Could you kindly share any reference schematics for SPI EEPROM M95P32-I interfacing with STM32 MCU?

[SR NA.2]

Could you kindly share any reference schematics for SPI EEPROM M95P32-I interfacing with STM32 MCU preferably STM32U585?

[TLLAM.1]

Hi,

Thanks for contacting our ST community support.

Which SPI modes do you want to interface with the M95P32-I ?

Single, dual or Quad SPI ?

For your information, the M95P32 Dual and Quad SPI are output only (only for reading operations)

Thanks,

Best regards,

Thomas

[SR NA.2]

Hi Thomas,

Hope you are doing great.

In our project we will be using Single/Dual SPI and not Quad SPI.

Could you please provide reference schematics on Single/ Dual SPI of M95P32-I interfacing with STM32U585ZIT6?

Best Regards,

Sreejith

[TLLAM.1 · Accepted solution]

Hi Sreejith,

The STM32U5 has 2 types of SPI interface :

• Single SPI
• OctoSPI

The Single SPI interface can only communicate with the M95P32-I in single SPI

This is why I suggest you to use the OctoSPI interface as it can manage single, dual, quad or Octo SPI.

In that way, you will have the flexibility to communicate with the M95P32-I in single, dual or quad SPI.

Please find attached an example of how the STM32U5 communicates with the M95P32-I

Best Regards,

Thomas

[SR NA.2]

Hi Thomas,

Thank you for the response.

As of now we are going with single SPI. But we will consider the recommendation of choosing Quad SPI and shall revert back if I have further queries.

Thank you once again for your tremendous support.

Best Regards,

Sreejith R Nair

Professional-I

Capgemini Engineering

[SR NA.2]

Hi Thomas,

Greetings.

Could you kindly clarify on the following point:

If we are going with single SPI interface, whether we need to use pull-up resistors for HOLD (Pin#7) and W (Write Protect, Pin#3) pins as it is mentioned in the datasheet of M95P32-I (Section 4.1) that these signals, the write protect (W) and hold (HOLD) signals must be driven high or low as appropriate. If so, please mention the pull-up resistor values.

Regards,

Sreejith

Professional I

Capgemini Engineering

[TLLAM.1]

Hi Sreejith,

You can use these resistor values :

Write protect : 4.7K

HOLD : 100K

Best Regards,

Thomas