E909.01 Datasheet, PDF (1/39 Pages) ELMOS Semiconductor AG – DESIGNING SYSTEMS WITH HALIOS® SWITCH

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DESIGNING SYSTEMS WITH HALIOS® SWITCH
E909.01
Scope
Features
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.
General Description
ÿ Two outputs for Proximity and Touch function
ÿ SPI interface for measurement data
ÿ Selfcalibration capability
ÿ Operational up to 200klux ambient light
ÿ Package SOP16 or TSSOP16
ÿ Supply voltage: 3.3V to 5.0V
ÿ – 40°C to +85°C operating temperature
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
ÿ Waterproof switches
ÿ Switch for anti-septic environment
ÿ Switch with background lighting function
ÿ Proximity sensing
ÿ Optical key pad array
Translucent
surface
DS_obj
DS_surf
DS = DS_int + D + S_surf DS_obj
IR-Emitter LEDS
(Transmitter)
Photodiode
IR-Emitter LEDC
(Compensation)
DS_int
DC
TCND3000
200pF
DVDD
TIN
LEDC
LEDS
VDD
VDD
100µF
AVDD
100µF
DVDD
Filter
Demod.
SPI
control
AVSS
DVSS
SCK
MOSI
Touch a / LDB
Touch b / MISO
EN_SPI
SWTO
PROX
SYI
SYO
VDD VDD VDD
ELMOS Semiconductor AG
Application Note
1/39
QM-No.: 03AN0801E.01