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Hi everyone
Could I pull the open drain output pin (p0.2) to 12V through a 4.7K R to get a 0V or 12V DC to control a PMOS?
The datasheet said that the IO can tolerant 5 V,but it seems that the open drain output pin can work as well by pulling to 12V through a 4.7K.
Thankyou...
I want to design a device with a MCU ,Keyboard and LCD.As the Keyboard is used by hand pushing, the ESD problem is to be thought. As we know the electrostatic may be 10KV of human body,but the optocoupler usually provide a 2KV isolation.
Is there a good idea for this problem?
Thank...
The pic is about the FPGA of Xinlix ,I can not understand why the output high current is negtive,low is positive.(Values for VOL and VOH are guaranteed output voltages over the recommended operating conditions.)
Can anybody help me?
uln2803+led
Thankyou for your reply.May be connect the anode to the Vcc & the cathode to the Port pin using a resistor is OK,as I only want to turn on 4 LEDs.
But I think with ULN 2803 between MCU and LEDs is helpfull for EMC.You see,the Leds will fixed outside the enclosures and other...
“Balanced amplifiers may be an alternative to transformers if common mode interfering voltages can be assured to keep a certain limit, as it's the case with most audio systems, e. g. stage PA.”
Thankyou for your reply,but I have read the APPLICATION NOTE "Understanding Common-Mode...
In type design,there is a transformer for audio signal coupling.But I do not know how to calculate the characteristic impedance of the transformer.
So I want to use 2 caps to replace the transformer.But I do not know this idea is good or bad.
uln2803 led
In my design,I try to use AT89S52+uln2803 for Led driver.Could I connect port 1(or 2,3) to 2803 without any pull-up resistors?
Someone said port1(or 2,3) can not output 1mA current.But I can not find the parameters on the datasheet.
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