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231AZZ Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers |
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5 / 36 page ProxSense ® Series Copyright © Azoteq 2016 IQS231A Datasheet v1.3 Page 5 of 36 All Rights Reserved Check for latest datasheet December 2016 2 Reference Schematics: Figure 2.1 IQS231A DFN10 reference schematic Footnotes: * R2: Place a 40Ω resistor in the VDDHI supply line to prevent a potential ESD induced latch- up. Maximum supply current should be limited to 80mA on the IQS231A VDDHI pin to prevent latch-up. ** C4 & C5: Choose these capacitors based on the selected sampling rate 30Hz 100Hz 8Hz 4Hz C4 1uF 1uF 2.2uF 4.7uF C5 1uF 1uF 4.7uF 10uF ***C2: Example load of 10pF. This value may vary to adjust sensitivity. 1pF for higher sensitivity and up to 60pF for proximity detection use. ****R1: Vary this value to control the RC slope of the capacitance measurement signal. Use for harmonic suppression and to enable a high impedance sensing path in a low impedance system. IQS231A DFN10 IO1/SCL IO2/SDA GND IO2/SDA LK1 2W-SLink Open Standalone option: Sensitivity input GND for more sensitivity VDDHI Configure these resistors for IQS231A I2C operation. PIN8: IQS231A SDA Pull-up PIN9: IQS231A SCL Pull-up R2 4.7K R3 4.7K VDDHI IO1/SCL IO2/SDA IO2/SDA IO1/SCL VREG VDDHI NC NC NC NC 40R * ** ** *** **** VIN |
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