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IQS316 Datasheet(PDF) 9 Page - List of Unclassifed Manufacturers |
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IQS316 Datasheet(HTML) 9 Page - List of Unclassifed Manufacturers |
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9 / 26 page  IQ Switch ® ProxSense ® Series Copyright © Azoteq (Pty) Ltd 2012. IQS316 Datasheet Page 9 of 25 All Rights Reserved. IQS316_datasheet_V0.05.docx July 2012 individually be setup to a value within the selected range. 3.3.9 Proximity Sensitivity (Prox and Touch Mode channels) The proximity sensitivity of each individual channel is a user defined threshold calculated as a delta value below the LTA. A PROX status is detected when the count value drops below the selected delta relative to the LTA. Table 3.4 Prox Thresholds LOW Range HIGH Range 2 8 (default) 3 16 4 20 6 30 Again four values exist for each channel, and again a global secondary range can be selected, changing the 4 available settings for all channels to a new set of 4 possibilities. 3.3.10 Antenna Tuning Implementation The ATI is a sophisticated technology implemented in the new ProxSense ® series devices. It allows optimal performance of the devices for a wide range of sensing electrode capacitances, without modification or addition of external components. The ATI allows the tuning of two parameters, an ATI Multiplier and an ATI Compensation, to adjust the count value for an attached sensing electrode. ATI allows the designer to optimise a specific design by adjusting the sensitivity and stability of each channel through the adjustment of the ATI parameters. Please refer to Azoteq Application Note AZD027 for more information regarding ATI. The IQS316 has an automated ATI function. This allows the designer to specify a count target value for either the Prox- or Touch Mode channels, and then when activated, the system will increment the relevant ATI Compensation settings until the channels reach the target value. 4 Additional Features 4.1 RF Immunity The IQS316 has immunity to high power RF noise. In this section general design guidelines will be given to improve noise immunity and the noise detection functionality is explained. 4.1.1 Design Guidelines To improve the RF immunity, extra decoupling capacitors are suggested on VREG and VDDHI. Place a 100pF in parallel with the 1uF ceramic on VREG and VDDHI. All decoupling capacitors should be placed as close as possible to the VDDHI and VREG device pins. PCB ground planes also improve noise immunity. Care must be taken to not pour these planes near the tracks/pins of the sensing lines, see Figure 4.1. Ground/voltage planes close to the sensing channels have a negative effect on the sensitivity of the sensors. Note, if I/O‟s are used instead of the sensor lines, the ground pour can also go under these pins. GND MOSI-I2CAO 1 SOMI-SDA 2 RDY 3 SCK-SCL 4 /SS-IRDY 5 POUT SPI_ENABLE 7 /MCLR 8 17 CxB0 18 CxB1 19 CxB2 20 CxB3 21 CxA0 22 CxA1 23 CxA2 24 CxA3 Figure 4.1 Ground plane routing 4.1.2 RF detection In cases of extreme RF interference, the on- chip RF detection is suggested. By connecting a suitable antenna to the RF pin, it allows the device to detect RF noise and notify the master of possible corrupt data. A 50Ω |
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