BASIC stamp manual v2.2

1: Introduction to the BASIC Stamp
BASIC Stamp Syntax and Reference Manual 2.2 www.parallax.com Page 23
Basic Stamp 2px
Figure 1.12: BASIC Stamp 2px
(Rev. A) (Stock# BS2px-IC)
The BASIC Stamp 2px is available in the above 24-pin DIP physical
package.
Table 1.7: BASIC Stamp 2px Pin
Descriptions.
Pin Name Description
1 SOUT
Serial Out: connects to PC serial port RX pin (DB9 pin 2 / DB25 pin 3)
for programming.
2 SIN
Serial In: connects to PC serial port TX pin (DB9 pin 3 / DB25 pin 2)
for programming.
3 ATN
Attention: connects to PC serial port DTR pin (DB9 pin 4 / DB25 pin
20) for programming.
4 VSS
System ground: (same as pin 23), connects to PC serial port GND pin
(DB9 pin 5 / DB25 pin 7) for programming.
5-20 P0-P15
General-purpose I/O pins: each can source and sink 30 mA.
However, the total of all pins should not exceed 75 mA (source or
sink) if using the internal 5-volt regulator. The total per 8-pin groups
P0 – P7 or P8 – 15 should not exceed 100 mA (source or sink) if
using an external 5-volt regulator.
21 VDD
5-volt DC input/output: 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.
22 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.
23 VSS
System ground: (same as pin 4) connects to power supply’s ground
(GND) terminal.
24 VIN
Unregulated power in: accepts 5.5 - 12 VDC (7.5 recommended),
which is then internally regulated to 5 volts. Must be left unconnected
if 5 volts is applied to the VDD (+5V) pin.