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| EM MICROELECTRONIC - MARIN SA EM6420 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. No software development is required. 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 + 85C. Features Up to 16 analogue sensor inputs User selectable communication interfaces : 4-wire SPI, 2 I C, 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 solution/module available: IC + sensors design on any subtract Design Considerations The EM6420 is well suited for battery and mains powered applications where the following features are important : Electrical Characteristics 1.2 V to 2.0 V 2.2 V to 3.6 V Power consumption active 8.5 A @ 3.0 V Power consumption standby 5.5 A @ 3.0 V Power consumption sleep 0.6 A @ 3.0 V Nominal sensor capacitance 3 to 31 pF Sensors scan frequency 1 Hz to 128 Hz * * frequency depending on number of sensors COM clock frequency up to 400 kHz or Supply voltage 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 Availability Naked die SMT package MLF40 Copyright (c) 2008, EM Microelectronic-Marin SA Subject to change without notice Rev. B, 10/08 Phone: +41.32.755-5111, Fax: +41.32.755-5403 www.emmicroelectronic.com info@emmicroelectronic.com |
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