Advanced Haptic Driver with Waveform Memory, Integrated DSP, Closed-Loop Actuator Control Algorithms, and Actuator Excursion Protection
The CS40L27R integrates a self-contained haptic signal generator and driver optimized for high performance haptics in button-replacement type configurations and gaming applications with advanced closed-loop control. Hardware and digital signal processing are resonance-aware and designed specifically for optimal drive of highly-resonant linear resonant actuators (LRAs) and voice coil motors (VCMs). There are banks of waveforms stored in ROM to match the LRA characteristics. The CS40L27R supports low power Standby and Hibernate Modes with fast wake upon GPI enable, always-available operation. The device integrates a high performance haptic driver, Halo Core DSP, and driver voltage boost converter. The integrated DSP executes all haptic algorithms. The device supports full haptics functionality at power-on with default settings that may be updated by the host. The CS40L27R supports hardware platforms with one GPI using the I2S interface.
The Class D driver features an advanced closed-loop architecture providing superior power supply rejection ratio (PSRR) and a complementary output stage. The digitally controlled boost converter boosts standard-voltage lithium-ion and lithium-polymer battery voltages up to 11 V. The elevated VBST supply generated by the boost converter allows the CS40L27R to deliver up to 7.9 Vpk into an 8 Ω load.
The CS40L27R includes self-protection and system-protection features. The boost and driver stages are protected against short circuits. IC overtemperature shutdown protection is provided in hardware. The supply voltage is continuously monitored. The boost converter and driver gains are automatically adjusted to preserve the supply voltage according to programmable voltage/current load-shedding set-points. The supply voltage protection adjustment of the driver is integrated with the IC thermal protection, ensuring seamless coordination of gain rollback if necessary.
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Technology
Features
- Sensorless Velocity Control (SVC) for LRA fast start / stop and acceleration control without a Hall Sensor
- LRA Excursion Protection
- LRA Thermal Protection
- Real-time Resonance (F0) Tracking
- On-chip wavetable (waveform memory)
- Haptics Streaming over I2C and TDM / I2S
- Waveform trigger via I2C, SPI, GPIO, or streaming interface
Parametric Specifications
| Description | Haptic DSP with On-chip ROM inc. Power-On Buzz, RAM Download Firmware, Streaming Haptics (I2S), and Boosted Amplifier with Programmable Output up to 11.0 V |
| Digital Power Supply (V) | 1.2 |
| Boosted Amplifier Digital Power Supply (V) | 2.5-5.5 |
| Output Power (W) @1% THD+N, into 6 ohm | 5.3 |
| Operating Temperature Range (°C) | -40 to +85 |
| Max Boost Converter Voltage (V) | 11 |
| GPI Iputs |
1 (with I2S/TDM); 3 (w/o I2S/TDM) |
| Package | 30-ball WLCSP |
