SAMHOP Microelectronics Corp.
SM5172
312 RF DECODER
Single Resistor Oscillator
SM5172's oscillator be constructed by connecting a resistor between OSC1 and OSC2 pin. SM5172's OSC
frequency must be 1.8 to 5.8 ratio more than SM5162.
Encoder OSC Frequency (SM5162)
100
90
80
70
60
50
R = 510K
R = 1.2 M
KHz
40
30
20
R = 2.7 M
R = 3.0 M
R = 3.3 M
R = 4.3 M
10
1
2
1
5
0
VOLTAGE
3
6
9
Dncoder OSC Frequency (SM5172)
300
R = 100 K
R = 300 K
250
200
110
100
KHz
R = 620 K
R = 680 K
R = 820 K
R = 1.0 M
50
0
3
6
9
12
15 VOLTAGE
Suggested oscillator resistor of SM5162/ SM5172:
SM5162 (Encoder) SM5172 (Decoder)
4.7M Ω
3.0M Ω
2.2M Ω
1.2M Ω
820K Ω
620K Ω
300K Ω
180K Ω
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