2.8

Ranging sequence

Figure 8. Ranging sequence

Note:

API in the figure above means application programmable interface.

Note:

ttiming_budget is a parameter set by the user, using a dedicated driver function.

2.9

Handshake management

Once a ranging measurement is available, an interrupt is generated. This is communicated to the host as a

physical signal on the GPIO1 pin, which is driven low, and the output of a driver function. The former operating

method is called “hardware interrupt”, and the latter is referred to as “polling mode”.

Once the host reads the result, the interrupt is cleared by the driver and the ranging sequence can continue. If the

interrupt is not cleared, the ranging operation inside the device is on hold. The interrupt behavior allows a good

synchronization between the device and the host, which avoids losing results if the host is not available to acquire

or process the data.

It is strongly recommended to use the hardware interrupt pin to manage this handshake.

For more details refer to VL53L4CD Ultra Lite Driver user manual.

VL53L4CD

Ranging sequence

DS13812 - Rev 5

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