impacts of IIC error injection with IIS2DLPC

[BBBBBB]

For special test case, that directed connected IIC's SCL(LUX_TILT_SCL) to GND and kept for 5mins, will this action hurt or damage IIS2DLPC?

IIC worked with 100kbps.

Work with IIC.

 

We found that after this action/error injection:

Sometimes, the sensor cannot response with IIC ACK/no response from sensor.

Sometimes, the sensor responses with incorrect axis data.

 

[TDK]

Grounding SDA or SCL will not hurt the chips, but it will prevent communication from taking place. SDA/SCL are driven with open drain, so pulling them down doesn't cause hardware issues.

Use a logic analyzer to see what's happening on the line.

[BBBBBB]

With logic analyzer, after 5mins ground SCL, the chip randomly cannot response with IIC even remove SCL grounding.

No response could not recover even cold reboot the chip.

 

 

[Andrew Neil]

On recovering from I2C errors:

https://community.st.com/t5/stm32-mcus-products/stm32h745i-i2c-recovery-after-addressing-nonexistent-device/m-p/660263/highlight/true#M240602

[BBBBBB]

I wound like to confirm whether these 5min SCL grounding cause IIC slave(sensor) stuck?

I2C-bus specification and user manual

[BBBBBB]

For another abnormal behavior after 5mins grounding SLC, the axis data was incorrect, confirmed with logic analyzer.

When sensor was steady state on a horizontal surface, X-axis reached 1000mg. X-axis should be around 0mg.

[Billy OWEN]

Hi @BBBBBB 

 

This post has been escalated to the ST Online Support Team for additional assistance.  We'll contact you directly.

 

Regards,

Billy