101-1156 Rabbit Semiconductor, 101-1156 Datasheet - Page 126
![no-image](/images/no-image-200.jpg)
101-1156
Manufacturer Part Number
101-1156
Description
KIT DEVELOPMENT INT'L RCM4200
Manufacturer
Rabbit Semiconductor
Series
RabbitCore 4000r
Type
MPU Moduler
Specifications of 101-1156
Contents
RabbitCore Module, Dev. Board, AC Adapter, Cable and Dynamic C® CD-Rom
Processor To Be Evaluated
Rabbit 4000
Data Bus Width
8 bit
Interface Type
Ethernet
Silicon Manufacturer
Rabbit Semiconductor
Core Architecture
Rabbit 4000
Kit Contents
RCM4200 Module, Prototyping Board, AC Adapter, Cable, Dynamic C CD-ROM, Getting Started Instructions
For Use With/related Products
RCM4200
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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The drain on the battery by the RCM4200 is typically 7.5 µA when no other power is sup-
plied. If a 165 mA·h battery is used, the battery can last about 2.5 years:
The actual battery life in your application will depend on the current drawn by components
not on the RCM4200 and on the storage capacity of the battery. The RCM4200 does not
drain the battery while it is powered up normally.
Cycle the main power off/on after you install a backup battery for the first time, and when-
ever you replace the battery. This step will minimize the current drawn by the real-time
clock oscillator circuit from the backup battery should the RCM4200 experience a loss of
main power.
Rabbit Semiconductor’s Technical Note TN235, External 32.768 kHz Oscillator Circuits,
provides additional information about the current draw by the real-time clock oscillator
circuit.
C.1.2 Battery-Backup Circuit
Figure C-2 shows the battery-backup circuit.
The battery-backup circuit serves three purposes:
• It reduces the battery voltage to the SRAM and to the real-time clock, thereby limiting
• It ensures that current can flow only out of the battery to prevent charging the battery.
• A voltage, VOSC, is supplied to U6, which keeps the 32.768 kHz oscillator working
120
the current consumed by the real-time clock and lengthening the battery life.
when the voltage begins to drop.
NOTE: Remember to cycle the main power off/on any time the RCM4200 is removed
165 mA·h
----------------------- -
7.5 µA
from the Prototyping Board or motherboard since that is where the backup battery
would be located.
=
Figure C-2. RCM4200 Backup Battery Circuit
2.5 years.
W
W
RabbitCore RCM4200
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