Crystal Viberation
4MHz
19 Xin
20 Xont
1
3
2
4
5
6
Vcc(5V)
R303 10K -F
R305 10K -F
R403 4.7K
R307 10K-F
CN30
WHT
EXT-S/S
R302 1K
R304 1K
R402 10K
R404 10K
R308 1K
C301
104
C302
104
C303
104
C401
104
C402
104
C304
104
26
27
28
29
41
30
18
R303 10K -F
R306 1K
R401 4.7K -F
6-3 Crystal Viberation Part
This circuit is used for the geneation of the resonant clock by receiving and sending the logic
element information within the core chip. The time on the clock will play the role of time base.
The resonance circuit must apply the rated criteria of each element as specification deviation
will change the core chip time and disable the running.
6-4 Sensor Part
Core chip
Freeze Sensor
Door switch
Magnetic switch
Refrigerating
sensor
Main evaporator
sensor
The sensor and the resistance in F precision are respectively connected to Earthing and DC5V.
The resistance value that varies with the temperature are converted into the corresponding voltage.
Test the voltage at the A/D transition interface of the core chip to determine the temperature.
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