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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DA7282-00FVC датащи(PDF) 39 Page - Renesas Technology Corp |
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DA7282-00FVC датащи(HTML) 39 Page - Renesas Technology Corp |
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39 / 75 page  LRA/ERM Ultra-Low Power Haptic Driver with Multiple Input Triggers and Integrated Waveform Memory R15DS0041EE0330 Rev.3.30 June 16, 2026 CFR0011-120-00 Page 39 6.7.14 BEMF Fault Limit To detect malfunctioning actuators that have stopped moving due to a mechanical fault, DA7282 can be configured to trigger an actuator fault if the BEMF voltage level falls below a threshold for long drive durations. The threshold for detection is set in BEMF_FAULT_LIM; a zero value of the register disables the fault checking. 6.7.15 Increasing Impedance Detection Accuracy To increase the accuracy of the impedance reading in IMPEDANCE_H and IMPEDANCE_L, the register V2I_FACTOR_OFFSET_EN could be set to 0. This removes an algorithmic offset utilized by the acceleration algorithm. Should V2I_FACTOR_OFFSET_EN be equal to 0, ACCELERATION_EN is recommended to be set to 0. 6.7.16 Frequency Pause during Rapid Stop To address low mechanical time constant LRAs (start/stop times less than 20 ms) and improve the braking behavior, DA7282 has the option to pause frequency tracking during the execution of the Rapid Stop algorithm by setting FRQ_PAUSE_ON_POLARITY_CHANGE to 1. 6.7.17 Frequency Pause during Rapid Stop If DA7282 is used with LRAs that have significant BEMF voltage amplitude that can transiently exceed the IR drop across an actuator when reversing the phase of the drive signal, it is recommended to set DELAY_BYPASS to 0. 6.7.18 Coin ERM Operation The term coin ERM is used to describe an eccentric rotating mass actuator that is flat and has coin-like external appearance. The eccentric rotating mass is circular and contains two coil windings that are used for commutation, see Figure 23. INN INP Plan View Elevation View Case Case Rotor Top Rotor Rotor Bottom Stator Coils Commutator PCB Stator Magnet Brushes Shaft Electrical Commutation 1 2 A A’ B B’ C C’ Commutator PCB Electrical Diagram A A’ B B’ C C’ 1 2 A A’ B B’ C C’ Commutation Event 1: Single Inductor 1 2 A A’ B B’ C C’ Commutation Event 2: Double Inductor VOUT Constant Current Driven System Time [s] VOUT Coil 1 in series with Coil 2 Coil 1 or Coil 2 View w/o Case Rotor Stator Coil 1 and 2 in parallel 1 2 A A’ B B’ C C’ Commutation Event 3: Parallel Inductors Figure 23. Coin ERM physical and electrical summary Due to the commutation of the motor, the impedance varies between one coil, two coils in series, and for very short periods two coils in parallel. Due to this behavior, DA7282 cannot extract the BEMF and actuator motion is not detectable for coin ERM actuators. Therefore, Active Acceleration and Rapid Stop features are not available. Manual overdrive or underdrive of the coin ERM to speed up the transition between two levels of acceleration is possible and recommended for better user experience. Note that due to the varying impedance and the constant current drive of DA7282, the output voltage will vary, with no effect on the performance of the DA7282, see Figure 23. |
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