DocID026250 Rev 1

5/9

AN4478

Multiple VL6180X operation steps and schematic suggestions

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Figure 3. I2C GPIO extender application

4.

The process to initialize each VL6180X is shown below

a)

Take VL6180X number 1 out of reset by either direct a direct GPIO from the

microprocessor or by giving an I2C command to U1 to bring GPIO0_1 high.

b)

Write to the VL6180X just taken out of reset to the address 0x0212 with the value

of the new I2C device address. The default value is 0x52, so for this example, the

address of the first device will be changed to 0x80 (0x82 for device 2, 0x84 for

device 3, …)

c)

To ensure it is working correctly, it is suggested that you now do a read of the

device ID of the VL6180X with its new I2C device address written in step 3.b.

d)

If the device is now communicating on its new I2C device address, then repeat the

steps 4.a to 4.c for each additional VL6180X attached to the device. In this case

shown in step 3, GPIO0_x will each be brought high one at a time until all 8

devices are initialized.