DocID026571 Rev 1 19/27
AN4545 Device settings
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Note: {0x1c} is a 8-bit register.
Maximum value for the Max convergence time is 63ms. Minimum value should be set to a
value of 2 or higher for range measurement to be successful.
1 code = 1 ms.
6.1.2 Inter-measurement period
The SYSRANGE__INTERMEASUREMENT_PERIOD {0x1b} register sets the Inter-
measurement period between each measurement when in continuous mode. The inter-
measurement period needs to be set to a value that is above the maximum allowable full
ranging cycle period. The following equations define the minimum inter-measurement
period to ensure correct operation:
Inter-measurement period*0.9 > Full ranging cycle = Max convergence time + 5ms.
Note: {0x1b} is a 8-bit register.
A value of 0x00 for {0x1b} equals to a inter-measurement period 10ms. Each code will add
10ms to the inter-measurement period. e.g. inter-measurement period 50ms = 0x04.
6.1.3 Readout averaging period
The READOUT__AVERAGING_SAMPLE_PERIOD {0x10a} register sets the internal
readout averaging sample period. Increasing the sampling period decreases noise but
increases max convergence time and power consumption. Each code corresponds to
around 64.5µs additional processing time and there is a fixed 1.3ms of overhead during
readout.
Sampling period = 1.3ms + 64.5µs * READOUT__AVERAGING_SAMPLE_PERIOD
By default {0x10a} is set to 0x30 which will give a sampling period of 4.4ms.
6.2 Additional error checks
VL6180X has three additional system error checks which can be enabled to help filter out
invalid range results. See the VL6180X data sheet on how to set these error checks as well
as enabling and disabling them.
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