A.5 Conformal Coating
The areas around the 32 kHz real-time clock crystal oscillator has had the Dow Corning
silicone-based 1-2620 conformal coating applied. The conformally coated area is shown
in Figure A-5. The conformal coating protects these high-impedance circuits from the
effects of moisture and contaminants over time.
C82
Y1
C65
RP3
J3
C4
C59
R5
R4
U2
C3
C66
C69
C75
C53
C17
C13
C55
C52
C61
R16
C22
C1
C18
R29 Q1
U14 C89
U9
D1
C73
C84
R32
R24
Y2 C25
C33
C23
C26
R23
U12
U6
C38
R31
R15
R17
R22
R27
J4
Conformally coated
area
C42
Y3
C46
R46 R47
C47
GND
Figure A-5. RCM3000 Areas Receiving Conformal Coating
Any components in the conformally coated area may be replaced using standard soldering
procedures for surface-mounted components. A new conformal coating should then be
applied to offer continuing protection against the effects of moisture and contaminants.
NOTE: For more information on conformal coatings, refer to Technical Note 303, Con-
formal Coatings .
User ’s Manual
59
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