20-101-1105 Rabbit Semiconductor, 20-101-1105 Datasheet - Page 103

• Manufacturer Part Number: 20-101-1105
• Description: MODULE RCM4100 RABBITCORE
• Manufacturer: Rabbit Semiconductor

Specifications of 20-101-1105

• Module/board Type: MPU Core Module
• Data Bus Width: 8 bit
• For Use With/related Products: RCM4100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1121

C.1 Power Supplies
The RCM4100 series of modules requires a regulated 3.0 V – 3.6 V DC power source. The
RabbitCore design presumes that the voltage regulator is on the user board, and that the
power is made available to the RCM4100 series of modules through header J2.
A module with no loading at the outputs operating at 58.98 MHz typically draws up to
125 mA.
C.1.1 Battery Backup
The RCM4100 series of modules do not have a battery, but there is provision for a cus-
tomer-supplied battery to back up the data SRAM and keep the internal Rabbit 4000 real-
time clock running.
Header J2, shown in Figure C-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 4000 real-time clock to retain data with the module powered down.
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.
User’s Manual
Appendix C provides information on the current requirements of
the RCM4100 series of modules, and includes some background
on the chip select circuit used in power management.
Figure C-1. External Battery Connections
A
PPENDIX
at Header J2
C. P
OWER
S
UPPLY
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