20-101-1139 Rabbit Semiconductor, 20-101-1139 Datasheet - Page 118

• Manufacturer Part Number: 20-101-1139
• Description: RCM4310 RABBITCORE
• Manufacturer: Rabbit Semiconductor

Specifications of 20-101-1139

• Module/board Type: MPU Core Module
• Product: Microcontroller Modules
• Data Bus Width: 8 bit
• Core Processor: Rabbit 4000
• Clock Speed: 58.98 MHz
• Interface Type: Ethernet
• Flash: 1 MByte
• Timers: 10 x 8 bit
• Operating Supply Voltage: 3.3 V
• Board Size: 72 mm x 47 mm x 21 mm
• For Use With/related Products: RCM4310
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1142

C.1 Power Supplies
The RCM4300 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 RCM4300 board through header J2.
An RCM4300 with no loading at the outputs operating at 58.98 MHz typically draws
240 mA, and may draw up to 275 mA at 3.6 V and 85°C; the corresponding current draw
for the RCM4210 is typically 200 mA, and up to 225 mA at 3.6 V and 85°C.
C.1.1 Battery Backup
The RCM4300 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 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 RCM4300 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.
RabbitCore RCM4300 User’s Manual
Appendix C provides information on the current requirements of
the RCM4300, 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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