231AZZ datasheet(5/36 Pages) ETC2

Part #	231AZZ

Description	Integrated SAR user interface offering a simple GPIO output

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ProxSense

® Series

IQS231A Datasheet v1.3

Page 5 of 36

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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

2.2uF

4.7uF

C5

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

IO1/SCL

VREG

VDDHI

NC

40R

*

**

***

****

VIN

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