Figure 5. Multiple sensors on SPI
To allow a device to have its I2C address changed without affecting others on the I2C bus, it is important to
disable the I2C communication of the devices not being changed. The procedure is as follows:
1. Power up the system as normal.
2. Pull down the LPn pin of the device that will not have its address changed.
3. Pull up the LPn pin of the device that has the I2C address changed.
4. Program the I2C address to the device using function set_i2c_address() function.
5. Pull up the LPn pin of the device not being reprogrammed.
All devices should now be available on the I2C bus. Repeat the above steps for all the devices in the system that
require a new I2C address.
UM3109
Schematics and I2C/SPI configuration
UM3109 - Rev 1
page 5/20
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