28230 Parallax Inc, 28230 Datasheet - Page 3

• Manufacturer Part Number: 28230
• Description: MCU, MPU & DSP Development Tools Propeller Dev Board (MSR1)
• Manufacturer: Parallax Inc

Specifications of 28230

• Processor To Be Evaluated: P8X32A-Q44
• Interface Type: USB
• Dimensions: 77.5 cm x 102.9 cm x 13.4 cm
• Maximum Operating Temperature: + 70 C
• Operating Supply Voltage: 6.5 to 15 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Propeller P8X32A-Q44 [ 1 ]
The multi-core Propeller chip contains 8 cogs (processors) that can operate simultaneously, both
independently and cooperatively with other cogs, sharing access to global memory and the system clock in a
round-robin fashion through a central hub. Each cog has access to all 32 I/O pins, with pin states tracked in
its own I/O output and direction registers. Each cog also has its own memory, as well as two counter
modules and a video generator. See the Propeller Manual and datasheet in the Propeller Tool Help for more
information.
Socketed Crystal [ 3 ]
A 5 MHz crystal is included in the socket next to the Propeller chip. With the included crystal the Propeller
chip can run at 5, 10, 20, 40 and 80 MHz. By exchanging the crystal for one of a different value other
operating frequencies can be achieved. Refer to the Propeller datasheet for more information about using
external crystals.
L6205 Dual Full Bridge Driver (P24 – P27); Motor Sockets [ 4, 5, 6 ]
The L6205 driver is connected to the Propeller chip via I/O pins P24–P27.
P24 and P25 control Motor A while P26 and P27 control Motor B.
The L6205 used on the Propeller Robot Control Board is a Dual Full Bridge
Driver that offers many advantages in comparison to a simple H-Bridge
circuit alone. As a dual driver it can handle two motors at up to 2.8 A
(5.6 A peak) with an operating frequency of up to 100 kHz. The L6205
also
shutdown. Internal logic eliminates the possibility of an improper
configuration of the driver that might cause a short circuit. Connections to
the output of the H-Bridge are made through the Motor A and Motor B
socket’s connectors (Molex #0351560200).
Copyright © Parallax Inc.
2
provides
1
non-dissipative
3
64KB EEPROM (P28 – P29) [ 2 ]
The AT24C512 EEPROM (see the figure at left) chosen for the Propeller Robot
Control Board is 64 KB instead of 32 KB, allowing for extra memory to store
user data. This extra memory could be used for custom settings, GPS lookup
tables, map data or whatever you choose. This extra 32 KB is not overwritten
when programming the EEPROM via the Propeller Tool software. This means
that when you download a new program to the EEPROM the data in the upper
32K is not lost. The SCL line is connected to P28 and the SDA line is connected
to P29.
over-current
Propeller Robot Control Board (#28230)
protection
and
thermal
v1.0 11/3/2009 Page 3 of 9
5
4
6
12
1