Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

i2c 3v to 5v level converter

Status
Not open for further replies.
fireplus

fireplus

Full Member level 3
Joined
Oct 31, 2003
Messages
182
Helped
7
Reputation
14
Reaction score
3
Trophy points
1,298
Activity points
1,633
i2c level converter

Hi,
I want to interface the isd 5116 chip coder from winbond with at89c52 (8052 from atmel)
My problem is that at89c52 is 5v mc and isd5116 is a 3.3v so
1.I need a simple circuit to regulate my 5v power supply to 3~3.3v to power the isd5116
2.isd use i2c to comm with hosts (i.e mc) I want to know if I can connect i/o of the 5v mc directly to SDA and SCL or what?
Some general c/c of the isd5116:
VIL : Vcc *0.2
VIH : Vcc*0.8
VOL: SCL, SDA Output Low 0.4V
VOH : Vcc - 0.4v
If any body can help please :cry:


Fire in the Wire :sm2:
 

3v to 5v converter

Hi,

I think that i2c driver are open drain or open colector, so you connect 2 pull-up resistors at 5V. Check datasheet of your circuit to see if I'm right.

Cheers !
 

3.3v 5v level converter

hi fireplus,
i asume that u want to dio I2C by bit banging. so check out if the slave pins are 5 v resistant, if they are then u have no problem, but if they are not then ,
Pull up the SDA and SCL to the vcc of the slave(3-3.3 v) and when u want to switch high, then configute the port pin(s) as i/p, this way u are giving a 3.3 v to the slave ( with the pin as a high impedance so it'll not load the bus) and when u want to go low, put the pin in o/p mode and pull it low.

Follow the same and u'll have it!!

cheers :)
sam
 

3v to 5v level converter

THE I 2C-BUS SPECIFICATION VERSION 2.1 january 2000
h**p://www.semiconductors.philips.com/acrobat/literature/9398/39340011.pdf
Fig.45
works very well.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top