PAK-II Data Sheet
© 1998, 1999 by AWC
AWC
310 Ivy Glen Court
League City, TX 77573
(281) 334-4341
http://www.al-williams.com/awce.htm
V1.2
Overview
The Stamp Pak II is a 32-bit floating-point math
coprocessor with a versatile interface that makes it
easy to interface it with a variety of
microcontrollers including the Basic Stamp from
Parallax. However, you can easily interface the
Pak II with practically any modern
microprocessor. The Pak II can add, subtract,
multiply, and divide numbers between +/-
6.80564693 x 10
38
. The smallest number the Pak II
can represent is +/- 1.17549435 x 10
-38
. Here are
some of the Pak II's major features:
•
Robust, speed independent serial interface
•
Uses as few as 2 pins to connect to the host
•
Can connect multiple devices to the same 2
pins with one additional pin per device
•
Can work with IEEE754 floating point
numbers
•
Works with Stamp II's ShiftOut and ShiftIn
commands
•
Synchronous operation – read results when you
are ready for them
•
Adds 16-bits of general-purpose digital I/O
pins
•
Fast 20Mhz speed (can be reduced to save
power)
•
Easy to use
The Pak II is a standard 28-pin .3” IC. In order to
operate it must have a regulated supply of 5V and
connection to a clock element. The Stamp Pak II
includes a 20MHz ceramic resonator that you can
use to clock the chip.
Other than the power and clock connections, the
Pak II requires at least two wires to connect
between your microcontroller (the host) and itself.
Depending on the host's capabilities and your
application, you may want to use more pins for I/O
(up to 5 pins).
If You Need Help
If you require assistance with your PAK-I,I please
feel free to contact us. The best way to get support
is via e-mail (stamp@al-williams.com). However,
you may also call between 9AM - 4PM Central
Time at (281) 334-4341. You can also fax to (281)
538-2147. Be sure to check out our Web page for
updates at www.al-williams.com/awce.htm.
Registering Your PAK-II
Please take a moment to register your e-mail
address with AWC. Simply send an e-mail
message to pakreg@al-williams.com. AWC will
not make your address available to other
companies, but we may periodically send you
updated technical notes. You’ll also receive
information about new microcontroller products
1
RESET
ENABLE/BUSY
BUSY/MODE
A7
A6
A5
A4
A3
A2
A1
28
2
27
3
26
4
SIN
SOUT
CLK
Vss
25
5
24
6
23
7
22
21
8
PAK-II
Vss
RES1
RES2
B0
B1
B2
B3
A0
Vdd
Vss
B7
B6
B5
B4
9
20
10
19
11
18
12
17
13
16
14
15
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