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15 Threads found on Logic Level Conversion
I doubt 8051 alone could communicate directly with USB so you will need some kind of adapter to handle the hard work. You need to convert TTL (from/to the 8051) to USB using something like CP2102 or FT232 but be careful of the level conversion from 5V TTL to the 3.3V logic levels some bridge devices need. DO NOT use RS232 (...)
Use several good Toshiba or Cree 1W or 3W LED and heatsink then drive with Thermistor to regulate logic level <=50mOhm Nch MOSFET with drain to cathode LED and epoxy thermistor to heatsink for 50'C to adjust 1V gate voltage from 3.7V LiPo. If you dont know how to design an LED heatsink, buy one with heatsink and reflector. LED should be 2.85V @
The circuit doesn't work. ZXGD3003E6 is just a pair of BJT transistors without level conversion. It's unlikely that you get sufficient gate drive level with FPGA logic level input (3.3V node?) for the low side transistors, and it completely fails to drive the highside transistors.
You can use one of many available voltage regulator ICs. Try Mouse or Jameco or Digi-key for model numbers. Zeners can be used but they are worse regulators than such ICs. On the other hand, logic 5V and 3.3 V levels offer a window within which the systems work, so no tight regulation is often necessary. Where your DC source generates lower than
G--connect to 3.3V S---connect to logic level of 3.3V signal. D---connect to pullup resistor to 5V and the logic level of 5V signal G is always on. therefore D signal passed to S. but who does 5V signal become 3.3V. I don't' see it.
74HCT logic is well suited for 3.3V to 5V level conversion.
Is there a different circuit that could do the job better/cheaper? A digital logic gate with TTL to CMOS level conversion capability, e.g. 74HCTxx, or a comparator.
You should be able to do that with a window comparator driving logic-level type power P-MOSFETs.
Hello, Sorry for the newb question. I am working on a fun little project that requires a greater current than an FTDI cable and USB port can provide. Therefore I need to use an external power supply. I can't just use a 3.3v FTDI cable because in some instances I will need to connect the project to an arduino like board that only outputs 5v.
you are going to need a better datasheet for the RF module. The datasheet you posted contains no information on how to communicate with the module via SPI. The mcu you are using does have an SPI module built in, however the mcu runs at 5V and the RF module runs at 3V. You age going to need a logic level conversion circuit. [url=www.sparkfu
You apparently missed the SY10/100E136 specification of logic level as ECL or PECL on the fast logic product page on Micrel web site. Both are well defined industry standards. PECL means, that the chip can be operated with positive supply as well. level conversion may be necessary, depending on the (...)
74HCT family logic gates (with 5V supply) are a simple solution for 3.3V to 5V level conversion. Hopefully some types are available at your site.
Depends on VIN and required output high and low signalling levels. Assuming 3.3V logic input and a 5V open drain/pull-up, a non-inverting level-conversion seems necessary. In this case you can - replace the first MN by a pull-down resistor - use an open drain or tri-state output "single gate" logic IC (...)
Best method for 3.3 to 5 volt logic level shifter ?
Hi, I have TTL logic output level +5v and 0v I want to convert it to +5v and -5v. How to ? KSA