Interest in AVR+MSP430 "general purpose" proto board?
- From: "larwe" <zwsdotcom@xxxxxxxxx>
- Date: 15 Apr 2007 19:50:54 -0700
While working on my next book, I've built a small general-purpose
prototyping board. This PCB is also intended to be useful for those
projects where someone says "please prototype this" and it requires a
micro that's only available in SMD.
Here are the schematic and component placement:
<http://www.larwe.com/temp/526-prelim-schematic.gif>
<http://www.larwe.com/temp/526-prelim-layout.gif>
The board is 5.1"x3.0", 0.062" FR4 with immersion tin (RoHS) finish, 2-
sided solder mask and component-side silkscreen. FR4 is *not*
guaranteed to survive Pb-free reflow profiles, and this board is not
checked against manufacturability design rules; it is strictly
intended for hand assembly only. Because of this, I have modified a
couple of the footprints to make hand-soldering easier (I'm thinking
particularly of the leadless accelerometer footprint).
The board includes footprints and interface circuitry for an SD/MMC
card slot in SPI mode, two Motorola pressure transducers, an ADXL322
2D accelerometer, an AVR ATmega48,mega88,mega168,mega8 or mega16 OR
ATmega32/64/128 chip (in TQFP), and either one or two MSP430F2013s (in
TSSOP; would also support other 20xx series parts since they have
basically the same pinout). Can be configured for a global Vcc=5V or
3V, has two RS232-level 3-wire serial ports, and offboard .100"
connections for all uncommitted I/O (as well as most of the onboard
signals). The AVR block has connections for ISP, debugWire and JTAG;
the MSP430s each have independent SBW debug connectors and watch
xtals. There is also a small, isolated area for a quad op-amp package
in SOIC, with appropriate component spaces and wiring around it to
configure each quarter as an inverting or non-inverting op-amp, with
an optional cap across the feedback resistor. The main reason I will
be using this space is impedance matching for external transducers to
the ADC channels.
Is anyone else interested in this board? I am planning to order 100
for myself, and if there is interest from others I will probably order
1K. I would likely be able to sell them for about $6.50 including
[U.S.] shipping.
Any suggestions on what you think is missing?
.
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