I M M 1 0 0
picture above shows 2 Simm100 boards (component
and solder side)
for the Atmel AVR microcontroller type AT90S8535.
|The picture above shows the Simm100 board mounted with an AT90S8535, MAX232, MAX701, Reset button and IDC connectors for RS-232, ADC and ISP (In System Programmable). To improve EMI, the board has a ground layer and a separate ground layer for the ADC for a stable Analog Conversion.
Click on the Schematics to enlarge
For minimum operation you have to install IC1, XTAL, C1, C2, C3, C11, C12 & R3. The XTAL can be exchanged to a resonator, then C2 and C3 can be omitted. When using the RC Reset (C12 / R3), you also need to jumper pin 1 & 6 of IC3, so the reset signal reaches the microcontroller. You can also add the PB1 pushbutton for a manual RESET if you do not have that on any other place (like e.g. on the DT003).
If you need a better power up (RESET), you should not install C12 / R3, instead install the IC3.
Then if you need ISP (In System Programmable) with a Kanda / Atmel STK200 compatible programmer, you need to install J2 and if you like to have indication when programming etc. also R2 and LD1.
If you want to use the ADC of the AT90S8535, then install R1 and C4 and optionally the J2 IDC connector. Jumper J1 is by default applying 5VDC to the AREF of the ADC and if you need any other reference voltage, cut that wire open on the board and install J1, so you can select a different reference voltage. pin 9 on the J1 connector could then be used for applying the new voltage reference. There is also a very small Prototype/Experiment area and one of the pads are connected to 0VDC (GND) and the other 5VDC (VCC).
To add on board RS-232, you need to install IC2, C5, C6, C7, C8, C9 and the J4 IDC connector. The J4 IDC connector is pin compatible with the SLI-OEM from Wirz, so adding a straight ribbon cable between the SIMM100 and the SLI-OEM makes it simple and easy to use a serial LCD.
If you do not have access to 5VDC and would like to use e.g. 9-12VDC then install the voltage regulator V1 and capacitor C10.
Finally the 2 user definable / general purpose LEDs (LD2 & LD3) plus the resistors for them (R4 & R5) could be mounted and controlled via PC0 & PC1 of the microcontroller, note that they sink current into the microcontroller, so turning them on need a LOW output (0VDC) and turning them off needs a HIGH output (5VDC).
J5 is also a small 4 pin connector for the rest of the PD port (PD4-7) that isn't routed out the the SimmStick bus.
|Microcontroller type AVR AT90S8535 or simular
|RS-232 Tranceiver type MAX202/232
|Reset circuit type MAX701
|C1, C4, C9,
|100nF (same as 0.1uF)
|1uF (if MAX232) or 0.1uF (if MAX202)
|4.7uF to 10uF depending on reset delay
|R2, R4, R5
|What ever frequency you need (Chrystal or Resonator)
|5VDC/1A voltage regulator type TO220 with screw for proper cooling
|LED for indicating ISP programming, normally 3mm RED
|LEDs for general purpose 3mm, color is up to you
|Jumper 3*1 pins
|10pin IDC connector
|Connector 4*1 pins
|Reset push button
|Demosoftware written in BASCOM-AVR is availible in zip format here (includes Basic source file and hex file). This simple program demonstrates how the on-board LED's can be turned on and off.
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