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Electronics => Electronics => Topic started by: unicoder on May 09, 2009, 01:29:38 PM

Title: Do I have this right?
Post by: unicoder on May 09, 2009, 01:29:38 PM

Ok so hodge podging something Like the Max232 IC together.

Datasheet for CD4049UBE (http://www.datasheetcatalog.org/datasheet2/5/0q6yx33raq0a72uo4y8hedzschwy.pdf)
Given:

RS232E H = -3v/-12v L = +3v/+12v

TTL H = +2v/+5v L = 0v/+0.8v

CD4049UBE Pin 1 -> +5v
CD4049UBE Pin 8 -> +0v

Sends -V to CD4049UBE when RS232 Low is on DB9 Pin 3
DB9-Pin 3 -> PNP(Q1) Base
PNP(Q1) Emitter -> CD4049UBE Pin 3
PNP(Q1) Collector -> 0v

For AVR's
CD4049UBE Pin 2 -> MCU Pin 2(PD0)
MCU Pin 3(PD1) -> CD4049UBE Pin 4
CD4049UBE Pin 5 -> DB9 Pin 2

For 8051's
CD4049UBE Pin 2 -> MCU Pin 3.0
MCU Pin 3.1 -> CD4049UBE Pin 4
CD4049UBE Pin 5 -> DB9 Pin 2