Datasheet
Table Of Contents
- General Description
- Key Features
- Applications
- System Diagrams
- Contents
- Figures
- Tables
- Legal
- Product Family
- 1 Terms and Definitions
- 2 Block Diagram
- 3 Pinout
- 4 Characteristics
- 5 Functional Description
- 5.1 Features Description
- Driving LRA and ERM Actuators
- Automatic LRA Resonant Frequency Tracking
- Wideband LRA Support
- I2C and PWM Input Streaming
- Low Latency I2C/GPI Wake-Up from IDLE State
- Three GPI Sequence Triggers for up to Six Independent Haptic Responses
- On-Board Waveform Memory with Amplitude, Time, and Frequency Control
- Active Acceleration and Rapid Stop for High-Fidelity Haptic Feedback
- Continuous Actuator Diagnostics and Fault Handling
- No Software Requirements with Embedded Operation
- Differential Output Drive
- Current Driven System
- Configurable EMI Suppression
- Automatic Short Circuit Protection
- Ultra-Low Power Consumption with State Retention
- Ultra-Low Latency in STANDBY State
- Supply Monitoring, Reporting, and Automatic Output Limiting
- Open- and Closed-Loop Modes
- Open-Loop Sine/Custom Wave Drive Support
- Small Solution Footprint
- Additional Features
- 5.2 Functional Modes
- 5.3 Resonant Frequency Tracking
- 5.4 Active Acceleration and Rapid Stop
- 5.5 Wideband Frequency Control
- 5.6 Device Configuration and Playback
- 5.7 Advanced Operation
- 5.7.1 Frequency Tracking
- 5.7.2 Rapid Stop
- 5.7.3 Initial Impedance Update
- 5.7.4 Amplitude PID
- 5.7.5 Wideband Operation
- 5.7.6 Custom Waveform Operation
- 5.7.7 Embedded Operation
- 5.7.8 Polarity Change Reporting for Half-Period Control in DRO Mode
- 5.7.9 Loop Filter Configuration
- 5.7.10 UVLO Threshold
- 5.7.11 Edge Rate Control
- 5.7.12 Double Output Current Range
- 5.7.13 Supply Monitoring, Reporting, and Automatic Output Limiting
- 5.7.14 BEMF Fault Limit
- 5.7.15 Increasing Impedance Detection Accuracy
- 5.7.16 Frequency Pause during Rapid Stop
- 5.7.17 Frequency Pause during Rapid Stop
- 5.7.18 Coin ERM Operation
- 5.8 Waveform Memory
- 5.9 General Data Format
- 5.10 I2C Control Interface
- 5.1 Features Description
- 6 Register Overview
- 7 Package Information
- 8 Ordering Information
- 9 Application Information
- 10 Layout Guidelines
DA7280
LRA/ERM Haptic Driver with Multiple Input Triggers,
Integrated Waveform Memory and Wideband Support
Datasheet
Revision 3.0
30-Jul-2019
CFR0011-120-00
59 of 76
© 2019 Dialog Semiconductor
Table 28: FRQ_LRA_PER_L (0x000B)
Bit
Mode
Symbol
Description
Reset
[6:0]
RW
LRA_PER_L
Used for specifying the LRA drive frequency. LS-bits of the
initial LRA resonant frequency period.
Where LRA
freq
represents the LRA resonant frequency in
Hz as listed in the actuator datasheet. See Section 5.6.2.
Default corresponds to 174 Hz.
0x4F
Table 29: ACTUATOR1 (0x000C)
Bit
Mode
Symbol
Description
Reset
[7:0]
RW
ACTUATOR_NO
MMAX
Nominal actuator voltage rating, unsigned, see Section 5.6.2
Sets full-scale of unsigned haptic waveform when acceleration
enabled (ACCELERATION_EN = 1)
Default: 0x5A = 2.106 V
0x5A
Table 30: ACTUATOR2 (0x000D)
Bit
Mode
Symbol
Description
Reset
[7:0]
RW
ACTUATOR_ABS
MAX
Absolute actuator maximum voltage rating, see Section 5.6.2.
Overdrive is limited to this value when acceleration enabled
(ACCELERATION_EN = 1)
Sets full-scale of unsigned haptic waveform when acceleration
disabled
Default: 0x78 = 2.808 V
0x78
Table 31: ACTUATOR3 (0x000E)
Bit
Mode
Symbol
Description
Reset
[4:0]
RW
IMAX
Actuator max current rating
where I
max_actuator_mA
is the actuator max rated current in mA, as
listed in its datasheet, see Section 5.6.2.
Default: 0x17 = 194 mA
0x17