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VL6180 bảng dữ liệu(PDF) 19 Page - STMicroelectronics

tên linh kiện VL6180
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VL6180 bảng dữ liệu(HTML) 19 Page - STMicroelectronics

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VL6180
Functional description
69
Figure 12. Asynchronous mode
2.6
Range timing
Figure 13 gives a breakdown of total execution time for a single range measurement.
The pre-calibration phase is fixed (3.2 ms).
The range convergence time is variable and depends on target distance/reflectance
(see Table 7).
The recommended readout averaging period is 4.3 ms. Readout averaging helps to
reduce measurement noise. The recommended setting for
READOUT__AVERAGING_SAMPLE_PERIOD{0x10A}
is 48(c) but is programmable in
the range 0-255. Note however that lower settings will result in increased noise.
Register READOUT__AVERAGING_SAMPLE_PERIOD{0x10A} is not programmable via the
API.
Note:
When a target is detected the API returns the actual range convergence time. The
convergence time returned by the API does not include the readout average. Range
convergence and readout averaging must be completed within the specified max
convergence time.
VL6180x_RangeSetMaxConvergenceTime() - sets maximum time to run measurement in
all ranging modes. Range = 1 - 63 ms; measurement aborted when limit reached. Effective
max convergence time depends on the actual convergence time plus readout averaging
sample period setting.
c. Default readout averaging period is calculated as follows: 1300 µs + (48 x 64.5 µs) = 4.3 ms



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