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i2cdetect -y -r 0 only shows a 0x70 address. But it show has one more 0x6f address:

root:/sys/bus/i2c/devices/i2c-0# ls
0-006f  0-0070  delete_device  device  i2c-dev  name  new_device  subsystem  ueven

where goes wrong?

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    \$\begingroup\$ How would anyone else know? You've provided no information about the host or device. Put a scope or inexpensive USB-based logic analyzer on the I2C lines. \$\endgroup\$ – Chris Stratton Sep 23 at 2:25

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