M24C04 CRC error at 400KHz

Dear Team,

We are using M24C04-D in our design and getting CRC error at 400KHz.

We observed that almost every time only 1bit change i.e SDA not able to rise to 1. Please see below image.

There is no such issue at 100KHz. Could you please tell what could be the potential root cause of such issue & how it can be resolved.

regards

Vinod Sharma

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Super User

Hi,

what are the pullup values on I2C ?

Visitor II

Hi,

Pull resistor value is 1K to 1.8V. We are applying 1.8V at VCC.

Also please see more detail about this issue:

1.We are reading 104Byte starting from 17th Page in sequential mode. We are reading other data also but not this much in sequential mode.

2. This error comes only from 21th Page every time while reading 104Byte.

3. If nth bit of byte get corrupted then this will follow for the same for complete data. Mean only one particular bit is corrupted every time.

4. 100nF is connected to VCC

regards

Vinod Sharma

Super User

Strange - just which M24C04 ?

M24C04-DRDW3TP/K ?

Graduate

IIC has been a problem on STM32s, but the fix is easy.. Set the Pin Speed to Very Fast on SDA and SCL

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