Discussion in "Project Help" started by    sakibnaz    Jul 28, 2019.
Sun Jul 28 2019, 12:10 pm
#1
Hi All.

I need to connect my MCU with an external SPI device which have Logic levels of HIGH 3V and LOW 2V. From the Device to MCU Logic shift I can convert the Voltage 3V/2V to 5V/0V respectively using LM339. But I am facing problem in the other direction conversion of 5V/0V to 3V/2V.

Can anyone advice any comparative Circuit or IC which I can use to make the LOW Output a Positive Voltage (i.e. 2V)? It will be great if there any Quad Differential Comparator available.

Thank you in advance.

Regards.


[ Edited Mon Jul 29 2019, 04:02 am ]
Mon Jul 29 2019, 02:25 am
#2
An LM339 may not be fast enough for reliable SPI operation.
Logic shifting is often done with FET transistors.
Search ebay for "Logic Level Converter" for ready made packages.





[ Edited Mon Jul 29 2019, 02:28 am ]

Get Social

Information

Powered by e107 Forum System

Downloads

Comments

sssrsait
Sun Feb 05 2023, 04:57 am
Richardfap
Sat Feb 04 2023, 01:56 pm
klining_Lob
Sat Feb 04 2023, 11:52 am
Stevenplaix
Sat Feb 04 2023, 02:28 am
ufa16zbnow
Sat Feb 04 2023, 02:14 am
NelsonHeard
Fri Feb 03 2023, 07:52 pm
dracermen
Thu Feb 02 2023, 10:32 pm
RowenaSteve
Thu Feb 02 2023, 12:58 am