With the popularity of mobile devices, wearable devices, and interactive touch products, haptic feedback technology has become one of the key technologies to enhance user experience. Whether it's mobile phone vibration reminders, force feedback from game controllers, or simulated button touch on touchscreens, efficient and reliable tactile drivers are indispensable. CXHA31129 is a high-performance tactile feedback driver chip designed specifically for driving eccentric rotor motors (ERM), with outstanding features such as low latency, high efficiency, and wide voltage operating range. It is widely used in smartphones, tablets, touch pens, and other portable devices.
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[ CXHA31129 ]"
Introduction: The Importance of Tactile Feedback Technology and the Positioning of CXHA31129
With the popularity of mobile devices, wearable devices, and interactive touch products, haptic feedback technology has become one of the key technologies to enhance user experience. Whether it's mobile phone vibration reminders, force feedback from game controllers, or simulated button touch on touchscreens, efficient and reliable tactile drivers are indispensable. CXHA31129 is a high-performance tactile feedback driver chip designed specifically for driving eccentric rotor motors (ERM), with outstanding features such as low latency, high efficiency, and wide voltage operating range. It is widely used in smartphones, tablets, touch pens, and other portable devices.
1、 CXHA31129 Core Features Overview
CXHA31129 is a tactile drive solution with high integration and few external components. Its main features include:
1.1. Automatic input level conversionWithout the need for an external level conversion circuit, it is compatible with digital PWM signals ranging from 1.8V to 5V, ensuring output stability at different I/O levels.
1.2. Power supply voltage suppression functionEven when the battery voltage gradually decreases, it can maintain a constant vibration intensity without the need for an external voltage regulator and can be directly connected to the battery.
1.3. Wide voltage operating rangeSupports power supply voltages ranging from 2.7V to 5.2V, suitable for various battery types such as lithium-ion, lithium polymer, etc.
1.4. Full duty cycle controlSupports PWM duty cycle adjustment from 0% to 100%, enabling forward and reverse rotation and braking control to meet complex tactile mode requirements.
1.5. Low power consumption and high driving capabilityStatic current as low as 1.7mA, strong driving capability, can directly drive 8Ω Up to 20Ω The ERM motor.
1.6. Compact and compact packagingProvide SOT23-6 and DFN6 packaging forms, which occupy a small PCB area and are suitable for designs with limited space.
2、 Electrical characteristics and performance parameters
CXHA31129 performs well under recommended working conditions:
2.1. Working voltage：2.7V - 5.2V
2.2 PWM frequency range：10kHz - 250kHz
2.3. Output differential voltageUp to 3.3V (driving 20Ω); Load)
2.4. Excellent thermal resistance performance: Thermal resistance to the environmentθ Ja is 153.7° C/W， Top to top thermal resistanceθ JC (top) is 86° C/W
2.5 ESD protection：HBM ± 2kV，MM ± 500V， Having good anti-static ability
In addition, the chip also has over temperature protection and over-current protection functions, which can automatically turn off the output in abnormal situations, protecting the system and motor from damage.
2.6. Extreme working conditions
(1) Long term operation of chips under the above extreme parameter conditions may result in reduced device reliability or permanent damage, and is not recommended for actual use
Any parameter reaches or exceeds these limit values.
(2) All voltage values are tested relative to the system ground.
2.7. Electrical characteristics
3、 Function Explanation and Application Design
3.1. Power supply voltage suppression and vibration intensity stability
CXHA31129 achieves vibration intensity that does not fluctuate with battery voltage changes through an internal power feedback mechanism. This means that even if the battery level drops, the user experience remains consistent.
3.2. Edge Rate Control (ERC)
The output driver has edge rate control function, effectively suppressing electromagnetic interference (EMI) without the need for external filters or inductors, simplifying system design.
3.3. ERM Motor Drive and Braking
ERM motors are usually DC motors, and their speed is proportional to the voltage. CXHA31129 achieves forward and reverse control through differential output, and supports over drive and reverse braking to quickly start and stop the motor, avoiding vibration tailing phenomenon.
3.4. PWM control and GPIO compatibility
If the system does not have PWM output, the GPIO control chip can also be used to achieve switch mode control by outputting the maximum forward intensity at high levels and the maximum reverse intensity at low levels.
4、 Typical Application Circuit Design
The application circuit of CXHA31129 is extremely simple, requiring only one power decoupling capacitor to work. The following is a typical ERM driver circuit schematic:
Processor→ PWM/EN → CXHA31129 → ERM motor│└ - Cvdd (decoupling capacitor)
Attention should be paid to the following during design:
The power supply voltage should be at 2.7V– Between 5.2V;
The recommended load impedance is 8Ω – 20Ω；
It is recommended to set the PWM frequency at around 20kHz to avoid the audible range of the human ear.
5、 Packaging and mechanical specifications
CXHA31129 offers two types of packaging:
5.1.SOT23-6Suitable for traditional surface mount technology, easy to weld and detect;
5.2.DFN6Smaller size, better thermal performance, suitable for high-density wiring design.
Please refer to the mechanical drawings in the data manual for packaging dimensions. It is recommended to pay attention to heat dissipation and signal integrity during PCB layout.
6、 Parameter measurement:
6.1. Test setup diagram:The output waveform of CXHA31129 can be viewed by connecting to an oscilloscope.
6.2. Function Description
CXHA31129 It has power feedback, so there is no need for external power regulation. If the power supply voltage changes over time (for example, due to electricity)
As long as there is sufficient power supply voltage to maintain the required output voltage, the vibration intensity will remain unchanged. CXHA31129 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.
6.2.2) Over temperature and over-current protection
CXHA31129 When the chip is protected against overheating, the device will be turned off to prevent internal overheating. Please refer to the electrical specification table for typical overheating thresholds. simultaneously
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.
6.2.3) Edge rate control
The CXHA31129 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.
6.2.4) Eccentric Rotor Motor (ERM)
Eccentric rotor motors, also known as ERMs, are typically rod-shaped or coin shaped motors controlled by DC. According to the polarity of the voltage at both ends, it can be
Drive ERM clockwise or counterclockwise. In a single power supply system, bidirectional driving is possible, and differential output can improve performance
Supply and absorb electrical current. This feature helps eliminate unwanted long vibration tails in tactile feedback systems.
Another common method for driving a DC motor is the concept of overvoltage. In order to overcome the inertia of motor mass, they usually
Overdriven for a short period of time, then returned to the rated voltage of the motor to maintain its rotation. Reverse overdrive is achieved by reversing the magnetic field of the driving coil
Quickly brake ERM motor on site.
The CXHA31129 chip is used to drive ERM motors for tactile feedback. ERM can be used for many tactile feedback applications, including vibration alarms, advanced vibrations for touch surface or screen communication, button replacement, and tactile feedback.
The output of CXHA31129 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.
If the PWM port is unavailable, CXHA31129; The PWM pin can be controlled using GPIO; At this point, CXHA31129 will only function as a switch. When GPIO is high, the output is 100%; When GPIO is low, the output is -100% (opposite direction).
The CXHA31129 chip provides a compact, low-cost ERM motor drive solution. Most competitive solutions require external components for bias or level shifting, but CXHA31129 only requires one decoupling capacitor, with a total approximate circuit size of 2 millimeters; 2 millimeters. This small solution features level conversion input, braking differential output, constant overvoltage driving strength, edge rate control, and wide output
Characteristics such as entering the PWM frequency range.
CXHA31129 Adopting a simple control scheme. 100% input duty cycle provides maximum forward rotation intensity, 50% input duty cycle does not provide rotation intensity, and 0% duty cycle provides maximum reverse rotation intensity. In the ERMs system, the motor speed is used for reverse rotation to achieve the motor
Braking. At different times and with different duty cycles, the output terminal will generate tactile motor control signals to accurately drive the motor.
When the differential voltage seen at the output terminal is 3.3V, when driving 10Ω When ERM is used, the output voltage is about 3V. The output voltage and input are shown in the figure
The functional relationship of the air ratio is shown in the following formula.
The following figure shows the ERM application configuration.
6.3.3）Detailed design steps
6.3.3.1) Driver selection
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.
1. Find the rated/maximum operating voltage in the driver data table; Some drive data sheets may only list the rated voltage.
2. Using 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. Check 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.
6.3.3.2）Power supply selection
CXHA31129 supports power supply voltages from 2.7V to 5.2V. CXHA31129 can be directly connected to various types of batteries, including regular batteries such as lithium-ion and lithium polymer. The power suppression feature eliminates the need for a voltage regulator between the battery and VDD in CXHA31129.
6.3.3.3) Sending haptic effects
Sending tactile effects with CXHA31129 is very simple. The optimal performance can be achieved through the following steps.
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.
2. 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 ERM, users should be careful not to brake the driver for too long, otherwise it may cause damage
Can generate reverse rotation.
sevenSummary: Market advantages and application prospects of CXHA31129
CXHA31129 is an ideal choice for the tactile feedback driver market due to its high integration, low external component requirements, excellent power suppression capability, and wide voltage adaptability. Especially suitable for portable device designs with strict requirements for power consumption, size, and cost.
In the future, with the increasing demand for tactile feedback in scenarios such as AR/VR, smart homes, and in car interaction, CXHA31129 and its subsequent products will continue to play an important role in promoting the development of tactile technology towards higher efficiency and intelligence.
8 Related Products
| sensor | |||||
| model | detection method | detection distance | Output configuration | Drive Type | remark |
| CXHA31125 | Light blocking groove type | 5mm (slot width) | The light blocking indicator can be turned on through the portLConnect to（+）When selecting transparency, the indicator light is on | NPN | photoelectric sensor |
| CXHA31125A | Light blocking groove type | 5mm (slot width) | The light blocking indicator can be turned on by connecting port L (+) to select the light transmitting indicator | NPN | photoelectric sensor |
| CXHA31125B | Light blocking groove type | 5mm (slot width) | The light blocking indicator can be turned on by connecting port L (+) to select the light transmitting indicator | NPN | photoelectric sensor |
| 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 |
