impacts of IIC error injection with IIS2DLPC

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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.

Accelerometers

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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.

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B

BBBBBBAuthor

Associate

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

Super User

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

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.