All Questions
Tagged with logic-level uart
18
questions
2
votes
1
answer
220
views
Using an open drain buffer as a logic level step down converter
I'm trying to convert a 3V3 UART to 1V8 UART with an open drain buffer, but the output of the buffer is always high.
See the schematic below for the circuit. On the input to the buffer, there is a 0V -...
3
votes
4
answers
2k
views
Unidirectional level shifter 1.8-5V -> 3.3V
I'm looking for a circuit/IC to shift logic levels between 1.8/3.3/5V and 3.3V.
This is to connect various devices via UART to the ESP8266. As such, I only need unidirectional translation - the ...
- 33
0
votes
0
answers
303
views
2.8V UART to 3.3V and 5V MCU automatically
I'm designing a PCB of SIM800C Module. Just to improve myself and it is my first project so I'm a noob sorry..
I want GSM module to communicate(from RX,TX pins) with STM32, Raspberry, Arduino. But the ...
0
votes
1
answer
173
views
Data Logic Levels Sent From Sensor Are Not Going All The Way Low
I'm having issues receiving data from a 3.3 volt logic level R503 Fingerprint Module that is sent via it's Tx pin using UART. The logic levels are converted to 5 volts using a bi-directional converter....
- 228
-1
votes
1
answer
404
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Would this circuit interface be a safe interface between full duplex and half-duplex UARTs of different logic levels? [duplicate]
I'm primarily a SW developer who dabbles with electronics. I needs to interface my SoC's HW full-duplex UART with an SDI-12 compliant sensor, without burning either of them and hopefully without ...
- 190
1
vote
1
answer
935
views
Connect to LIN bus with logic level shifter as transceiver
Is it good idea to connect my microcontroller to LIN bus with logic level shifter (5 <=> 12 V) instead of factory LIN transceiver (MCP2003, TJA1020, etc.)?
As I understand, LIN transceiver just ...
- 273
1
vote
3
answers
2k
views
STM32F4 and SIM800L logic level
I am currently using an STM32F401RE that I have to interface with a SIM800L GSM module via UART. In a first "toy example" I used Arduino and found no problems, but passing to the STM MCU I am unable ...
- 31
0
votes
2
answers
139
views
Preventing overvoltage on serial pin
I am trying to send data through serial from a 3.3v Arduino to a 5v Arduino. I assume I can't just connect the 3.3v tx to the 5v rx because, when I program the 5v one I am assuming it will send 5v ...
- 447
1
vote
2
answers
453
views
Component recognition from marking code
I need help to recognize a dead component from a lab instrument control board. It is part of a TTL-serial interface, arguably a logic gate or some level shifter, in a TSSOP-14 package.
You can see ...
- 31
1
vote
1
answer
951
views
Logic level of CP2102
I want to have an USB-UART interface for my Controller. I was thinking to use CP2102 and thus was reading the data sheet. But I cannot figure out the logic level of the UART part of CP2102. Can you ...
- 517
0
votes
2
answers
200
views
FTDI232 and GNS FM9, what voltage
I have a GNS FM9 dongle, which is a RDS receiver that came bundled with a sat-nav, intended to be used as a receiver for TMC traffic reports (which are transmitted as part of the RDS data stream).
...
- 176
0
votes
1
answer
552
views
Max rx input voltage on FT232rl
The data sheet states:
"Integrated 3.3V level converter" on the UART and CBUS pins. (https://cdn.sparkfun.com/datasheets/BreakoutBoards/DS_FT232R.pdf).
I just want to confirm that means it's rx pin ...
0
votes
1
answer
172
views
Measuring if a transistor can work for SPI/UART when doing logic level conversion
I need to convert 3v3 to 5V and 5V to 3v3 for SPI/UART. I found many options. But I'm still confuse whats good for me. Because Transistors and few other components has rise and fall time. I want to ...
- 517
0
votes
2
answers
1k
views
Logic low not low enough
I'm having an issue where the "low" level being output from one device isn't low enough for the device on the other end to interpret it as such. I'm guessing I'm not the first person to have this ...
- 151
2
votes
1
answer
2k
views
Arduino <-> BBB UART issues using bi-directional level converter (5v to 3.3v)
I am having a strange issue interfacing between an Arduino and BeagleBoneBlack over UART.
The Arduino is 5v logic, and the BBB is 3.3v logic, so I'm using a bi-directional logic level converter from ...
- 139