CH7~CH12)		Vcc(5V)
12	GND	GND	GND
13	VrefU2		D/A converter upper ref. voltage(CH1~CH6)		Vcc(5V)
14	AO1	SCP SW	Sandcastle pulse SW Video/S-Video/480i/575i: L else: H
15	AO2	BLANK SW	H Blank width SW 1080i/1035i/720p/480p/575p: H else: L
16	AO3	MACRO	H: PC, AV(1080i50Hz) L: AV
17	AO4	CBAL_SW	Color uniformity correction SW
18	AO5	B_BLK_DC	Video B signal pedestal voltage
19	Ao6	R_BLK_DC	Video R signal pedestal voltage
20	Vcc	Digital power supply	Vcc(5V)
21	Vdd	Analo gpower supply	Vcc(5V)
22	CS2	Chip Select 2	Fixed “L”
23	CS1	Chip Select 1	Fixed “H”
24	CS0	Chip Select 0	Fixed “H”

●IIC Bus DA Converter (IC1581) Port Functions

Pin No.	Name	Function	Action
1	R	Reset	Fixed “H”
2	SCL	IIC SCL	Active “L”
3	SDA	IIC SDA	Active “L”
4	AO7	REF_B	D/A reference voltage
5	AO8	REF_G	D/A reference voltage
6	AO9	REF_R	D/A reference voltage
7	AO10	Not used	0V fixed
8	AO11	Not used	0V fixed
9	AO12	Not used	0V fixed
10	VrefL		D/A converter lower ref. voltage	Connected to GND
11	VrefU1		D/A converter upper ref. voltage (CH7~CH12)		Vcc(5V)
12	GND	GND	GND
13	VrefU2		D/A converter upper ref. voltage (CH1~CH6)		Vcc(5V)
14	AO1	B-CENT	Video center voltage
15	AO2	G-CENT	Video center voltage
16	AO3	R-CENT	Video center voltage
17	AO4	DWN	Panel control signal
18	AO5	RGT	Panel control signal
19	AO6	XRGT	Panel control signal
20	Vcc	Digital power supply	Vcc(5V)
21	Vdd	Analog power supply	Vcc(5V)
22	CS2	Chip Select 2	Fixed “L”
23	CS1	Chip Select 1	Fixed “L”
24	CS0	Chip Select 0	Fixed “L”

●IIC Bus DA Converter (IC2571) Port Functions

Pin No.	Name	Function	Action
1	R	Reset	Fixed “H”
2	SCL	IIC SCL	Active “L”
3	SDA	IIC SDA	Active “L”
4	AO5	Not used
5	AO6	VCOMR
6	AO7	VCOMG
7	AO8	VCOMB
8	VrefL		D/A converter lower ref. voltage	Connected to GND
9	VrefU1		D/A converter upper ref. voltage (CH5~CH8)		Connected to Vcc
10	GND	GND	GND
11	VrefU2		D/A converter upper ref. voltage (CH1~CH4)		Connected to Vcc
12	AO1	NRSB
13	AO2	NRSA
14	AO3	Not used
15	AO4	Not used
16	Vcc	5 V	Vcc(5V)
17	Vdd	5 V	Vdd(5V)
18	CS2	Chip Select 2	Fixed “L”
19	CS1	Chip Select 1	Fixed “L”
20	CS0	Chip Select 0	Fixed “H”

-43-