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C.2.5 External Battery
A connection for an external backup battery is provided at header J8, shown in Figure C-4.
The header is wired to provide reverse polarity protection.
CPU Card
J3
C19
C23
C24
C25
U10 C27
C28
U6
C26
J7
R2
R5
C4
C7
Y1
R11
R12
C11
R17
C18
RP4
U8
J4
J4
C35
J6
C46
C49
C53
J8
3
2
1
?
+
?
C1
C2
C15
U14
U1
C21
U9
C31
C36
C41
J8
Y3
RT1
R4
C3
R1
R3
U3
C16
J5
J5
C32
C33
D3
D5
D1
D2
Y2
C10
R13
C13
R21
R23
Q1
R26
Q3
BT1
R42
Battery
Figure C-4. External Backup Battery Connection
The external battery connection is useful if the SRAM and real-time clock data need to be
preserved while the backup battery is being changed. This way power can continue to be
applied to the CPU Card from the backplane (if the external backup battery is being
replaced) or from the external battery (if the onboard backup battery needs to be changed
since this requires removing the CPU Card from the backplane in order to access the
onboard backup battery).
170
Smart Star (SR9000)
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