Propeller Simple Spin Board Update

PROPELLER SIMPLE SPIN BOARD UPDATE
This update includes the new v1.2 version schematic for the Propeller Simple Spin Board.

Those of you building the BOE disable circuit can now follow the added schematic detail to activate the disabling.

This schematic replaces v1.1 in the following post:
Brain Cortex Update Part 6
and here
http://humanoidolabs.blogspot.tw/2013/07/propeller-simple-spin-board-part-2.html

The additional crisscross wiring improves chip reliability. The BOE disable circuit also requires the 220 ohm resistor from VDD to RESn.

Propeller Simple Spin Board Part 1
Propeller Simple Spin Board Part 2
Propeller Simple Spin Board Part 3
Propeller Simple Spin Board Part 4 & 5
Bare Bones Propeller
Propeller Spin Brain Part 1
Propeller Spin Brain Part 2
Supertronic Spin Brain
Cherry Pie Tiny Super Computer Wannabe
How Slow Can You Go? Processing Speed

Propeller Simple Spin Board Part 4 & 5

Experiment 4: crisscross wiring

PART 4 & 5 - IMPROVING RELIABILITY
PROPELLER SIMPLE SPIN BOARD
The Propeller Simple Spin Board will be expanded more in the future. Let's make some preliminary preparations for this and improve its reliability. While in it's RC speed state with RCFAST and RCSLOW, the circuit is already reliable and durable.

Experiment 5: decoupling

 









However, at higher clock speed, overclocking, with unusual loads or demands, electrical pressures and imbalances occur internally inside the chip, which is also effected with various operational configs. These conditions are not always for the better. However, it's possible to improve the operation of these circuits with external wiring and components.

Although it's a lot of technical mumble jumble jargon to describe it, basically the Propeller needs decoupling capacitors on each side of the dip chip, as close as possible to Propeller pins VSS and VDD, and a special added "criss-cross" wiring. Propeller experts say both the connective wiring and the capacitors (use a .1 uf value) belong to the chip and help to prevent blowing out the PLL circuits inside the chip.

The wiring connects one side of the chip to the other side. Ground VSS on one side (use a green or black wire) is connected to ground VSS on the other side, and power VDD (use a red wire) on one side is connected to power VDD on the other side. Use shortest wires that run directly over the top of the chip. This circuit will balance the chip's internal circuitry and help prevent a condition that could damage the chip. With these improvements installed, the Propeller chip is ready to run extremely fast and do much more than we ever expected. Stay tuned for more.

Another possible requirement involves using the addition of 10uf and 100uf capacitors for when the Propeller is expanded with additional demands. Due to limitations of breadboard pins nearest the chip, these capacitors may or may not connect at the power rails position.