101-1226 Rabbit Semiconductor, 101-1226 Datasheet - Page 161

• Manufacturer Part Number: 101-1226
• Description: RCM3900 DEV KIT UNIVERSAL
• Manufacturer: Rabbit Semiconductor
• Series: RabbitCore 3900r
• Type: MPU Moduler

Specifications of 101-1226

• Contents: RabbitCore Module, Dev. Board, AC Adapter, Cable and Dynamic C® CD-Rom
• For Use With/related Products: RCM3900
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1137

D.1 Power Supplies
Power is supplied from the motherboard to which the RCM3900 is connected via header
J62. The RCM3900 requires a regulated 3.15 V to 3.45 V DC power source. An RCM3900
with no loading at the outputs operating at 44.2 MHz typically draws 350 mA.
D.1.1 Battery Backup
The RCM3900 does not have a battery, but there is provision for a customer-supplied bat-
tery to back up the data SRAM and keep the internal Rabbit 3000 real-time clock running.
Header J62, 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 RCM3900 powered down.
RabbitCore RCM3900 User’s Manual
Appendix D provides information on the current requirements
of the RCM3900, and includes some background on the chip
select circuit used in power management.
Figure D-1. External Battery Connections
A
PPENDIX
at Header J62
D. P
OWER
S
UPPLY
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