Maxon Telecom SM-2000 service manual Voltage Charts SM-2150/VHF, IC409

MAXON SM-2000 MOBILE

VOLTAGE CHARTS (SM-2150/VHF)

VOLTAGE CHARTS (SM-2150/VHF)

IC409

PIN	DESCRIPTION	TX	RX	PIN	DESCRIPTION	TX	RX
1	DATA	0	0	21	CH-4
2	EEPROM ENABLE	0	0	22	CH-8
3	PLL ENABLE	5	5	23	MONITOR	5	5/0
4	CHANNEL SPACING	5/0	5/0	24	PTT	0	3.9
5	DATA IN	0	0	25	PROG. ENABLE	5	5
6	RED L.E.D.	5	0	26	TX ENABLE	5	0
7	BUSY	5/0	0	27	ALERT TONE	0	0
8	EXT OPTION	5	5	28	MF6 CLK	CL	CL
9	HOOK SW	0/3.7	0/3.7	29	CALL DETECT	0	0
10	LOCK DET	0	0	30	SEND UP CONTROL	0	0
11	TEST	5	5	72	GND	0	0
12	X1	5	5	73	VCC	5	5
13	X2 (OPEN)	0	0	74	OSC1	2.3	2.3
14	GND	0	0	75	OSC2	2.3	2.3
15	D TO A	5/0	0	76	RESET	0	0
16	D TO A	5/0	0	77	AUDIO ENABLE	5	5/0
17	TONE ENABLE	5/0	0	78	GREEN L.E.D.	0	5
18	D TO A	5/0	0	79	RX ENABLE	0	5
19	CH-1			80	CLK
20	CH-2

IC411

PIN	1	2	3	4	5	6	7	8
RX VOLTAGE	0	4	1.9	1.9	0	0	0	0
TX VOLTAGE	0	1.2	1.9	2.75	2.75	0	0	2
PIN	9	10	11	12	13	14	15	16
RX VOLTAGE	5	5	0	1.9	3.7	1.9	0.5	5
TX VOLTAGE	0	0	0	1.9	4	1.9	1.2	5

	IC412				IC401
PIN	TX	RX	PROGRAM	PIN		TX	RX
1		0	0	1		0	0
2		0	0	2		0	0
3	3.7	3.7	0	3		2	1.8
4	3.7	3.7	0	4		2	2
5		0	0	5		5	0
6		GND	GND	6		0	0
7		GND	GND	7		0	0
8		GND	GND	8		SAT 1.9	2
9		5	0	9		SAT 1.9	2
10		5	0	10		0	0
11		5	0	11		0	0
12		0	0	12		0	5
13	0	3.8	3.6	13		5	5
14	0	3.8	3.6	14		5	5
15	0	0	0
16		5	5

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December 98