Interfacing 5v (Rd/Tx) to 3.3v (Tx/Rx)

Hello,

I'm using an Arduino (5v) and the device is a Skytraq-Venus634FLPx GPS module that is 3.3v LVTTL UART https://www.electro-tech-online.com/custompdfs/2009/05/Skytraq-Venus634FLPx_DS_v051.pdf

I've heard about Bipolar transistors that can do the job. I don't know more and can't go any further as my skills reach the limit at this point.

Anyone ?

Thanks!

Have a read of Microchips hints and tips.

Mike.

Hi,
So many level translators are available in the market and also it's very cheap.And for your reference some of the level translator part~ for 5V to 3.3V and vice versa
Voltage Level Translation - Dual Supply Translators - SN74LVC2T45 - TI.com
This device will solve your problem.Any further clarifications please mail me on aarupk@gmail.com

I have had the 74HCT125 recommended to me. Works great in my SD Project.

The 74HCT125 is awesome for SD since its a QUAD piece. You might find it more usefull using that part. The SN74LVC2T45 is a OCTAL part which may be a overkill.

I think its ok if you connect the 3.3v output to a 5v input aka 3.3v Tx pin to micro but for the input pin use that IC. You could use the IC for both if you wish.

I never tried this but maybe you can convert the 3.3v logic to a 5v logic:
I assume you need to setup like

1A = 3.3v
1Y = 3.3v Rx Pin on GPS module
1OE = TX on PIC

2A = 5v
2Y = Rx on PIC
2OE = 3.3v TX Pin on GPS module

If im wrong please correct me.

Be aware that this IC : "outputs enable inputs (OE = active LOW)"

A "74AHC126" would be the best for this i think

I will not recommed the HCT,HC series buffer.And 74HCT125 is not a level translator.Use level translator only.Level translator only solves your problem

@Arumugam, i let you know if i suceed. Thanks for all the help gals and guys!

If you can find them in your area the Texas chips TXB0104 - 4 bit and TXB0108 - 8 bit, are much simpler to use - although only available in smd.

They are true 4 / 8 bit dual voltage bidirectional voltage level translators with auto direction sensing.

see - https://www.electro-tech-online.com/custompdfs/2009/05/txb0104.pdf