507 / Patriot Users Manual
Release 1.01
March 10, 2015
Part #74485
Printed in USA
Page
9
of 15
Figure 4 – Internal Layout
4. 507 Internal Adjustments
and Connections
(Refer to Figure 4 above)
4.1 Speaker/Headphone Selection
A 2-pin header and jumper for
speaker/headphone selection is located in the
right rear portion of the PC board just behind the
speaker/headphone jack. The jumper is placed
over both pins for speaker operation. This is the
default as shipped from the factory. This
bypasses a resistor that reduces volume for
headphone listening. The jumper is removed for
headphone operation. When using headphones,
the jumper can be stored in place by moving it
so that it covers just one pin.
4.2 8-bit Expansion Port
There is an additional 8 pin socket at the rear of
the PCB. This will allow for extra inputs or
outputs when different code is written for the
ChipKit Uno32. The connections connect to an
MCP23017 I2C port expander. While this I2C
port expander is used already by the factory
code for some functions, the port B group,
GPIOB 0 thru 7 go to this 8 pin socket for
customer usage.
A quick review of the factory code and the
MCP23017 data sheet will help in understanding
how the part works.
Keep in mind that additional I2C code may
affect the performance of the 507.
