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Filtering ESD for CE compliance
I've been trying to filter ESD spikes using caps, ferrite beads, TVS diodes, capacitors, and schottkys but haven't succeeded. Details: I was told that using a modified BBQ...
Sunday, 13 June 2010 - 13:15
ADC not working with external reference
Hi, I'm using an ATTiny861 and have the ADCs working great with the internal 1.1V reference. When I switch to the external 1.225V reference, all the ADC channels read the max...
Thursday, 5 February 2009 - 07:21
Setting SPDR in SPI interrupt is not working
I've gotten SPI working fine from an Atmega644 as an SPI master. I'm trying to make the code interrupt-based. The interrupt routine psuedo-code is: SIGNAL(SIG_SPI) { u08...
Saturday, 13 December 2008 - 08:48
ATMega644 connected to ATTiny261. Can't program either!
I've got an ATMega644 and a ATTiny261 that are meant to talk to each other using MISO, MOSI, and SCK. I SUSPECT the fact that I connected them together this way ( using 330...
Saturday, 6 December 2008 - 18:52
Efficient One-Way FET?
I'm designing a circuit where I need to switch a 5A current on and off in one direction, but have it always blocked in the other direction. From what I've read, you can do this...
Thursday, 9 October 2008 - 09:14
Low-Side Current Sensing Alternate Ground?
I'm debating whether to do low-side or high-side current sensing for a 24V 5A load. Low-side current sensing is attractive because I won't need to level shift the voltage of the...
Tuesday, 16 September 2008 - 01:01
Connecting two AVRs using SPI - Why no resistors?
There's lots of posts talking about how to connect two AVRs by connecting the MISO, MOSI, SCK, and SS lines together. How come people don't talk about connecting them together...
Friday, 15 August 2008 - 09:32
ATTiny 261 package and pin compatable with ATTiny26?
I noticed that the Eagle libraries don't include the ATTiny261, 461, and 861 devices. Is this because they are package & pin compatible with the ATTiny26? Datasheets and...
Friday, 15 August 2008 - 09:28
EDA that supports "sub-systems"
Hi, I'm thinking of switching away from Eagle EDA and am looking for an EDA program that can create a "sub-system" around a bunch of components and then use this sub-system for...
Friday, 10 August 2007 - 02:23
Connecting Analog GND to Digital GND
I've looked through lots of posts, datasheets, and app notes, and found conflicting information about how to connect analog GND to digital GND. Which of the following is correct:...
Monday, 12 June 2006 - 12:48
Reset Monitor needed if BOD enabled for solar device?
I've noticed that some Olimex AVR prototyping boards use an external reset monitor ( ZM33064 ). I'm designing a solar powered device and need to figure out whether an external...
Tuesday, 6 June 2006 - 19:54
Serial AND reset with three pins -- bad hack?
I'm trying to minimize the number of connections that go to the outside of my device. I thought it would be nice to use a stereo audio minijack for serial programming AND for...
Monday, 22 May 2006 - 03:40

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