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Thank you! I was barking up a wrong tree when I thought that the additional 20mA was drawn through the NRST pin. Your question had set me in the right direction, and I found the actual cause of the problem.
I have a constant current circuit controlled by a DAC in the STM32. The DAC pin...
Colleagues,
I’ve made a custom board with STM32L082KZ. I was able to upload firmware and debug for several days. But today I can’t upload firmware, and the NRST pin is acting strangely.
The setup
I’m using ST-link V2 and STM32cubeIDE 1.13.0 .
My entire board consumes around 20mA normally...
Folks,
I have two questions about the buffer. I suspect that these questions may be related to each-other. I wonder what’s your hands-on experience with the STM32 DACs.
Q1. The datasheet (p.96) mentions that the minimum DAC output voltage V_DAC_OUT is 0.2 V when the buffer is enabled. That...
I've compiled a list of application notes, book chapters, tutorials about circuit design with current-feedback op-amps
http://prolifictec.com/blog/2023/04/current-feedback-op-amps-reading-material.html
CFB, CFA
Folks,
I’ve got a 0.5m cable which consists of eight 100Ω differential pairs. Six pairs are used for high speed differential signals (450MHz). I want to use one of the remaining pairs for sending a 24 MHz reference clock. The clock is single-ended. The receiver of the clock is also...
Folks,
Does a tiny 30mAh Lithium-polymer battery require a protection circuit? Do Lithium-polymer batteries have an "intrinsically safe below certain size" limit?
I'm posting this question to the Professional Design rubric, because I'm interested in this question from a standards standpoint...
Klaus, do you think that I haven't checked existing I2C level translators ICs before posting my question here?
You have my permission to post something useful next time.
Colleagues,
Is there a good method for level-translating the I2C in the following situation?
The I2C bus master and most of the slaves are powered from a +3.3V rail. One of the slave devices is powered from a different rail which can vary between +2.8V and +4.2V. Notice that this rail can...
Colleagues,
I'm making a pulsed current sink. It will be a low side constant current sink, which will consist of an OpAmp, a current sense resistor, an NPN transistor.
The output current will be up to 16mA. The voltage drop across the the transistor will be up to 100V. Pulse duration will...
I agree that frequency is easier to distribute as a digital signal. But ultimately, I need to have a sine wave. What method can you recommend for getting a sine wave from the digital signal?
Low-pass filtering is the first thing that comes to mind, of course. But my frequency will not always...
Colleagues,
How could one distribute a 108MHz sine wave (generated by a PLL) across several boards? The are 4x identical recipient boards. These boards live in one a narrow tube 20mm across, and they are spaced 0.5m apart (total length 2m).
If I could use coaxial cables and connectors, then...
Folks,
I've searched the datasheet for MSP430G2210, but I can't seem to find how much can its I/O pin source and sink. The only number I was able to find was 48mA max *combined* for a port. What I want to do is to drive an LED with 10mA. Either way would do: source or sink.
Does anyone...
Folks,
Out there is there a good app note on tools and techniques for measuring low power microcontroller modes? How does one usually go about measuring the consumption at the low power modes? uA levels.
Imagine the situation when sleep current is in single-digit uA (micro), and active...
OrCAD. Clearance between copper pour and board outline
Folks,
I’m laying out a PCB with an intricate outline. First, I drew the outline (yellow in the picture below). Then I’ve added a copper pour at the top layer (blue in the picture below), but a clearance between the outline and the pour...
Folks,
Do battery charge controllers usually disconnect the input from the battery, when the external supply voltage is not present? In particular, I'm looking at MCP73832.
The datasheet says:
I wonder if power Power-Down mode includes disconnecting the battery from the input. The block...
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