PAK-IV Datasheet, PDF (3/14 Pages) List of Unclassifed Manufacturers – Using the PAK-IV I/O Coprocessor

Overview
The Stamp Pak IV is a16-bit I/O 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 IV with practically any modern
microprocessor. Here are some of the Pak IV'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
• 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
• 96 bytes of RAM storage
• Advanced I/O features (PWM, Count, Pulse I/O, etc.)
• Easy to use
The Pak IV is a 28-pin .3" wide IC. In order to operate it must have a regulated supply of
5V and connection to a clock element. The Stamp Pak IV includes a 20Mhz ceramic
resonator that you can use to clock the chip.
Other than the power and clock connections, the Pak IV 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.
1
RESET
2
ENABLE/BUSY
3
BUSY/MODE
4
SIN
5
SOUT
6
CLK
7
Vss
8
Vss
PAK-IV
9
RES1
10
RES2
11
B0
12
B1
13
B2
14
B3
28
A7
27
A6
26
A5
25
A4
24
A3
23
A2
A1 ²²
21
A0
20
Vdd
19
Vss
18
B7
17
B6
16
B5
B4 ¹⁵