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SX8635I05AWLTRT Datasheet(PDF) 10 Page - Semtech Corporation |
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SX8635I05AWLTRT Datasheet(HTML) 10 Page - Semtech Corporation |
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10 / 81 page  ADVANCED COMMUNICATIONS & SENSING DATASHEET Revision 7_8, October 10 © 2010 Semtech Corp. www.semtech.com 10 SX8635 Low Power, Capacitive Button and Wheel Touch Controller (12 sensors) with Enhanced LED Drivers and Proximity Sensing 3 FUNCTIONAL DESCRIPTION 3.1 Quickstart Application The SX8635 is preconfigured (Quickstart Application) for an application with 6 buttons, a wheel (consisting of 6 sensors) and 8 LED drivers using logarithmic PWM fading. Implementing a schematic based on Figure 6 will be immediately operational after powering without programming the SX8635 (even without host). cap2 cap3 cap4 cap5 cap6 cap8 cap7 cap9 gnd gpio5 gpio4 gpio3 gpio2 gpio1 gnd gpio0 cap1 cap0 cap10 cap11 analog sensor interface micro processor RAM ROM NVM I2C GPIO controller power management clock generation RC PWM LED controller bottom plate d1 d0 d2 d3 d4 d5 d6 d7 d0 d1 d2 d3 d4 d5 d6 d7 SX8635 HOST Figure 6 Quickstart Application Touching the sensor on the CAP0 pin will enable automatically the LED connected to GPIO0. When the CAP0 sensor is released the LED on GPIO0 will slowly fade-out using smooth logarithmic fading. All other sensors (CAP1 to CAP5) have their own LED associated on a GPIO pin showing a touch or a release. The sensors on CAP6 to CAP11 are used in a wheel configuration. A moving finger on the wheel will enable the LED on GPIO6 or GPIO7 indicating the finger rotation direction. The sensor detection and the LED fading described above are operational without any host interaction. This is made possible using the SX8635 Autolight feature described in the following sections. 3.2 Introduction 3.2.1 General The SX8635 is intended to be used in applications which require capacitive sensors covered by isolating overlay material and which need to detect the proximity of a finger/hand though the air. A finger approaching the capacitive sensors will change the charge that can be loaded on the sensors. The SX8635 measures the change of charge and converts that into digital values (ticks). The larger the charge on the sensors, the larger the number of ticks will be. The charge to ticks conversion is done by the SX8635 Analog Sensor Interface (ASI). The ticks are further processed by the SX8635 and converted in a high level, easy to use information for the user’s host. |
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