User`s manual

User’s Manual 61
Alternatively, you may wish to add a 2-pin connector with a 2 mm pitch for hooking up to
an external backup battery as shown in Figure C-3.
Figure C-3. Installing Optional Battery Connector on RCM2300
A lithium battery with a nominal voltage of 3 V and a minimum capacity of 165 mA·h is
recommended. A lithium battery is strongly recommended because of its nearly constant
nominal voltage over most of its life.
The drain on the battery by the RCM2300 is typically 16 µA when no other power is sup-
plied. If a 950 mA·h battery is used, the battery can last more than 6 years:
The actual life in your application will depend on the current drawn by components not on
the RCM2300 and the storage capacity of the battery. Note that the shelf life of a lithium
battery is ultimately 10 years.
PE3
GND
PD6
PD2
PD1
PD0
PD7
J1
Y1
VCC
VBAT
+
GND
R22
R21
C14
C13
D2
D3
C3
R38
R41
R39
RT1
D1
R7
R8
U6
R37
Y3
R18
C24
U2
R29
C23
C9
R17
R19
G
R34
WD
J3
VCC
VCC
PE6
BEN
C4
R36
C27
R1
C8
R2
C10
JP2
JP1
R23
R13
C11
U1
R15
C12
C15
R26
Q2
Q3
Q4
Q5
R20
J2
-
+
+
950 mA·h
16 µA
------------------------ 6.8 years.=