User`s manual

76 RabbitCore RCM3400
Table B-1 lists the electrical, mechanical, and environmental specifications for the Proto-
typing Board.
B.3 Power Supply
The RCM3400 requires a regulated 2.8 V – 3.45 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.
Figure B-3. Prototyping Board Power Supply
Table B-1. Prototyping Board Specifications
Parameter Specification
Board Size 4.80" × 6.70" × 0.98" (122 mm × 170 mm × 25 mm)
Ethernet Port 10/100Base-T, RJ-45, 2 LEDs
Operating Temperature –20°C to +60°C
Humidity 5% to 95%, noncondensing
Input Voltage 8 V to 24 V DC
Maximum Current Draw
(including user-added circuits)
800 mA max. for +3.3 V supply,
1 A total +3.3 V and +5 V combined
Prototyping Area
2" × 4" (50 mm × 100 mm) throughhole, 0.1" spacing, additional
space for SMT components
Connectors
Two 2 × 17 header sockets, 1.27 mm pitch, to accept RCM3400
One 2 × 5 IDC programming header, 1.27 mm pitch
One 2 × 5 IDC RS-232 header, 0.1" pitch
Two screw-terminal headers for RS-485 signals and analog inputs
Two unstuffed header locations for RS-232 and RCM3400 signals
Standoffs/Spacers 6, accept 4-40 × ½ screws
LINEAR POWER
REGULATOR
POWER
IN
J8/J9
10 µF
LM1117
U10
+RAW
+3.3 V
3
1
2
1
2
3
DL4003
D2
47 µF
10 µF
+5 V
L1
C61
330 µH
D1
1N5819
SWITCHING POWER REGULATOR
DCIN
U12
LM2575