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MCU as SPI slave, not easy?
Hi freaks, I'd like to hear some suggestions how you have implemented a SPI slave with a microcontroller. I need to replace a current slave chip with a MCU and be mostly...
Mon. Jul 7, 2014 - 08:12 PM
suggestion for N-FET driven by 3V MCU
So my component-fu skills have gotten a bit outdated, and I tried to select something like 2N7002 or BSS138 to drive a bunch of relays with 3.3V MCU. Those would work great with...
Wed. Jan 22, 2014 - 01:38 PM
Level shift 3V3 1kHz PWM to 12V
I am considering what would be the "best" way of level shifting two signals from 3.3V micro to 12V logic levels. The other signal is a 1kHz PWM signal, other is just on/off...
Mon. Nov 11, 2013 - 02:05 PM
Switching between standby and main voltages to power chips
I need to power some noise-sensitive mixed signal chips with both 3.3V and 1.8V. Noise sensitivity can be taken care of with 3.3V and 1.8V LDO. The problem is, the chips need to...
Wed. Aug 15, 2012 - 09:10 AM
How to receive 200mV signal, convert to 3.3V levels
Damn datasheet errors hit me again. A chip claims to output LVTTL level output for a received signal, but in reality the signal output AC level is same as received signal, riding...
Tue. Jul 31, 2012 - 12:50 PM
Suggest MUX like 74HC4052 for 3.3V I2C bus
I have a board that has an onboard I2C bus (or two internal buses actually), and one of the buses is now also required to access slave devices external to the board. Because the...
Tue. Jul 17, 2012 - 11:50 AM
Resistor power ratings in surge conditions?
Hi, I have read many resistor datasheets but can't find a curve or anything that would relate to resistors being used in surge conditions, only steady-state DC or AC conditions....
Thu. Nov 3, 2011 - 12:27 PM
Downloading STM32 firmware in Linux?
I gather many people here have some experience in STM32 microcontrollers, but do you happen to use Linux for developement? I know also people use OpenOCD to download firmware via...
Tue. Nov 1, 2011 - 01:23 PM
How to handle power on/off sequencing?
So I have this relatively difficult system to power, it needs three voltages to operate, 5V before anything else, then after it has been stable long enough, 3.3V and 1.2V can be...
Thu. Sep 29, 2011 - 12:27 PM
Help fixing AVRISP, it has broken AT90LS8535
OK, so I borrowed my AVRISP to a friend and he bricked it. I am unsure if it suffered some overvoltage through ISP or did it die during upgrading of the AVRISP firmware itself (...
Tue. Jul 26, 2011 - 08:43 AM
Measuring (pin, trace and wire) capacitance?
I regularly find myself being worried about whether a design meets requirements for electrical specification or not. One of the parameters is how much a connected device can load...
Tue. May 10, 2011 - 08:17 AM
Need MCU with display controller
Does anyone have idea what would be the cheapest model from Atmel (or other manufacturer) that has integrated display controller that could output standard VGA 640x480@60Hz in...
Wed. Apr 27, 2011 - 12:33 PM

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