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Hi Guys,
I have seen the soft on/off switch circuit given by the following link (schematic shown below).
https://www.picbasic.co.uk/forum/showthread.php?t=57
I have been trying to implement the same solution for my application. I have a PCB which is PIC controlled and need a soft on/off...
Thanks for all your input. After a bit of butchering of the PCB found the problem.
It was a SW problem after all... The pin was not properly initialised as an output - therefore the signal was left floating! I had a function call to initialise the pin as an output - but never called the...
But then why would I not be able to measure the signal voltage level using the oscilloscope?
I can understand that the pull down will help pull the signal "low". But if I hold it high using the PIC, should this not be measurable? or even if I held it low?
The actual components I use are a...
Hi,
I have a pic connected to a MOSFET switch. One of the outputs of the PIC should enable/disable the MOSFET.
However, I have found that the MOSFET is switched on at all times - regardless of which state I program the PIC output to be.
If I touch the output trace with an oscilloscope probe...
Thank you for the your detailed answer Keith.
Can you please confirm the following calculation based on what you said - but modified to include run time.
5V line, 0.3A together with 80% efficiency requires 1.88W.
3.3V lines, 0.3A together with 80% efficiency requires 1.24W.
the 5V line will...
When doing the power calculation for the battery, I have not used watt hours - but Amphours. Should this be changed?
I have used a formula that calculates the current x time - add 20% extra for 80% efficiency and divide the battery mAh value by the result. This I thought was the number of...
I have a question about batteries and how much energy they store.
I am looking at using a Lithium battery for a portable instrument - the two choices I have are 14.8V 4.4Ah or 11.1V 4.4Ah.
The voltages I work with are 5V and 3.3V and generally the instrument will use around 400-500mA during...
Hi all,
I want to use a load switch as a switch to turn on and off the power to support circuitry that I have. A microcontroller which will be powered ON at all times will provide the control signals. I have a couple of questions on load switches.
I was planning to use a Vishay Si1869dh load...
hi guys,
I am trying to designa SAR adc circuit. The input is provided by an image sensor which has a output offset voltage of 0.7V. The analog output can be of 200K to 5MHz frequencies.
I was thinking of using a capacitor to remove the offset. However, I am concerned with the frequncy, this...
OK - I am sorry if I am not making myself very clear.
This is related to EDA - electronic design automation.
It is to do with chip designing - and the place and route side of it.
Standard cells and macro cells are what makes up the chip - and I am looking for areas where only macro cells may...
Hi,
I am wondering if anyone can tell me areas where placement tools for macros/blocks may be of use? I am thinking of designs that may contain either pure macro cells or ones that may have a minimal amount of standard cells along with macro cells.
- Audette
how to understand def format, cadence
Hi,
I want to benchmark the place and route of the Cadence SOC encounter tools as part of my studies, but all the benchmarks I've got are in LEF/DEF format. I am new to the Cadence tools as well.
I know that the cadence tools need to read in a verilog...
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