Boosted Haptic Drivers with Integrated DSP, Waveform Memory, Closed‑Loop Algorithms and LRA/VCM Protection
The CS40L25 / CS40L25B family of haptic drivers integrate a self-contained haptic signal generator with the Cirrus Logic Halo Core™ DSP. Both hardware and signal processing are resonance-aware and designed specifically for optimal drive of highly-resonant LRAs or VCMs for switch-replacement and gaming applications. A Class D driver provides an advanced closed-loop architecture for superior power supply rejection ratio and a complementary output stage, while a digitally controlled voltage boost converter driver extends battery voltages up to 11 volts. The elevated VBST supply allows these devices to deliver up to 5.3 watts into a 6 Ω load at one percent THD+N. The CS40L25 supports basic haptics mode on hardware platforms with one GPI using the I2S interface. The CS40L25B supports hardware platforms using four GPI input pins.
CIRRUS ROCKS® CIRRUS® ENGINEERED TO ROCK® INNOVATION THAT ROCKS®
Technology
Features
- 11 V amplifier supply voltage MAX for fast startup and braking
- Short circuit protection
- Compatible with LRA impedances as low as 6 Ω
- Class D architecture with adaptive output stage reduces idle power consumption, switching loses
- Run real-time algorithms with reduced latency and reduced integration effort
- Larger memory for more haptic effects
- Eliminate complicated integration across platforms for running Audio-2-Haptics
- 85% overall efficiency boost
- Programmable boost voltages up to 11 V
- High bandwidth digital control loop
- 2 MHz switching frequency
- Pulse skipping mode for improved efficiency during low power quiescent operation
- Always-on listening to haptic trigger
- Reduce time from trigger to achieving desired acceleration on the LRA
- Wakeup from AoH hibernate mode in 5 ms
- < 20 μA AoH hibernation
- Provides performance consistency over voltage, temperature and external factors
- No loss of acceleration strength of the LRA
- Can overdrive the motor for strong performance
- Stopping the LRA immediately for crisp haptics with no ringing/buzzy effects
- Button replacement to enable new user experiences
- Localized haptics
- Almost like plug and play
- Algorithms dynamically handle changes in actuator characteristics to eliminate the need to fine tune for long hours
Parametric Specifications
| Description | Haptic DSP + Boost Class D Amplifier |
| Digital Power Supply (V) | 1.8 |
| 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 - +85 |
| Max Boost Converter Voltage (V) | 11 |
| GPI Iputs | 1 (with I2S/TDM), 3 (w/o I2S/TDM) (CS40L25) 4 (CS40L25B) |
| Package | 30-ball WLCSP (CS40L25) 30-ball WLCSP Or 32-pin QFN (CS40L25B) |
