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DESIGNING SYSTEMS WITH HALIOS® SWITCH
Scope
This application note provides information about how
to design systems with the HALIOS®switch E909.01
and gives examples of schematics and appropriate
surface materials.
E909.01
Features
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Two outputs for Proximity and Touch function
SPI interface for measurement data
Selfcalibration capability
Operational up to
200klux
ambient light
Package SOP16 or TSSOP16
Supply voltage:
3.3V
to
5.0V
–
40°C
to +85°C operating temperature
General Description
The HALIOS® principle highly improves sensitivity and
robustness against disturbances of sensor systems.
Therefore it is possible to realize, e.g. touch or
approach detection systems based on a capacitive
working principle even in metal shielded environment
or optical input devices under high ambient light con-
ditions. The E909.01 is an optical switch which is able
to suppress the influence of ambient light by using
the HALIOS® working principle. The device detects the
rapprochement of objects and additionally indicates
when the object touches the surface. These functions
are available on the device pins PROX and Touch.
Further, the corresponding measurement values can
be readout via SPI interface. Elmos recommands the
integrated optical module TCND3000 for optimized
optical sensitivity.
Applications
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Waterproof switches
Switch for anti-septic environment
Switch with background lighting function
Proximity sensing
Optical key pad array
VDD
VDD
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Translucent
surface
D
S_obj
D
S_surf
D
S
= D
S_int
+ D
S_surf
+ D
S_obj
IR-Emitter LEDS
(Transmitter)
Photodiode
IR-Emitter LEDC
(Compensation)
100µF
10
100µF
DVDD
AVDD
DVDD
TIN
Filter
Demod.
SCK
SPI
MOSI
VDD
VDD
VDD
LEDC
Touch a / LDB
Touch b / MISO
LEDS
D
S_int
TCND3000
D
C
control
EN_SPI
SWTO
PROX
LEDC
LEDS
GND
TIN
SYI
SYO
AVSS
DVSS
200pF
ELMOS Semiconductor AG
Application Note
QM-No.: 03AN0801E.01
1/39
100k
500
500
ELMOS [ ELMOS SEMICONDUCTOR AG ]
