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Package & Pin Descriptions

The Propeller chip is available in the package types shown here. Pin descriptions are given in the table below.

P8X32A-D40

40-Pin DIP Package

P8X32A-Q44

44-pin QFP Package

P8X32A-M44

44-pin QFN Package

 

Pin Descriptions

Pin Name

Direction

Description

P0 – P31

I/O

General purpose I/O Port A.  Can source/sink 40 mA each at 3.3 VDC.  Logic threshold is ≈ ½ VDD; 1.65 VDC @ 3.3 VDC.

 

The pins shown below have a special purpose upon power-up/reset but are general purpose I/O afterwards.

P28- I2C SCL connection to optional, external EEPROM.

P29- I2C SDA connection to optional, external EEPROM.

P30- Serial Tx to host.

P31- Serial Rx from host.

VDD

---

3.3 volt power (2.7 – 3.3 VDC).

VSS

---

Ground.

BOEn

I

Brown Out Enable (active low).  Must be connected to either VDD or VSS.  If low, RESn becomes a weak output (delivering VDD through 5 KΩ) for monitoring purposes but can still be driven low to cause reset.  If high, RESn is CMOS input with Schmitt Trigger.

RESn

I/O

Reset (active low).  When low, resets the Propeller chip: all cogs disabled and I/O pins floating.  Propeller restarts 50 ms after RESn transitions from low to high.

XI

I

Crystal Input.  Can be connected to output of crystal/oscillator pack (with XO left disconnected), or to one leg of crystal (with XO connected to other leg of crystal or resonator) depending on CLK Register settings.  No external resistors or capacitors are required.

XO

O

Crystal Output.  Provides feedback for an external crystal, or may be left disconnected depending on CLK Register settings.  No external resistors or capacitors are required.

 

Propeller Help Version 1.1

Copyright © Parallax Inc.

5/13/2009