PAK-II Datasheet, PDF (11/28 Pages) List of Unclassifed Manufacturers – 310 Ivy Glen Court

is a simple matter to tie these lines together since
SOUT is open collector.
Therefore, the minimum number of lines you need
are two. An output for the clock and an I/O line to
connect to SIN and SOUT. You'll connect the
Enable/Busy pin to +5V and use a pull up resistor
to 5V on the Busy/Mode pin. This allows you to
reset the device and communicate with it. The only
problem is, you will have to make sure not to ask
the device for data while it is processing. Most
operations are quite fast, but some operations
(calculating digits and division, for example) can
take as much as 200uS with the provided
components.
For some applications, this isn't a problem. For
example, a standard Basic Stamp II can't operate
fast enough for this to be a problem except for
division and digit calculations. However, you may
want to know when the device is ready to process.
There are two ways you can accomplish this.
If you need to disable and enable the device, you'll
want to drive the Enable/Busy pin. Using this pin
allows you to share the SIN, SOUT, and CLK
lines with other devices that use a similar protocol.
So to connect 5 Paks you'd only need 7 I/O lines (5
enables, 1 SIN/SOUT, and 1 CLK line). You drive
the Enable/Busy pin low to disable the device. If
you don't plan to use this capability, just pull the
pin high with a pull up resistor. If you are using
the Busy/Mode input (see below) you can still use