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A.2 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-4. The conformal coating protects these high-impedance circuits from the
effects of moisture and contaminants over time.
Figure A-4. LP3500 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
C16
U1
C36
C19
RN2
D21
D18
C48
C20
U3
C22
D5
D13
BT1
D7
D2
D4
Q22
D8
R30
C10
C13
RN1
R13
R6
R16
R7
Y1
R9
C26
C33
D1
R20 R25
R32
J3
R1
R22
R26
AIN0 AIN1 AIN2 AIN3
AIN0 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 GND
D25
Q17
Q10
Q16
R43
K1
R33
Q6
Q13
D32
Y2
Q12
C51
U12
C55 R44
R47
U8
Q14
D33
J6
U11
R48
U10
U9
RP13
S1
C65
C50 R36 R40 C54
RESET
R50
R49
J5
D22
J2
PROGRAM
PORT
GND VBAT
EXT GND VIN GND
J8
RELAY
C67
R58
Q20
R54
GND
73
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