User`s manual

User’s Manual 33
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.
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.
Conformally coated
area
Y1
JP1
JP2
JP3
JP4
ACT
LNK
J4
GND
C3
R4
R5
C4
U2
J3
C41
C44
DS2
DS1
Y3
C42
C38
Y2
U9
Q1
D1
R29 R28
R32
R33
U5
R14
R19
R11
R12
C23
U12
C83
R49
R16
C17
R21
C26
R30
R23
U6
C19
R15
R17
R22
R27
RP2
C46
C47
R46
R47
RP1
RP3
RP4
C84
R24
C25
R31