Power Supply - Rabbit RCM3000 User Manual

Table B-1 lists the electrical, mechanical, and environmental specifications for the Proto-
typing Board.
Board Size
Operating Temperature
Humidity
Input Voltage
Maximum Current Draw
(including user-added circuits)
Prototyping Area
Standoffs/Spacers
B.3 Power Supply
The RCM3000 requires a regulated 3.3 V ± 0.15 V DC power source to operate. Depend-
ing on the amount of current required by the application, different regulators can be used
to supply this voltage.
The Prototyping Board has an onboard +5 V switching power regulator from which a
+3.3 V linear regulator draws its supply. Thus both +5 V and +3.3 V are available on the
Prototyping Board.
The Prototyping Board itself is protected against reverse polarity by a Shottky diode at D2
as shown in Figure B-3.
J9/J11
1
2
3
66
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Table B-1. RCM30/31/32XX Prototyping Board Specifications
Parameter
5.30" × 6.775" × 1.00" (135 mm × 172 mm × 25 mm)
–20°C to +60°C
5% to 95%, noncondensing
8 V to 24 V DC
800 mA max. for +3.3 V supply,
1 A total +3.3 V and +5 V combined
2.0" × 3.5" (50 mm × 90 mm) throughhole, 0.1" spacing,
additional space for SMT components
5, accept 4-40 × 3/8 screws
SWITCHING POWER REGULATOR
D2
DCIN
+RAW
DL4003 C17
47 µF
LM2575
Figure B-3. Prototyping Board Power Supply
Specification
+5 V
U5
330 µH
L1
D1
1N5819
LINEAR POWER
REGULATOR
+3.3 V
LM1117
U1
3 2
1
340 µF 10 µF
RabbitCore RCM3000