>Does anyone know of such Microcontroller ? I'm interested especially in
> martin "at" quickstep "punkt" dirnet "punkt" com
> Unix _IS_ user friendly - it's just selective about who its friends are
Try this design, the schematic is posted.Software is free. No special
programing unit needed. You can easily add a 12 bit a/d. We also sell a 12
bit a/d product that is easily interfaced with it.
Motorola 68HC11 CPU
32K Dallas battery-backed memory module, no need to use eproms or
Compact size 2" X 2.75"
Network capable, SPI interface. (1 Mbaud serial peripheral
Optional real time clock
Easily expandable, using standard headers. List of Headers:
Port A of 68HC11, 8 multi function I/O pins (JP8)
Port E of 68HC11, 8 analog channels (JP7)
Memory mapped I/O, Finger board can be easily expanded to
have 32 digital inputs and 32 digital output lines (JP9)
IRQ and XIRQ lines brought out for external interrupts
Standard serial port (P1)
SPI high speed serial interface, an easy way to attach
Memory mapped 14 pin LCD display (JP2)
6.3 to 18volts DC.
Can easily run from a 9volts DC battery.
Current consumption: 24 ma DC without communications board
< 10ma in WAIT mode, or STOP mode
30 ma with communications board
For remote data logging using an Alkaline 9volt battery we were able to
get 19 hours using the Finger Board without the communications board, but
with an attached LCD for display. The total current draw was ~25 ma. Yes,
surprisingly LCD displays typically draw ~1ma.
For low battery situations and Solar Cell applications. Special
modifications can be made to the Finger Board. With a few easy component
changes, we were able to bring the current draw down to 22ma. By changing
the voltage regulator to one that supplies less than 100ma, the Finger
Board was able to run from 26volts to 4.8volts. These application specific
modifications will be posted on our web for those who are interested.
CPU board only 2.75" long 2.0" wide
Communications board 1.45"
long 2.0" wide
CPU board with attached Communications board 4.2" long
Software and updates may also be downloaded from our WEB site.
Embedded Acquisition Systems
1565 Shrader Street
San Francisco, CA 94117