Hello sourav,
As you separate the sensor from mcu board and make the communication using I2C via wire, the connection should be as short as possible.
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Hello canpinaremre,
It seemed this question was described in https://community.bosch-sensortec.com/t5/MEMS-sensors-forum/BNO055-Jumps-Spikes-in-readings/m-p/21268#M6135
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Hello ,
Generally we recommend to use a tape during soldering in order to protect from contamination. If factory have qualified their reflow process to be free of contmination and thus did not need the protection.
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