Multiple VL6180X operation steps and schematic suggestions

AN4478

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DocID026250 Rev 1

5.

After all of the VL6180X devices are initialized, the microprocessor can talk to each

device individually and can configure them for operation. The configuration will include

setting the convergence time, interrupts, inter-measurement time, Threshholds for the

interrupts, etc.

6.

To configure the Interrupts, the VL6180X device can give interrupts is various ways,

including the following:

a)

Interrupts Disabled

b)

Interrupt when a measurement is completed

c)

Interrupt when a measurement is below a certain threshold of distance (ie.

Distance less than 5cm)

d)

Interrupt when a measurement is above a a certain threshold of distance (ie.

Distance greater than 10cm)

e)

Interrupt when a distance measured is out of a certain window (ie. Distance less

than a Low Threshold or the Distance is greater than a High Threshold)

7.

With the example of using the I2C GPIO Expander for the Interrupts, each VL6180X

could be configured to give an interrupt when a distance is less than 5cm and to run in

continuous measurement mode. If any device is showing a distance of less than 5cm,

then an interrupt will go off for that device, which sets off the interrupt either directly to

the microprocessor or from the U2 GPIO Expander. If the GPIO Expander is being

used, the microprocessor would then poll U2 to see which VL6180X is triggering the

interrupt. Next, the microprocessor would communicate directly to the VL6180X with

the interrupt that is showing a distance less than 5cm. When the microprocessor has

the information needed, it would then clear the interrupts on the VL6180X and the I2C

GPIO expander U2 (if used).