IQS232-00000000-SOR

IQ Switch® ProxSense® Series IQS232 Datasheet - Configurable 2 Channel sensor with Compensation for Sensitivity Reducing Objects Unparallelled Features:  Sub 4 µA current consumption  Automatic tuning for optimal operation in various environments & compensation against sensitivity reducing objects The IQS232 ProxSense® IC is a fully integrated two channel capacitive contact and proximity sensor with market leading sensitivity and automatic tuning of the sense electrodes. The IQS232 provides a minimalist implementation requiring as few as 2 external components. The device is ready for use in a large range of applications while programming options allow customisation in specialised applications. Main features:  2 Channel input device  Differentiated Touch and Distributed Proximity Electrode  ATI: Automatic tuning to optimum sensitivity  Supply Voltage1.8 V to 3.6 V  Internal voltage regulator and reference capacitor  OTP options available  Direct (logic level) and serial data output  Low Power Modes (sub 4 µA min)  Adjustable Proximity & Touch Thresholds  Automatic drift compensation  Development and Programming tools available  Small and cost effective SO-8 package Applications:  White goods and appliances  Remote Controls  Office equipment, toys, sanitary ware  Proximity detection that enables back lighting activation (Patented)  Wake-up from standby applications  Replacement switches for electro mechanical  GUI trigger on proximity detection. Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 Page 1of 32 September 2017 IQ Switch® ProxSense® Series Contents List of Figures 3 List of Tables 3 Revision History 3 List of Symbols 4 1 Functional Overview 1.1 Pin Outs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Applicability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5 6 2 Analogue Functionality 6 3 Digital Functionality 6 4 Reference Design 4.1 Power Supply and PCB Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2 Design Rules for Harsh EMC Environments . . . . . . . . . . . . . . . . . . . . . . . 7 7 8 5 High Sensitivity 9 6 User Configurable Options 6.1 Configuring of Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 9 7 Description of User Options 7.1 ATI Method . . . . . . . . 7.2 Touch Base Values . . . . 7.3 Touch Thresholds . . . . . 7.4 Proximity Threshold . . . . 7.5 Halt time . . . . . . . . . . 7.6 Proximity Base Value . . . 7.7 Sensitivity Multipliers . . . 7.8 Base Multipliers . . . . . . 7.9 Base Select . . . . . . . . 7.10 Charge Transfer Frequency 7.11 Streaming mode . . . . . . 7.12 Noise Detect . . . . . . . . 7.13 Low Power Mode . . . . . 7.14 Guard Channel . . . . . . 7.15 Output Logic Select . . . . 7.16 ATI Delay . . . . . . . . . 7.17 ATI Target . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Charge Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 15 15 15 15 16 16 16 16 16 17 17 17 18 19 19 19 19 20 9 Auto Tuning Implementation 21 9.1 Full ATI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 9.2 Partial ATI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 10 Specifications Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved 23 IQS232 Datasheet Revision 1.04 Page 2of 32 September 2017 IQ Switch® ProxSense® Series 11 Mechanical Dimensions 25 12 Device Marking 28 13 Ordering Information 28 14 Memory Map 29 15 Contact Information 32 List of Figures 1.1 4.1 4.2 7.1 8.1 11.1 11.2 11.3 IQS232 pin-out. . . . . . . . IQS232 Reference Design. . EMC Design Choices. . . . . LP Modes: Charge cycles. . Charge Transfer for IQS232. SO 8 Package . . . . . . . . SO 8 Footprint. . . . . . . . SO 8 Silk Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 7 8 19 20 25 26 26 IQS232 Pin-outs . . . . . . . . . . . . . . . . . . . . . . . . User Selectable Configuration Options: Bank 0 . . . . . . . User Selectable Configuration Options: Bank 1 (Full ATI) . . User Selectable Configuration Options: Bank 1 (Partial ATI) User Selectable Configuration Options: Bank 2 . . . . . . . User Selectable Configuration Options: Bank 3 . . . . . . . Distributed proximity channel’s base values. . . . . . . . . . IQS232 Low Power Mode Timings . . . . . . . . . . . . . . IQS232 General Operating Conditions . . . . . . . . . . . . Start-up and shut-down slope Characteristics . . . . . . . . POUT and TOUT Characteristics for each I/O . . . . . . . . Initial Touch Times . . . . . . . . . . . . . . . . . . . . . . Repetitive Touch Rates . . . . . . . . . . . . . . . . . . . . SO-8 Package Dimensions. . . . . . . . . . . . . . . . . . . SO 8 Footprint Dimensions . . . . . . . . . . . . . . . . . . SO-8 Silk Screen Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 10 11 12 13 14 17 18 23 23 23 24 24 25 26 27 List of Tables 1.1 6.1 6.2 6.3 6.4 6.5 7.1 7.2 10.1 10.2 10.3 10.4 10.5 11.1 11.2 11.3 Revision History Rev 0.01 1.00 1.01 1.02 1.03 1.04 Description Preliminary First Release Update Patent Numbers Update MOQ Updated Contact Info and Ref Design Updated temp rating to −20 °C Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 Date March 2012 June 2012 July 2014 March 2015 November 2016 September 2017 Page 3of 32 September 2017 IQ Switch® ProxSense® Series List of Symbols ATI BP CH CS CX EMI ESD FTB/EFT GND LP LTA ND NP OTP P PO prox RDY RF SCL SDA t THR TO VDDHI VREG Auto Tuning Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Boost Power Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Count(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 Sensor Electrode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electromagnetic Interference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Electro-Static Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 (Electrical) Fast Transient Bursts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Low Power Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Long Term Average . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 Noise Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Normal Power Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 One-time Programmable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Proximity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Proximity Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Proximity Event . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Ready . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Radio Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 I2 C Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 I2 C Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Touch Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Supply (input) Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Internal Regulator Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 Page 4of 32 September 2017 IQ Switch® ProxSense® Series 1 Functional Overview The IQS232 is a two channel capacitive proximity and touch sensor featuring an internal voltage regular and reference capacitor (Cs). The device has two dedicated input pins for the connection of the sense electrodes (CX). Two output pins for Touch (for each channel) detection and one output (PO) for proximity detection. The output pins can be configured as Logic outputs or in a serial data streaming option on TO0 (data) and TO1 (clock). The device automatically tracks slow varying environmental changes via various filters, detect noise and has an automatic Auto Tuning Implementation (ATI) to tune the device for optimal sensitivity. 1.1 Pin Outs GND CX1 CX0 TO1/SCL VDDHI TO0/SDA VREG PO0/RF/ RDY Figure 1.1: IQS232 pin-out. The IQS232 is pin compatible with the IQS132, but has different electrical characteristics. Refer to Section 10. Table 1.1: IQS232 Pin-outs Pin 1 2 3 4 5 6 7 8 Stand Alone GND CX0 VDDHI VREG PO/RF TO0 TO1 CX1 Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved Streaming GND CX0 VDDHI VREG RDY/RF SDA SCL CX1 IQS232 Datasheet Revision 1.04 Function Ground Sense Electrode Power Input Regulator Pin Proximity Output Touch Output Touch Output Sense Electrode Page 5of 32 September 2017 IQ Switch® ProxSense® Series 1.2 Applicability  Detection of PROX and TOUCH events. All specifications, except where specifically mentioned otherwise, provided by this datasheet are applicable to the following ranges:  Managing outputs of the device.  Managing serial communications.  Manage programming of OTP options.  Temperature −20 °C to +85 °C  Supply voltage (VDDHI) 1.8 V to 3.6 V 2 Analogue Functionality The analogue circuitry measures the capacitance of the sense electrodes attached to the Cx pins through a charge transfer process that is periodically initiated by the digital circuitry. The measuring process is referred to as a conversion and consists of the discharging of Cs and Cx, the charging of Cx and then a series of charge transfers from Cx to Cs until a trip voltage is reached. The number of charge transfers required to reach the trip voltage is referred to as the counts (CS). The capacitance measurement circuitry makes use of an internal CS and voltage reference (VREF ). The analogue circuitry further provides functionality for:  Power on reset (POR) detection.  Brown out detection (BOD). 3 Digital Functionality The digital processing functionality is responsible for:  Device configuration from OTP settings after POR.  Management of BOD and WDT events.  Initiation of conversions at the selected rate.  Processing of CS and execution of algorithms.  Monitoring and automatic execution of the ATI algorithm.  Signal processing and digital filtering. Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 Page 6of 32 September 2017 IQ Switch® ProxSense® Series 4 Reference Design VDDHI Optional 42R2 IQS232 3 4 C3 100pF VDDHI CX0 VREG CX1 1uF C4 C2 TO0/SDA 1uF TO1/SCL 1 GND R1 8 470R R2 VDDHI 2K0 R5 TO0 2K0 R6 2K0 R4 R3 PO 7 5 TO0 TO1 PO VDDHI VDDHI 2K0 PO0/RF&RDY 6 SO-8 GND GND TO1 470R C1 100pF VDDHI 2 2K0 R7 2K0 R8 TO0 SDA to MCU TO1 SCL to MCU PO RDY to MCU Figure 4.1: IQS232 Reference Design. 4.1 Power Supply and PCB Layout Azoteq IC’s provide a high level of on-chip hardware and software noise filtering and ESD protection (refer to Section 10). Designing PCB’s with better noise immunity against EMI, FTB and ESD in mind, it is always advisable to keep the critical noise suppression components like the de-coupling capacitors and series resistors in Figure 4.1 as close as possible to the IC. Always maintain a good ground connection and ground pour underneath the IC. For more guidelines please refer to the relevant application notes as mentioned in Section 4.2. Where a system level ESD strike is found to cause the IC to go into ESD induced latch-up, it is suggested that the supply current to the IQS232 IC is limited by means of a series resistor that could limit the maximum supply current to the IC to 1k may be required • Long Cx traces not ok • Use RF detection as last resort 1) Determine Prox, Touch & Data requirements 2) Choose Device Conducted RF AZD052 • Preferably use Rx of 470 • Filtering and grounding of supply very NB • Traces < 200mm ok What is the biggest EMC threat? Electro-Static Discharge Fast Transient Bursts • • • • AZD013 • Preferably use Rx of 470 • Rather use TVS than higher Rx to protect • Grounding of TVS NB AZD051 Rx > 1k may be required Long Cx traces ok Careful with Cx pad size Grounding very NB Figure 4.2: EMC Design Choices. Applicable application notes: AZD013, AZD015, AZD051, AZD052 Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 Page 8of 32 September 2017 IQ Switch® ProxSense® Series 5 Note AZD007: "AZD007 - USBProg Overview" High Sensitivity which can be found on the Azoteq website. Al- Through patented design and advanced signal ternate programming solutions of the IQS232 processing, the device is able to provide extremely also exist. For further enquiries regarding this high sensitivity to detect proximity. This enables matter please contact Azoteq at: designs to detect proximity at distances that can- ProxSenseSupport@azoteq.com or the local dis- not be equalled by most other products. When tributor. the device is used in environments where high levels of noise exist, a reduced proximity threshold is proposed to ensure reliable functioning of the sensor. When the capacitance between the sense electrode and ground becomes too large the sensitivity of the device may be influenced. For more guidelines on layout, please refer to Application Note AZD008, available on the Azoteq web page, visit: www.azoteq.com 6 User Configurable Options The IQS232 provides One Time Programmable (OTP) user options (each option can be modified only once). The IQS232 can enter streaming mode (I2 C debuging) at start-up where the OTP options can be set and evaluated through the memory map, refer to Section 14, before programming OTP setting for stand alone use. The device is fully functional in the default (unconfigured) state. OTP options are intended for specific applications. The configuration of the device can be done on packaged devices or incircuit. In-circuit configuration may be limited by values of external components chosen. 6.1 Configuring of Devices Azoteq offers a Configuration Tool (CT220 or later) and accompanying software (USBProg.exe) that can be used to program the OTP user options for prototyping purposes. More details regarding the configuration of the device with the USBProg program is explained by Application Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 Page 9of 32 September 2017 IQ Switch® ProxSense® Series Table 6.1: User Selectable Configuration Options: Bank 0 ATI bit 7 Sys Use Bank 0: bit 7 Bank 0: bit 6 Bank 0: bit 5 Bank 0: bit 4:2 Bank 0: bit 1:0 BASETCH TTHR 2 TTHR 1 Bank 0 TTHR 0 PTHR 1 ATI:ATI method 0 = Full 1 = Partial System Use BASETCH : ATI Base Value for Touch Channels 0 = 250 (Less Sensitive) 1 = 100 (More Sensitive) TTHR 2:TTHR 1: Touch Thresholds (CH2 independent) 000 = 4/64 001 = 1/64 (Most Sensitive) 010 = 2/64 011 = 8/64 100 = 12/64 101 = 16/64 110 = 24/64 111 = 32/64 (Least Sensitive) PTHR 1:PTHR 0: Proximity Threshold 00 = 4 01 = 2 (Most Sensitive) 10 = 8 11 = 16 (Least Sensitive) Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 PTHR 0 bit 0 Section 7.1 Section 7.2 Section 7.3 Section 7.4 Page 10of 32 September 2017 IQ Switch® ProxSense® Series Table 6.2: User Selectable Configuration Options: Bank 1 (Full ATI) t H ALT 1 bit 7 t H ALT 0 Bank 1: bit 7:6 Bank 1: bit 5 Bank 1: bit 4:2 Bank 1: bit 1:0 Sys Use TTHR 2 TTHR 1 Bank 1 - Full ATI TTHR 0 BASE1 t H ALT 1:t H ALT 0: Halt time of Long Term Average 00 = 20 seconds 01 = 40 seconds 10 = Never 11 = Always (Prox on 40) System Use CH2 TTHR 2:TTHR 0: Touch Thresholds on CH2 000 = 4/64 001 = 1/64 (Most Sensitive) 010 = 2/64 011 = 8/64 100 = 12/64 101 = 16/64 110 = 24/64 111 = 32/64 (Least Sensitive) BASE1:BASE0: Proximity (CH0) Base Value 00 = 200 (150 with BASESEL set to Alternative) 01 = 50 (350 with BASESEL set to Alternative) 10 = 100 (500 with BASESEL set to Alternative) 11 = 250 (700 with BASESEL set to Alternative) Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 BASE0 bit 0 Section 7.5 Section 7.3 Section 7.6 Page 11of 32 September 2017 IQ Switch® ProxSense® Series Table 6.3: User Selectable Configuration Options: Bank 1 (Partial ATI) t H ALT 1 bit 7 Bank 1: bit 7:6 Bank 1: bit 5:4 Bank 1: bit 3:0 t H ALT 0 MUL5 MUL4 MUL3 MUL2 Bank 1 - Partial ATI MUL1 t H ALT 1:t H ALT 0: Halt time of Long Term Average 00 = 20 seconds 01 = 40 seconds 10 = Never 11 = Always (Prox on 40) MUL5:MUL4: Sensitivity Multipliers 00 = Lowest 11 = Highest MUL3:MUL0: Base Multipliers 0000 = Lowest 1111 = Highest Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 MUL0 bit 0 Section 7.5 Section 7.7 Section 7.8 Page 12of 32 September 2017 IQ Switch® ProxSense® Series Table 6.4: User Selectable Configuration Options: Bank 2 BaseSEL bit 7 TFRQ STREAMING Bank 2: bit 7 Bank 2: bit 6 Bank 2: bit 5 Bank 2: bit 4 Bank 2: bit 3:2 Bank 2: bit 1 Bank 2: bit 0 ND PMODE1 Bank 2 PMODE0 BaseSEL : Base Select 0 = Default 1 = Alternative TFRQ : Charge Transfer Frequency 0 = 250kHz 1 = 1MHz STREAMING: 2-wire Streaming mode 0 = Disabled 1 = Enabled ND: Noise Detect 0 = Disabled 1 = Enabled PMODE1:PMODE0: Low Power Mode 00 =9ms (Boost Power Mode) 01 = 32ms (Normal Power Mode) 10 = 128ms (Low Power 1) 11 = 1s (Low Power 2) CX1 Block: Guard channel enable 0 = Disabled 1 = Enabled LOGIC: Output logic select 0 = Active Low (SW open drain) 1 = Active High Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 CX1 Block LOGIC bit 0 Section 7.9 Section 7.10 Section 7.11 Section 7.12 Section 7.13 Section 7.14 Section 7.15 Page 13of 32 September 2017 IQ Switch® ProxSense® Series Table 6.5: User Selectable Configuration Options: Bank 3 Sys Use bit 7 Sys Use Bank 3: bit 7:2 Bank 3: bit 1 Bank 3: bit 0 Sys Use Sys Use Sys Use Bank 3 Sys Use Delay Sys Use: System Use Delay: ATI Delay After Prox cleared 0 = 0 seconds 1 = 10 seconds Target: ATI Target Counts 0 = Proximity Channel - 1024; Touch Channels - 512 1 = Proximity Channel - 512; Touch Channels - 256 Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 Target bit 0 Section 7.16 Section 7.17 Page 14of 32 September 2017 IQ Switch® ProxSense® Series 7 Description of User Options This section describes the individual user programmable options of the IQS232 in more detail. Azoteq can supply pre-configured devices for large quantities. Thresholds and other settings can also be 7.3 The IQS232 has 8 touch threshold settings. The touch threshold is selected by the designer to obtain the desired touch sensitivity. The touch threshold is expressed as a fraction of the LTA as follows: evaluated in Test Mode streaming without programming the OTP options. TTH = SelectedValue × LTA For appropriate software, visit www.azoteq.com Touch Thresholds (7.1) Where LTA is the Long Term Average The touch event is triggered based on TTHR , CS and LTA. 7.1 A touch event is identified when for at least 2 ATI Method consecutive samples of the following equation The IQS232 can be setup to start in two ways; holds: TTHR =< LTA − CS Full ATI and Partial ATI. In Full ATI mode, the device automatically select the multipliers through the ATI algorithm to setup the IQS232 as close as possible to its default sensitivity for the environment where it was placed. The designer can, however, select Partial ATI, and set the multipliers to a pre configured value. This will cause the IQS232 to only calculate the compensation (not the compensation and multipliers as in Full ATI), which allows the freedom to make the IQS232 more or less sensitive for its intended environment of use. (7.2) With lower average CS (therefore lower LTA) values the touch threshold will be lower and vice versa. Changing the target counts of the touch channels, will also change the value of the LTA, which affect the counts required for a touch event. The Touch Threshold for CH0 & CH2 is set in Bank 0, while the Touch Threshold for CH1 is set in Bank 1 (when in full ATI-mode). This enables the designer to set the blocking channel’s touch threshold independently from the other two channels, when not using the Partial ATI feature. 7.2 Touch Base Values The IQS232 has the option to change the Base 7.4 Proximity Threshold Values of the touch channels during the ATI al- The IQS232 has 4 proximity threshold settings. gorithm. Depending on the application, this pro- The proximity threshold is selected by the de- vides the user with another option to select the signer to obtain the desired sensitivity and noise sensitivity of the touch channels (along with the immunity. touch thresholds, charge transfer frequency and based on the selected proximity threshold; the the target counts) without changes in the hard- CS and LTA (Long Term Average). The thresh- ware (CX sizes and routing, etc) The default old is expressed in terms of counts; the same Base Value 250, and can be set to 100 to in- as CS. For a proximity event, the CS (counts) of crease the sensitivity. The Base Value cannot the prox channel should fall the PTHR value be- be changed independently for each channel. low the LTA for at least 6 consecutive samples. Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 The proximity event is triggered Page 15of 32 September 2017 IQ Switch® ProxSense® Series 7.5 Halt time The Halt Timer is started when a proximity or touch event occurs and is restarted when an event is removed or reoccurs. When a proximity condition occurs on any of the channels, tion to select the sensitivity of the proximity detection without changes in the hardware (CX sizes and routing, etc). There are 4 available options, with another 4 options becoming available when the BASESEL bit is set to alternative. the LTA for that channel will be "halted", thus its value will be kept fixed, until the proximity event is cleared, or the halt timer reaches the halt time. The Halt timer will count to the selected Halt time (t H ALT ). If the timer expires, all outputs will be cleared. It is possible that the CS could be outside the ATI band (Target +- 160 or +- 80) when the timer expires, which will cause a re-ATI event. The designer needs to select a Halt Timer value to best accommodate the required application. 20 seconds The halt timer will halt for 20 sec- 7.7 Sensitivity Multipliers Sensitivity multipliers are added after the base value is selected through the base multipliers. If the sensitivity multipliers are selected high, the ATI algorithm could reach the target counts without adding any compensation, thus rendering the device less sensitive. For the same reasoning, setting the sensitivity multipliers low, will add more compensation, and increase the device sensitivity. onds after the last proximity or touch event. 40 seconds The halt timer will halt for 40 seconds after the last proximity or touch event. 7.8 Base Multipliers Base multipliers selects the base value of the ATI algorithm. Thus, if lower values are se- Never With the Never Halt option, the filter will lected, the algorithm needs to add more sen- not halt when any proximity or touch con- sitivity multipliers and compensation to reach dition occurs. This means the LTA will fol- the target counts, rendering the device more low the CS and an event will clear when sensitive. For the same reasoning, the device LTA reaches below the CS + threshold will be less sensitive when using higher base value. multipliers. Care should be taken when setting Always With the ’ALWAYS’ option, the detection of a proximity event will halt the LTA for only 40 seconds and with the detection of a touch event will halt the LTA for the base multipliers low, as setting them to low, could cause the algorithm not to reach the target. Not reaching the target impact the touch thresholds, as the are derived from the LTA. as long as the touch condition applies. 7.6 Proximity Base Value 7.9 Base Select The IQS232 has the option to change the Base The Base Select bit, changes the values of the Value of the distributed Proximity channel dur- proximity channel’s base value options. This al- ing the ATI algorithm. Depending on the appli- lows for a different range of available options, cation, this provides the user with another opas illustrated in Table 7.9. Copyright ©Azoteq (Pty) Ltd 2017 IQS232 Datasheet All rights reserved Revision 1.04 Page 16of 32 September 2017 IQ Switch® ProxSense® Series Design guidelines should however be followed Table 7.1: Distributed proximity channel’s base values. Base Select 1 200 150 50 350 100 500 250 700 layout:  A ground plane should be placed under the Base1:Base0 0 to ensure the best noise immunity. Notes for IC, except under the Cx lines  Place the sensor IC as close as possible to the sense electrodes.  All the tracks on the PCB must be kept as short as possible. 7.10 Charge Transfer Frequency  The capacitor between VDDHI and GND as The IQS232 has two available for the charge well as between VREG and GND must be transfer frequency. placed as close as possible to the IC. The default (512kHz) is more sensitive, while the 1MHz option allows for better immunity against false detection in applications where moisture could be present near the sense electrodes. The faster frequency is recommended for better stability and response rate in applications with very thin overlays.  A 100 pF capacitor can be placed in parallel with the 1uF capacitor between VDDHI and GND. Another 100 pF capacitor can be placed in parallel with the 1uF capacitor between VREG and GND.  When the device is too sensitive for a spe- 7.11 Streaming mode There is a streaming bit available that allows for serial data communication on the IQS232. Streaming is done via an I2 CTM compatible 3wire interface, which consist of a data (SDA), clock (SCL) and ready (RDY) line. The IQS232 can only function as a slave on the bus, and will only acknowledge on address 0x44H. The RDY line is to be used by the host controller as an indication of when to start communication to the cific application a parasitic capacitor (max 5pF) can be added between the CX line and ground.  Proper sense electrode and button design principles must be followed.  Unintentional coupling of sense electrode to ground and other circuitry must be limited by increasing the distance to these sources. device. The RDY line will be low when it is ready  In some instances a ground plane some for communication, and it will high when it is do- distance from the device and sense elec- ing conversions. The IQS232 will not ack on its trode may provide significant shielding address while the RDY line is high (thus while from undesirable interference. the IQS232 is doing conversions). 7.12 Noise Detect However, if interference from RF noise sources persist after proper layout, see Application NoteAZD015, the IQS232 has a noise detect The IQS232 has advanced immunity to RF function which will detect RF noise and block noise sources such as GSM cellular tele- outputs from the device. Different antenna lay- phones, DECT, Bluetooth and WIFI devices. outs can be used on the RF detect pin (pin Copyright ©Azoteq (Pty) Ltd 2017 IQS232 Datasheet Page 17of 32 All rights reserved Revision 1.04 September 2017 IQ Switch® ProxSense® Series 6) and more details can be found in Aplication Note AZD015. 7.13 Low Power Mode The IQS232 IC has four power modes specifically designed to reduce current consumption for battery applications. The power modes are implemented around the occurrence of charge cycle every tSAMPLE seconds (refer to Table 7.2). Lower sampling frequencies yield lower power consumption (but decreased response time). During normal operation charge cycles are initiated approximately every 32ms. This is referred to as Normal Power Mode (NP). The IQS232 by default, (before programming OTP options for power modes) charges in Boost Power Mode (9ms). The timings for all the Power Modes are provided in the table below. While in any power mode the device will zoom to BP whenever a sampled count indicates a possible proximity or touch event. This improves the response time. The device will remain in BP for tZOOM and then return to the selected power mode if no further events are detected. The Zoom function allows reliable detection of events with counts being produced at the BP rate. The time, tZOOM , is 5 seconds, however, the timer will restart upon undebounced events. This could make the time, tZOOM , apear longer in noisy environments. Table 7.2: IQS232 Low Power Mode Timings Power Mode tBP (default) t NP t LP1 t LP2 tSAMPLE (ms) 9 32 128 1000 Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 Page 18of 32 September 2017 IQ Switch® ProxSense® Series Figure 7.1: LP Modes: Charge cycles. 7.14 Guard Channel able, which will also increase the response rate. Therefore, the ATI Target bit can be set, chang- When the guard channel (or blocking channel) ing the targets to 500 for the proximity channel, is enabled, the other touch outputs from the de- and 250 for the touch channels. vice are blocked when a touch condition is detected on CH1 (CH1’s touch output is still active). This can prevent accidental activation when picking up a product, or give a blocking function against water or other environmental factors. 7.15 Output Logic Select The IQS232 can be set to sink or source current in stand-alone mode, by setting the logic output active high or active low. For characterisation data, please refer to Table 10.3. When used in Active Low mode, the I/O’s are defined as software open drain, and requires a 10k pull up resistor to VDDHI. 7.16 ATI Delay The IQS232 allows an ATI delay option of 0 seconds (immediately) or 10 seconds after the Proximity output is cleared (and the countss are not within the allowed ATI band). 7.17 ATI Target The default target counts of the IQS232 are 1000 for the proximity channel, and 500 for the touch channels. However, for some application, a less sensitive and lower target is acceptCopyright ©Azoteq (Pty) Ltd 2017 IQS232 Datasheet All rights reserved Revision 1.04 Page 19of 32 September 2017 IQ Switch® ProxSense® Series 8 Charge Transfers The IQS232 samples in 3 time slots, with one internal CS capacitor. The charge sequence is shown in 8.1, where CH0 is the Proximity channel, and charges before each of the 2 touch channels. The proximity channel is realised by connecting both sense electrodes with internal switches. Therefore: CH0 is a distributed electrode formed by the 2 touch electrodes. CH0 PROX CH1 + CH2 CH1 CX0 0 CH2 CX1 0 CH1 CX0 Figure 8.1: Charge Transfer for IQS232. Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 Page 20of 32 September 2017 IQ Switch® ProxSense® Series 9 Auto Tuning Implementation ATI is a sophisticated technology implemented ® in all but the first generation ProxSense de- vices that optimises the performance of the sensor in a wide range of applications and environmental conditions refer to Application Note AZD027, AZD027 - Auto Tuning Implementation. ATI makes adjustments through internal trode (within the maximum range of the device). The effects of auto-ATI on the application are the following:  Automatic adjustment of the device configuration and processing parameters for a wide range of PCB and application designs to maintain an optimal configuration for proximity and touch detection. reference capacitors to obtain optimum perfor-  Automatic tuning of the sense electrodes at mance. ATI adjusts internal circuitry according start-up to optimise the sensitivity of the to two parameters, the ATI multipliers and the application. ATI compensation. The ATI multiplier can be viewed as a course adjustment and the ATI compensation as a fine adjustment. The adjustment of the ATI parameters will result in variations in the counts and sensitivity. Sensitivity can be observed as the change in counts as the result of  Automatic re-tuning when the device detects changes in the sensing electrodes capacitance to accommodate a large range of changes in the environment of the application that influences the sense electrodes. a fixed change in sensed capacitance. The ATI  Re-tuning only occurs during device opera- parameters have been chosen to provide signifi- tion when a relatively large sensitivity re- cant overlap. It may therefore be possible to se- duction is detected. This is to ensure smooth lect various combinations of ATI multiplier and operation of the device during operation. ATI compensation settings to obtain the same counts. The sensitivity of the various options may however be different for the same counts.  Re-tuning may temporarily influences the normal functioning of the device, but in most instances the effect will be hardly notice- 9.1 able. Full ATI The IQS232 implements an automatic ATI algorithm. This algorithm automatically adjusts the ATI parameters to optimise the sense electrodes connection to the device. The device will execute the ATI algorithm whenever the device starts-up and when the counts are not within a predetermined range. While the Automatic ATI  Shortly after the completion of the re-tuning process the sensitivity of Proximity detection may be reduced slightly for a few seconds as internal filters stabilises. Automatic ATI can be implemented so effectively due to:  Excellent system signal to noise ratio (SNR). algorithm is in progress this condition will be indicated in the streaming data and proximity and touch events cannot be detected. The device will only briefly remain in this condition and it will be entered only when relatively large shifts in the counts has been detected. The automatic ATI function aims to keep the counts constant,  Effective digital signal processing to remove AC and other noise.  The very stable core of the devices.  The built in capability to accommodate a large range of sense electrodes capacitance. regardless of the capacitance of the sense elecCopyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 Page 21of 32 September 2017 IQ Switch® ProxSense® Series 9.2 Partial ATI If the ATI Select bit is set to Partial ATI, the touch threshold for CH2 is the same as for CH1 (see Section 7.1, CH2’s touch threshold is now also set in Bank 0). If the ATI bit is not set (default), CH2 has its own touch threshold. The same applies to the Proximity channel’s base value, which is not set in the first two bits of Bank 1 anymore. Instead, the first 5 bits of Bank 1, changes to Multiplier bits (both Sensitivity and Compensation). Setting the partial ATI bit is useful for production devices (after prototyping has revealed the correct setup) as it decreases the start-up time of the IC, since the full ATI algorithm is not implemented at from a cold-start. Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 Page 22of 32 September 2017 IQ Switch® ProxSense® Series 10 Specifications Absolute Maximum Specifications The following absolute maximum parameters are specified for the device: Exceeding these maximum specifications may cause damage to the device.         Operating temperature Supply Voltage (VDDHI - GND) Maximum pin voltage Maximum continuous current (for specific Pins) Minimum pin voltage Minimum power-on slope ESD protection Moisture Sensitivity Level −20 °C to +85 °C 3.6 V VDDHI + 0.5 V 2 mA GND - 0.5 V 100 V /s ±4 kV MSL 3 Table 10.1: IQS232 General Operating Conditions Description Supply voltage Internal regulator output Boost operating current Normal operating current Low power operating current Low power operating current Condition 1.8 ≤ VDDHI ≤ 3.3 1.8 ≤ VDDHI ≤ 3.3 1.8 ≤ VDDHI ≤ 3.3 1.8 ≤ VDDHI ≤ 3.3 1.8 ≤ VDDHI ≤ 3.3 Parameter VDDHI VREG I IQS232BP I IQS232NP I IQS232LP1 I IQS232LP2 MIN 1.8 1.62 TYP MAX 3.6 1.79 1.7 148 80 18 3.5 Unit V V µA µA µA µA Table 10.2: Start-up and shut-down slope Characteristics Description POR BOD Condition VDDHI Slope ≥ 100 V/s Parameter POR BOD MIN 1.2 1.15 MAX 1.6 1.55 Unit V V Table 10.3: POUT and TOUT Characteristics for each I/O Symbol Description Conditions ISOURCE UNIT VOH Output High voltage VDDHI = 3.3V 5 mA Symbol Description Conditions ISI NK UNIT VOL Output Low voltage VDDHI = 3.3V 10 mA Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 Page 23of 32 September 2017 IQ Switch® ProxSense® Series Table 10.4: Initial Touch Times Description BP NP LP1 LP2 Parameter Report Rate Report Rate Report Rate Report Rate MIN 20 63 63 63 MAX 61 120 216 1088 Unit ms ms ms ms Table 10.5: Repetitive Touch Rates DESCRIPTION Sample rate Response Rate UNIT All power modes 5ms > 15 Touches/second All power modes 9ms >8 Touches/second Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 Page 24of 32 September 2017 IQ Switch® ProxSense® Series Mechanical Dimensions         11 Figure 11.1: SO 8 Package. Table 11.1: SO-8 Package Dimensions. Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved Dimension [mm] Amin 3.75 Amax 4.15 Bmin 4.73 Bmax 5.13 Hmax 1.80 Lmin 5.70 Lmax 6.30 Tmin 0.30 Tmax 0.70 Pitch 1.27 Wmin 0.31 Wmax 0.51 IQS232 Datasheet Revision 1.04 Page 25of 32 September 2017 IQ Switch®            ProxSense® Series Figure 11.2: SO 8 Footprint. Table 11.2: SO 8 Footprint Dimensions mm 1.27 5.40 1.55 0.60   Dimension Pitch C Y X Figure 11.3: SO 8 Silk Screen. Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 Page 26of 32 September 2017 IQ Switch® ProxSense® Series Table 11.3: SO-8 Silk Screen Dimensions Dimension R1 R2 Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved mm 3.20 4.90 IQS232 Datasheet Revision 1.04 Page 27of 32 September 2017 IQ Switch® ProxSense® Series 12 Device Marking x t REVISION TEMPERATURE RANGE IC CONFIGURATION DATE CODE 13 zzzzzzzz P WW YY = = = = = = = IC Revision Number I −20 °C to 85 °C (Industrial) C 0 °C to 70 °C (Commercial) Configuration (Hexadecimal) Package House WEEK YEAR Ordering Information Orders will be subject to a MOQ (Minimum Order Quantity) of a full reel. Contact the official distributor for sample quantities. A list of the distributors can be found under the "Distributors" section of www.azoteq.com. For large orders, Azoteq can provide pre-configured devices. The Part-number can be generated by using USBProg.exe or the Interactive Part Number generator on the website. IC NAME CONFIGURATION PACKAGE TYPE BULK PACKAGING Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 zzzzzzzz SO R = = = = IQS232 IC Configuration (hexadecimal) SO-8 Reel (2500pcs/reel) - MOQ = 2500pcs IQS232 Datasheet Revision 1.04 Page 28of 32 September 2017 IQ Switch® ProxSense® Series 14 Memory Map Product Number 00H Bit 7 6 5 4 3 1 0 0x1F R Version Number R/W Bit 7 6 5 4 3 2 1 0 Version Number 0x09 R System Flags R/W Default 10H 2 Product Number Default 01H R/W Bit 7 6 5 4 System Use 3 2 1 0 LP ATI Busy ND Zoom 0 0 0 Default Proximity Channels 31H Bit 7 6 5 4 3 Default R/W 2 1 0 CH2 CH1 CH0 0 0 0 Touch Channels 35H Bit 7 Default Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved 6 5 4 3 R R/W 2 1 0 CH2 CH1 CH0 0 0 0 IQS232 Datasheet Revision 1.04 R R Page 29of 32 September 2017 IQ Switch® ProxSense® Series System Use 36H Bit 7 6 5 4 3 Bit 7 6 5 Bit 7 6 5 1 0 R System Use R/W 4 3 4 2 1 0 0 R Filter Halt R/W Default 39H 2 0 Default 37H R/W 3 Default 2 1 0 CH2 CH1 CH0 0 0 0 Channel Number 3DH Bit 7 6 5 Bit 7 6 3 2 R/W 1 0 Current Channel R Current Sample (CS) R/W Default 42H 4 5 4 3 2 1 0 High Byte R Default Counts (CS) 43H R Bit 7 6 5 4 3 2 R/W 1 0 Low Byte R Default Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 Page 30of 32 September 2017 IQ Switch® ProxSense® Series Long Term Average (LTA) 83H Bit 7 6 5 4 3 2 1 0 High Byte R Default Long Term Average (LTA) 84H Bit 7 6 5 4 3 2 1 Low Byte R OTP Bank 0 Bit 7 6 5 4 3 2 R/W 1 0 Details in Table \ref R/W Default OTP Bank 1 C5H Bit 7 6 5 4 3 2 R/W 1 0 Details in Table \ref R/W Default OTP Bank 2 C6H Bit 7 6 5 4 3 2 R/W 1 0 Details in Table \ref R/W Default OTP Bank 3 C7H R/W 0 Default C4H R/W Bit 7 6 5 4 3 2 R/W 1 0 Details in Table \ref R/W Default Copyright ©Azoteq (Pty) Ltd 2017 All rights reserved IQS232 Datasheet Revision 1.04 Page 31of 32 September 2017 IQ Switch® ProxSense® Series Azoteq USA Asia South Africa Physical Address 11940 Jollyville Suite 120-S Austin TX 78750 USA Room 501A, Block A, T-Share International Centre, Taoyuan Road, Nanshan District, Shenzhen, Guangdong, PRC 1 Bergsig Avenue Paarl 7646 South Africa Postal Address 11940 Jollyville Suite 120-S Austin TX 78750 USA Room 501A, Block A, T-Share International Centre, Taoyuan Road, Nanshan District, Shenzhen, Guangdong, PRC PO Box 3534 Paarl 7620 South Africa Tel +1 512 538 1995 +86 755 8303 5294 ext 808 +27 21 863 0033 Email info@azoteq.com info@azoteq.com info@azoteq.com Visit www.azoteq.com for a list of distributors and worldwide representation. Patents as listed on www.azoteq.com/patents-trademarks/ may relate to the device or usage of the device. Azoteq®, Crystal Driver , IQ Switch®, ProxSense®, ProxFusion®, LightSense™, SwipeSwitch™, and the logo are trademarks of Azoteq. The information in this Datasheet is believed to be accurate at the time of publication. Azoteq uses reasonable effort to maintain the information up-to-date and accurate, but does not warrant the accuracy, completeness or reliability of the information contained herein. All content and information are provided on an “as is” basis only, without any representations or warranties, express or implied, of any kind, including representations about the suitability of these products or informat ion for any purpose. Azoteq disclaims all warranties and conditions with regard to these products and information, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property rights. Azoteq assumes no liability for any damages or injury arising from any use of the information or the product o r caused by, without limitation, failure of performance, error, omission, interruption, defect, delay in operation or transmiss ion, even if Azoteq has been advised of the possibility of such damages. The applications mentioned herein are used solely for the purpose of illustration and Azoteq makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction o r otherwise. Azoteq products are not authorized for use as critical components in life support devices or systems. No licenses to patents are granted, implicitly, express or implied, by estoppel or otherwise, under any intellectual property rights. In the event that any of the abovementioned limitations or exclusions does not apply , it is agreed that Azoteq’s total liability for all losses, damages and causes of action (in contract, tort (including without limitation, negligence) or otherwise) will not exceed the amount already paid by the customer for the products. Azoteq reserves the right to alter its products, to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and information, its products, programs and services at any time or to move or discontinue any contents, products, programs or services without pr ior notification. For the most up-to-date information and binding Terms and Conditions please refer to www.azoteq.com. Copyright © Azoteq (Pty) Ltd 2019. All Rights Reserved. info@azoteq.com IQS5xx-B000 Datasheet Revision 2.1 Page 1 of 1 March 2021