How do I calculate the required value for a pull-up resistor?
2017年4月15日 · \$\begingroup\$ This situation where you could see excessive capacitive coupling affecting a pull-up resistor value. Seems crazy, but it's not. I have an obnoxious tri …
microcontroller - When to use pull-down vs. pull-up resistors ...
2016年4月6日 · This time a pull up resistor is required to create this behavior. simulate this circuit. There's also the alternative case where you want a device to be default-on, in which case the …
Is there a correct resistance value for I2C pull-up resistors?
2010年3月13日 · The SDA bus requires a pull-up resistor to VCC (typical 10 kΩ for 100 kHz, 2 kΩ for 400 kHz and 1 MHz). I thought that any resistor with a kΩ value would do the job (and it …
Does it matter how big the pull up resistor is for a comparator?
2021年10月20日 · To keep the voltage drop across the pull-up resistor under 100mV, you use at most this resistance: $$ R = \frac{0.1V}{1\mu A} = 100k\Omega $$ The only other thing I can …
What makes a pull-up/down resistor strong or weak?
A strong pull-up/down resistor is good because noise currents from unintended coupling and EMI will result in smaller noise voltages. (Think about Ohm's law) A weak or high resistance pull …
Placement/location of pull-up/pull-down resistor?
2014年11月5日 · If you put the pull-down resistor close to your MCU, and have a long long trace from your MCU to the converter. If your converter's enable pin will source some current, the …
Why is this MOSFET's "pullup" resistor necessary?
The resistor provides a path from the output to Vs. If the resistor value is too small the MOSFET will have hard time pulling the output all the way to ground, but if the resistor is too large then it …
Calculating the pulldown resistance for a given MOSFET's gate
\$\begingroup\$ I'm interested in a full answer to this as well, but my experience with MOSFETs is just to choose the lowest possible resistance value (to reduce the amount of thermal noise …
USB pull-up in STM32F103 (D+) - Electrical Engineering Stack …
2021年12月11日 · In design document from STMicroelectronics called "USB hardware and PCB guidelines using STM32 MCUs" is said, that F103C8T6 series need pull-up resistor on a DP …
Pull up resistors on UART - Electrical Engineering Stack Exchange
2016年11月22日 · A pull-up resistor on the UART serial Receive Data (RXD) input pin is not necessary because the RS232 line receiver is always driving that pin. Note that the reset …