DA7280 datasheet(28/80 Pages) RENESAS

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DA7280-Automotive

Wideband LRA/ERM Haptic Driver for Automotive

Applications

Datasheet

Revision 1.4

01-Mar-2022

CFR0011-120-00

28 of 79

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-A 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-A 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-A to go to Inactive mode.

2. Configure STANDBY_EN to return to IDLE or STANDBY state after playback has finished.

5.6.5.2

Direct Register Override (DRO) Mode

Figure 13 shows how to operate the device in DRO mode.

1. Starting from either the IDLE or STANDBY state, write the initial drive amplitude of the haptic

sequence to OVERRIDE_VAL.

2. When ready to begin playback, set OPERATION_MODE = 1. The output will begin switching

after approximately 0.75 ms.

3. While in the DRIVE state, write to OVERRIDE_VAL to drive a new amplitude and create the

desired envelope of the haptic sequence. If OVERRIDE_VAL = 0 during the DRIVE state,

DA7280-A will disable its output stage, but remain in a low latency-to-drive state and wait for

further updates to OVERRIDE_VAL.

4. To stop driving set OPERATION_MODE = 0. DA7280-A returns to either the IDLE or STANDBY

state, depending on the value of STANDBY_EN.

Note: The allowable range of values written to OVERRIDE_VAL depends on whether

ACCELERATION_EN is set to 1 or 0. If ACCELERATION_EN = 1 then the usable range for

OVERRIDE_VAL is 0x00 to 0x7F. If ACCELERATION_EN = 0 then the usable range for

OVERRIDE_VAL is 0x00 to 0xFF in two’s complement. For further explanation, see Figure 30 and

Figure 31.

DA7280 Datasheet(PDF) 28 Page - Renesas Technology Corp