Boréas Technologies

Piezo Haptic Driver


BOS1901
The BOS1901 is a single-chip piezo actuator driver with energy recovery, based on Boréas' patented CapDrive™ technology. It can drive actuators with up to 190 Vpk-pk waveforms while operating from a 3-5.5 V supply voltage. The input digital stream is written in the internal FIFO over the digital interface to generate the desired output waveform. Low power and small size make it suitable in a variety of applications where power consumption and heat dissipation must be minimized.
Piezo Haptic Driver
BOS1901 INTRO
The BOS1901 is a single-chip piezo actuator driver with energy recovery, based on Boréas' patented CapDrive™ technology. It can drive actuators with up to 190 Vpk-pk waveforms while operating from a 3-5.5 V supply voltage. The input digital stream is written in the internal FIFO over the digital interface to generate the desired output waveform. Low power and small size make it suitable in a variety of applications where power consumption and heat dissipation must be minimized.

The BOS1901 uses a high-speed SPI in its Digital Front End. It enables the device to share a common communication bus for multi-actuator systems and the user to query various data such as the actuator voltage for sensing applications.

The differential driver achieves low distortion waveforms and quiet actuator operation. All settings are adjustable through the digital front end to reduce the BOM. Only 7 passive discrete components are required. The BOS1901 can be operated with a wide selection of commercial off-the-shelf inductors.
In systems that can’t handle reverse current flow in the power delivery network, the BOS1901 features a unidirectional power input (UPI). When the UPI mode is activated, the driver behaves as a resistive load without reducing power efficiency.

Typical start-up time of less than 300 µs makes the BOS1901 latency insignificant in most systems. Safety systems protect the device from damage in case of a fault.

TYPICAL APPLICATIONS 
  • Mobile Devices
  • Wearables
  • Keyboard and Mice
  • Laptop Computer
  • Gaming
  • Cooling

KEY FEATURES 
- High-Voltage Low Power Piezo Driver
  • Drives 100 nF at 190 Vpk-pk and 300 Hz with only 350 mW
  • Drives Capacitive Load up to 820 nF
  • Energy Recovery
  • Differential Output
  • Miniature Solution Footprint, WLCSP 2.1x2.2 mm
  • Small Solution Footprint, QFN 4x4 mm
  • Low BOM cost
- Integrated Digital Front End with SPI
  • 64 samples Internal FIFO Interface
  • 1.8 V to 5.0 V Digital I/O Supply
- Piezo Sensing
- Fast Start Up Time, < 300 µs
- Unidirectional Power Input option
- Wide Supply Voltage Range, 3 to 5.5 V

 
Boréas Piezo Haptic Engine Technology

The LRA is History. Welcome Piezo Haptics!
The Linear Resonant Actuator (LRA) represented the gold standard in haptics for mobile and wearable devices. The truth is, the LRA performance peaked and is now limiting haptic experiences. Interaction designers need new technologies to unlock the next generation of haptic effects.
Enters the Boréas Piezo Haptic Engine (Boréas PHE). Our new innovative piezo haptic engine enables rich and highly detailed haptic effects that are not possible to create with legacy technologies.
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How it works 
Punching Above Its (Internal) Weight
The Boréas Piezo Haptic Engine's innovative design uses internal components' mass to generate haptics while reducing the solution's size. Using off-the-shelf piezo actuators, the Boréas PHE enables a new generation of consumer electronics haptics.
Internal components in a mobile or wearable device represents a significant part of the device's total weight. Therefore, using a small piezo actuator to vibrate internal mass creates more forceful feedback than a similar-sized LRA or ERM.

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Next wave of haptic experience
Your User Aren't Accelerometers
Using an accelerometer to find your actuator's resonant frequency for the most effective haptic feedback is logical, but it doesn't necessarily translate into pleasant haptic feelings. The human skin has different mechanoreceptors that sense different frequencies. High frequencies can translate into unpleasant haptics and make your device feel cheap like it is usually the case with small wearable devices. The Boréas Piezo Haptic Engine generates strong haptics on a large frequency bandwidth in a small volume. Perfect to craft enjoyable haptic experiences and give your electronic device a premium feel.

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Mechanical Fundamentals of Piezo Haptic Actuators

Piezo haptics operates under a different mechanical concept than legacy technologies and will need a different approach to achieve a successful integration with better tactile effects. Let's see how piezo haptics differentiate themselves from ERMs and LRAs and how it will impact their integration.

You'll learn in this video:
1. Mechanical fundamentals of ERM, LRA, and piezo actuators
2. Isaac Newton's laws of motion and their impact in haptics
3. How actuator's performance is measured
4. How to take advantage of piezo haptics hardware flexibility

*Boréas Technologies Authorized Distributor
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