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A PPENDIX D. P OWER S UPPLY
Appendix D provides information on the current requirements of
the RCM3360/RCM3370 modules, and includes some background
on the reset generator.
D.1 Power Supplies
Power is supplied from the motherboard to which the RCM3360/RCM3370 is connected
via header J4. The RCM3360/RCM3370 require a regulated 3.15 V to 3.45 V DC power
source. An RCM3360/RCM3370 with no loading at the outputs operating at 44.2 MHz
typically draws 350 mA.
D.1.1 Battery-Backup Circuits
The RCM3360/RCM3370 does not have a battery, but there is provision for a customer-
supplied battery to back up the data SRAM and keep the internal Rabbit 3000 real-time
clock running.
Header J4, shown in Figure D-1, allows access to the external battery. This header makes
it possible to connect an external 3 V power supply. This allows the SRAM and the inter-
nal Rabbit 3000 real-time clock to retain data with the RCM3360/RCM3370 powered
down.
J4
External
Battery
VRAM 29
30
VBAT_EXT
+3.3 VIN
31
32
GND
Figure D-1. External Battery Connections
at Header J4
User ’s Manual
131
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