VL6180 datasheet(21/73 Pages) STMICROELECTRONICS

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VL6180

Functional description

2.8

Range checks

Error codes 6, 8 & 11 in Table 8 are configurable by the user (SNR, error 11, has not yet

been integrated into the API).

2.8.1

Early convergence estimate (ECE)

Note:

Early convergence estimate (ECE) is not used, by default, in extended ranging mode.

Early convergence estimate (ECE) is a programmable feature designed to minimize power

consumption when there is no target in the field-of-view (FOV).

The system is said to have ‘converged’ (i.e. range acquired), when the convergence

threshold(d) is reached before the max. convergence time limit (see Figure 14). This ratio

specifies the minimum return signal rate required for convergence. If there is no target in the

FOV, the system will continue to operate until the max. convergence time limit is reached

before switching off thereby consuming power. With ECE enabled, the system estimates the

return signal rate 0.5 ms after the start of every measurement. If it is below the ECE

threshold, the measurement is aborted and an ECE error is flagged.

9-10

Not used

Signal to Noise Ratio

Ambient conditions too high. Measurement not

valid

12/14

Range underflow

Range value < 0



If the target is very close (0-10mm) and the offset

is not correctly calibrated it could lead to a small

negative value

13/15

Range overflow

Range value out of range. This occurs when the

target is detected by the device but is placed at a

high distance resulting in internal variable

overflow.



Proximity ranging, target > 200mm (scaling = 1)

Extended ranging, target > 550mm (scaling = 3)

Ranging_Filtered

Distance filtered by Wrap Around Filter (WAF).

Occurs when a high reflectance target is

detected between 600mm to 1.2m

Not used

Data_Not_Ready

Error returned by

VL6180x_RangeGetMeasurementIfReady()

when ranging data is not ready

Table 8. Range error codes (continued)

Bits [7:4]

Error code

Description

d. For proximity ranging, the convergence threshold is set to 10240. The convergence threshold register is not

accessible by the user.

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