Search Engine www.edaboard.com

76 Threads found on edaboard.com: Switch With Clock
Hello, My Cyclone V design has 2 reference clock inputs. I want to be able to manually switch between them during runtime. I know that the ALTERA_PLL megafunction can be configured to receive 2 input clocks. I understand that it also provides a manual switchover signal to select between the 2. I also know that (...)
switch the clock source to the x-tal oscillator, and not the internal RC-oscillator. It's in the quoted text!
i have an automatic pet feeder prototype that i?m trying to develop where I?d like to use an off the shelf digital alarm clock to act as the timer to start the power flow to a DC motor? in my ME mind, the chip that is given the instruction to make alarm speaker beep should be able to somehow be modified to initiate power to the motor. is this
If I understand, its can be a power thing. with a clock constantly switching, you're always using power. with a latch the big power draw is only on the switch, so the power draw is less. Also, they can be used in situations where you have no clock.
I want a switch timer, that will switch on for 0min to 1hour and off for 0min to 1hour. i recently found and bought it, but the programming part is what i couldn't understand. i have already bought it but i can't program it, so i'm looking for any other same switch wit easy programming. thanks
The clock is simply a momentary switch to the vcc. There is a pull-down resistor from clock to GND, right? Otherwise, the clock input could pick up 50 (or 60) Hz from mains and the output would switch at 1/8 times that frequency except when the button is pressed, leaving the output at a stable level since (...)
...a simple RC could be added between the switch and the clock pin.....adding a small diode (as 1N4148) to reset (discharge) the capacitor In fact, this could avoid the need to use an integrated circuit to perform this task. However, coupling impedance of this network to D_FF may be properly dimensioned, in case to be
thanks, kennambo. in theory this is well understood, in switched-cap we also simulated with clock, no problems. I just first time to do transient simulation check with a constant voltage. yes, it is like a diode connected, it always at saturation region since the gate and drain are connected to VDD, the effective (...)
Maybe count value is exceeding value 4 and then switch is not executing. Put a debounce delay for if(PORTGbits.RG14) if it is a switch. Also replace if(PORTGbits.RG0 && clockTime.Hours<24) with if((PORTGbits.RG0) && (clockTime.Hours<24))
You can parallelize and/or serialize switches with different clock timings, s. e.g. this example with several phase shifted clocks:
can i switch on vdd i.e connect vdd in sampling and disconnect in the rest clock No. Better use logical enable/disable signals to prohibit all bias currents and short circuit all bias voltages.
The hi-tech universal toolsuite is compatible. Yes, the interrupt routine should give you around 78 kHz frequency with 20MHz crystal (1:256 prescaler value). You'll have to delay each clock in software to get the 38kHz freqeuncy you need. The switch transistor is easy to connect. Check the schematic I attached to this post. D1 is the IR (...)
Hi dear friends, about "glitch free clock multiplexing" I read a lot of topics already. But one problem is still concerning me. I have to switch from one to the another one asynchronous clock as positive edge source of the shift register. All problem is drawn in attachment. Signal 'select' is synchronized with clk1. It (...)
The gate is to avoid propagation of combinational signal through the combinational logic. The gating could be on clock signal or on data signal. The power gating is to switch off/on some part of the logic, which include combinational or flops elements. To restart there is to possibility, first using flop with two power consumption to (...)
hi all, i have designed T.G switch with another dummy T.G for sampling switch , my clock is 20Mhz , i used it for sar adc 8-bit , so how can i measure snr and thd for this switch , how can i choose fin , Nrecord , Nwindow ?? please i am in deep need for answer :) thx in advance :)
I am using DS 1307 clock to display the time on an LCD. Also the PIC counts the number of hours and store it in an EEPROM. The problem is that I need to get the last count even I switch off and ON the PIC on the LCD. How can I manage the addresses of EEPROM so that I can store the count in different locations?
I have inserted integrated clock gate cells in my design in DC and during clock tree synthesis, Encounter inserts the CLK buffers before the clock gate. This causes the buffer to run, when there is no clock required. ANyone know how to move the clock buffers after the clock gate cells, so (...)
i have a circuit where i should give a clock pulse of 50Khz to a switch can i use 8051uc??
What sensor are you using? #include<16F877A.h> #fuses HS, NOPUT, NOLVP #use delay(clock=20Hz) void main() { while(true) { //-------------------------------for motor operation if(!input(PIN_D0))//---------microswitch { //-------------------------------switch for reversing (...)
This design allows you to vary the output level (using R5) and allows you to switch between square wave or sine output. You can easily design the 30kHz clock source with a 555 timer.
Something like timer, to switch in some specified time on and off? Why with Arduino? I want to say what is reason to spend Arduino on this job? See this project: Motion Sensitive LCD Real-Time clock/Alarm/Timer
Suppose I have a PCB with a dozen devices that support JTAG scanning/programming. I want to avoid chaining all the devices in a typical serial JTAG chain because I'm afraid of possible conflicts between them. The trivial (but rather inelegant) solution will a dozen JTAG connectors - one connector for each JTAG capable device. But I was thinkin
Hello everyone, I am trying to design a circuit and using a NMOS transistor as a clocked switch. The gate of the NMOS is connected to a periodic clock signal going from 0 to Vdd. This will make the drain current change periodically with the gate-to-source voltage (Vgs) and may affect other components in the circuit (...)
It depends on how you want to implement your volume control. Often, people use a potentiometer with a knob attached—this gives a smooth continuous volume adjustment. In fact, most radio+alarm clock combos have a "volume on/off switch," which combine a power switch with a potentiometer. If you're (...)
Dhaka, assembly language is not suitable for develop serious projects like digital clock, I strongly recommend to switch on "C", probably MicroC from mikroe.com, you have working example with total explanation... best regards
Hello, Is there a conditiong for the duty cycle of the sampling frequency. I know that the sampling frequency should be twice or more the signal frequency but what about the duty cycle. Does it have to be 50%? when I make it 50% I have good linearity with the sampling NMOS switch but when I make it 15% I have really bad linearity with high (...)
hello friends I have designed the folded cascode opamp...(fully-differential)....i have added SC-CMFB circuit to Amplifier ....but i am getting problem in simulating with PSS and PAC analysis.. my detailed steps for the analysis are as follows... set pss simulation for clock of 2.56MHz and input signal of 256K
since i cannot use the bootstrap switch every where as it occupies larger area ...i am trying to implement a transmission gate switch ..but as the input signal level varies the switch is unable to mantain its specified voltage.... How to solve this problem... i even tried with nmos and pmos of higher widths...
I assume you dont have microcontroller on your borad. you need a simple toggle circuit which can generate a 0V or 5V based in pressed switch. Then you need a clock cicuit to generate a low frequency pulse to make LED blink. Now to select between blink and constant ON you can use a SPDT switch with inputs to be (5V & (...)
Any J-K flip flop can perform this function. Just connect both the J and K inputs to a logic "1". Each pulse on the clock input (output of the switch) will toggle the flip flop. However, you will have a problem with switch bounce. switch bounce is a phenomenon where the contacts close and open multiple (...)
I'm at the final phase of the tape out. and I have some concerns with my DAC I have a current-steering DAC with 500MHz clock rate. It is a 10-bit DAC with 2mA current. Cosidering output resistance of 50ohm, the LSB size is around 100uV. Here's the problem, I connected my latch (the block that feeds digital signal to (...)
The "optimal" solution you want is a ripple counter, which has a delay from clock input to output. The delay increases for each counter stage, and there will be problems with setup time if you feed the outputs to other parts of a synchronous design. The solution from the tool is fully synchronous and all outputs will switch at the same time.
Hello, I am basically trying to interface a through-hole IR opto-switch sensor (OMRON EE-SM3) with Atmel 89S51 uC for counting purposes (i.e. I intend it to generate clock pulses when something opaque passes through its slit). I want to connect it to Timer 0 of
are you taking care of switch debouncing?. is it like you have added the switch or the switch is already in the board?. If its already in the board then there is no problem. or else u need to take care of switch debouncing. is it one step increase or many steps? let say if you press the button will it increase every (...)
Hi sbl, You can make a one shot or monostable pulse with the 555. Power supply is 5VDC Pulse needs to be at least 8 clock periods wide. You then need to invert the output with a 2N3904 NPN transistor See "NPN Common Emitter switch here:
can you correct my code... i dont how to use switch with the clock. so that when i on the swicth the clock start j is start counting. plez help me. module counter( output reg keluar, input clk, input switch, ); // reg result = 6'b000000; reg en = 1'b0; reg i = 0; integer j= 0; always @ (...)
Hi I have never done this before although i have lot of experience using GSM modem I think you can use an analog multiplexer (like CD4053) and a slow clock source (1-2 sec) from your controller to switch the multiplexer signal from one SIM to another and stop the clock signal when you detect an incoming call Otherwise you will (...)
I'd suggest a simpler digital transition detector (like an XOR, with clk to one and delayed clk to the other input) to drive a "reset switch", and your RC network tuned to maybe 2-5uS time constant, and a Schmitt buffer after it.
hello friends!, In my application I have to select any 1 of 3 devices at the startup using user input. These 3 devices pin-outs will be connected to FPGA. I have to select only one of user choice. The pins are "clk, din, dout" pins for interface.3 devices are same....Now I have written a code to interface with this device. But my choice is to work
i think you better tell much more information about your design but if u you say the words only "switch", i guess better have a low Ron one
Hello I am new PIC mcu and I am trying to program 16f88 pwm with 10Mhz clock for 50usec (20khz) pulse output. How do I setup the delay & While(1) .... . javascript:emoticon(':cry:') Here is my sample code but still need to PORTA = 0x03; // RA0:RA1 input On/Off switch PORTB = 0x0E ; // RB3 - output //***** Set U
Hello, I am trying to find a switch component in ADS software, I need to manage this switch with a clock in time domain. I will appreciate any help.
you can simply use a t-gate as switch sampler for a sampling cap. :) however, you have to choose correct sizing for its transistors (to minimize clock feed-through, charge injection, and any harmful effects); a true clock must be defined, preferably a non-overlapping one with real rise/fall times (I suggest you using of (...)
Sadegh.j, Metastability is a condition in a logic device with memory, for example, a flip-flop. The condition arises when the input setup and/or hold times are not met. When the clock is applied, the delay from clock to output is undefined. It may take ordeers of magnitute times the specified dely for the device to (...)
since I'm not fimilar with the board you mentioned, here just a rough summary of the obstacles I had to overcome before the MMC worked. I'm using the FATfs-module which i adapted from PIC24 to PIC18F6722: 1. MMC only accepts clock frequencies up to 400kHz during init. -> after init you can switch to 20MHz 2. output driver of my mmc (...)
hello Iam planning to do a project. Iam ok in electronics but poor in microcontroller programming. Iam planning to an alarm clock. It has 2 alarms per day The circuit is used to switch on and off an electronic device thru this alarm. 1st alarm is to ON and the next is to OFF The alarm settings will change daily and that should be programmed
When I simulate real-time clock crystal's open-loop with ac, there are two cases as attachment: 1)The BLUE result, it uses a ~15meg resisitor as the feedback for setting inverter's operating point. This result is what I needed. 2)The PINK result. it uses several switches in series(a switch is a nmos and a pmos in parallel) (...)
Just use two non overlapping clocks to switch the switches on and off .hence the input signal will get modulated ie multiplied by a square wave n in the output again use a similar pair of switches to turn on and off which is equivalent to the demodulation operation.
Is it possible to add another clock to trigger some switch to do that?
whenever , i switch on the supply lcd showe "INIT MEMORY" then after some time "INIT MEMORY FAIL SYSTEM STOPPED" what should be the problem , i try diff memory cards,etc format it using FAT option etc. i just download the .hex file which is in the zip file , lcd shows clock >> it is ok , but only problem with init memory (...)