Step Sensor status

Saturated pixels

Valid pixels

Modulated light

amplitude

Ambient to

modulated light

Action

MAX_SAT_PIX

MIN_VALID_PIX

AMR

1

Saturation or bright ob-

ject within scene

> max. limit (e.g. 5)

Repeat measurement with

decreased integration time and/or illumination

2

Saturation or bright ob-

ject within scene

< max. limit

< min. limit (e.g. 60)

Repeat measurement with

decreased integration time and/or illumination

3

Over-exposure or bright

object within scene

< max. limit

> min. limit

> 1'000 LSB

Repeat measurement with

decreased integration time or illumination

4

No object detected

< max. limit

> min. limit

<

50 LSB

Repeat measurement with

increased integration time or illumination

5

Too much ambient-light

< max. limit

> min. limit

50 LSB … 1'000 LSB

> 60 db (or > 70 dB)

Repeat measurement with

increased integration time or illumination

6

Object detected

< max. limit

> min. limit

Excellent: 100 … 1'000 LSB

Sufficient

50 … 100 LSB

< 60 db (or < 70 dB)

No action necessary

Note: min. and max limits are customer defined acceptable values depending on the application

Table 6: Quality decision matrix

1.3.5. Ambient-light measurement (optical power-meter)

Instead of reading distance data, the epc600 chip can measure the ambient-light level (Refer to 3.2.1.: Command: Commands & Integra-

tion times and 3.2.5.: Response: Ambient-light level). Functions of this feature are:

■ Use to compensate deviations in the distance measurement caused by the presence of ambient-light.

■ Monitor the ambient-light level during the distance measurement to prevent faulty conditions.

■ Use the ecp600 as an optical power-meter (“Luxmeter”) e.g. for brightness control.

■ or in combination e.g. where the presence or absence of an object in the environmental illumination needs to be controlled.

chapter 3.2.5.: Response: Ambient-light level) in the following way:

t

INT-REF-DC

t

INT-DC

e.g.

E

nW

/cm

2

LSB

⋅

103

μ s

1.6

μ s

⋅1'000 LSB = 792μ W /cm

2

Notes:

modulated light amplitude.

■ The ambient-light measurement is a metering functionality only, which can be used for distance correction or ambient-light reading. It is

completely independent of the chip internal ambient-light suppression function that eliminates DC light components from the measure -

ment signal (refer to chapter 1.3.3.: Ambient-light suppression).

1.3.6. Temperature metering

An on-chip temperature sensor provides uncalibrated temperature readings. The data access follows the protocol in Figure 13, second

section.

■ This allows compensation of signal drifts caused by changing thermal conditions in the light source and the sensor.

■ If the user does his own calibration (e.g. °C or F), he can use it as a temperature sensor too.

© 2014 ESPROS Photonics Corporation

Characteristics subject to change without notice

14 / 30

Datasheet epc600 - V1.3

www.espros.ch