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
27 of 76
© 2019 Dialog Semiconductor
5.6.4 Waveform Memory Setup
The Waveform Memory is initially empty. The user can create any set of haptic sequences by
following the Waveform Memory format described in Section 5.8. For ease of use, the Dialog
SmartCanvas GUI also provides a graphical tool to create sequences. The sequences can then be
uploaded to the DA7280 Waveform Memory by going through the following steps:
1. Ensure that DA7280 is in Inactive mode (no playback ongoing and at least 1.5 ms have passed
since cold boot).
2. Ensure the Waveform Memory is unlocked, set WAV_MEM_LOCK = 1.
3. Read back the location of SNP_MEM_0 by checking WAV_MEM_BASE_ADDR.
4. Write the new contents of the Waveform Memory by starting from SNP_MEM_0.
5. If desired, re-lock the Waveform Memory, set WAV_MEM_LOCK = 0.
Once the DA7280 Waveform Memory is configured, it is retained until a power-on reset event. The
host can update the Waveform Memory as many times as needed during the lifetime of the device.
5.6.5 Mode Configuration
Set OPERATION_MODE according to the operating mode to be used. The device configuration flow
is different for each operating mode. Sections 5.6.5.1 to 5.6.5.5 explain how to set up and operate
the device in each of the operating modes.
5.6.5.1 Inactive Mode
In Inactive mode, DA7280 waits in a low-power state in between playback events. For more details
on power and latency trade-offs see Sections 5.2.1 and 5.2.3.
1. Set OPERATION_MODE = 0 for DA7280 to go to Inactive mode.
2. Configure STANDBY_EN to return to IDLE or STANDBY state after playback has finished.