VH output from ATMEGA128 ?

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bianchi77
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Posted by bianchi77: Sat. Jan 9, 2016 - 02:35 AM
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Guys,

 

I'm using Atmega128 with VH 5V, will it send the right SPI signal to VS1053 with VH 3.3V ?

or VS1053 will read the wrong voltage level even I send the right bytes ?

 

Thanks

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AVR Microcontrollers, megaAVR and tinyAVR
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Bronze Markjs
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Posted by js: Sat. Jan 9, 2016 - 03:49 AM
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You MUST have level translators for reliable operation...otherwise anything will do..or get damaged or..

John Samperi

Ampertronics Pty. Ltd.

https://www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

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bianchi77
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Posted by bianchi77: Sat. Jan 9, 2016 - 04:21 AM
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some kind 5V to 3.3V buffer ? 74LV245 ? any suggesstions ? or just a voltage divider with resistor will do ? or with 10K and zener diode 3V3 ?

 

Last Edited: Sat. Jan 9, 2016 - 04:22 AM
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bianchi77
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Posted by bianchi77: Sat. Jan 9, 2016 - 04:48 AM
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I reckon this one will do ..

http://www.mouser.com/ds/2/149/74LVX3245-106577.pdf

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