S32KのトピックRe: S32K144 interface voltage for ISELED

S32K144 interface voltage for ISELED

nanjun — Thu, 10 Feb 2022 14:37:54 GMT

Hello,

the S32K144 is connected to iseledstrip through an adapter board.

The voltage from MCU is 3.3V while LED strip requires 5V. Could the MCU be damaged during read function?

See ISELED ADK User Manual.

Kind regards,

Neo

Re: S32K144 interface voltage for ISELED

lukaszadrapa — Fri, 11 Feb 2022 10:05:32 GMT

Hi,

when the supply voltage is 3.3V, the MCU is not 5V tolerant even if a pin is configured as open drain. The datasheet explicitly states that open drain pin must be pulled to VDD. And Vih spec says that input voltage can't exceed VDD+0.3V. If an external circuit requires 5V, the only options are either to use 5V supply voltage for MCU or use some voltage level translator.

Regards,

Lukas

Re: S32K144 interface voltage for ISELED

nanjun — Sun, 20 Feb 2022 18:42:39 GMT

Hello Lucas,

thanks for your reply. Actualley I wrote you back some days before but it seems the email failed.

The problem was solved.

Kind regards,

Neo