Capacitive Touch Platform Offers High Resolution Sensing

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A family of capacitive touch ICs for a wide range of home appliances and consumer electronics enhances the ECO mode present in many green home electronics by integrating an IR decoder for system wake up. This enables the host to go into sleep mode during system standby and minimizes the overall power consumption.

The analog sensor front end in the SX95xx platform from Semtech is equipped with a high-resolution ADC, which can detect down to 4fF of capacitance and is optimized for robust touch and proximity detection. These controllers also feature an advanced 256-step LED driver for various blinking and breathing control providing enhanced visual feedback in TV applications. Each device is designed with circuitry that combines the capacitive sensor with the LED driver to reduce the overall solution footprint.

The SX9510/11/12/13 are in an 8-channel configuration that are offered as space-saving 4 mm x 4 mm 20-QFN and 4.4 mm x 7.8 mm 24-TSSOP packages; and the SX9500/01 provide 4-channels  in a tiny 3 mm x3 mm 20-QFN package. Semtech guarantees all of these devices to operate over the extended (-40° to +85°C) temperature range.

Key features include a high-resolution touch sensing solution in eight- and four-channel versions with options for enhanced proximity sensing, integrated IR decoder for ECO system design, built-in LED drivers for visual feedback and an on-chip buzzer control for audible feedback. In addition, automatic compensation eliminates false triggers from environmental factors. Semtech offers comprehensive design assistance, including field- and factory-based support, data sheets, volume pricing and delivery quotes, as well as evaluation kits and samples.

Camarillo, CA.
(805) 498-2111