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SX8663 датащи(PDF) 22 Page - Semtech Corporation |
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SX8663 датащи(HTML) 22 Page - Semtech Corporation |
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22 / 64 page ![]() ADVANCED COMMUNICATIONS & SENSING Rev5 4 th August 2011 © 2011 Semtech Corp. www.semtech.com 22 SX8663 Capacitive Button Matrix (up to 36) and Proximity Controller with Individual LED Drivers and Buzzer Output 3.13.4 Example A typical example of the assertion and clearing of the INTB and the I2C communication is shown in Figure 18. Figure 18 Interrupt and I2C When a button is touched the SX8663 will assert the interrupt (1). The host will read the SX8663 status information over the I2C (2) and this clears the interrupt. If the finger releases the button the interrupt will be asserted (3), the host reads the status (4) which clears the interrupt. In case the host will not react to an interrupt then this will result in a missing touch. 3.14 Reset The reset can be performed by 3 sources: - power up, - RESETB pin, - software reset. 3.14.1 Power up During power up the INTB is kept low. Once the power up sequence is terminated the INTB is released autonomously. The SX8663 is then ready for operation. Figure 19 Power Up vs. INTB |
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