User`s manual

User’s Manual 51
B.1.1 Prototyping Board Features
• Power Connection—A 3-pin header is provided at J5 for the power supply connec-
tion. Note that both outer pins are connected to ground and the center pin is connected
to the raw V+ input. The cable from the wall transformer provided with the North
American version of the Development Kit ends in a connector that may be connected in
either orientation.
Users providing their own power supply should ensure that it delivers 7.5–25 V DC at
not less than 500 mA. The voltage regulator will get warm in use. (Lower supply volt-
ages will reduce thermal dissipation from the device.)
•
Regulated Power Supply—The raw DC voltage provided to the POWER header at J5
is routed to a 5 V linear voltage regulator, which provides stable power to the
RCM2300 and the Prototyping Board. A Shottky diode protects the power supply
against damage from reversed raw power connections.
• Power LED—The power LED lights whenever power is connected to the Prototyping
Board.
• Reset Switch—A momentary-contact, normally open switch is connected directly to the
master RCM2300’s /RES pin. Pressing the switch forces a hardware reset of the system.
• I/O Switches and LEDs—Two momentary-contact, normally open switches are con-
nected to the PB2 and PB3 pins of the master RCM2300, and may be read as inputs by
sample applications.
Two LEDs are connected to the PE1 and PE7 pins of the master RCM2300, and may be
driven as output indicators by sample applications.
The LEDs and switches are connected through JP1, which has traces shorting adjacent
pads together. These traces may be cut to disconnect the LEDs, and an 8-pin header
may then be soldered into JP1 to permit their selective reconnection with jumpers. See
Figure B-4 for details.
• Expansion Areas—The Prototyping Board is provided with several unpopulated areas
for expansion of I/O and interfacing capabilities. See the next section for details.
• Prototyping Area—A generous prototyping area has been provided for the installation
of through-hole components. Vcc (5 V DC) and Ground buses run around the edge of
this area. An area for surface-mount devices is provided to the right of the through-hole
area. Note that there are SMT device pads on both top and bottom of the Prototyping
Board. Each SMT pad is connected to a hole designed to accept a 30 AWG solid wire,
which must be soldered once it is in the hole.
• Master Module Connectors—When the RCM2300 plugged into the MASTER slots,
it can act as the “master” relative to another RabbitCore RCM2200 or RCM2300
plugged into the SLAVE slots, which acts as the “slave.”
This master/slave relationship is not used in the DeviceMate Development Kit where
the “target” RCM2300 is plugged into the MASTER slots, and the RCM2200, which is
used as the DeviceMate hardware platform, is plugged into the SLAVE slots. The Pro-
totyping and Demonstration Board serves only as a means to connect the two Rabbit-
Core modules together to demonstrate the DeviceMate software features in Dynamic C.