Tagged Questions
1
vote
0answers
85 views
Level shifting with BSS138 - weird values
I need to connect 5V and 3.3V devices via I2C as follows:
I've connected 3.3V and 5V pull-ups and try to measure voltage. There is 5V on HV and TX_HV but 4,7V on LV / TX_LV.
Putting TX to LOW ...
3
votes
3answers
4k views
Level Shifting 1.8V to 5V with N-channel FET
I am using BeagleBoard-xM GPIO outputs to drive some DC motors with the help of L293D IC. The problem is that there is a difference between voltage levels. The GPIO outputs only supply 1.8V while ...
0
votes
1answer
383 views
Square Wave Voltage Level Shifting (Take 2)
After my question before, I tried to design a circuit with zener diodes and transistors for this issue.
It seems to work in simulation. Am I overdoing it? Are there any other simpler ways to do this, ...
2
votes
2answers
276 views
Square Wave Voltage Level Shifting
I have a square wave signal of 300 KHz which is 0.2 V to 1 V. It is the output of FP5138 Non-Sync PWM Controller IC. I want to drive a PMOS with this square wave but with the levels shifted to ...
6
votes
1answer
812 views
How is this circuit for level converting (5V<>3.3V) working?
Does anybody know, how is this circuit exactly working? It is level converter between 5V and 3.3V logic and it is bi-directional.
I have some theory, but I am not sure with it (I never worked with ...
9
votes
1answer
3k views
Is my MOSFET-based bidirectional level shifter insane?
In a moment of cheapness, I decided not to order a 5v to 3.3v level shifter from Sparkfun, but instead to put it together myself. The original schematic used a BSS138 MOSFET, but since I enjoy ...
