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IQS3160QFR Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers |
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IQS3160QFR Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers |
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11 / 28 page  IQ Switch ® ProxSense ® Series Copyright © Azoteq (Pty) Ltd 2015 IQS316 Datasheet Page 11 of 28 All rights reserved. Revision 1.03 November 2015 automatic selection are highlighted in the table. Table 4.1 Automatic Shield Setting Channels Group SHLD_A SHLD_B 0 CxA0 CxB0 1 CxA0 CxB0 2 CxA1 CxB1 3 CxA2 CxB2 4 CxA3 CxB3 The active driven shields follow the waveforms of the sensor lines. A screenshot of two pairs of shield and sensor lines are illustrated in Figure 4.2. It can be seen that generally 2 different channels have very similar signals, and it has been found that the shield of a specific channel can be effectively used to shield the other channels in the same timeslot (Group). Figure 4.2 Active shields Pull-up resistors are required on each shield line as shown in Figure 6.9 and Figure 6.10. A suggested value for the pull-up resistors are 2kΩ when using the controller at 3.3V, and 4.7kΩ when using the controller at 5V. Smaller resistor values will increase the driving ability of the shield, but will also increase the current consumption. For more information regarding shielding, refer to the application note “AZD009 Implementation of Driven Shield ”. 4.3 Proximity Output (POUT) All the individual PROX status for each channel is available through the device memory map, but an additional POUT I/O has been added. This I/O is active HIGH when any of the PROX channels (CH0 – CH3) sense a PROX. This could, for example, be used to control the backlighting of an application. 4.4 Zero Cross Synchronising When an application is operated in a noisy AC environment, it could be required to synchronise the charging to the AC. This reduces the noise influence on the count value. This is not normally required since the Prox Mode filters should remove this AC component, but is available if needed. If unused, it is best to connect directly to GND. 4.5 Device Sleep The IQS316 can be placed in low power SLEEP mode. This however is a totally inactive state, and no channel sensing is performed. This could be used if an application does not require the keys to be sensed, or if custom low power mode is implemented. All the device settings and data is retained after waking from the sleep. 4.6 Communication Bypass The IQS316 can be set up to bypass the communication window. This could be useful if a master does not want to be interrupted during every charging cycle of the IQS316. The communication will be resumed (Ready will indicate available data) if the IQS316 senses a proximity. The master can also initiate communication if required (only in SPI). Therefore the master sends a command to bypass the communication. The IQS316 then continually does conversions without interaction with the master, until a proximity occurs, which is most likely the first time that the master will be interested in the IQS316 data. If the master wants to force the communication to resume in SPI mode, then |
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