DT101 PIC SimmStick CPU Board
A PicStic equivalent on a SimmStick, on a 1.05" x 3.5" double-sided plated-through solder-masked Silk Screened 1.26mm thick Printed circuit Board.
It supports any 18 pin PIC16Cxx Micro and it will cater for the FED Interpreter Basic and the microEngineering Labs PicBasic compiler.
DT101 Circuit - click here
DT101 Datasheet - in PDF - click here
1 x DT101 PCB 1 x 780L5 +5V regulator in TO-92 case (Optional) 1 x Capacitor C1 .01uf (or .1uf) Ceramic 1 x Capacitor C2 .01uf (or .1uf) Ceramic 1 x Capacitor C3 15pf to 22pf Ceramic
Install C3 & C4 only if Crystal is installed 1 x Capacitor C3 15pf to 22pf Ceramic 1 x Capacitor C4 15pf to 22pf Ceramic 1 x Resistor R1 10K .25 watt 1 x Resistor R2 10K .25 watt 1 x Resistor R3 10K .25 watt R1, R2, and R3 must always be installed, even if you don't use a brown-out circuit.
(Install R4 & R5 only if EEPROM is installed) 1 x Resistor R4 10K .25 watt 1 x Resistor R5 10K .25 watt
1 x Crystal - include C3 and C4 OR 1 x 3 pin Resonator - omit C3 & C4
The most common crystal used for beginners is 4Mhz, as this matches the
All caps (C5-C8) are Electrolytic/Tant. 16V-PCB mount 1 x Capacitor C5 1uf 1 x Capacitor C6 1uf 1 x Capacitor C7 1uf 1 x Capacitor C8 1uf 1 x MAX-232 E2 (or equivalent)
It may also pay to install a 16 pin socket for the Max-232, as you may have to remove it for some configurations.
Real Time Clock:
The Panasonic NJU-6355 requires a crystal with a load capacitance of 12pf.
Analog to Digital Converter
Most common A/D chips will fit this 8 pin DIP layout. Although the original PicStic used an LTC1298, a simple National ADC0831 will fit the same socket.
Sample code for both the NJU-6355 RTC and LTC-1298 A/D can be
found at Micromint's PicStic(tm) site at http://www.micromint.com/modules.htm
This has Circuits, Overlays, Code, Data Sheets for the 1, 2, and 3 PicStic.
This small TO-92 IC is used to prevent the Micro operation becoming unpredictable during a power 'brown-out'. In most cases this isn't required. It's just an added precaution for reliable operation. The older PIC16C5x may well need this device.
To use the brown-out detector, just add it to the board, and can be either a CMOS or Open Collector type.
You can use the following brownout detector ICs:
Other types may also be suitable. For 5V operation, they should switch between 4.2 and 4.6 Volts.
R1, R2, and R3 MUST BE INSTALLED
for normal operation.
By simply ignoring the brown-out circuit and installing resistors R1 and R2, circuit operation should be fine.
Users who want to access an EEPROM on the DT101 PCB's using the MEL complier need to edit the PIC.PBL file to reverse the Pin allocation for the I2C function (SDA & SDL). from Wolf Maier SCORPIA DESIGN 4-Sep-98.
DT101 CPU Board + Prototype Area - DT111
The DT111 is simply the DT101 Simmstick with an extra 1" of prototype area. The schematic and overlay are the same except for this additional 1 inch of prototype area. The prototyping area can be used to connect the Basic Stamp One 93LCxx type EEPROM.
All rights reserved © 1999-2005 Giovanni Moretti Palmerston North, New Zealand