413101 Detector Datasheet

413101 Datasheet, PDF, Equivalent


Part Number

413101

Description

Visible Light Detector

Manufacture

Seme LAB

Total Page 12 Pages
Datasheet
Download 413101 Datasheet


413101
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413101
Visible Light Detector with Analog
and Digital Outputs
DESCRIPTION
The 413101 is a low cost 4-pin visible
light sensor, with a current output which
is directly proportional to the light level.
It has a built in optical filter to provide a
response which is close to the human
eye, or “photopic”. It also has a digital
output to provide on/off switching, with
hysteresis to prevent flicker.
The output current can be converted
to a voltage by connecting it in series
with a resistor. The dynamic range is
determined by the external resistor and
power supply (e.g. 10K and 5V gives a
range of 0 to over 250 Lux, but can be
up to 1000 lux with a 1K resistor). The
internal dark current cancellation
enables high accuracy over the full
temperature range, even at low light
levels.
FEATURES
Near human eye photopic response
High IR rejection – integrated optical filter
Current output highly linear vs light level
1uA per lux current output
External resistor sets linear lux range
Temperature stable
Integrated high gain photo-current amplifier
Dark-current cancellation
Digital output for on/off switching
Hysteresis to prevent flicker close to switching
threshold
APPLICATIONS
Dawn/dusk sensing
Security lighting
Night-lights
LCD backlight control
1.0 Basic application & test circuit
Figure A
Supply
VDD
DIG_OUT
413101
ADJ VSS
VADJ
RSS
On/Off
Signal
The 413101 is supplied as
probed wafers.Failing die are
marked with black ink-dots.
Pin Description
VDD – Positive supply
ADJ – Adjust (analog output)
VSS – Ground
DIG_OUT – Digital output (on/off signal)
Preliminary Datasheet
Revision A
This document is the property of Semefab (Scotland) Ltd and is furnished in confidence
and upon the condition that it is neither copied nor released to a third party without prior
consent.
Page 1 of 12

413101
413101
Visible Light Detector with Analog
and Digital Outputs
2.0 FUNCTIONAL DESCRIPTION
Refer to the block diagram Figure B.
Light falling on the 413101 is converted to current by the photodiode PD1. PD2 is also a photodiode
but it is covered by a metal layer so that it will not respond to light. At normal temperatures the dark
current is very low, however at high temperatures without the dark current cancelling circuit it would
become a significant source of error especially at low light levels. The dark current from PD2 is
subtracted from the dark current and photo-current of PD1, the resultant current is multiplied by a
linear high gain current amplifier and the multiplied current is available as source current from the
ADJ pin. The photodiodes are covered by a multi-layer optical filter, which removes the IR light. With
this optical filter the 413101 has an approximately “eye like” or photopic spectral response.
The primary function of the 413101 is to convert light to an output current at ADJ pin. The
source current from the ADJ pin is proportional to the illumination on the device, at approximately
1uA per Lux. The 413101 has additional circuits to provide a digital ON/OFF output at the DIG_OUT
pin in response to the voltage at the ADJ pin. The current out of the ADJ pin will normally be
converted to a voltage by a resistor between ADJ and ground. A 10K resistor would provide a
10mV/lux output voltage at the ADJ pin. The internal resistor chain sets threshold voltages at the
inputs of the comparators COMP1 and COMP2. The positive input of COMP1 is set to 0.15*VDD and
the negative input of COMP2 to 0.1* VDD. When the voltage on the ADJ pin is less than 0.1*VDD the
flip-flop (U1/U2) is set and the DIG_OUT pin is switched high. When the voltage on the ADJ pin is
higher than 0.15* VDD, the flip-flop is reset and the DIG_OUT pin is switched low. This “hysteresis”
prevents flickering of lamps or chattering of relays when the light level at the sensor is close to the
switching threshold.
Preliminary Datasheet
Revision A
This document is the property of Semefab (Scotland) Ltd. And is furnished in
confidence and upon the condition that it is neither copied or released to a third
party without prior consent.
Page 2 of
12


Features www.DataSheet4U.com 413101 Visible Ligh t Detector with Analog and Digital Outp uts DESCRIPTION The 413101 is a low co st 4-pin visible light sensor, with a c urrent output which is directly proport ional to the light level. It has a buil t in optical filter to provide a respon se which is close to the human eye, or “photopic”. It also has a digital o utput to provide on/off switching, with hysteresis to prevent flicker. The out put current can be converted to a volta ge by connecting it in series with a re sistor. The dynamic range is determined by the external resistor and power sup ply (e.g. 10K and 5V gives a range of 0 to over 250 Lux, but can be up to 1000 lux with a 1K resistor). The internal dark current cancellation enables high accuracy over the full temperature rang e, even at low light levels. FEATURES • • • • • • • • • • Near human eye photopic response High IR rejection – integrated optical fil ter Current output highly linear vs light level 1uA per lux current output External resis.
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