When the data sheet says that a Logic High Input Current is 10 micro amps(max), as the limit, does this refer to the maximum amount of current allowed on that pin, or does it represent the maximum amount of current that pin can draw is 10micro amps?
Yes, Although the PWM signal is not directly used to control a motor, it is however used on the LMD18201 as a duty cycle PWM signal. I believe the chip reads the PWM signal and generates its own outputs that pulse at a variable frequency, but is dependant on the PWM signal.
I opened up a servo and checked the frequency, the motor does make whining sounds, but only when there is force applied on the arm as the motors are attempting to restore the PWM indicated position. The motors in the Server are pulsed anywhere from 30hz to 400hz...havnt gotten anything higher...
My controller is a pure 0 - 100% PWM controller. I programmed it so that the output is at 127. The RC servo I plugged in responded correctly to the neutral position. At 255, the arm swings fully right, and at 0, the arm swings fully left. I believe this is the type of PWM used in RC...
Ive just tested the PWMs, I have a servo that works with RCs and I've plugged in into the PWM controller that I have with 8 PWM outputs. I've programmed it so each output is differnt but ranges from 0-255, then I powered up the controler and tried the servo on it. It works! I don't know why, but...
I Just remembered something, Will this CHIP work with PWM signals that look like this: 1ms is full reverse, 1.5ms is neutral, 2ms is full forward.
The specification data on page 6 of the data sheet says there are two types of PWM signals that are capable. I don't know if the first type is the...
Awesome =D Thanks so much. I'll just be putting in some caps at the terminals for filtering and a 10k resistor to pull down the outputs in case of any failures.
But then, if small LEDs rated at 10mA requres current regulation, wouldnt the IC need regulation as well? So runing the IC dirctly off the power rail is a bad idea then?
Well, here is the data sheet on the chip im using. Its an H-Bridge controller.
http://www.national.com/ds/LM/LMD18201.pdf
The typical supply current is 13mA, as it is a costly IC, I don't want to risk frying it. But what about LEDs? Those 10mA LEDs needs current regulation when pluged into a...
what is the common way of supplying low currents to an IC or microchip without having to tap into a secondary low supply source. I want to run an IC right from the high amp source, I've looked at Current limiting diodes and wondered if those little diodes could handle high input currents. Whats...
