In today's portable devices such as smartphones, tablets, and various touch devices, haptic feedback technology plays an increasingly important role. CXHA31130 is a high-performance tactile feedback driver chip designed specifically for driving linear vibration motors (LRAs), with outstanding features such as automatic resonance tracking, power supply voltage suppression, low power consumption, and high integration. It is widely used in mobile terminals, game controllers, wearable devices, and other products.
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[ CXHA31130 ]"
CXHA31130 haptic feedback driver: a complete solution for efficiently driving linear vibration motors
In today's portable devices such as smartphones, tablets, and various touch devices, haptic feedback technology plays an increasingly important role. CXHA31130 is a high-performance tactile feedback driver chip designed specifically for driving linear vibration motors (LRAs), with outstanding features such as automatic resonance tracking, power supply voltage suppression, low power consumption, and high integration. It is widely used in mobile terminals, game controllers, wearable devices, and other products.
One Main features and advantages
CXHA31130 effectively solves the problem of narrow frequency band and susceptibility to environmental influences in LRA drivers through its advanced automatic resonance tracking technology. The chip is capable of automatically identifying and tracking the optimal resonant frequency of the LRA (usually between 140Hz and 220Hz) within the input PWM frequency range of 10kHz to 250kHz, ensuring that the vibration intensity remains optimal at all times. In addition, its built-in braking algorithm can quickly suppress residual vibrations and provide a clean and clear tactile feedback experience.
The device also has a power supply voltage suppression function, which can operate stably in a wide voltage range of 2.7V to 5.2V without the need for an external voltage regulator circuit, and can be directly connected to a battery power supply system. The digital input pins are compatible with 1.8V and 5V logic levels, and support PWM duty cycle adjustment from 0% to 100%, enabling users to achieve various complex tactile effects such as clicks, vibrations, pulses, etc.
1.1.Flexible Touch Feedback/Libra Driver;
1.1.1) LRA (Linear Vibration Motor)
1.2.Automatic resonance tracking for LRA
1.2.1.No frequency calibration required
1.2.2.Automatic drive reversing
1.2.3.Automatic braking algorithm
1.2.4.Wide input pulse width modulation (PWM) frequency range
1.3.Continuous vibration intensity exceeds the supply range
1.4.Automatic input level conversion
1.5.0% to 100% duty cycle control range
1.6.Wide power supply voltage range from 2.7V to 5.2V
1.7.1.8V compatible, 5V tolerance digital pin
1.8.Packaging form: SOT23-6, DFN6LE
1.9.Application areas: Mobile phones, tablets, touch enabled devices
II Electrical characteristics and packaging
CXHA31130 offers two packaging options, SOT23-6 and DFN6LE, with low static current (typical value 1.7mA) and extremely low turn off current (0.3μ A), making it ideal for battery powered devices. It integrates overheat protection and overcurrent protection mechanisms internally, which can effectively prevent device damage caused by short circuits or overloads.
Under recommended working conditions, the chip can drive 8Ω Up to 25Ω The LRA load can output a differential voltage of up to 2.2V RMS, ensuring strong tactile feedback effect. Its thermal resistance parameters are excellent, with a junction temperature range of -40 ℃ to 150 ℃, suitable for harsh working environments.
2.1. Extreme working conditions
(1) If the chip operates for a long time under the above extreme parameter conditions, it may cause a decrease in device reliability or permanent damage
When any parameter reaches or exceeds these limit values in actual use.
(2) All voltage values are tested relative to the system ground.
2.2. Recommended working conditions
2.3. Electrical characteristics
2.4. Encapsulation
III Application design suggestions
CXHA31130 is very suitable for use in devices such as mobile phones, tablets, touch pens, game controllers, etc. When designing, the following points should be noted:
3.1. Driver selectionThe appropriate LRA driver should be selected based on factors such as vibration intensity, power consumption, size, and cost.
Choosing a driver should consider many factors, including cost, shape factor, vibration intensity, power consumption requirements, tactile acuity, reliability, and more
Audible noise performance. The selection of drivers is one of the most important design considerations for tactile systems, so drivers should be the first in the design process
Components to be considered in a unified manner. The following can be used to select the minimum required supply voltage.
3.1.1Find the rated/maximum operating voltage in the driver data table; Some drive data sheets may only list the rated voltage.
3.1.2Using a larger rated value and maximum operating voltage plus 250MV is the minimum operating voltage. Add 250MV to increase internal driver loss
Provided operational margin.
3.1.3Check the power supply voltage to ensure the expected output is achieved. It is also necessary to calculate the minimum power supply current based on the load. Comparing batteries or voltage drives
Dynamic capability to ensure sufficient power to drive the load in the driver data table.
3.2. Power Supply DesignThe chip can be directly connected to lithium-ion or lithium polymer batteries, utilizing its power suppression characteristics to eliminate voltage stabilizing components such as LDO.
The CXHA31130 supports power supply voltages ranging from 2.7V to 5.2V. The CXHA31130 can be directly connected to various types of batteries, including regular batteries,
Such as lithium ions and lithium polymers. The power suppression feature eliminates the need for a voltage regulator between the battery and VDD in CXHA31130.
3.3. Touch effect controlBy controlling the vibration intensity and mode through PWM signals, it is recommended to set the driving time between 20ms and 50ms, set the duty cycle to 0% during braking, and maintain EN at a high level. Sending tactile effects with CXHA31130 is very simple. The optimal performance can be achieved through the following steps.
3.3.1) At or near the same time, the EN pin is pulled high and the PWM input waveform is generated. Usually within 20 milliseconds to 50 milliseconds of instantaneous driving, the driver
Generate tactile effects. Refer to the specifications of the driver to obtain the best overdrive characteristics.
When the tactile effect is completed, if braking is required, set the PWM duty cycle to 0% and keep the EN pin high. When the braking is completed
Set the EN pin to low to end the tactile effect. When braking the LRA, the automatic resonance engine will automatically drive the driver to zero vibration
There will be no obvious reverse vibration.
4 parameter measurement
4.1 Test setup diagram
In order to measure or observe the basic driving components, a low-pass filter must be used to eliminate them; PWM component. The digital filtering function of a digital oscilloscope is
Used in other typical digital oscilloscopes. It is recommended to use a first-order low-pass filter between 1 kHz and 3.5 kHz. If there is no digital filter
The digital oscilloscope of the wave can be replaced by a first-order low-pass RC filtering network, as shown in the dashed box in Figure 2. Be careful not to use a filter impedance that is too low
Resistance. This will interfere with the back electromotive force of the driver and disrupt the operation of the automatic resonance function.
As long as there is sufficient power supply voltage to maintain the required output voltage, the vibration intensity will remain unchanged. CXHA31130 Can be straight
Connect to the battery. As long as the input voltage of the PWM port meets the VIH and VIL levels, even if the digital levels are different, the vibration intensity will remain constant
Change.
It also has overcurrent protection to prevent damage under short-circuit conditions. This overcurrent protection monitors the current from; VDD, GND, OUT+and
OUT-。 Please refer to the electrical specification table for typical overcurrent thresholds.
4.2.3) Edge rate control
The CXHA31130 output driver implements edge rate control (Erc). This ensures that the rising and falling characteristics of the output driver are not released
Can interfere with the radiation level of other circuits in mobile and portable platforms. Due to ErC, no output filters or inductors are required.
4.2.4.) Range of automatic resonance tracking
Linear vibration motors, also known as LRAs, only vibrate effectively at their resonant frequency. LRAs have high-precision frequency response characteristics and deviation response
When the frequency is between 2 and 3 hertz, the vibration performance sharply decreases. Many factors can cause changes or drift in the resonant frequency of the driver, such as temperature, aging, etc
The quality of products installed with LRAs and the way they are fixed in portable products. In addition, when the driver is driven to its maximum allowable power
During compression, many LRAs will shift in frequency by a few hertz due to mechanical compression. All these factors are real-time. Tracking self resonance algorithm
It is crucial to drive LRAs to achieve consistent and optimized performance. CXHA31130 self resonant driver tracks the resonance frequency of LRA in real-time
Rate. If the resonant frequency shifts in the middle of the waveform of a certain factor, the driver will track its period. The automatic resonance engine is continuously monitored
The back electromotive force of the LRA is used to achieve this. The frequency tracking range of CXHA31130 is from 140 Hz to 220 Hz.
4.3. Application Information
The CXHA31130 chip is used to drive the LRA motor for tactile feedback. The LRA driver can be used for many tactile feedback applications, including vibration alarms
The CXHA31130 output is controlled by PWM input. The duty cycle of PWM determines the amplitude of the output waveform. By changing the duty cycle, it is possible to create
Advanced tactile modes and programs, such as clicks, bumps, pulses, slopes, and more. 100% input duty cycle provides the strongest vibration intensity,
The vibration intensity of the input duty cycle from 0% to 50% is 0. The automatic resonance detection algorithm is responsible for the rectification of physical layer signals and linear vibration motors.
CXHA31130 Closed loop operation was achieved through a simple feedback loop. If the back electromotive force feedback tells the device that the vibration input duty cycle is relatively low
CXHA31130 will increase vibration intensity. If the feedback of the back electromotive force tells the device that the vibration of the phase input duty cycle is too high, CXHA31130 will automatically force
Execute the braking algorithm. When the input duty cycle is between 0% and 50%, the chip will always force braking until the LRA no longer vibrates.
Power, while others; The LRA device provides a greater back electromotive force. The nominal full-scale output value is; 2.2 VRMS， But it can usually vary by+/-10%
Transformation depends on the physical design of the executing mechanism. When the input duty cycle is between 50% and 100%, the output voltage can be approximately calculated using the following formula:
The above formulas are correct.
If the PWM port is unavailable, CXHA31130; The PWM pin can be controlled using GPIO; At this point, CXHA31130 will only function as a switch.
In LRA mode, when GPIO is high, the output is 100%. When GPIO is low, the driver program will automatically brake to stop the motor from vibrating.
Conclusion
CXHA31130 is an ideal choice for achieving high-quality tactile feedback in modern portable devices due to its high integration, low power consumption, strong driving capability, and good compatibility. Its automatic resonance tracking and intelligent braking algorithms significantly enhance the user experience, while wide voltage support and multiple protection mechanisms ensure the reliability and stability of the system. Whether it is consumer electronics or industrial touch devices, CXHA31130 can provide excellent vibration drive solutions.
Related Products
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| model | detection method | detection distance | Output configuration | Drive Type | remark |
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| model | Working Voltage | Port withstand voltage | PWM cycle | package form | |
| CXHA31126 | 2.4V-5V | 6V | 6.13ms | SOT23-5 | vibration sensor |
| CXHA31127 | 2.4V-5V | 6V | 4.87ms | SOT23-5 | vibration sensor |
| CXHA31128 | 2.8V-9.5V | - | - | SOP8/SOT23-6 | vibration sensor |
| CXHA31129 | 2.7V-5.2V | - | Adjustable duty cycle | SOT23-6/DFN6H | vibration sensor |
| CXHA31130 | 2.7V-5.2V | - | Frequency adjustable | SOT23-6/DFN6H | vibration sensor |
| CXHA31131 | 2.7V-5.2V | - | I2C control | MSOP10/SSOP10/QFN3*3 | vibration sensor |
| model | Working Voltage | Number of interfaces | Number of driving buttons | package form | |
| CXHA31132 | 2.2V-5.5V | twoThefour | eight | SOP16 | Touch sensor |
| CXHA31132S | 2.2V-5.5V | two | 8 (Supports slider function) | SOP16 | Touch sensor |
| CXHA31133 | 2.2V-5.5V | two | eight | SOP16 | Touch sensor |
| CXHA31134 | 2.8V-3.6V | four | twenty-eight | QFN40 | Touch sensor |
| CXHA31135 | 2.8V-3.6V | four | thirty-six | QFN48 | Touch sensor |
