IQS231 Datasheet, PDF (4/37 Pages) List of Unclassifed Manufacturers – Single Channel Capacitive Proximity/Touch Controller for SAR applications

ProxSense^® Series
1 Summary: Packaging and Pin-Out
IO1 / SCL 1
VSS 2
IO2 / SDA / Tx 3
IQS
231
6 Cx / Rx
5 VDDHI
4 VREG
Figure 1.1 IQS231 pin-out (TSOT23-6 package)
Table 1.1 Pin-out description
Pin
Name
1 PRIMARY I/O
2 VSS
3
SECONDARY I/O
/ Tx
4 VREG
5 VDDHI
6 Cx
IQS231 in TSOT23-6
Type
Function
Digital Input/Output Multifunction IO1 / SCL (I²C Clock signal)
Signal GND
Digital Input/Output
Multifunction IO2 / SDA (I²C Data output) /
Tx
Regulator output
Requires external capacitor
Supply Input
Supply:1.75V – 3.6V
Sense electrode
Connect to conductive area intended for
sensor
Table 1.2 Multifunction pin descriptions
Multifunction pin name
IO1
IO2
Multifunction pin option
Proximity output / Proximity output with heartbeat
Sensitivity input / Synchronization input /
Movement output / Touch output
VDDHI VDDHI
VIN
GND
C3
C4
1uF
100pF
U1
5 _VDDHI
2 _VSS
IQS231
CX/RX ⁶
IO1/SCL ¹
IO2/SDA/TX ³
VREG ⁴
IO1/SCL
IO2/SDA/TX
C1
1uF
R1
CX
470R
C5
10pF
GND
C2
100pF
Option: Sensitivity input
GND for more sensitivity
LK1
IO2/SDA/TX
2W-SLink Open
IO1/SCL
GND
GND
GND
Configure these resistors for IQS231 I2C operation.
PIN3: IQS231 SDA Pull-up
VDDHI
PIN1: IQS231 SCL Pull-up
VDDHI
R2
4.7K
IO2/SDA/TX
R3
4.7K
IO1/SCL
GND
GND
Optional: LED and current limiting resistor
PIN1: Output LED and current limiting resistor
on primary output
VDDHI
R4
1.0K
BLUE
DS1
IO1/SCL
GND
IO2/SDA
IO1/SCL
Copyright © Azoteq 2015
All Rights Reserved
Figure 1.2 IQS231 reference schematic
IQS231 Datasheet v1.3
Check for latest datasheet
Page 4 of 37
November 2015