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A device which includes a central processing unit (CPU), memory, and (generally) an assortment of I/O peripherals (UART, ADC, DAC, general-purpose I/O, I2C, etc.) in a tightly-coupled standalone package.

2
votes
There are several issues with switched connectors in an ISP app: Too few pins! Switched connectors are only available in configurations with a few (2, 3, maybe 4) contacts -- many in-circuit program …
answered Sep 16 '17 by ThreePhaseEel
1
vote
that latches the value to be output onto the data bus and holds onto it while the CPU goes off and does other things. (This is often called PORTx or the likes in microcontroller datasheets, and yes …
answered Aug 3 '17 by ThreePhaseEel
2
votes
ESD diodes can be a drag You are correct that U2 can be powered this way -- I've seen this before when trying to hook programming cables up to otherwise unpowered circuit boards, aggravated by the ty …
answered Dec 14 '16 by ThreePhaseEel
1
vote
You have the wrong coupler In order to use a N-channel FET here, you need to be able to pull its gate above its source, which your 4N35's transistor output has no ability to do. What you need instea …
answered Aug 25 '17 by ThreePhaseEel
4
votes
It should indeed work The Vih on the TXD pin of the CAN transceiver you're using is 2.0V, while the Voh for the STM32 is 2.4V; considering that the STM32 family has 5V tolerant input pins for most of …
answered Aug 8 '17 by ThreePhaseEel
2
votes
1answer
Most internal watchdog timers found on microcontrollers contain mechanisms to prevent an inadvertent feed, usually requiring the write of a specific key-value to the feed register, although some watch …
asked Nov 23 '18 by ThreePhaseEel
1
vote
(the MCP2515 is one that is designed for simple microcontroller interfacing). Furthermore, IP over CAN is possible and documented, and CAN cards are available for PCs (including Linux support, although …
answered Sep 5 '16 by ThreePhaseEel
0
votes
And this is why SPI is but only a convention... The AT89LP51ED2 USART, for all it has up its sleeve, simply cannot be convinced to sample the serial data line mid-cycle (i.e. while SCK is solidly HIG …
answered Dec 17 '16 by ThreePhaseEel
1
vote
Keep the extra caps, but make them into a parallel bank The rule of thumb of "one decoupling capacitor per power pin", while sound, does not say anything about how they should be laid out on the PCB. …
answered Feb 7 by ThreePhaseEel
7
votes
Your Analog Front End is a very important tool in getting quality conversion results from your ADC There are four basic problems with connecting an ADC input directly to the "outside world": ADC in …
answered Sep 7 '16 by ThreePhaseEel
3
votes
If you want a more compact way to do a digital input, use an optoisolator The way real PLCs sense the presence or absence of mains at an input out in the real world is using an optoisolator in the in …
answered Sep 9 '18 by ThreePhaseEel
2
votes
1answer
So, I am trying to receive synchronous serial data from a DS1306 in 3-wire mode using mode 0 of my AT89LP51ED2's USART. However, my serial read routine is returning all 1s instead of valid data, even …
asked Dec 16 '16 by ThreePhaseEel
1
vote
You're quite close -- the regulator will be in dropout at end-of-battery-life with 3 AAs though as 3x0.9V only makes for 2.7V, not enough for a 3.3V LDO. Sticking to 4AAs or USB power is fine though. …
answered Jul 9 '16 by ThreePhaseEel
1
vote
First -- your snubber network should be across the contacts, AND C5 needs to be changed for a 250VAC X2 capacitor to keep it from being toasted by surges and other junk on the mains. Beyond that, if …
answered Jun 11 '16 by ThreePhaseEel
1
vote
-485 networks and microcontroller UARTs. I'd recommend going with either an external UART for the Pi that can support the 9-bit mode properly, or using an I2C-over-RS485 network instead of UART-over …
answered Nov 23 '16 by ThreePhaseEel

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