at89s52 interfacing with Xbee

hello, i had promble with communication by using xbee. i know that xbee operate with 3.3V but 89s52 is 5v

1. my project like this :

uc+xbee (send data to) xbee+pc

2. can i using this circuit http://www.8051projects.info/upload/Image/Interface_ckt.BMP

tq

You can use that schematic if your module is support 5v inputs. if not then you have to lower down the voltage level. You can make use of a simple transistor logic.

for input to microcontroller you actually dont need to do anything. microcontroller that are 5V tolerant can accept 3V input levels.

so.. do check your module's datasheet...

[Topic moved to 8051 Discussion forum]

i see the module`s datasheet, the tx current : 45mA @ 3.3V and rx current : 50mA @ 3.3V

it show that i cannot directly connect to pin tx/rx uC and must have a voltage divide to reduce the voltage from 5V to 3.3V ? right? if i wrong plz corret it.

thanks

yes u can use voltage divider or MC14050 it is 3.3 volt operated not gate
insert it in controller and xbee module

thanks majoka for ur reply

are this circuit like this?

http://www.kronosrobotics.com/Projects/MaxStreamInterface3.pdf

yes almost in pdf circuit is doing same thing resistor will limit hr current
i was talking like this that is on this page
http://www.8051projects.net/forum-t40433-last.html

hmm, how about the data? did will be effect at the data tx/rx?

yes may be it effected but module can effect that point is more important

hmm, that any solution to make sure the data and module in the good condition when it interface with 89s52?