STM32L412 : Could we used the SPI interface control the 5V LED Driver IC.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
2021-09-07 01:59 AM
Could we used the SPI interface control the 5V LED Driver IC?
- STM32L412's VCC is 3.3V, SPI's pins are FT_f type.
- LED Driver IC's VCC is 5V.
Is there anything that needs extra attention?
Will there be problems with SPI operation?
Solved! Go to Solution.
- Labels:
-
STM32L4 Series
Accepted Solutions
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
2021-09-07 02:56 AM
It should work, provided pins are correctly configured.
You need to ensure +5V is never applied when the chip is not powered (VDD=0).
What LED driver? Make sure that 3.3V is guaranteed to be logic high.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
2021-09-07 02:56 AM
It should work, provided pins are correctly configured.
You need to ensure +5V is never applied when the chip is not powered (VDD=0).
What LED driver? Make sure that 3.3V is guaranteed to be logic high.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
2021-09-07 05:57 PM
Hi TDK,
Thanks a lot.
The LED Driver is IS31FL3743B.
The Vih min is 2.4V.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
2021-09-07 06:26 PM
Hi TDK,
About this question, does ST have any document for SPI operation @ 5V?
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
2021-09-07 06:44 PM
I don't think you'll find anything that specific. What are you looking to find out? The reference manual is typically the best source of information, followed by the datasheet for chip-specific things.
The SPI would be operating at the STM32's voltage, which is (typically) 3.3V. Only the MISO line would be 5V.