Product Bulletin
CS40L25-25B Product Bulletin
340 KBApril 2020
NRND
Haptic DriversCS40L25/25B
Boosted Haptic Drivers with Integrated DSP, Waveform Memory, Closed-Loop Algorithms and LRA/VCM Protection
CS40L25/25B Overview
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®
CIRRUS ROCKS®
ENGINEERED TO ROCK®
INNOVATION THAT ROCKS®
Product Features
Haptic driver
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
Programmable DSP
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
Class H digital boost converter
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
Low latency for real-time control of the haptic motor
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
Crisp, clean haptic performance
Can overdrive the motor for strong performance
Stopping the LRA immediately for crisp haptics with no ringing/buzzy effects
Closed-loop control for strong haptic effects and force-sensitive interface
Button replacement to enable new user experiences
Localized haptics
Simplified tuning
Almost like plug and play
Algorithms dynamically handle changes in actuator characteristics to eliminate the need to fine tune for long hours