VL6180 datasheet(26/73 Pages) STMICROELECTRONICS

26 / 73 page

Functional description

VL6180

26/73

DocID024986 Rev 14

Figure 16. Typical ranging current consumption (10 Hz sampling rate)

The minimum average current consumption in Figure 16. is 1.5 mA, 0.5 mA of which comes

from pre-calibration before each measurement and 1.0 mA from post-processing (readout

averaging). Pre-calibration is a fixed overhead but readout averaging can be reduced or

effectively disabled by setting the READOUT__AVERAGING_SAMPLE_PERIOD{0x10A} to

zero (default setting is 48).

Note:

Decreasing the READOUT__AVERAGING_SAMPLE_PERIOD will increase sampling noise. It

is recommended that any change in setting be properly evaluated in the end application.

Minimum current consumption scales with sampling rate i.e. at a sampling rate of 1 Hz the

current consumption associated with pre- and post-processing will be 0.15 mA.

2.14.2

Current consumption calculator

Table 11. gives a breakdown of typical current consumption for pre-calibration, ranging and

readout averaging.

Current consumption can then be calculated as follows:

I (A) = sampling_rate * [Q1 + (Q2 * RESULT__RANGE_RETURN_CONV_TIME in ms) + 

Q3 * (1.3 + (READOUT__AVERAGING_SAMPLE_PERIOD * 0.0645 ms))]

Table 7. gives typical convergence times for different target reflectance.

So, for example, RESULT__RANGE_RETURN_CONV_TIME for a 3% target at 50 mm is 4.35

ms. At 10 Hz sampling rate this gives:

I (A) = 10 * [41.6 + (22 * 4.35) + 25 * (1.3 + (48 * 0.0645))] = 2472 A

Table 11. Breakdown of current consumption

Label

Phase

I (mA)

t (ms)

Q (

C) = I x t

Pre-calibration

13.0

3.2

41.6

Ranging

22.0

per ms

22.0 per ms

Readout averaging

25.0

per ms

25.0 per ms

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