IQS6624-300DNR [ETC]
Hall effect angle sensor:On-chip Hall plates;
| 型号： | IQS6624-300DNR |
| 厂家： | 
ETC |
| 描述： | Hall effect angle sensor:On-chip Hall plates |
| 文件： | 总62页 (文件大小：2806K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
IQ Switch®
ProxFusion™ Series
IQS624 Datasheet
Combination sensor including: Hall-effect rotation sensing, along with dual-channel
capactive proximity/touch sensing, or single-channel inductive sensing.
The IQS624 ProxFusion™ IC is a multifunctional capacitive and Hall-effect sensor designed for
applications where any or all of the technologies may be required. The two Hall-effect sensors
calculate the angle of a magnet rotating parallel with the sensor. The sensor is fully I2C compatible
and on-chip calculations enable the IC to stream the current angle of the magnet without extra
calculations.
Features
Inductive sensing
Hall effect angle sensor:
o Only external sense
coil required (PCB
trace)
o On-chip Hall plates
o 360° Output
o 1° Resolution, calculated on chip
o Relative rotation angle.
o Detect movement and the direction of
Multiple integrated UI
o Proximity / Touch
o Proximity wake-up
o Event mode
DFN10
movement.
o Raw data: can be used to calculate
Representations
only, not actual
markings
o QRD (Quick release detection)
o Wake Hall sensing on proximity
Minimal external components
Standard I2C interface
Optional RDY indication for event mode
operation
degrees on external processor.
o Operational range 10mT – 100mT
o No external components required
Partial auto calibration:
o Continuous auto-calibration,
compensation for wear or small
displacements of the sensor or magnet.
o Flexible gain control
o Automatic Tuning Implementation (ATI)
– Performance enhancement (10 bit).
Low power consumption:
240uA (100Hz response, Hall),
55uA (100Hz response, capacitive),
65uA (20Hz response, Hall)
15uA (20Hz response, capacitive)
5uA (5Hz response, capacitive)
Capacitive sensing
o Full
auto-tuning
with
adjustable
sensitivity
Supply Voltage: 1.8V to 3.6V*
o 2pF to 200pF external capacitive load
*5V solution available on demand.
capability
Applications
Anemometer
Dial or Selector knob
Mouse wheel
Measuring wheel
Digital angle gauge
Speedometer for bicycle
Available Packages
TA
DFN(3x3)-10
IQS624-xyy
-40°C to 85°C
Copyright © Azoteq 2016
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IQS624 Datasheet v1.12
Page 1 of 62
January 2017
IQ Switch®
ProxFusion™ Series
Contents
LIST OF ABBREVIATIONS............................................................................................................................................. 5
1
INTRODUCTION.................................................................................................................................................. 6
1.1
1.2
PROXFUSION...................................................................................................................................................... 6
PACKAGING AND PIN-OUT ....................................................................................................................................... 6
FIGURE 1.1
TABLE 1.1
PIN OUT OF IQS624 DFN(3X3)-10 PACKAGE.................................................................................................... 6
IQS624 PIN-OUT.......................................................................................................................................... 6
1.3
REFERENCE SCHEMATIC ........................................................................................................................................... 6
FIGURE 1.2 IQS624 REFERENCE SCHEMATIC....................................................................................................................... 6
SENSOR CHANNEL COMBINATIONS ............................................................................................................................. 7
TABLE 1.2 SENSOR - CHANNEL ALLOCATION....................................................................................................................... 7
1.4
2
CAPACITIVE SENSING ......................................................................................................................................... 8
2.1
2.2
TABLE 2.1
2.3 HARDWARE CONFIGURATION.................................................................................................................................... 9
TABLE 2.2 CAPACITIVE HARDWARE DESCRIPTION ................................................................................................................ 9
2.4 REGISTER CONFIGURATION....................................................................................................................................... 9
2.4.1 Registers to configure for the Capacitive sensing: ........................................................................................ 9
INTRODUCTION...................................................................................................................................................... 8
CHANNEL SPECIFICATIONS ........................................................................................................................................ 8
CAPACITIVE SENSING - CHANNEL ALLOCATION...................................................................................................... 8
TABLE 2.3
CAPACITIVE SENSING SETTINGS REGISTERS .......................................................................................................... 9
2.4.2 Registers to configure for the Small User interaction UI:............................................................................ 10
TABLE 2.4
SMALL USER INTERACTION UI SETTINGS REGISTERS ............................................................................................ 10
2.4.3 Example code:............................................................................................................................................. 10
2.5
SENSOR DATA OUTPUT AND FLAGS........................................................................................................................... 11
3
4
5
INDUCTIVE SENSING..........................................................................................................................................12
3.1
INTRODUCTION TO INDUCTIVE SENSING..................................................................................................................... 12
CHANNEL SPECIFICATIONS ...................................................................................................................................... 12
Mutual inductive sensor – channel allocation.................................................................................... 12
HARDWARE CONFIGURATION.................................................................................................................................. 12
Mutual inductive hardware description ............................................................................................. 12
REGISTER CONFIGURATION..................................................................................................................................... 13
3.2
3.3
3.4
Table 3.1
Table 3.2
TABLE 3.3
INDUCTIVE SENSING SETTINGS REGISTERS.......................................................................................................... 13
3.4.2 Example code:............................................................................................................................................. 13
HALL-EFFECT SENSING.......................................................................................................................................14
4.1
4.2
TABLE 4.1
INTRODUCTION TO HALL-EFFECT SENSING ................................................................................................................. 14
CHANNEL SPECIFICATIONS ...................................................................................................................................... 14
HALL-EFFECT SENSOR – CHANNEL ALLOCATION .................................................................................................. 14
4.3
4.4
HARDWARE CONFIGURATION.................................................................................................................................. 15
REGISTER CONFIGURATION..................................................................................................................................... 15
TABLE 4.2
HALL SENSING SETTINGS REGISTERS ................................................................................................................. 15
4.4.2 Example code:............................................................................................................................................. 16
4.5
SENSOR DATA OUTPUT AND FLAGS........................................................................................................................... 16
DEVICE CLOCK, POWER MANAGEMENT AND MODE OPERATION......................................................................17
5.1
5.2
DEVICE MAIN OSCILLATOR...................................................................................................................................... 17
DEVICE MODES .................................................................................................................................................... 17
5.2.1 Normal mode .............................................................................................................................................. 17
5.2.2 Low power mode......................................................................................................................................... 17
5.2.3 Ultra-low power mode................................................................................................................................ 17
5.2.4 Halt mode ................................................................................................................................................... 18
5.2.5 Mode time................................................................................................................................................... 18
5.3
STREAMING AND EVENT MODE:............................................................................................................................... 18
5.3.1 Streaming mode.......................................................................................................................................... 18
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January 2017
IQ Switch®
ProxFusion™ Series
5.3.2 Event mode ................................................................................................................................................. 18
5.4
REPORT RATES ..................................................................................................................................................... 18
5.4.1 Calculation of each mode’s report rate....................................................................................................... 18
5.5
SYSTEM RESET ..................................................................................................................................................... 18
6
7
COMMUNICATION ............................................................................................................................................19
6.1
I2C MODULE SPECIFICATION.................................................................................................................................... 19
DEVICE ADDRESS AND SUB-ADDRESSES ..................................................................................................................... 19
ADDITIONAL OTP OPTIONS .................................................................................................................................... 19
RECOMMENDED COMMUNICATION AND RUNTIME FLOW DIAGRAM................................................................................ 20
6.2
6.3
6.4
FIGURE 6.1
MASTER COMMAND STRUCTURE AND RUNTIME EVENT HANDLING FLOW DIAGRAM................................................... 20
IQS624 MEMORY MAP ......................................................................................................................................21
TABLE 7.1
7.2
: IQS624 REGISTER MAP .............................................................................................................................. 21
MEMORY REGISTERS DESCRIPTION .......................................................................................................................... 23
7.2.1 Device Information...................................................................................................................................... 23
7.2.2 Device Specific Data.................................................................................................................................... 24
7.2.3 Count Data.................................................................................................................................................. 26
7.2.4 Touch / Proximity sensor settings ............................................................................................................... 27
7.2.5 Touch / Proximity UI settings ...................................................................................................................... 30
7.2.6 Small User interaction detection................................................................................................................. 31
7.2.7 HALL Sensor Settings................................................................................................................................... 32
7.2.8 HALL Wheel Output..................................................................................................................................... 35
7.2.9 Device and Power Mode Settings................................................................................................................ 37
8
ELECTRICAL CHARACTERISTICS ..........................................................................................................................41
8.1
TABLE 8.1
8.2
TABLE 8.2
8.3 CURRENT CONSUMPTIONS ..................................................................................................................................... 42
8.3.1 IC subsystems.............................................................................................................................................. 42
ABSOLUTE MAXIMUM SPECIFICATIONS..................................................................................................................... 41
ABSOLUTE MAXIMUM SPECIFICATION .............................................................................................................. 41
POWER ON-RESET/BROWN OUT ............................................................................................................................. 41
POWER ON-RESET AND BROWN OUT DETECTION SPECIFICATIONS .......................................................................... 41
TABLE 8.3
TABLE 8.4
IC SUBSYSTEM CURRENT CONSUMPTION........................................................................................................... 42
IC SUBSYSTEM TYPICAL TIMING....................................................................................................................... 42
8.3.2 Capacitive sensing alone............................................................................................................................. 42
TABLE 8.5
CAPACITIVE SENSING CURRENT CONSUMPTION .................................................................................................. 42
8.3.3 Hall-effect sensing alone............................................................................................................................. 43
TABLE 8.6
HALL-EFFECT CURRENT CONSUMPTION ............................................................................................................ 43
8.3.4 Halt mode ................................................................................................................................................... 43
TABLE 8.7
8.4
8.5
HALT MODE CURRENT CONSUMPTION.............................................................................................................. 43
CAPACITIVE LOADING LIMITS................................................................................................................................... 43
HALL-EFFECT MEASUREMENT LIMITS ........................................................................................................................ 43
9
PACKAGE INFORMATION ..................................................................................................................................44
9.1 DFN10 PACKAGE AND FOOTPRINT SPECIFICATIONS..................................................................................................... 44
TABLE 9.1
TABLE 9.2
TABLE 9.3
FIGURE 9.1
FIGURE 9.2
FIGURE 9.3
DFN-10 PACKAGE DIMENSIONS (BOTTOM)...................................................................................................... 44
DFN-10 PACKAGE DIMENSIONS (SIDE)............................................................................................................ 44
DFN-10 LANDING DIMENSIONS ..................................................................................................................... 44
DFN-10 PACKAGE DIMENSIONS (BOTTOM). NOTE THAT THE SADDLE NEED TO BE CONNECTED TO GND ON THE PCB..... 44
DFN-10 PACKAGE DIMENSIONS (SIDE)............................................................................................................ 44
DFN-10 LANDING DIMENSION....................................................................................................................... 44
9.2
DEVICE MARKING AND ORDERING INFORMATION ........................................................................................................ 45
9.2.1 Device marking: .......................................................................................................................................... 45
9.2.2 Ordering Information:................................................................................................................................. 45
9.3
9.4
TAPE AND REEL SPECIFICATION ................................................................................................................................ 46
MSL LEVEL ......................................................................................................................................................... 47
10 DATASHEET REVISIONS .....................................................................................................................................48
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IQ Switch®
ProxFusion™ Series
10.1
10.2
REVISION HISTORY ................................................................................................................................................ 48
ERRATA.............................................................................................................................................................. 48
11 CONTACT INFORMATION ..................................................................................................................................49
12 APPENDICES ......................................................................................................................................................50
12.1
APPENDIX A: MAGNET ORIENTATION AND CALIBRATION .............................................................................................. 50
HALL ATI......................................................................................................................................................................... 61
HALL REFERENCE VALUE:..................................................................................................................................................... 61
ATI PARAMETERS:............................................................................................................................................................. 61
Coarse and Fine multipliers:..................................................................................................................................... 61
ATI-Compensation:................................................................................................................................................... 61
RECOMMENDED PARAMETERS: ............................................................................................................................................ 62
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IQS624 Datasheet v1.12
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January 2017
IQ Switch®
ProxFusion™ Series
List of abbreviations
PXS – ProxSense®
ATI – Automatic Tuning Implementation
LTA – Long term average
Thr – Threshold
UI – User interface
AC – Alternating current
DSP – Digital signal processing
RX – Receiving electrode
TX – Transmitting electrode
CS – Sampling capacitor
C – Capacitive
NP – Normal power
LP – Low power
ULP – Ultra low power
SUID – Small user interaction detection
QRD – Quick release detection
ACK – I2C Acknowledge condition
NACK – I2C Not Acknowledge condition
FG – Floating gate
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IQS624 Datasheet v1.12
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January 2017
IQ Switch®
ProxFusion™ Series
1 Introduction
1.1 ProxFusion
The ProxFusion sensor series provide all the proven ProxSense® engine capabilities with
additional sensors types. A combined sensor solution is available within a single platform.
1.2 Packaging and Pin-Out
SDA
RDY
VSS
NC
IQS624
VDDH
SCL
RX1
VREG
LTX
RX0
Figure 1.1 Pin out of IQS624 DFN(3X3)-10 package.
Table 1.1
IQS624 Pin-out
IQS624 Pin-out
Pin
1
Name
SDA
Type
Digital Input / Output
Digital Output
Function
I2C: SDA Output
I2C: RDY Output
2
RDY
3
VDDHI
Supply Input
Supply Voltage Input
Internal Regulator Pin (Connect 1µF bypass
capacitor)
4
VREG
Regulator Output
5
6
7
8
9
LTX
RX0
RX1
SCL
NC
Analogue
Transmit Electrode 1
Sense Electrode 0
Analogue
Analogue
Sense Electrode 1/ Transmit Electrode 0
I2C: SCL Output
Digital Input / Output
Not connect
Supply Input
Not connect
10 VSS
Ground Reference
1.3 Reference schematic
Figure 1.2
IQS624 reference schematic
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IQ Switch®
ProxFusion™ Series
1.4 Sensor channel combinations
The table below summarizes the IQS624’s sensor and channel associations.
Table 1.2
Sensor - channel allocation
Sensor type
CH0
CH1
CH2
CH3
CH4
CH5
Discreet Self
Capacitive
o
o
Small User
interaction
detection UI
Main
Movement
Hall effect rotary
UI
1st plate
1st plate
2nd plate
Positive
2nd plate
Negative
Positive Negative
Mutual inductive
o
o
Key:
o Optional implementation
Fixed use for UI
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IQ Switch®
ProxFusion™ Series
2 Capacitive sensing
2.1 Introduction
Building on the previous successes from the ProxSense® range of capacitive sensors, the same
fundamental sensor engine has been implemented in the ProxFusion series.
The capacitive sensing capabilities of the IQS624 include:
Maximum of 2 capacitive channels to be individually configured.
o Prox and touch adjustable thresholds
o Individual sensitivity setups
o Alternative ATI modes
Small user interaction detection user interface:
o Movement sensing to distinguish between stationary in-contact objects and human
interference
o Quick release feature
Discreet button UI:
o Fully configurable 2 level threshold setup – traditional prox & touch activation levels.
o Customizable filter halt time
2.2 Channel specifications
The IQS624 provides a maximum of 2 channels available to be configured for capacitive sensing.
Each channel can be setup separately per the channel’s associated settings registers.
There are two distinct capacitive user interfaces available to be used.
a) Discreet proximity/touch UI (always enabled)
b) Small user interaction UI
When the Small User interaction UI is activated (ProxSense / Capacitive Sensing Settngs4: bit7):
Channel 0 is used as the main capacitive sensing channel.
Channel 1 is used for capacitive movement detection. This is used to implement the quick
release detection.
Table 2.1
Capacitive sensing - channel allocation
Sensor type
CH0
CH1
CH2
CH3
CH4
CH5
Discreet Self
Capacitive
o
o
Small user
interaction
detection
Main
Movement
Key:
Optional implementation
o Optional implementation
Fixed use for UI
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IQ Switch®
ProxFusion™ Series
2.3 Hardware configuration
In the table below are multiple options of configuring sensing (Rx).
Table 2.2
Capacitive hardware description
Self-capacitive configuration
1 button
IQS624
LTX
RX0
2
buttons
IQS624
LTX
RX0
2.4 Register configuration
2.4.1 Registers to configure for the Capacitive sensing:
Table 2.3
Name
Capacitive sensing settings registers
Address
Description
Recommended setting
ProxSense / Capacitive Sensor
mode
and Sensor mode should be set
Sensing Setting 0
configuration of each to capacitive mode
channel.
0x40, 0x41
An appropriate RX should be
chosen and no TX
ProxSense / Capacitive Global settings for the None
Sensing Setting 1 ProxSense sensors
0x42
ProxSense / Capacitive ATI
settings
for ATI target should be more
than ATI base to achieve an
ATI
0x43, 0x44 Sensing Setting 2
ProxSense sensors
ProxSense / Capacitive Additional
Global SUID should be enabled for
0x45
Sensing Setting 3
Proximity threshold
Touch threshold
settings for ProxSense SUID UI
sensors
Proximity Threshold for Preferably more than touch
0x50, 0x52
0x51, 0x53
UI
threshold
Touch Threshold for UI
None
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IQ Switch®
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2.4.2 Registers to configure for the Small User interaction UI:
Table 2.4
Small User interaction UI settings registers
Name Description
Address
0x60
Small user interaction detection Setting 0 Filter settings
0x61
Small user interaction detection Setting 1 Timeout and threshold settings
0x62
Release Threshold
Release Threshold
Small user interaction detection Proximity Proximity Threshold
threshold
0x63
Small user interaction detection Touch Touch Threshold
threshold
0x64
0x65
Halt timer
SUID Halt timer
2.4.3 Example code:
Example code for an Arduino Uno can be downloaded at:
www.azoteq.com//images/stories/software/IQS62x_Demo.zip
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IQ Switch®
ProxFusion™ Series
2.5 Sensor data output and flags
The following registers should be monitored by the master to detect capacitive sensor output and
SUID activations.
a) The UI Flags register (0x11) will show the IQS624’s main events. Bit0&1 is dedicated to
the ProxSense activations, bit0 indicates a proximity event and bit1 indicates a touch event.
Bit2 is provided to indicate if the Small User interaction detection UI is activated.
UI Flags(0x11)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read
Small User
PXS
PXS
interaction Touch proximity
detection out out
b) The Proximity/Touch UI Flags (0x12) and Small User interaction detection UI Flags
(0x13) provide more detail regarding the outputs. A proximity and touch output bit for each
channel 0 and 1 is provided in the PRX UI Flags register.
c) The Small User interaction detection UI Flags (0x13) register will show detail regarding
the state of the small user interaction output as well as Quick release toggles, movement
activations and the state of the filter (halted or not).
Proximity/Touch UI Flags (0x12)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read
Chan 1 Chan 0
Chan 1
Chan 0
Touch
out
touch
out
proximity proximity
out
out
Small User interaction detection UI Flags (0x13)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read
Proximity
Quick Movement
release
Filter
halt
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IQ Switch®
ProxFusion™ Series
3 Inductive sensing
3.1 Introduction to inductive sensing
The IQS624 provides inductive sensing capabilities to detect the presence of metal/metal-type
objects.
3.2 Channel specifications
The IQS624 requires 3 sensing lines for mutual inductive sensing.
There’s only one distinct inductance user interfaces available.
a) Discreet proximity/touch UI (always enabled)
Table 3.1
CH0
Mutual inductive sensor – channel allocation
Mode
CH1
CH2
CH3
CH4
CH5
Mutual
inductive
o
o
Key:
o - Optional implementation
- Fixed use for UI
3.3 Hardware configuration
Rudimentary hardware configurations (to be completed).
Table 3.2
Mutual inductive hardware description
Mutual inductive
VSS
IQS624
Mutual
inductance
RX0
LTX
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IQ Switch®
ProxFusion™ Series
3.4 Register configuration
Table 3.3
Inductive sensing settings registers.
Address
Name
Description
Recommended setting
ProxSense / Capacitive Sensor
mode
and Sensor mode should be set to
Sensing Setting 0
configuration of each Inductive mode
channel.
0x40, 0x41
Deactivate one channel
Enable both RX for the
activated channel
ProxSense / Capacitive Global settings for the CS divider should be enabled
Sensing Setting 1 ProxSense sensors
0x42
ProxSense / Capacitive ATI
Sensing Setting 2 ProxSense sensors
settings
for ATI target should be more than
ATI base to achieve an ATI
0x43, 0x44
ProxSense / Capacitive Additional
Global None
settings for ProxSense
sensors
0x45
Sensing Setting 3
Proximity threshold
Touch threshold
Proximity Threshold for Less than touch threshold
UI
0x46, 0x47
0x48, 0x49
Touch Threshold for UI None
3.4.2 Example code:
Example code for an Arduino Uno can be downloaded at:
www.azoteq.com//images/stories/software/IQS62x_Demo.zip
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January 2017
IQ Switch®
ProxFusion™ Series
4 Hall-effect sensing
4.1 Introduction to Hall-effect sensing
The IQS624 has two internal Hall-effect sensing plates (on die). No external sensing hardware is
required for Hall-effect sensing.
The Hall-effect measurement is essentially a current measurement of the induced current
through the Hall-effect-sensor plates produced by the magnetic field passing perpendicular
through each plate.
Advanced digital signal processing is performed to provide sensible output data.
Hall output is linearized by inverting signals.
Calculates absolute position in degrees.
Auto calibration attempts to linearize degrees output on the fly
Differential Hall-Effect sensing:
o Removes common mode disturbances
4.2 Channel specifications
Channels 2 to 5 are dedicated to Hall-effect sensing. Channel 2 & 4 performs the positive
direction measurements and channel 3 & 5 will handle all measurements in the negative
direction. Differential data can be obtained from these four channels. This differential data is
used as input data to calculate the output angle of the Hall-effect rotation UI. Channel 2 & 3 is
used for the one plate and channel 4 & 5 for the second.
Table 4.1
CH0
Hall-effect sensor – channel allocation
Mode
CH1
CH2
CH3
CH4
CH5
Hall rotary
UI
1st plate
Positive
1st plate
Negative
2nd plate
Positive
2nd plate
Negative
Key:
o - Optional implementation
- Fixed use for UI
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IQ Switch®
ProxFusion™ Series
4.3 Hardware configuration
Rudimentary hardware configurations. For more detail and alternative placement options, refer
to appendix A.
Diametrically polarized magnet (rotational purposes)
Hall
Rotation
UI
S
N
X-Y
S
N
4.4 Register configuration
Table 4.2
Hall sensing settings registers
Description Recommended setting
Address
70H
Name
Hall Rotation UI Hall wheel UI settings
Settings
Hall UI should be enabled for
degree output
Hall
settings
sensor Auto
ATI
and
charge Auto ATI should be enabled for
temperature drift compensation
71H
72H, 73H
78H
frequency settings
Hall ATI Settings Hall channels ATI settings
ATI Target should be more than
base
Hall ratio Settings Invert Direction setting for None
Hall UI
Sin(phase)
constant
Sin phase calibration value
Calculate this value using the GUI
or the calculations in the appendix
A
79H
7AH
Cos(phase)
constant
Cos phase calibration value
Calculate this value using the GUI
or the calculations in the appendix
A
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IQ Switch®
ProxFusion™ Series
4.4.2 Example code:
Example code for an Arduino Uno can be downloaded at:
www.azoteq.com//images/stories/software/IQS62x_Demo.zip
4.5 Sensor data output and flags
a) The Hall UI Flags (0x14). Bit7 is dedicated to indicating a movement of the magnet.
Bit6 indicates the direction of the movement.
Hall UI Flags (0x14)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read
Wheel
movement direction
Movement
Count Difference
sign sign
b) The Degree Output (0x81-0x80). A 16-bit value for the degrees can be read from
these registers. (0-360 degrees)
Degree Output (0x81-0x80)
Bit Number 15 14 13 12 11 10
Data Access
9
8
7
6
5
4
3
2
1
0
Read/Write
Name
Degrees High Byte
Degrees Low Byte
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January 2017
IQ Switch®
ProxFusion™ Series
5 Device clock, power management and mode operation
5.1 Device main oscillator
The IQS624 has a 16MHz main oscillator (default enabled) to clock all system functionality.
An option exists to reduce the main oscillator to 8MHz. This will result in charge transfers to be
slower by half of the default implementations.
To set this option this:
o As a software setting – Set the System_Settings: bit4 = 1, via an I2C command.
o As a permanent setting – Set the OTP option in FG Bank 0: bit2 = 1, using Azoteq
USBProg program.
5.2 Device modes
The IQS624 supports the following modes of operation;
Normal mode (Fixed report rate)
Low Power mode (Reduced report rate, no UI execution)
Ultra-Low Power mode (Only channel 0 is sensed for a prox)
Halt Mode (Suspended/disabled)
Note: Auto modes must be disabled to enter or exit halt mode.
The device will automatically switch between the different operating modes by default.
However, this Auto mode feature may be disabled by setting the DSBL_AUTO_MODE bit
(Power mode Settings 0xD2: bit5) to confine device operation to a specific power mode. The
POWER_MODE bits (Power mode Settings 0xD2: bit4-3) can then be used to specify the
desired mode of operation.
5.2.1 Normal mode
Normal mode is the fully active sensing mode to function at a fixed report rate specified in the
Normal Mode report rate (0xD3) register. This 8-bit value is adjustable from 0ms – 255ms in
intervals of 1ms.
Note: The device’s low power oscillator has an accuracy as specified in section 9.
5.2.2 Low power mode
Low power mode is a reduced sensing mode where all channels are sensed but no UI code
are executed. The sample rate can be specified in the Low Power Mode report rate (0xD4)
register. The 8-bit value is adjustable from 0ms – 255ms in intervals of 1ms. Reduced report
rates also reduce the current consumed by the sensor.
Note: The device’s low power oscillator has an accuracy as specified in section 9.
5.2.3 Ultra-low power mode
Ultra-low power mode is a reduced sensing mode where only channel 0 is sensed and no
other channels or UI code are executed. Set the EN_ULP_MDE bit (Power mode Settings:
bit6) to enable use of the ultra-low power mode. The sample rate can be specified in the Low
Power Mode report rate (0xD5) register. The 8-bit value is adjustable from 0ms – 4sec in
intervals of 16ms.
Wake up will occur on proximity detection on channel 0.
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5.2.4 Halt mode
Halt mode will suspend all sensing and will place the device in a dormant or sleep state. The
device requires an I2C command from a master to explicitly change the power mode out of the
halt state before any sensor functionality can continue.
5.2.5 Mode time
The mode time is specified in the Auto Mode Timer (0xD6) register. The 8-bit value is
adjustable from 0ms – 2 min in intervals of 500ms.
5.3 Streaming and event mode:
Streaming mode is the default. Event mode is enabled by setting bit 5 in register 0xD0.
5.3.1 Streaming mode
The ready is triggered every cycle and per the report rate.
5.3.2 Event mode
The ready is triggered only when an event has occurred.
The events which trigger the ready:
Hall wheel movement (If the hall UI is enabled)
Touch or proximity events on channel 0 or 1
Note: Both these events have built in hysteresis which filters out very slow changes
5.4 Report rates
5.4.1 Calculation of each mode’s report rate
Normal Power Segment rate
To be completed.
Auto modes change rates
To be completed.
Streaming/event mode rates
To be completed.
5.5 System reset
The IQS624 device monitor’s system resets and events.
a) Every device power-on and reset event will set the Show Reset bit (System Flags 0x10:
bit7) and the master should explicitly clear this bit by setting the ACK_RESET (bit6) in
System Settings 0.
b) The system events will also be indicated with the Global Events register’s SYS bit
(Global Events 0x11: bit4) if any system event occur such as a reset. This event will
continuously trigger until the reset has been acknowledged.
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IQ Switch®
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6 Communication
6.1 I2C module specification
The device supports a standard two wire I2C interface with the addition of an RDY (ready interrupt)
line. The communications interface of the IQS624 supports the following:
Streaming data as well as event mode.
The master may address the device at any time. If the IQS624 is not in a communication
window, the device returns an ACK after which clock stretching is induced until a
communication window is entered. Additional communication checks are included in the
main loop in order to reduce the average clock stretching time.
The provided interrupt line (RDY) is open-drain active low implementation and indicates a
communication window.
6.2 Device address and sub-addresses
The default device address is 0x44.
Alternative sub-address options are available to be defined in the OTP Bank0 (bit3; 0; bit1; bit0)
a) Default address:
b) Sub-address:
c) Sub-address:
d) Sub-address:
e) Sub-address:
f) Sub-address:
g) Sub-address:
h) Sub-address:
0x44
0x45
0x46
0x47
0x4C
0x4D
0x4E
0x4F
6.3 Additional OTP options
All one-time-programmable device options are located in FG bank 0.
Floating Gate Bank0
Bit Number
Name
7
-
6
5
-
4
3
2
1
0
Comms
ATI
Rdy active
high
Sub address 8MHz
2
Sub address 0-1
Bit definitions:
Bit 0,1,3: I2C sub-address
o I2C address = 0x44 OR (0, 0, 0, 0, I2C_SUB_ADR_3, 0, I2C_SUB_ADR_1,
I2C_SUB_ADR_0 )
Bit 2: Main Clock frequency selection
o 0: Run FOSC at 16MHz
o 1: Run FOSC at 8MHz
Bit 4: Rdy active high
o 0: Rdy active low enabled
o 1: Rdy active high enabled
Bit 6: Comms mode during ATI
o 0: No streaming events are generated during ATI
o 1: Comms continue as setup regardless of ATI state.
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IQ Switch®
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6.4 Recommended communication and runtime flow diagram
The following is a basic master program flow diagram to communicate and handle the device.
It addresses possible device events such as output events, ATI and system events (resets).
.
Figure 6.1
Master command structure and runtime event handling flow diagram
It is recommended that the master verifies the status of the System_Flags0 bits to identify events
and resets. Detecting either one of these should prompt the master to the next steps of handling
the IQS624.
Streaming mode communication is used for detail sensor evaluation during prototyping and/or
development phases.
Event mode communication is recommended for runtime use of the IQS624. Streaming mode
communication is used for detail sensor evaluation during prototyping/development.
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IQ Switch®
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7 IQS624 Memory map
Table 7.1
: IQS624 Register map
Register Address
00H
Group
Register Name
Product Number
01H
Device Information
Hardware Number
02H
Software Number
10H
Sys_flags0
11H
UI Flags
12H
Device Specific Data
Touch/Prox Flags
13H
SUID UI Flags
14H
HALL UI Flags
20H
CH0 CS High
21H
CH0 CS Low
22H
CH1 CS High
23H
CH1 CS Low
24H
CH2 CS High
25H
CH2 CS Low
26H
CH3 CS High
27H
CH3 CS Low
Count Data
28H
CH4 CS High
29H
CH4 CS Low
2AH
2BH
30H
CH5 CS high
CH5 CS low
CH0 LTA high
31H
CH0 LTA low
32H
CH1 LTA high
33H
CH1 LTA low
40H
Ch0 ProxSense / Capacitive Sensing Settings 0
CH1 ProxSense / Capacitive Sensing Settings 0
CH0&1 ProxSense / Capacitive Sensing Setting 1
Ch0 ProxSense / Capacitive Sensing Settings 2
CH1 ProxSense / Capacitive Sensing Settings 2
CH0/1 ProxSense / Capacitive Sensing Setting 3
Ch0 Compensation
Ch1 Compensation
Ch0 Multipliers
41H
42H
43H
44H
Touch / Proximity
sensor settings
45H
46H
47H
48H
49H
Ch1 Multipliers
50H
Ch0 Proximity threshold
Ch0 Touch threshold
Ch1 Proximity threshold
Ch1 Touch threshold
UI Halt timer
51H
Touch / Proximity
UI settings
52H
53H
54H
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IQ Switch®
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Register Address
60H
Register Name
Small user interaction detection Setting 0
Small user interaction detection Setting 1
Release Threshold
61H
62H
Small User
interaction detection
63H
Small user interaction detection Proximity threshold
Small user interaction detection Touch threshold
Halt timer
64H
65H
70H
Hall Rotation UI Settings
71H
Hall sensor settings
72H
CH2&3 Hall ATI Settings
73H
CH4&5 Hall ATI Settings
74H
CH2&3 Compensation
HALL Sensor
Settings
75H
CH4&5 Compensation
76H
CH2&3 Multipliers
77H
CH4&5 Multipliers
78H
Hall ratio Settings
79H
Sin(phase) constant
7AH
80H
Cos(phase) constant
Degree Output (Low byte)
Degree Output (High byte)
Ratio Output (Low byte)
81H
82H
83H
Ratio Output (High byte)
84H
Numerator of Ratio (Low byte)
Numerator of Ratio (High byte)
Denominator of Ratio (Low byte)
Denominator of Ratio (High byte)
Rotation Correction factor (Low byte)
Rotation Correction factor (High byte)
Max Numerator of Ratio (Low byte)
Max Numerator of Ratio (High byte)
Max Denominator of Ratio (Low byte)
Max Denominator of Ratio (High byte)
Relative rotation angle
85H
86H
87H
HALL Wheel
Output
88H
89H
8AH
8BH
8CH
8DH
8EH
8FH
Movement counter/timer
D0H
D1H
D2H
D3H
D4H
D5H
D6H
General system settings
Active channels
Power mode settings
Device and Power mode
Settings
Normal mode report rate
Low power mode report rate
Ultra-low power mode report rate
Mode time
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IQ Switch®
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7.2 Memory Registers Description
7.2.1 Device Information
Product Number (0x00)
Bit Number
Data Access
Name
7
6
5
4
3
2
2
2
1
1
1
0
0
0
Read
Device Product Number
Bit definitions:
Bit 0-7: Device Product Number = D’67’
Software Number (0x01)
Bit Number
Data Access
Name
7
6
5
4
3
Read
Device Software Number
Bit definitions:
Bit 0-7: Device Software Number = D’02’
Hardware Number (0x02)
Bit Number
Data Access
Name
7
6
5
4
3
Read
Device Hardware Number
Bit definitions:
Bit 0-7: Device Hardware Number = D’162’ for 5V solution, D’130’ for 3.3V solution
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7.2.2 Device Specific Data
System flags (0x10)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read
Show
Reset
Ready
active
high
Current
power
mode
ATI
Busy
Event
NP
Segment
Active
Bit definitions:
Bit 7: Reset Indicator:
o 0: No reset event
o 1: A device reset has occurred and needs to be acknowledged
Bit 6: Ready Active High
o 0: Ready active Low set (Default)
o 1: Ready active High set
Bit 4-3:Current power mode indicator:
o 00: Normal power mode
o 01: Low power mode
o 10: Ultra-Low power mode
o 11: Halt power mode
Bit 2: ATI Busy Indicator:
o 0: No channels are in ATI
o 1: One or more channels are in ATI
Bit 1: Global Event Indicator:
o 0: No new event to service
o 1: An event has occurred and should be serviced
Bit 0: Normal Power segment indicator:
o 0: Not performing a normal power update
o 1: Busy performing a normal power update
UI Flags(0x11)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read
Small
User
PXS
PXS
Touch proximity
interaction
detection
out
out
Bit definitions:
Bit 2: Small User interaction indicator:
o 0: No event to report
o 1: A Movement event has occurred and should be handled
Bit 1: ProxSense / Capacitive Sensing Touch indicator:
o 0: No event to report
o 1: A touch event has occurred and should be handled
Bit 0: ProxSense / Capacitive Sensing proximity indicator:
o 0: No event to report
o 1: A proximity event has occurred and should be handled
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IQ Switch®
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Proximity/Touch UI Flags (0x12)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read
Chan 1 Chan 0
Chan 1
Chan 0
Touch
out
touch
out
proximity proximity
out out
Bit definitions:
Bit 5: Channel 1 touch indicator:
o 0: Channel 1 delta below touch threshold
o 1: Channel 1 delta above touch threshold
Bit 4: Channel 0 touch indicator:
o 0: Channel 0 delta below touch threshold
o 1: Channel 0 delta above touch threshold
Bit 1: Channel 1 Proximity indicator:
o 0: Channel 1 delta below proximity threshold
o 1: Channel 1 delta above proximity threshold
Bit 0: Channel 0 Proximity indicator:
o 0: Channel 0 delta below proximity threshold
o 1: Channel 0 delta above proximity threshold
Small User interaction detection UI Flags (0x13)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read
Proximity
Quick Movement
release
Filter
halt
Bit definitions:
Bit 4: Proximity indicator:
o 0: Delta below proximity threshold
o 1: Delta above proximity threshold
Bit 2: Quick release indicator:
o 0: No quick release detected
o 1: Quick release detected
Bit 1: Movement indicator:
o 0: No movement detected
o 1: Movement detected
Bit 0: Filter halt indicator:
o 0: Delta below filter halt level
o 1: Delta above filter halt level
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IQ Switch®
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Hall UI Flags (0x14)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read
Wheel
movement
Movement
direction
Count Difference
sign
sign
Bit definitions:
Bit7: Wheel movement indicator:
o 0: No wheel movement detected
o 1: Wheel movement detected
Bit6: Movement direction indicator:
o 0: If movement is detected it is in negative direction
o 1: If movement is detected it is in positive direction
Bit1: Count sign:
o 0: Indicates that the movement counts are positive
o 1: Indicates that the movement counts are negative
Bit0: Difference sign:
o 0: Indicates that the angle delta is positive
o 1: Indicates that the angle delta is negative
Hall Ratio Flags (0x15)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read
Move
Max
Max
counter Denominator Numerator
full
set
set
Bit definitions:
Bit 2: Move counter full indicator:
o 0: Movement counter is not full
o 1: Movement counter is full
Bit 1: Max Denominator set indicator:
o 0: Max denominator has not changed
o 1: Max denominator has changed
Bit 0: Max Numerator set indicator:
o 0: Max Numerator has not changed
o 1: Max Numerator has changed
7.2.3 Count Data
Count CS values (0x20/0x21-0x2A/0x2B)
Bit Number 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Data Access
Read
Name
Count High Byte
Count Low Byte
Bit definitions:
Bit 15-0: Counts
o AC filter or raw value
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IQ Switch®
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LTA values (0x30/0x31-0x32/0x33)
Bit Number 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Data Access
Read
Name
LTA High Byte
LTA Low Byte
Bit definitions:
Bit 15-0: LTA Values
o LTA filter value
7.2.4 Touch / Proximity sensor settings
Proximity/touch Mode settings (0x40-0x41)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
Sensor mode
TX select
RX select
Bit definitions:
Bit 7-4:Sensor mode select:
o 0000: Self capacitive mode
o 1001: Mutual Inductance mode
Bit 3-2:TX-select:
o 00: TX 0 and TX 1 is disabled
o 01: TX 0 is enabled
o 10: TX 1 is enabled
o 11: TX 0 and TX 1 is enabled
Bit 1-0:RX select:
o 00: RX 0 and RX 1 is disabled
o 01: RX 0 is enabled
o 10: RX 1 is enabled
o 11: RX 0 and RX 1 is enabled
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IQ Switch®
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Proximity/touch settings (0x42)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
CS PXS
Charge Freq
Proj bias pxs
Auto ATI Mode
Bit definitions:
Bit 6: ProxSense / Capacitive Sensing Capacitor size select:
o 0: ProxSense storage capacitor size is 15 pF
o 1: ProxSense storage capacitor size is 60 pF
Bit 5-4: Charge Frequency select:
o 00: 1/2
o 01: 1/4
o 10: 1/8
o 11: 1/16
Bit 3-2:Projected bias:
o 00: 2.5 µA
o 01: 5 µA
o 10: 10 µA
o 11: 20 µA
Bit 1-0:Auto ATI Mode select:
o 00: ATI Disabled
o 01: Partial ATI (Multipliers are fixed)
o 10: Semi Partial ATI (Coarse multipliers are fixed)
o 11: Full ATI
ATI settings(0x43-0x44)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
ATI Target
ATI Base
Different addresses:
0x43: Channel 0 ATI settings
0x44: Channel 1 ATI settings
Bit definitions:
Bit 7-6:ATI Base value select:
o 00: 75
o 01: 100
o 10: 150
o 11: 200
Bit 5-0:ATI Target:
o ATI Target is 6-bit value x 32
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IQ Switch®
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CH0/1 ProxSense / Capacitive Sensing Setting 3 (0x45)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
ACF
Disable
SUID
Enable
CS Div
Two
sided
PXS
LTA Beta
ACF Beta
Bit definitions:
Bit 7: Small user interactions detection UI Enable:
o 0: Small user interactions detection UI is disabled
o 1: Small user interactions detection UI is enabled
Bit 6: CS divider
o 0: CS divider disabled
o 1: CS divider enabled
Bit 5: Two sided ProxSense / Capacitive Sensing
o 0: Bidirectional detection disabled
o 1: Bidirectional detection enabled
Bit 4: ACF Disable
o 0: AC Filter Enabled
o 1: AC Filter Disabled
Bit 3-2:LTA Beta 0
o 00: 7
o 01: 8
o 10: 9
o 11: 10
Bit 1-0:ACF Beta 1
o 00: 1
o 01: 2
o 10: 3
o 11: 4
Compensation Ch0,1 (0x46,0x47)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
Compensation (7-0)
Bit definitions:
Bit 7-0:0-255: Lower 8 bits of the Compensation Value
Different addresses:
0x46: Channel 0 Lower 8 bits of the Compensation Value
0x47: Channel 1 Lower 8 bits of the Compensation Value
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IQ Switch®
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Multipliers values Ch0,1(0x48/0x49)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
Compensation (9-8) Coarse multiplier
Fine multiplier
Bit definitions:
Bit 7-6:Compensation upper two bits
o 0-3: Upper 2-bits of the Compensation value.
Bit 5-4:Coarse multiplier Selection:
o 0-3: Coarse multiplier selection
Bit 3-0:Fine Multiplier Selection:
o 0-15: Fine Multiplier selection
7.2.5 Touch / Proximity UI settings
Proximity/touch threshold Ch0,1(0x50-0x53)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
Threshold
[50H-53H] Proximity and touch thresholds, bit7-0:
If a difference between the LTA and counts value would exceed this threshold the
appropriate event would be flagged. (either Touch or Proximity Event)
Different addresses:
0x50 Ch0 Proximity Threshold Value
0x51 Ch0 Touch Threshold Value
0x52 Ch1 Proximity Threshold Value
0x53 Ch1 Touch Threshold Value
ProxSense / Capacitive Sensing halt period (0x54)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
ProxSense / Capacitive Sensing halt period
Bit definitions:
Bit 7-0: Halt time in 0.5 second ticks
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IQ Switch®
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7.2.6 Small User interaction detection
Small User interaction detection settings 0(0x60)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
Quick release detection beta
Movement detection beta
Bit definitions:
Bit 6-4:Quick release detection
o 0-7: Quick release filter beta value
Bit 3-0:Movement detection Beta
o 0-15: Movement filter beta value
Small User interaction detection settings 1(0x61)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
LTA Halt Prox timeout
Movement detection threshold
Bit definitions:
Bit 7-4:LTA Halt Prox timeout
o 0-15: LTA Halt timeout in no Prox in 500 ms ticks
Bit 3-0:Movement detection threshold
o 0-15: Movement Threshold Value
Proximity/touch threshold (0x62,0x63-0x64)
Bit Number
Data Access
7
6
5
4
3
2
1
0
Read/Write
Name
Threshold
[62H] Release threshold, bit7-0:
In SUID mode. If a difference between the LTA and counts value would exceed this
threshold the appropriate event would be flagged. (either Quick release, Touch or
Proximity Event)
[63H-64H] Proximity and touch thresholds, bit7-0:
If a difference between the LTA and counts value would exceed this threshold the
appropriate event would be flagged. (either Touch or Proximity Event)
Different addresses:
0x63:
0x64:
SUID Proximity threshold
SUID Touch threshold
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IQ Switch®
ProxFusion™ Series
Small User interaction detection Halt timer period (0x65)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
SUID Halt timer period
Bit definitions:
Bit 7-0:LTA Halt Prox timeout after QRD
o LTA Halt timeout after a Quick release event with no movement in 500 ms ticks
7.2.7 HALL Sensor Settings
Hall Wheel UI Settings 0 (0x70)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
Hall Wheel
UI disable
Auto
calibration
Wheel
wakeup
Bit definitions:
Bit 7: Hall Wheel UI disable
o 0: Hall wheel UI is enabled
o 1: Hall wheel UI is disabled
Bit 2: Auto calibration
o 0: Auto calibration disabled
o 1: Auto calibration enabled
Bit 0: Wheel wakeup select
o 0: Wheel wakeup mode disabled
o 1: Wheel wakeup mode enabled
Hall sensor settings (0x71)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
Charge Freq
Auto ATI mode
Hall
Bit definitions:
Bit 5-4:Charge Frequency: The rate at which our measurement circuit samples
o 00: 1/2
o 01: 1/4
o 10: 1/8
o 11: 1/16
Bit 1-0:Auto ATI Mode
o 00: ATI disabled: ATI is completely disabled
o 01: Partial ATI: Only adjusts compensation
o 10: Semi-Partial ATI: Only adjusts compensation and the fine multiplier.
o 11: Full-ATI: Compensation and both coarse and fine multipliers is adjusted
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IQ Switch®
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ATI settings(0x72-0x73)
7
6
5
4
3
2
1
0
Bit Number
Data Access
Name
Read/Write
ATI Target
ATI Base
Different addresses:
0x72: Channel 2 & 3 ATI settings
0x73: Channel 4 & 5 ATI settings
Bit definitions:
Bit 7-6:ATI Base value select:
o 00: 75
o 01: 100
o 10: 150
o 11: 200
Bit 5-0:ATI Target:
o ATI Target is 6-bit value x 32
Compensation Ch2/3,4/5 (0x74,0x75)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
Compensation (7-0)
Bit definitions:
Bit 7-0: 0-255: Lower 8 bits of the compensation value
Different addresses:
0x74: Channel 2/3 Lower 8 bits of the compensation Value
0x75: Channel 4/5 Lower 8 bits of the compensation Value
Hall Multipliers Ch2/3,4/5 (0x76-0x77)
Bit Number
7
6
5
4
3
2
1
0
Data Access
Name
Read/Write
Compensation 9-8
Coarse Multiplier
Fine Multiplier
Different addresses:
0x76 – Channel 2/3 Multipliers selection
0x77 – Channel 4/5 Multipliers selection
Bit definitions:
Bit 7-6:Compensation 9-8:
o 0-3: Upper 2-bits of the compensation value
Bit 5-4:Coarse multiplier selection
o 0-3: Coarse multiplier selection
Bit 3-0:Fine multiplier selection
o 0-15: Fine multiplier selection
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IQ Switch®
ProxFusion™ Series
Hall ratio settings (0x78)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read
Read/Write
Direction
invert / Cos Negative
negative
Read
Octant
flag
Y
Ratio
Denominator Numerator
negative
negative
negative
Bit definitions:
Bit 6-5:Quadrature output for octant changes (per 45 degrees)
o 0-3: Quadrature output
Bit 3: Invert direction of degrees
o 0 – Invert not active
o 1 – Invert active
Bit 2: Ratio negative
o 0 – Ratio is positive
o 1 – Ratio is negative
Bit 1: Denominator negative
o 0 – Denominator is positive
o 1 – Denominator is negative
Bit 0: Numerator negative
o 0 – Numerator is positive
o 1 – Numerator is negative
Sin constant (0x79)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
Sin constant
Bit definitions:
Bit 7-0:Sin constant:
o Sin (phase difference) x 255
Cos constant (0x7A)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
Cos constant
Bit definitions:
Bit 7-0:Cos constant:
o Cos (phase difference) x 255
Phase difference:
Phase difference measured between the signals obtained from the two Hall sensor
plates. This can be calculated with a simple calibration.
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IQ Switch®
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7.2.8 HALL Wheel Output
Degree Output (0x81-0x80)
Bit Number 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Data Access
Read/Write
Name
Degrees High Byte
Degrees Low Byte
Bit definitions:
0-360: Absolute degree position of magnet
Ratio Output (0x83-0x82)
Bit Number 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Data Access
Read/Write
Name
Degrees High Byte
Degrees Low Byte
Bit definitions:
16-bit value: Ratio used to calculate degrees
Numerator (0x85-0x84)
Bit Number 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Data Access
Read/Write
Name
Numerator High Byte
Numerator Low Byte
Bit definitions:
16-bit value: Numerator used to calculate ratio
Denominator (0x87-0x86)
Bit Number 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Data Access
Read/Write
Name
Denominator High Byte
Denominator Low Byte
Bit definitions:
16-bit value: Denominator used to calculate ratio
Rotation Correction factor (0x89-0x88)
Bit Number 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Data Access
Read/Write
Name
Rotation Correction Factor High Byte
Rotation Correction Factor Low Byte
Bit definitions:
16-bit value: Used for auto calibration
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IQ Switch®
ProxFusion™ Series
Max Numerator (0x8B-0x8A)
Bit Number 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Data Access
Read/Write
Name
Max Numerator High Byte
Max Numerator Low Byte
Bit definitions:
16-bit value: Used during auto calibration
Max Denominator (0x8D-0x8C)
Bit Number 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Data Access
Read/Write
Name
Max Denominator High Byte
Max Denominator Low Byte
Bit definitions:
16-bit value: Used during auto calibration
Relative Rotation Angle (0x8E)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
Relative degrees
Bit definitions:
0-180: Delta in degrees from previous cycle
Movement counter/timer (0x8F)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
Movement Timer
Movement Counter
Bit definitions:
Bit 7-4:Movement Timer
o 0-15: Timer used to detect movement
Bit 3-0:Movement Counter
o 0-15: Counter used to detect movement
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IQ Switch®
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7.2.9 Device and Power Mode Settings
General system settings (0xD0)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
8Mhz Comms
in ATI
Soft
reset
Ack
reset
Event
mode
Small
ATI
Redo
ATI all
Do
reseed
band
Bit definitions:
Bit 7: Soft Reset (Set only, will clear when done)
o 1 – Causes the device to perform a WDT reset
Bit 6: Acknowledge reset (Set only, will clear when done)
o 1 – Acknowledge that a reset has occurred. This event will trigger until
acknowledged
Bit 5: Communication mode selct:
o 0 – Streaming communication mode enabled
o 1 – Event communication mode enabled
Bit 4: Main clock frequency selction
o 0 – Run FOSC at 16Mhz
o 1 – Run FOSC at 8 Mhz
Bit 3: Communication during ATI select:
o 0 – No communication during ATI
o 1 – Communications continue regardless of ATI state
Bit 2: ATI band selection
o 0 – Re ATI when outside 1/8 of ATI target
o 1 – Re-ATI when outside 1/16 of ATI target
Bit 1: Redo ATI on all channels (Set only, will clear when done)
o 1 – Start the ATI process
Bit 0: Reseed All Long term filters (Set only, will clear when done)
o 1 – Start the Reseed process
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IQ Switch®
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Active channels mask (0xD1)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
CH4 CH3
CH5
CH2
CH1
CH0
Bit definitions:
Bit 5: CH5 (note: Ch2, Ch3, Ch4 and Ch5 must all be enabled for Hall effect rotation
UI to be functional)
o 0: Channel is enabled
o 1: Channel is disabled
Bit 4: CH4 (note: Ch2, Ch3, Ch4 and Ch5 must all be enabled for Hall effect rotation
UI to be functional)
o 0: Channel is enabled
o 1: Channel is disabled
Bit 3: CH3 (note: Ch2, Ch3, Ch4 and Ch5 must all be enabled for Hall effect rotation
UI to be functional)
o 0: Channel is enabled
o 1: Channel is disabled
Bit 2: CH2 (note: Ch2, Ch3, Ch4 and Ch5 must all be enabled for Hall effect rotation
UI to be functional)
o 0: Channel is enabled
o 1: Channel is disabled
Bit 1: CH1 (note: Ch0 and Ch1 must both be enabled for Small user interaction
detection UI to be functional)
o 0: Channel is enabled
o 1: Channel is disabled
Bit 0: CH0 (note: Ch0 and Ch1 must both be enabled for Small user interaction
detection UI to be functional)
o 0: Channel is enabled
o 1: Channel is disabled
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IQ Switch®
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Power mode settings (0xD2)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
Enable Disable
Power mode
Np segment rate
ULP
Auto
Mode
Modes
Bit definitions:
Bit 6: Enable Ultra-Low Power Mode
o 0: ULP is disabled during auto-mode switching
o 1: ULP is enabled during auto-mode switching
Bit 5: Disable auto mode switching
o 0: Auto mode switching is enabled
o 1: Auto mode switching is disabled
Bit 4-3:Manually select Power Mode (note: bit 5 must be set)
o 00: Normal Power mode. The device runs at the normal power rate, all enabled
channels and UIs will execute.
o 01: Low Power mode. The device runs at the low power rate, all enabled
channels and UIs will execute.
o 10: Ultra-Low Power mode. The device runs at the ultra-low power rate, Ch0 is
run as wake-up channel. The other channels execute at the NP-segment rate.
o 11: Halt Mode. No conversions are performed; the device must be removed from
this mode using an I2C command.
Bit 2-0:Normal Power Segment update rate
o 000: ½ ULP rate
o 001: ¼ ULP rate
o 010: 1/8 ULP rate
o 011: 1/16 ULP rate
o 100: 1/32 ULP rate
o 101: 1/64 ULP rate
o 110: 1/128 ULP rate
o 111: 1/256 ULP rate
Normal/Low/Ultra-Low power mode report rate (0xD3,0xD4)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
Normal/Low power mode report rate
Different addresses:
0xD3: Normal mode report rate in ms (note: LPOSC timer has +- 4 ms accuracy)
0xD4: Low-power mode report rate in ms (note: LPOSC timer has +- 4 ms accuracy)
0xD5: Ultra-low power mode report rate in 16 ms ticks
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IQ Switch®
ProxFusion™ Series
Auto Mode time (0xD6)
Bit Number
Data Access
Name
7
6
5
4
3
2
1
0
Read/Write
Mode time
Bit definitions:
Bit 7-0: Auto modes switching time in 500 ms ticks
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January 2017
IQ Switch®
ProxFusion™ Series
8 Electrical characteristics
8.1 Absolute Maximum Specifications
The following absolute maximum parameters are specified for the device:
Exceeding these maximum specifications may cause damage to the device.
Table 8.1
Absolute maximum specification
IQS624-3yy
Parameter
IQS624-5yy
Operating temperature
-40°C to 85°C
Supply voltage range (VDDHI – GND)
Maximum pin voltage
1.78V - 3.6V
2.4V - 5.5V
VDDHI + 0.5V (may not exceed VDDHI max)
Maximum continuous current (for specific Pins)
Minimum pin voltage
10mA
GND - 0.5V
Minimum power-on slope
100V/s
ESD protection
±4kV (Human body model)
8.2 Power On-reset/Brown out
Table 8.2
Power on-reset and brown out detection specifications
Description
Power On Reset
Brown Out Detect VDDHI Slope ≥ 100V/s @25°C BOD
Conditions
Parameter
MIN
MAX
UNIT
VDDHI Slope ≥ 100V/s @25°C POR
1.15
1.2
1.6
1.6
V
V
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IQ Switch®
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8.3 Current consumptions
8.3.1 IC subsystems
Table 8.3
IC subsystem current consumption
Description
TYPICAL MAX UNIT
Core active
Core sleep
339
0.63
1.5
377 µA
1
2
µA
Hall sensor active
mA
Table 8.4
IC subsystem typical timing
Description
Normal
Core active
Core sleep
Hall sensor active
Total
Unit
5
5
5
0.5
0.5
0
10
48
ms
ms
Low
43
Ultra-low
1.75
128
129.75 ms
8.3.2 Capacitive sensing alone
Table 8.5 Capacitive sensing current consumption
Solution Power mode Conditions Report rate TYPICAL UNIT
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
5V
NP mode
NP mode
LP mode
LP mode
ULP mode
ULP mode
NP mode
NP mode
LP mode
LP mode
ULP mode
ULP mode
VDD = 1.8V
VDD = 3.3V
VDD = 1.8V
VDD = 3.3V
VDD = 1.8V
VDD = 3.3V
VDD = 2.5V
VDD = 5.5V
VDD = 2.5V
VDD = 5.5V
VDD = 2.5V
VDD = 5.5V
10 ms
10 ms
48 ms
48 ms
128 ms
128 ms
10 ms
10 ms
48 ms
48 ms
128 ms
128 ms
43.5
44.4
13.3
13.8
3.9
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
4.5
51.3
52.3
14.5
15.5
3.9
5V
5V
5V
5V
5V
5.1
-These measurements where done on the default setup of the IC
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IQ Switch®
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8.3.3 Hall-effect sensing alone
Table 8.6
Hall-effect current consumption
Solution Power mode Conditions Report rate TYPICAL UNIT
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
5V
NP mode
NP mode
LP mode
LP mode
ULP mode
ULP mode
NP mode
NP mode
LP mode
LP mode
ULP mode
ULP mode
VDD = 1.8V
VDD = 3.3V
VDD = 1.8V
VDD = 3.3V
VDD = 1.8V
VDD = 3.3V
VDD = 2.5V
VDD = 5.5V
VDD = 2.5V
VDD = 5.5V
VDD = 2.5V
VDD = 5.5V
10 ms
10 ms
48 ms
48 ms
128 ms
128 ms
10 ms
10 ms
48 ms
48 ms
128 ms
128 ms
215.2
212.6
58.3
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
55.1
N/A (1)
N/A (1)
240.0
239.3
64.1
5V
5V
5V
64.8
5V
N/A (1)
N/A (1)
5V
-These measurements where done on the default setup of the IC
(1) –It is not advised to use the IQS624 in ULP without capacitive sensing. This is due to the Hall-effect sensor
being disabled in ULP.
8.3.4 Halt mode
Table 8.7
Halt mode current consumption
Solution
Power mode
Conditions
TYPICAL
UNIT
3.3V
3.3V
5V
Halt mode
Halt mode
Halt mode
Halt mode
VDD = 1.8V
VDD = 3.3V
VDD = 2.5V
VDD = 5.5V
1.6
1.9
1.1
2.2
µA
µA
µA
µA
5V
8.4 Capacitive loading limits
To be completed.
8.5 Hall-effect measurement limits
To be completed.
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IQ Switch®
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9 Package information
9.1 DFN10 package and footprint specifications
Table 9.1
DFN-10 Package
Figure 9.1 DFN-10 Package
dimensions (bottom). Note that the
saddle need to be connected to GND
on the PCB.
dimensions (bottom)
Dimension
[mm]
3 ±0.1
0.5
0.25
n/a
A
B
C
D
F
3 ±0.1
0.4
L
P
Q
2.4
1.65
Figure 9.2 DFN-10 Package
dimensions (side)
Table 9.2
DFN-10 Package
dimensions (side)
Dimension [mm]
G
H
I
0.05
0.65
0.7-0.8
Table 9.3
DFN-10 Landing
dimensions
Dimension
[mm]
2.4
1.65
0.8
0.5
0.3
A
B
C
D
E
F
3.2
Figure 9.3 DFN-10 Landing dimension
A
B
D
C
P
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IQ Switch®
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9.2 Device marking and ordering information
9.2.1 Device marking:
IQS624-xyy z t P WWYY
A
B C
D
E
A. Device name: IQS624-xyy
x – Version
3: 3V version
5: 5V version(1)
yy – Config(2)
00: 44H sub-address
01: 45H sub-address
B. IC revision number: z
C. Temperature range: t
i: industrial, 40° to 85°C
D. For internal use
E. Date code: WWYY
F. Pin 1: Dot
Notes:
(1) 5V version is not in mass production, only available on special request.
(2) Other sub-addresses available on special request, see section 6.2.
9.2.2 Ordering Information:
IQS624-xyyppb
x –
Version
3 or 5
yy – Config
00 or 01
pp – Package type
DN (DFN(3x3)-10)
b – Bulk packaging
R (3k per reel, MOQ=1 Reel)
Example:
IQS624-300DNR
3
00
- refers to 3V version
- config is default (44H sub-address)
DN - DFN(3x3)-10 package
- packaged in Reels of 3k (has to be ordered in multiples of 3k)
R
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IQ Switch®
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9.3 Tape and reel specification
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IQ Switch®
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9.4 MSL Level
Moisture Sensitivity Level (MSL) relates to the packaging and handling precautions for some
semiconductors. The MSL is an electronic standard for the time period in which a moisture
sensitive device can be exposed to ambient room conditions (approximately 30°C/85%RH see
J-STD033C for more info) before reflow occur.
Package
Level (duration)
MSL 2 (1 year @ < 30/60% RH)
DFN(3x3)-10
Reflow profile peak temperature < 260 °C for < 30 seconds
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IQ Switch®
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10 Datasheet revisions
10.1Revision history
V0.1 – Preliminary structure
V1.03a – Preliminary datasheet
V1.04a – Corrected the following:
Updated 0x43-0x44 registers: ATI base is [7:6] and not [7:5]
Added 0x72 and 0x73 registers: ATI settings for CH 2-5
Added Streaming and event mode chapters
Added 5V and 3.3V solution
V1.05a - Corrected the following:
Changed ESD rating
Added calibration and magnet orientation appendix
Added induction to summary page
Updated schematic
Updated disclaimer
Updated software and hardware number
V1.10 – Changed from preliminary to production datasheet
Added:
Hall ATI Explanation
Current measurements for power modes
Register Configuration
Updated:
Calibration calculations
Current consumption on overview
Appendices
Pinout update, pin 9 - NC
V1.11 – Updated datasheet
Added:
Device markings, order information
Relative/ absolution summary to appendix
Updated:
Supply voltage range
Reference schematic
Updated MSL data
V1.12 – Minor updates
Updated:
Titel
Images
10.2Errata
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IQ Switch®
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11 Contact Information
USA
Asia
South Africa
Physical
Address
Rm2125, Glittery City
Shennan Rd
Futian District
Shenzhen, 518033
China
109 Main Street
Paarl
7646
6507 Jester Blvd
Bldg 5, suite 510G
Austin
TX 78750
USA
South Africa
Postal
Address
Rm2125, Glittery City
Shennan Rd
Futian District
Shenzhen, 518033
China
PO Box 3534
Paarl
7620
6507 Jester Blvd
Bldg 5, suite 510G
Austin
TX 78750
USA
South Africa
Tel
+1 512 538 1995
+1 512 672 8442
info@azoteq.com
+86 755 8303 5294
ext 808
+27 21 863 0033
+27 21 863 1512
info@azoteq.com
Fax
Email
info@azoteq.com
Please visit www.azoteq.com for a list of distributors and worldwide representation.
The following patents relate to the device or usage of the device: US 6,249,089; US 6,952,084; US 6,984,900; US
7,084,526; US 7,084,531; US 8,395,395; US 8,531,120; US 8,659,306; US 8,823,273; US 9,209,803; US 9,360,510; EP
2,351,220; EP 2,559,164; EP 2,656,189; HK 1,156,120; HK 1,157,080; SA 2001/2151; SA 2006/05363; SA 2014/01541; SA
2015/023634
IQ Switch®, SwipeSwitch™, ProxSense®, LightSense™, AirButtonTM, ProxFusion™, Crystal Driver™ 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 information for any purpose. Values in the datasheet is subject to change without notice, please ensure
to always use the latest version of this document. Application specific operating conditions should be taken into account during design and verified before mass production. 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 or caused by,
without limitation, failure of performance, error, omission, interruption, defect, delay in operation or transmission, 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 or 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 prior notification. For the most up-to-date information and binding Terms and Conditions please refer to www.azoteq.com
www.azoteq.com/ip
info@azoteq.com
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IQ Switch®
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12 Appendices
12.1Appendix A: Magnet orientation and calibration
The IQS624 is able to calculate the angle of a magnet using two Hall sensors which are
located in two corners of the die within the package. The two Hall sensors gather data of the
magnet field strength in the z-axis. The difference between the two Hall sensors’ data can be
used to calculate a phase. This phase difference can then be transformed to degrees.
Key considerations for the IQS624:
There must be a phase difference of 1º-179° between the two Hall sensors.
It’s impossible to calculate the angle if the phase difference is 0° or 180°.
20mT peak N/S on each Hall sensor
A minimum of 20mT peak to peak signal is needed on the plates to ensure optimal on-
chip angle calculation.
Ideal design considerations:
Stable phase difference – This helps with the linearity of the maths.
Big phase difference – The maths involved has better results with bigger phase difference.
Distance between the sensors and the magnet should be the same for both – this insures
that the magnet fields observed on both sensors are relatively the same.
Figure 1 - A layout of the IQS624 die in a DFN10 package.
Note the Hall sensors at two of the corners.
Please note: The rectangles which represent the hall sensors in these diagrams are only approximations of where the hall sensors can
be found and is not to scale.
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IQ Switch®
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Figure 2 - Technical Drawing showing DIE placement within the package.
The Hall-Plates are shown as the two green pads in the corners of the DIE.
Package axis and hall-plate axis are also shown.
Absolute or relative applications
There are two general applications for a Hall sensor, absolute and relative.
An absolute application requires the physical absolute angle of the magnet as an input. It is only
possible to obtain the physical angle from a dipole magnet.
A relative application requires the difference between two positions of the magnet as an input.
This makes it possible to use either a dipole or multipole magnet. The relative application can
also be referred to as an incremental application.
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IQ Switch®
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Preferred magnet orientation
The preferred or ideal magnet placement would be if the magnet was centred over the die with the
axis of the magnet centred between the two Hall sensors.
Figure 3 - A magnet placed ideally over the DFN10 package. Note that the magnet field
strength is measured in the z-axis.
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Evaluation kit magnet orientation
There are two orientations which are used for the evaluation kits, one of which has the magnet
axis perpendicular with the IQS624 and the other has the magnet axis parallel with the
IQS624.
Parallel magnet solution
A diametric polarised magnet parallel with the IQS624.
Figure 4 - A diagram showing the Hall sensors relative to the magnet.
Please note: The rectangles which represent the hall sensors in these diagrams are only approximations of where the hall sensors can
be found and is not to scale.
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Perpendicular magnet solution
A multipole diametric polarised magnet perpendicular but off-centre with the IQS624. This is a
typical orientation for a relative application.
Figure 5 - A diagram showing the Hall sensors relative to the multipole magnet.
Please note: The rectangles which represent the hall sensors in these diagrams are only approximations of where the hall sensors can
be found and is not to scale.
Preferred magnet orientation comments
Both solutions promote the ideal conditions. However, the EV kit with the magnet parallel with the
IC could be more Ideal as shown previously. This design was chosen to display the ease of
placement our product offers with the built-in corrections and linearization algorithms.
Small movements of the magnet have less impact on the phase difference.
The distance between the magnet and the two sensors are relatively equivalent.
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January 2017
IQ Switch®
ProxFusion™ Series
Alternative orientation
Off-centred perpendicular diametrical magnet
Here are two possible solutions. Note that both are off-centred. This is to ensure that a phase
difference between the two signals are detected.
Figure 3 - A slightly off centred
Figure 4 - A diametrical barrel magnet
diametrical ring magnet
next to the IC. The distance between
the sensor and the magnet is greater
in this solution, thus a stronger
magnet is suggested.
Please note: The rectangles which represent the hall sensors in these diagrams are only approximations of where the hall sensors can
be found and is not to scale.
Even though these solutions will work we do not encourage their use. We designed this product
with the idea to promote easy usage and fewer physical restrictions to the usage. These solutions
require more critical design on the physical layout and rigidness in the final project.
Copyright © Azoteq 2016
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IQS624 Datasheet v1.12
Page 55 of 62
January 2017
IQ Switch®
ProxFusion™ Series
Calibration of the IQS624
How to calculate the calibration constants using the IQS624 GUI
Step 1: Open the IQS624 GUI, connect the device and start.
If the IQS624 device is connected the GUI should look like the previous figure.
Step 2: Align the Hall sensor channels and start the calibration
A. The four Hall channels.
B. The channels should be lined up or as lined up as possible. This step can be skipped but it
has been observed that better results has been obtained by adding this step.
C. The calibration button. If this button is clicked, the calibration process will start.
Copyright © Azoteq 2016
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IQS624 Datasheet v1.12
Page 56 of 62
January 2017
IQ Switch®
ProxFusion™ Series
Step 3a: Calibrating the device
A. This banner indicates that the calibration progress has started.
B. Like this text instructs, the user must rotate the wheel on the IQS624 device 360 degrees.
It is encouraged that the wheel must be rotated at a constant and low speed.
Step 3b: Calibration failure
A. If this banner pop’s up while rotating the wheel an error was received while calibrating the
device.
B. This text also informs an error has occurred.
If an error occurs step 2-3a should be repeated.
Copyright © Azoteq 2016
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IQS624 Datasheet v1.12
Page 57 of 62
January 2017
IQ Switch®
ProxFusion™ Series
Step 3c: Calibration complete and successful
A. This text confirms that the calibration is completed and successful and that the constants
have been written to the device.
Step 4: Obtaining the calibration constants
A. The settings button to open the settings window.
B. The Hall settings tab which contains all the settings for the Hall UI
C. This button updates the settings window from the connected device. Its recommended that
this button should be clicked before the values are used from this window.
D. The calibration constants. The sin phase and cos phase are the two constants which are
written to the device. The phase (its displayed in degrees) can also be used to obtain both
of these constants.
If this calibration is done on a product the constants obtained from the calibration can be used
for projects with the same physical layout and magnet. This means that only one calibration is
needed per product.
Copyright © Azoteq 2016
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IQS624 Datasheet v1.12
Page 58 of 62
January 2017
IQ Switch®
ProxFusion™ Series
How to calculate the calibration constants using the raw data
There are two Hall Plates that make up the sensor, separated by a fixed distanced in the IC
package, as described previously. These plates, designated Plate 1 & Plate 2, each have two
associated data channels that sense the North-South magnetic field coincident on the plates.
For Plate 1: CH2 is the non-inverted channel, and CH3 is the inverted channel.
For Plate 2: CH4 is the non-inverted channel, and CH5 is the inverted channel.
E.g. on Plate 1, if CH2 increases in value in the presence of an increasing North field, then CH3
decreases in value in the presence of an increasing North field.
The phase delta observed between the plates can be calculated from either the non-inverted, or
the inverted channel pairs.
To calculate the phase delta:
Symbols
푃
푛
Non-inverted channel of Plate n: 푤ℎ푒푟푒 푃 = 퐶퐻2, 푎ꢀ푑 푃2 = 퐶퐻4
1
푃′
Inverted channel of Plate n: 푃′ = 퐶퐻3, 푎ꢀ푑 푃2′ = 퐶퐻5
푛
1
|
푃
Max value of the channel
푛 푚ꢁ푥
|
푃
Min value of the channel
푛 푚푖푛
휃∆
Phase observed between the plates
Calculations
To calculate the phase, for at least one full rotation of the magnet, capturing all four channels:
First normalize the data for each channel, to obtain.
|
ꢂꢃ
− ꢂꢃ
ꢄ
ꢄ ꢅꢆꢇ
ꢂꢃ
ꢄ
(
)
( )
ꢉ
푁 퐶퐻푛
=
|
|
ꢄ ꢅꢈꢄ
ꢂꢃ
− ꢂꢃ
ꢄ ꢅꢆꢇ
|
ꢂꢃ
ꢄ ꢅꢈꢄ
The data will now range between 0 – 1.
{
}
{
}
(
)
For the non-inverted pair: 푃2, 푃1 = 퐶퐻4, 퐶퐻2 sample both channels where 푁 퐶퐻4 ≈ 0.ꢊ.
With these values, the phase delta can be calculated:
−1(| (
푁 퐶퐻4 ꢌ 푁 퐶퐻2 ∙ ꢍ
)
(
)|
)
( )
ꢍ
휃∆ = 푠ꢋꢀ
′
′
{
}
{
}
Likewise, the phase delta can be calculated from the inverted pair: 푃2 , 푃1 = 퐶퐻5, 퐶퐻3
(
)
sample both channels where 푁 퐶퐻5 ≈ 0.ꢊ.
′
−1(| (
) ( )| )
푁 퐶퐻5 ꢌ 푁 퐶퐻3 ∙ ꢍ
( )
ꢎ
휃∆ = 푠ꢋꢀ
And, while the phase angles are theoretically equal, due to misalignments, 휃∆ ≈ 휃∆′ .
To increase accuracy of the observed phase, the two calculated phases can be averaged,
leading the final Observed phase as:
−1(| (
)
(
)|
)
−1(| (
)
푁 퐶퐻5 ꢌ 푁 퐶퐻3 ∙ ꢍ
)
(
)|
푠ꢋꢀ
푁 퐶퐻4 ꢌ 푁 퐶퐻2 ∙ ꢍ + 푠ꢋꢀ
( )
ꢏ
휃∆ =
ꢍ
{
}
(
)
{
}
NB: Remember that 퐶퐻4, 퐶퐻2 are evaluated at 푁 퐶퐻4 ≈ 0.ꢊ. While separately, 퐶퐻5, 퐶퐻3
(
)
are evaluated at 푁 퐶퐻5 ≈ 0.ꢊ. Even when used together in Equation (4).
Copyright © Azoteq 2016
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IQS624 Datasheet v1.12
Page 59 of 62
January 2017
IQ Switch®
ProxFusion™ Series
The IQS624 uses this phase delta as a constant to calculate the angle. The phase delta is
saved on the IC after it has been converted to (푠ꢋꢀ(휃∆) ∙ ꢍꢊ6) and (푐표푠(휃∆) ∙ ꢍꢊ6). This is done
to lessen computations and memory usage on the chip.
This means that if the phase were to change, the constants would need to be recalculated. If
the application of this IC ensures nothing or little movement, the master device would only
need to write the values each time the IC resets and would not need to re-calculate it. Making
it possible to calculate the phase delta once before production and using that value for the
application.
An example of well aligned channels, the phase offset visible between the inverted and non-
inverted channel pairs of the two plates:
Experimentally, jog the XYZ alignment of the magnet relative to the IC and perform at least
one full rotation of the magnet, assess the peaks of the channels; repeat this until all channels
have approximately the same amplitude.
To change the sensitivity of the ProxEngine to Magnetic Field Strength, the ATI parameters on
the IC can be adjusted as described in the following section.
Copyright © Azoteq 2016
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IQS624 Datasheet v1.12
Page 60 of 62
January 2017
IQ Switch®
ProxFusion™ Series
Hall ATI
Azoteq’s ProxFusion™ Hall technology has ATI Functionality; which ensures stable sensor
sensitivity. The ATI functionality is similar to the ATI functionality found in ProxSense® technology.
The difference is that the Hall ATI requires two channels for a single plate.
Using two channels ensures that the ATI can still be used in the presence of the magnet. The two
channels are the inverse of each other, this means that the one channel will sense North and the
other South. The two channels being inverted allows the capability of calculating a reference value
which will always be the same regardless of the presence of a magnet.
Hall reference value:
The equation used to calculate the reference value, per plate:
ꢉ
푅푒푓 =
푛
ꢍ ∙ ꢐꢑ1
+
1ꢒ ꢓ
ꢑ
ꢄ
ꢄ
ATI parameters:
The ATI process adjusts three values (Coarse multiplier, Fine multiplier, Compensation) using two
parameters per plate (ATI base and ATI target). The ATI process is used to ensure that the
sensor’s sensitivity is not severely affected by external influences (Temperature, voltage supply
change, etc.).
Coarse and Fine multipliers:
In the ATI process the compensation is set to 0 and the coarse and fine multipliers are adjusted
such that the counts of the reference value (푅푒푓) are roughly the same as the ATI Base value.
This means that if the base value is increased, the coarse and fine multipliers should also increase
and vice versa.
ATI-Compensation:
After the coarse and fine multipliers are adjusted, the compensation is adjusted till the reference
value (푅푒푓) reaches the ATI target. A higher target means more compensation and therefore more
sensitivity on the sensor.
The ATI-Compensation adjusts chip sensitivity; and, must not be confused with the On-chip
Compensation described below. On-chip Compensation corrects minor displacements or magnetic
non-linearities. This compensation ensures that both channels of each plate – which represent
North and South individually – have the same swing. On-chip compensation is performed in the UI
and is not observable on the raw channel data.
The ATI process ensures that long term temperature changes, or bulk magnetic interference (e.g.
the accidental placement of another magnet too close to the setup), do not affect the sensor’s
ability to detect the rotating magnet.
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IQS624 Datasheet v1.12
Page 61 of 62
January 2017
IQ Switch®
ProxFusion™ Series
Recommended parameters:
There are recommended parameters to ensure optimal use. Optimally the settings would be set up
to have a max swing of 1000 from peak to peak and a reference value below 1000 counts.
The recommended parameters are:
ATI Base: 100 or 150
ATI Target: 500 – 1000
It is not assured that these settings will always set up the channels in the optimal region but it is
recommended to rather adjust the magnet’s position a little as this also influences the signal
received. If the magnet is too close to the IC the swing will be too large, and thus it is
recommended to increase the distance between the IC and the Magnet.
Copyright © Azoteq 2016
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IQS624 Datasheet v1.12
Page 62 of 62
January 2017
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