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51 views

Can I connect two MCUs directly to one micro SD card without additional components?

I am new to this community so I am sorry if I'm asking in a wrong place or something out of topic. I think I have considered everything. :) So, now the basic info: I am working on a project which ...
1
vote
1answer
47 views

Pullup resistor operation between the ESP32 and a Bus MCU

I have an ESP32 as my main controller and a Bus. The bus operates where Pins 55 & 56 needs to be HIGH in order for the bus to be OFF. My ESP will drive the bus by enabling it by pulling those ...
0
votes
2answers
65 views

Microcontroller Wired-OR connection

I would like to connect several microcontrollers as shown in the circuit diagram below. The software makes sure that the PA1 pin always has the low or floating state. It's a kind of open drain ...
0
votes
2answers
68 views

Does direct GPIO communication between 2 microcontrollers requires pull up/down

If I want to use GPIO pins of two microcontrolles as a mean of simple communication (e.g. reporting an event by sending 1 or 0), Do I need to enable internal pull up or pull down resistors on any of ...
0
votes
1answer
47 views

Multiple Open Drain Outputs to one MCU-pin

i want to use two DRV8844 (http://www.ti.com/lit/ds/symlink/drv8844.pdf) Motor Drivers. It has an Open-Drain output, that indicates an error, when it is LOW (nFault). What happens, when i connect ...
-1
votes
1answer
331 views

STM32F303 Microcontroller open drain GPIO, Can it reach / be pulled up to 5 Volts?

I hope you are all doing well... :). I'm working on a project with pulse width modulation however I need my logical high output to be 5V. However, as my Vdd is 3.3V, the output high level is ...
0
votes
1answer
89 views

MOSFET Vgs doesn't go to zero when controlling it with open drain output

I have this simple circuit to drive on and off a 12v rail from a microcontroller. R707 = 10KOhm, R708 = 10KOhm, and Q701 is a P channel mosfet (IRLML6402TRPBF) I'm driving this with a ...
0
votes
2answers
135 views

Open Drain while transmitting data with port direction output

I am new to this information portal! However, I have question regarding open drain. I read that, in open drain mode, neither of the devices (slave/master) are allowed to drive the data line HIGH, ...
0
votes
1answer
63 views

Sanity check on an open drain buffer (pull-up to 3.3V but 14V on gate?)

I want to make a simple open-drain buffer using the 2N7000 MOSFET. The input signal on the gate (Vgs) will be 14V and the voltage it is switching is 3.3V (Vds). Usually MOSFETs are used to switch ...
2
votes
3answers
1k views

Open Collector/Drain vs Push pull

Given the situation where an LED is being used for a status indicator or similar, not toggling quickly. Which is the best configuration for the IO pin, push pull or open drain? As I see it either ...
-1
votes
1answer
782 views

3.3V to 5V PWM level shifting - ARM microcontroller

I am working with an STM32F0 running at 3.3 V. I'm trying to drive a motor controller with PWM from the microcontroller. The motor controller requires an analog input of between 0 - 5 V to control the ...
2
votes
2answers
347 views

Open collector with Atmega48

After looking at this, I think I already know the answer, but I just wanted some clarification. Open collector microcontroller output I have a part that is going to drive my mosfet at 15V. I have ...
3
votes
1answer
6k views

Driving a LED with an open drain digital output

I need to drive an LED from an STM32F217ZG. So I was thinking about a classic circuit with a BJT. But then I saw that GPIO outputs of the microcontroller are configurable as open drain. Would this ...