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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

37 of 76

Configure the following bits to enable custom waveform operation:

● BEMF_SENSE_EN = 0

● WAVEGEN_MODE = 1

● V2I_FACTOR_FREEZE = 1

● DELAY_H = 0

● DELAY_SHIFT_L = 0

● DELAY_FREEZE = 1

● ACCELERATION_EN = 0

● RAPID_STOP_EN = 0

● AMP_PID_EN = 0

After the above setup is executed, amplitude data can be streamed in any mode, see Section 5.6.5,

and output frequency can be updated, see Section 5.7.6.

5.7.7

Embedded Operation

Should DA7280 be required to operate in a setup where no host is present or due to software

limitations unable to communicate with the device during its required operation, DA7280 can operate

in embedded operation by setting EMBEDDED_MODE = 1. In this case DA7280 is configured to

clear all system faults as it enters inactive mode when playback is finished or if a fault has been

detected, see Section 5.6.6.

For example, if a short circuit occurs, the system will react in its usual way: stop driving, disable the

current loop, and go to Inactive mode. Once in Inactive mode, the generated interrupt is

automatically cleared and DA7280 will attempt to drive again on the next playback request without

the host having to come in and clear faults.

5.7.8

Polarity Change Reporting for Half-Period Control in DRO Mode

For advanced sequence playback in DRO mode, the host may require DA7280 to update the output

drive amplitude every half period. Since the I2C clock is asynchronous to the DA7280 internal clock

and the exact timing of the half-period will change dynamically based on the frequency tracking loop,

this is not a trivial operation.

To overcome this limitation, the register POLARITY provides feedback. POLARITY toggles at the

start of every half-period (so at a rate of 400 Hz for a 200 Hz resonant frequency actuator). This

allows software synchronization of the updates to the OVERRIDE_VAL, see Figure 19.

Did POLARITY

toggle?

Update

OVERRIDE_VAL

Wait 25 µs

Yes

Read POLARITY

Figure 19: Half-Period Control in DRO Mode

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