Preliminary
Electrical Properties
Physical Properties
Package size:
Die size:
Operating temperature:
Storage temperature:
Battery Backup Output voltage:
3.3 V
CBC910
3 mm x 3 mm x 0.9 mm
0.96 mm x 1.36 mm (to center of scribe on wafer)
-40°C to +85°C
-40°C to +125°C
Functional Block Diagram
The CBC910 internal schematic is shown in Figure 2. The input voltage from the power supply (V
DD
) is applied
to the charge pump, the control logic, and is compared to the user-set threshold as determined by the voltage
on V
MODE
. V
MODE
is an analog input ranging from 0V to V
DD
. The ENABLE pin is a digital input that turns off the
charge pump when low. V
OUT
is either supplied from V
DD
or the integrated battery. RESET is a digital output that,
when low, indicates V
OUT
is being sourced by a backup battery.
C
FLY
is the flying capacitor in the voltage doubler circuit. The value of C
FLY
can be changed if the output
impedance of the CBC910 needs to be modified. The output impedance is dictated by
1/fC,
where
f
is the
frequency of oscillation (typically 100kHz) and
C
is the capacitor value (typically 0.1µF). GND is system ground.
VCHG
GND
Figure 2: CBC910 Internal Block Diagram
DS-72-11 Rev 5
©2012 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
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