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SX8636 Datasheet(PDF) 10 Page - Semtech Corporation |
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SX8636 Datasheet(HTML) 10 Page - Semtech Corporation |
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10 / 71 page  ADVANCED COMMUNICATIONS & SENSING DATASHEET Revision 7_5, September 10 © 2010 Semtech Corp. www.semtech.com 10 SX8636 Low Power, Capacitive Button Touch Controller (8 sensors) with Enhanced LED Drivers and Proximity Sensing 3 FUNCTIONAL DESCRIPTION 3.1 Quickstart Application The SX8636 is preconfigured (Quickstart Application) for an application with eight buttons and eight LED drivers using logarithmic PWM fading. Implementing a schematic based on Figure 6 will be immediately operational after powering without programming the SX8636 (even without host). HOST SX8636 cap2 cap3 cap4 cap5 cap6 cap7 gnd gpo5 gpo4 gpo3 gpo2 gpo1 gnd gpo0 analog sensor interface micro processor RAM ROM NVM I2C GPIO controller power management clock generation RC PWM LED controller bottom plate cap0 cap1 d1 d0 d2 d3 d4 d5 d6 d7 d0 d1 d2 d3 d4 d5 d6 d7 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 CAP7) have their own LED associated on a GPIO pin showing a touch or a release. The sensor detection and the LED fading described above are operational without any host interaction. This is made possible using the SX8636 Autolight feature described in the following sections. 3.2 Introduction 3.2.1 General The SX8636 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 SX8636 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 SX8636 Analog Sensor Interface (ASI). The ticks are further processed by the SX8636 and converted in a high level, easy to use information for the user’s host. The information between SX8636 and the user’s host is passed through the I2C interface with an additional interrupt signal indicating that the SX8636 has new information. For buttons this information is simply touched or released. |
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