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A.2 Conformal Coating
The areas around the crystal oscillator and the battery backup circuit on the BL2600 mod-
ule have had the Dow Corning silicone-based 1-2620 conformal coating applied. The con-
formally coated areas are shown in Figure A-4. The conformal coating protects these
high-impedance circuits from the effects of moisture and contaminants over time.
J4 RABBITNET 1
Q1
J5
U5
J6 RABBITNET 0
J7
J8
C10
R111
R10
U11
C14
R15
U12
R18
C13
R16
C20
R17
R19
R21
R25
R27
R29
R20
R26 R28
R30
R32
C23
U13
U14
JP6
R43
2
1
AIN1 AIN3 AIN5 AIN7 AGND AV1 AV3 AI1 AI3 AGND
AIN0
AIN0 AIN2 AIN4 AIN6 AGND AV0 AV2 AI0 AI2 AGND
AIN1
AIN2
AIN3
JP6
4–20 mA
AV0 AV1 AV2 AV3 AI0 AI1 AI2
AI3
Figure A-4. BL2600 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.
74
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q14
Q15
Q16
Q12
Q13
C2
C3
U6
RP12
RP14
U7
RP15
U8
C8
RP16
J9
U9
C9
C78
C17
BT1
L1
C27
Q17
D1
U15
J11
J13
20
2
19
1
C25
J12
+HK0
GND
HOUT1
C22
GND
HOUT0
+HK1
GND
J15
DCIN DCIN GND
GND
+HK0
GND
HOUT1
AGND
GND
HOUT0
+HK1
GND
R84
RP2
R1
C1
RP5
U1
R8
C3
R7
R9
R10
U1
C5
R14
U2
R17
R18
RP6
R19
R20
J3
R22
R23
U4
R6
C31
D1
R25
RP17 RP18
U5
U4
RCM1
R29
RCM3000 ETHERNET CORE MODULE
R37
U6
R35
C42
R39
Y3
JA
R40
Q1
R41
C47
GND/EGND
C53
C57
R7
C59
L1
U8
C62
L2
C64
U16
C67
C68
R58
C71
R63 R64
J4
U17
C79
DS1
Y4
R69
DS2
R71
DS3
R75
C32
R73
GND
C86
C33
U18
C28
R58
R59
R60
485 TERM.
C35 C36 C37
RESISTOR
C34
D2 Q18
Q19
D4 Q20
D3
RXE
485+
RXC
RXF
J14
JP7
26
2
25
1
+HK2
GND
HOUT3
TXC
TXF
TXE
485–
HOUT2
+HK3
GND
+HK2
GND
HOUT3
GND
RXC
RXF
RXE
485+
HOUT2
+HK3
GND
TXC
TXF
TXE
485–
GND
Conformally
coated area
RP1
R8
J17
Wolf (BL2600)
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