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Discussion Title Created date
DC to DC converter
I need to convert 12VDC to approx. 40VDC@140ma. A small foot print is important. Can anyone suggest a circuit or IC to do this job? Thanks. A
Friday, 11 July 2008 - 16:43
Addressing external ram ATmega640
Hi all. I need to hang 32K of SRAM on the external bus of the ATmega640. I have read the manual and appears to show that the memory location can be either partially overlapped or...
Friday, 11 July 2008 - 16:30
Ground and power planes.
I am just finishing a board design and my router has done some things that I am not comfortable with. The pads that are connected to the internal gound and power planes are also...
Wednesday, 9 July 2008 - 16:16
Power pins?
Is it necessary to connect all of the power pins on a ATmega640? Thanks A
Monday, 7 July 2008 - 16:40
HP catridge info
Does anyone have any info on how to drive an HP45 or HP15 cartridge. Even a link would be appreciated. Thanks A
Wednesday, 2 July 2008 - 15:22
To JTAG or not to JTAG.
Hi, I am trying to determine if it is worth the effort to impliment a JTAG port on a new design. To date have been using the tried and true burn and learn method. The design is...
Thursday, 26 June 2008 - 13:59
8032 to ATmega640
We are a small operation that over the years accumulated some 5M lines of code, mostly in C. ( non-ANSI ). We reaching some speed and memory limits with our current designs. Just...
Monday, 23 June 2008 - 14:58
Looking for Atmega640s
Can anyone suggest a source for low quantity (
Friday, 20 June 2008 - 17:46
Complex grounds???
I am working on a project that uses many types of I/O. D/A, A/D, Digital I/O, motor speed control and high voltage amps(250VDC) all on the same board. All of the sub-circuits...
Monday, 2 June 2008 - 21:30
ATmega640 power limits
I am considering a 640 for use in a system that will use most if not all of it's I/O ports. Does anyone have any thoughts on the the number of 74LS loads that can be run from a...
Thursday, 1 May 2008 - 15:27
Micro packaging
We run a small shop and most of our products have been assembled in house. A new project may require the use of an ATmega640 in either a CBGA100 or a TQFP100 package. Any...
Monday, 28 April 2008 - 15:35
90S8515 OC1A Problem
I am using TIMER1 to create a pulse on OC1A. The simulator shows that the activity on the pin is correct. ie. The pin is set high directly and after the counter matches the pin...
Saturday, 3 February 2007 - 13:05

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