101-0681 Rabbit Semiconductor, 101-0681 Datasheet - Page 162
101-0681
Manufacturer Part Number
101-0681
Description
KIT DEVELOPMENT RCM3700 INT'L
Manufacturer
Rabbit Semiconductor
Series
RabbitCore 3000r
Type
MPU Moduler
Datasheet
1.101-0522.pdf
(169 pages)
Specifications of 101-0681
Contents
RabbitCore Module, Dev. Board, AC Adapter, Cable and Dynamic C® CD-Rom
Processor To Be Evaluated
Rabbit 3000
Interface Type
Ethernet
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
- 40 C
Operating Supply Voltage
4.75 V to 5.25 V
For Use With/related Products
RCM3700
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
101-681
101-681
101-681
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Part Number:
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D.1.2 Battery-Backup Circuit
Figure D-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 U5, which keeps the 32.768 kHz oscillator working
D.1.3 Reset Generator
The RCM3700 uses a reset generator to reset the Rabbit 3000 microprocessor when the volt-
age drops below the voltage necessary for reliable operation. The reset occurs between
2.85 V and 3.00 V, typically 2.93 V.
The RCM3700 has a reset pin, pin 36 on header J1. This pin provides access to the reset
output from the reset generator, and is also connected to the reset input of the Rabbit 3000
to allow you to reset the microprocessor externally. A resistor divider consisting of R22
and R23 attenuates the signal associated with an externally applied reset to prevent it from
affecting the reset generator.
RabbitCore RCM3700 User’s Manual
the current consumed by the real-time clock and lengthening the battery life.
when the voltage begins to drop.
Figure D-2. RCM3700 Backup Battery Circuit
W
W
W
160
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