28158 Parallax Inc, 28158 Datasheet - Page 2

• Manufacturer Part Number: 28158
• Description: BOARD HOMEWORK BASIC STAMP(10PK)
• Manufacturer: Parallax Inc
• Series: BASIC Stamp® 2r
• Type: BASIC Stamp Kitr

Specifications of 28158

• Contents: Development Board
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: BASIC Stamp® 2 and Board of Education
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Package Contents
The BASIC Stamp HomeWork Board is sold separately only in quantities of 10. The reason for this is that the
board is intended for the educational market only, to be purchased by educators for use in their classrooms. The
kit includes only the boards – nothing else. However, a single HomeWork Board is included as part of the BASIC
Stamp Activity Kit, (#90005) which is the most economical complete kit to learn BASIC Stamp programming.
BASIC Stamp HomeWork Board Hardware Design
The HomeWork Board uses the BASIC Stamp 2 surface-mounted directly to the printed circuit board. The BASIC
Stamp 2 has a wide variety of available support hardware, code examples and applications. Furthermore, it
performs most of the same functions of the newer BASIC Stamp models though with less speed and memory.
The BASIC Stamp 2’s technical specifications are shown below (Table 1). Also review the hardware (Figures 1
and 2) and schematic (Figure 3).
Copyright © Parallax, Inc.
HomeWork Board
Table 1
BASIC Stamp
Specifications
Microcontroller
Speed
EEPROM
Program Length
RAM (variables)
Input / Outputs
On-board BS2 per I/O
Source / Sink Current:
Vdd Source Current
Serial Communication
Current Requirements
PC Interface
Power Supply
Environment:
HomeWork Board Size
Project Area
#28158 BASIC Stamp HomeWork Board v1.3 1/10/2007
Rev A, B, C: PIC16C57 surface mount
Rev D: PIC16F57 surface mount
20 MHz / ~4,000 instructions per second
2K bytes (program and data)
~500 to 600 lines of PBASIC
32 bytes (6 for I/Os and 26 for variables)
16 (up to 17 RS-232 communication ports)
20 / 25 mA (40 / 50 mA per 8 I/O pins)
Rev A, B: 50 mA
Rev C, D 500 mA
300-50K baud I/O; DB9 Female connector
7 mA running, 50 µA in sleep
Serial port, DB9
5 V through 50 mA regulator (Rev A, B) or
500 mA regulator (Rev C, D) from a 9V
transistor battery
32 to 158° F (0 to 70° C), 70% non-
condensing humidity
3” x 4”
Built-in breadboard: two 5-socket row x 17
column, 0.1 inch spacing
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