BASIC stamp manual v2.2

Introduction to the BASIC Stamp
Page 12 • BASIC Stamp Syntax and Reference Manual 2.2 • www.parallax.com
Pin Name Description
1 VIN
Unregulated power in: accepts 5.5 - 15 VDC (6-40 VDC on
BS1-IC rev. b), which is then internally regulated to 5 volts. May
be left unconnected if 5 volts is applied to the VDD (+5V) pin.
2 VSS
System ground: connects to BS1 Serial Adapter ground for
programming.
3 PCO PC Out: 4800 baud serial output (TTL level) to PC.
4 PCI PC In: 4800 baud serial input (TTL level) from PC.
5 VDD
5-volt DC input/output: (Also called +5V) if an unregulated voltage
is applied to the VIN pin, then this pin will output 5 volts. If no
voltage is applied to the VIN pin, then a regulated voltage
between 4.5V and 5.5V should be applied to this pin.
6 RES
Reset input/output: goes low when power supply is less than
approximately 4.2 volts, causing the BASIC Stamp to reset. Can
be driven low to force a reset. This pin is internally pulled high
and may be left disconnected if not needed. Do not drive high.
7-14 P0-P7
General-purpose I/O pins: each can sink 25 mA and source 20
mA. However, the total of all pins should not exceed 50 mA (sink)
and 40 mA (source).
Table 1.1: BASIC Stamp 1 Pin
Descriptions.
See the "BASIC Stamp Programming Connections" section on page 27 for
more information on the required programming connections between the
PC and the BASIC Stamp.