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ProxFusion click
PID: MIKROE-2920
Weight: 23 g
ProxFusion click is a multifunctional
capacitive and Hall-effect sensor
device. This click can detect touch by
using two onboard sensor pads, and it
can sense a rotation angle of a
magnetic field, parallel with the
surface of the click board™. The
intelligent onboard IC calculates all the
parameters and streams the current
angle value to the I2C bus directly,
without the need for extra
calculations.
The integrated circuit, used on
ProxFusion click, allows a minimal
number of external components, thus
allowing the ProxFusion click to work
with a very low power consumption.
The compact size and advanced
onboard functions make this click an
ideal solution for implementing all
kinds of advanced HMI interfaces,
wearable devices, proximity activated
or dimmed TFT backlight, digital angle
gauges, and similar applications that
include any kind of capacitive
proximity/touch and Hall-effect
sensing elements.
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Table of contents
1. How does it work?
2. Specifications
3. Pinout diagram
4. ProxFusion click electrical
specifications
5. Onboard settings and
indicators
6. Software support
7. mikroSDK
8. Downloads
ProxFusion click is a multifunctional capacitive and Hall-effect sensor
device. This click can detect touch by using two onboard sensor pads, and it
can sense a rotation angle of a magnetic field, parallel with the surface of the
click board™. The intelligent onboard IC calculates all the parameters and
streams the current angle value to the I2C bus directly, without the need for
extra calculations.
The integrated circuit, used on ProxFusion click, allows a minimal number of
external components, thus allowing the ProxFusion click to work with a very
low power consumption. The compact size and advanced onboard functions
make this click an ideal solution for implementing all kinds of advanced HMI
interfaces, wearable devices, proximity activated or dimmed TFT backlight,
digital angle gauges, and similar applications that include any kind of
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capacitive proximity/touch and Hall-effect sensing elements.
How does it work?
ProxFusion click carries the IQS624, a combined multi-sensor IC from Azoteq,
including Hall-effect rotation sensing, along with dual channel capacitive
proximity or touch sensing, or single-channel inductive sensing. This IC
features the proven ProxSense® engine and it has many on-chip features
that are used to process the sensor data, such as calculated angle rotation
with 1° precision, Automatic Tuning Implementation (ATI), relative rotation
angle, etc. All these functions are used to process the sensor data, before
the final result is sent to the output, in human understandable format.
Besides these processed values, the IQS624 is capable of sending raw values
on the output too, so that the external processing can be applied.
The design of the board is reasonably simple since the IC encompasses all
the required components on the chip. The I2C bus lines are pulled up to 3.3V
with the resistors, as well as the RDY pin from the IC, routed to the INT pin of
the mikroBUS™. This pin can be used to report an event, when the device is
set to work in the event mode, via I2C. Otherwise, this pin is used to indicate
a communication window. After the host MCU initializes the communication
by sending the valid I2C address of the IQS624 IC, it will respond with the ACK
signal and the RDY pin will be pulled to a LOW logic state, to indicate an open
communication window. I2C features a time-out that will reset the
communication bus and the RDY pin, allowing MCU to use interrupts and
break the I2C ACK signal polling loop.
The capacitive touch sensing is accomplished by two onboard pads, that are
routed to two internal channels of the IQS624 sensor IC. All the calibration
can be automatically done by writing to the corresponding ATI registers.
This group of registers also contain settings for the capacitive touch
threshold, the proximity threshold, as well as some additional general
configuration settings for these sensors. Both of these channels can be
configured independently.
The rest four channels of the IQS624 sensor are routed to the outputs of
two on-chip Hall plates, used to detect a magnetic field rotation. The Hall-
effect magnetic field measurement is basically a measurement of the
current through the Hall-effect sensor plates, generated by the magnetic
field that penetrates through each plate, perpendicularly. The channels 2
and 4 are used to measure positive direction while the channels 3 and 5 are
used to measure negative direction. The IC can use the differential data to
provide the angle of the Hall-effect rotation UI element - or a magnet
rotation angle, parallel to the click board™ surface. The raw input from the
sensors is processed so it outputs a comprehensible information at the
output. Corresponding registers can be set to both configure and receive
the data from Hall-effect sensors.
The working frequency of the device is 16MHz and the maximum I2C clock
speed is 400kHz. ProxFusion click can be set to work in several different
power saving modes, depending on the design requirements. As explained
above, the event mode can be set within the configuration registers.
Otherwise, streaming mode is active by default and the information can be
obtained whenever the RDY is triggered.
Specifications
Type Capacitive,Hall effect
Applications
An ideal solution for implementing all kinds of
advanced HMI interfaces, wearable devices,
proximity activated or dimmed TFT backlight,
digital angle gauges, etc.
On-board modules
IQS624, a combined multi-sensor IC from Azoteq,
including Hall-effect rotation sensing, along with
dual channel capacitive proximity or touch
sensing, or single-channel inductive sensing
Key Features
Low power consumption, compact size,
ProxFusion™ sensor series featuring the proven
ProxSense® engine.
Interface GPIO,I2C
Input Voltage 3.3V
Click board size M (42.9 x 25.4 mm)
Pinout diagram
This table shows how the pinout on ProxFusion click corresponds to the
pinout on the mikroBUS™ socket (the latter shown in the two middle
columns).
Notes Pin Pin Notes
AN 1AN PWM 16 NC
EN 2RST INT 15 INT RDY indicator
CS 3CS RX 14 NC
SCK 4SCK TX 13 NC
NC 5MISO SCL 12 SCL I2C Clock
SDI 6MOSI SDA 11 SDA I2C Data
Power Supply 3V3 73.3V 5V 10 NC
Ground GND 8GND GND 9GND Ground
ProxFusion click electrical specifications
Description Min Typ Max Unit
Maximum continuous current 10 mA
ESD protection ±4 kV
Operating temperature -20 85 ℃
Onboard settings and indicators
Label Name Default Description
LD1 PWR -Power LED indicator
Software support
We provide a library for ProxFusion click on our Libstock page, as well as a
demo application (example), developed using MikroElektronika compilers
and mikroSDK. The provided click library is mikroSDK standard compliant.
The demo application can run on all the main MikroElektronika development
boards.
Library description
Key functions
void proxfusion_systemSetting(uint8_t value) - Sets up system settings
uint8_t proxfusion_Touch() - Reads info about the touch
uint16_t proxfusion_getTemperature() - Reads current temperature
The application is composed of three sections :
System Initialization - Initializes I2C module and UART for info logging.
Application Initialization - Driver intialization and ProxFusion mode
setup.
Application Task - (code snippet) - Writes information about the last
detected touch.
void applicationTask()
{
touch = proxfusion_Touch();
if( touch == 1 )
mikrobus_logWrite("Touch 1",_LOG_LINE);
if( touch == 2 )
mikrobus_logWrite("Touch 2",_LOG_LINE);
if ( touch == 3 )
mikrobus_logWrite("Touch antenna",_LOG_LINE);
Delay_100ms();
}
The full application code, and ready to use projects can be found on our
Libstock page.
PRODUCTS IN THE SAME CATEGORY
Other MikroElektronika Libraries used in the example:
I2C
UART
Additional notes and information
Depending on the development board you are using, you may need USB
UART click, USB UART 2 click or RS232 click to connect to your PC, for
development systems with no UART to USB interface available on the board.
The terminal available in all MikroElektronika compilers, or any other
terminal application of your choice, can be used to read the message.
mikroSDK
This click board is supported with mikroSDK - MikroElektronika Software
Development Kit. To ensure proper operation of the mikroSDK compliant
click board demo applications, mikroSDK should be downloaded from the
LibStock and installed for the compiler you are using.
For more information about mikroSDK, visit the official page.
Downloads
mikroBUS™ standard specifications
Libstock: ProxFusion click library
Libstock: mikroSDK
IQS624 datasheet
ProxFusion click - 2D and 3D files
ProxFusion click schematic
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