3.3-5v conversion

3.3-5v( Reprint )

 

When you use 3.3V When we use the single chip microcomputer , Level conversion is inevitable , Come across 3.3 turn 5V perhaps 5V turn 3.3V The situation of , Here's a simple circuit , He can realize the mutual conversion of two levels

( Attention is mutual , Bidirectional , Not one-way !). The circuit is very simple , Only by 3 One resistor plus one MOS Tube composition , The circuit diagram is as follows :

Above picture ,S1,S2 Two signal terminals ,VCC_S1 and VCC_S2 High level voltage for these two signals . In addition, the restrictions are :
1,VCC_S1<=VCC_S2.
2,S1 The low level threshold of is greater than 0.7V about ( Depending on the NMOS Depending on the diode voltage drop in the ).
3,Vgs<=VCC_S1.
4,Vds<=VCC_S2
    about 3.3V and 5V/12V And so on ,NMOS Tube selection AP2306 that will do . The principle is simple , Let's make our own analysis ! This circuit has been applied in many places , The effect is very good .