LG Electronics 42LT640H-ZA Extspk Amp, UART/I2C SWITCH, Extspkcontrol/Debug, Extspk Out

EXT_SPK AMP		400mA
	+5V_Normal
			+5V_SUB_AMP
+5V_SUB_AMP		EXT_SPK
		L1704
		BLM18PG121SN1D

EXT_SPK	EXT_SPK		EXT_SPK
C1700	C1701		IC1700
22uF	0 . 1 u F
16V		TPA6011A4PWPRG4
		PGND_1	ROUT+
		1	24	EXT_SPK		EXT_SPK_R+
					EXT_SPK
				R1711
		ROUT-	SE/BTL		R1714
				100	1K
EXT_SPK_R-		2	23
	EXT_SPK
	R1700	PVDD_1	HP/LINE	EXT_SPK	+5V_SUB_AMP
	1K
		3	22		EXT_SPK
				R1708
		RHPIN	VOLUME	0	R1712
					3.3K	+3.5V_ST
	C1702	4	21
	1uF
	10V	RLINEIN	SEDIFF				EXT_SPK
EXT_AMP_R_IN		5	20			EXT_SPK	R1718
	EXT_SPK						4.7K
						R1717
		RIN	SEMAX			100
		6	19
					EXT_SPK		EXT_SPK
						C	100
		VDD	AGND		R1715
		7	18		10K		R1719
							B
							SUB_AMP_MUTE
		LIN	BYPASS				Q1700
		8	17		EXT_SPK	E	MMBT3904(NXP)
					C1709	OPT	EXT_SPK
						R1716
		LLINEIN	FADE		1uF
						100
EXT_AMP_L_IN		9	16		25V
	C1703
	1uF	LHPIN	SHUTDOWN
	10V	10	15
	EXT_SPK
		PVDD_2	LOUT+
		11	14			EXT_SPK_L+
					EXT_SPK
		LOUT-	PGND_2		R1713
EXT_SPK_L-		12	13		1K
		EXT_SPK
		R1701
		1K

UART/I2C SWITCH
UART_SW1		CONNECTION					UART_SW2	CONNECTION
L	A - B0		MSTAR ADJ				L	A - B0	INTERACTIVE
H	A - B1		MSTAR DEBUG				H	A - B1NEC USB_DOWNLOAD
			R1720						R1728
			100
						UART_SW1			100		UART_SW2
			IC1703
+3.5V_ST		NLASB3157DFT2G							IC1707
							+3.5V_ST
									NLASB3157DFT2G
	SELECT	6			1	B1
						MST_DBG_TX		SELECT		B1
		ON SEMICONDUCTOR							6	1	MST_NEC_TX
C1710	VCC	ANALOG SWITCH				GND			ON SEMICONDUCTOR
0 . 1uF		5			2		C1712	VCC
							0 . 1uF		ANALOG SWITCH	GND
									5	2
	A	4			3	B0	R1726
MST_TX						UART_TX		A		B0
							100		4
			EAN38256201				NEC_RX			3	UART_RX
									EAN38256201
			R1723
			0		OPT
									IC1708
			IC1704						NLASB3157DFT2G
		NLASB3157DFT2G
								SELECT	6	B1
	SELECT					B1				1	MST_NEC_RX
		6			1
						MST_DBG_RX			ON SEMICONDUCTOR
		ON SEMICONDUCTOR						VCC	ANALOG SWITCH	GND
	VCC	ANALOG SWITCH				GND			5	2
		5			2
							R1727
							100	A	4	B0
	A					B0	NEC_TX			3	UART_TX
		4			3
MST_RX						UART_RX
									EAN38256201
			EAN38256201
			R1722
			0	OPT

EXT_SPK_CONTROL/DEBUG

DBG_SW

CONNECTION

R1704

L

A - B0DEBUG_NEC/MSTAR

H

A - B1EXT_SPK CONTROL

100

DBG_SW

+3.5V_ST

IC1701

+3.5V_ST

C1705

NLASB3157DFT2G

R1709

0 . 1 u F

R1706

3.6K

SELECT

B1

0

JK1701

6

1

EXT_VOL+

PEJ027-04

ON SEMICONDUCTOR

VCC ANALOG SWITCH

GND

3

E_SPRING

5

2

UART_SW CONNECTION

LA - B0 NEC DEBUG

H A - B1 MSTAR DEBUG

EEPROM_SW	CONNECTION
L	A - B0 NEC-EEPROM
H	A - B1MSTAR-EEPROM
	R1731
	22
	EEPROM_SW
	C1714

	6A	T_TERMINAL1		A	4	3	B0
								DBG_TX
	7A	B_TERMINAL1			EAN38256201			+3.5V_ST
	4	R_SPRING				IC1702
					NLASB3157DFT2G			R1710
	5	T_SPRING						3.6K
				SELECT			B1	R1707
					6	1		0
	7B	B_TERMINAL2						EXT_VOL-
					ON SEMICONDUCTOR
	6B	T_TERMINAL2		VCC	ANALOG SWITCH		GND
					5	2
				A	4	3	B0
								DBG_RX
					EAN38256201
EXT_SPK OUT
EXT_SPK
JK1700
PEJ029-02
8	G_SPRING					L1700EXT_SPK
								EXT_SPK_R-
3	E_SPRING					L1701EXT_SPK
								EXT_SPK_R+
4	R_SPRING					L1702EXT_SPK
								EXT_SPK_L-
5	T_SPRING					L1703 EXT_SPK
								EXT_SPK_L+
	B_TERMINAL		C1704	C1706	C1707	C1708
7			39pF	39pF	39pF	39pF
			OPT	OPT	OPT	OPT
6	T_TERMINAL
		+3.3V_Normal
			OPT
			R1702		EXT_SPK
			51K
					R1705
					100
							EXT_SPK_DET
			EXT_SPK
			R1703
			4.7K

DBG_TX

DBG_RX

		R1721
		100	UART_DBG_SW
				+3.5V_ST
		IC1705
+3.5V_ST		NLASB3157DFT2G
				R1724
				4.7K
	SELECT	6	1	B1
				MST_DBG_TX
C1711		ON SEMICONDUCTOR		R1725
				0
0 . 1 u F	VCC	ANALOG SWITCH	2	GND
		5
	A	4	3	B0
				NEC_DBG_TX
		EAN38256201
		IC1706
		NLASB3157DFT2G
	SELECT	6	1	B1
				MST_DBG_RX
		ON SEMICONDUCTOR
	VCC	ANALOG SWITCH	2	GND
		5
	A	4	3	B0
				NEC_DBG_RX
		EAN38256201

		1uF
		50V
+3.5V_ST				IC1709
		NLASB3157DFT2G
	SELECT	6			1	B1
C1713
		ON SEMICONDUCTOR
0 . 1uF	VCC	ANALOG SWITCH				GND
		5			2
	A	4			3	B0
EEPROM_SCL
		EAN38256201
				R1730
		0
				OPT
				IC1710
		NLASB3157DFT2G
	SELECT	6			1	B1
		ON SEMICONDUCTOR
	VCC	ANALOG SWITCH				GND
		5			2
	A	4			3	B0
EEPROM_SDA
		EAN38256201
			R1729
		0
		OPT

I2C_SCL

NEC_EEPROM_SCL

I2C_SDA

NEC_EEPROM_SDA

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.

EMEA INTERACTIVE

GP4_MSTAR	2011 . 08 . 21
EXT SPK	1 7	2 0

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