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A.2 Conformal Coating
The areas around the crystal oscillator and the battery backup circuit on the BL2000 have
had the Dow Corning silicone-based 1-2620 conformal coating applied. The conformally
coated areas are shown in Figure A-3. The conformal coating protects these high-imped-
ance circuits from the effects of moisture and contaminants over time.
+RAW
GND
+K
RST-
IN1
J1
J2
GND
GND
GND
R4
R6
R1
C10
R20
C20
C17
C24
J6
C23
D1
C25
C28
D2
1
4
2
3
J7
POWER IN
GND
GND
GND
J8
J10
IN2
IN3
IN4
IN5
IN6
Figure A-3. BL2000 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 Rabbit Semiconductor
Technical Note 303, Conformal Coatings.
62
J4
IN0
485-
485+ RXD2 TXD2 RXD1 TXD1
AGND DAC1 DAC0 ADC8 ADC7 ADC6 ADC5 ADC4 ADC3 ADC2 ADC1 ADC0
J3
GN D
GND
GND
AGND
AGND
C2C3
J5
R13
U2
C75
C1
C8
R9
R12
C80
R130
R16
R15
U1
R19
R153
R154
C18
JP2
C16
C19
Y3
U5
Y2
U4
Q2
R30
C29
R32
R34
R35
R40
C31
R31
D3
L1
R33
R41 R42
R43 R44 R45
D4
D5
D6
D7
C43
C44
C45
C46
C47
GN D
GND
GND
GND
GND
IN7
IN8
IN9
IN10 OUT8 OUT9 GND
OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7
AGND
AG ND
AGND
AGND
R5
C79
R2
C78
R3
J12
C5
C7
R8
C9
U3
R7
C4
R14
R18
C12
R17
C13
R21
C76
R152
Q1
R22
C77
C21
Y1
4 3
1
2
R29
K1
C26
Q4
BT1
D
U6
Q3
+
G
+
Q5
C32
Q6
DS8
R46 R47 R48 R49
D8
D9
D10 D11 D12
C48
C49
C50
C51
C52
GN D
GND
GND
GND
GND
J11
J9
NO
COM
NC
GND
Conformally
coated area
Wildcat (BL2000)
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