20-101-1094 Rabbit Semiconductor, 20-101-1094 Datasheet - Page 121

• Manufacturer Part Number: 20-101-1094
• Description: MCU RCM4000 RABBITCORE
• Manufacturer: Rabbit Semiconductor

Specifications of 20-101-1094

• Module/board Type: MPU Core Module
• Product: Microcontroller Modules
• Core Processor: Rabbit 4000
• Clock Speed: 58.98 MHz
• Interface Type: Ethernet, Serial
• Flash: 512 KB
• Timers: 10 x 8 bit, 1 x 10 bit, 1 x 16 bit
• Operating Supply Voltage: 3 V to 3.6 V
• Board Size: 47 mm x 61 mm x 20 mm
• Core: RCM4000
• Processor Series: RCM4000
• Cpu Core: Rabbit 4000
• For Use With/related Products: RCM4000
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1139

C.1 Power Supplies
The RCM4000 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 RCM4000 board through header J2.
An RCM4000 with no loading at the outputs operating at 58.98 MHz typically draws
110 mA.
C.1.1 Battery Backup
The RCM4000 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 RCM4000 powered down.
A lithium battery with a nominal voltage of 3 Vand 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. A minimum battery voltage of 2.5 V is required for
proper operation.
User’s Manual
Appendix C provides information on the current requirements of
the RCM4000, 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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