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EM Microelectronic - Ultra Low Power Capacitive Touch Sensor Interface IC

Numéro de référence EM6420
Description Ultra Low Power Capacitive Touch Sensor Interface IC
Fabricant EM Microelectronic 
Logo EM Microelectronic 





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EM6420 fiche technique
EM MICROELECTRONIC - MARIN SA
EM6420www.DataSheet4U.com
Ultra Low Power Capacitive Touch Sensor Interface IC
Description
The EM6420 is an ultra low power Touch Sensor Interface
IC able to scan sequentially up to 16 capacitive sensors.
The device parameters (number of used sensors, sensors
scan frequency, sensors sensitivity level, IRQ condition)
are configurable either from a host microcontroller through
a communication port or through configuration inputs.
Recognised touch inputs will be signaled with an active
edge at the IRQ pad and data are ready to be read through
the communicaion port by the host MCU. Conditions for the
IRQ to get active are configurable : at the end of every
scan, at the end of a scan if at least one sensor is active or
at the end of a scan if the sensors state has changed.
The EM6420 can also detect the most active sensor in
applications where sensors are tightly spaced. It compares
relative levels among sensors and selects the sensor with
the largest signal strength.
To increase the number of sensors >16, use several
EM6420 in parallel.
Depending on the selected supply voltage range, 3 or 4
decoupling capacitors are required for the entire
functionality of the EM6420 from -40 to + 85°C.
Features
Up to 16 analogue sensor inputs
User selectable communication interfaces : 4-wire SPI,
I2C, 4-bit parallel interface and 8-bit direct output
User-selectable active edge IRQ output signal
Active high enable input
No software development and tuning required
Development tools and documentations available
Complete touch module available: IC + electrodes
design on various non-conductive substrates
Electrical Characteristics
Supply voltage
Power consumption
Low Power Mode
Ultra Low Power
Mode
1.2 V to 2.0 V or 2.2 to 3.6 V
8.0 µA @ 3.0 V (14.5 µA
@1.5 V) for 16 sensors
scanned at 8 Hz
2.0 µA @ 3.0 V (5.0 µA
@1.5 V) for 16 sensors
scanned at 8 Hz
Nominal sensor
capacitance
3 to 31 pF
Sensors
frequency
scan
1 Hz to 128 Hz *frequency
depending on number of
sensors
COM clock frequency up to 400 kHz
Availability
Naked die
SMT package MLF32-36-40
Design Considerations
The EM6420 is well suited for battery and mains powered
applications where the following features are important :
Tamper proof applications
Nice and clean designs
Touch function to avoid buttons and keys
Slider functions
Hygienic issues, cleaning aspects
Waterproof designs
Applications
Mobile phones, cordless phones
PDA, keyboards
White & brown goods
Toys
Lighting - Sliders for dimming
Copyright 2010, EM Microelectronic-Marin SA
6420-DS.doc, Version 2.0, 10-Jun-10
1
www.emmicroelectronic.com

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