DA7280 datasheet(19/76 Pages) DIALOG

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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

19 of 76

5.2

Functional Modes

5.2.1

System States

DA7280 features IDLE and STANDBY states ensuring lowest power consumption and lowest start-

up latency in different operating conditions. In addition, when any fault is detected, the device returns

directly to the IDLE state. Figure 8 shows the device states and the transitions into and out of each

state.

When a power supply is applied, DA7280 loads the register default settings. Once BOOT is

complete, DA7280 remains in the IDLE state and awaits further I2C communication.

DA7280 enters the DRIVE state when playback of a haptic sequence begins. There are several

different operating modes for playback, see Section 5.2.2.

On completion of playback, DA7280 leaves DRIVE state and returns either to IDLE state (for low

power consumption) or STANDBY state (for low latency-to-drive). This is configured using

STANDBY_EN.

If a fault condition occurs, DA7280 returns to the IDLE state, see Section 5.6.6 .

IDLE

(IQ = 0.36 µA)

BOOT

Boot

complete

OFF

DRIVE

STANDBY

(IQ = 0.8 mA)

Start driving

approx. 0.75 ms

after drive request

Stop

driving

Set STANDBY_EN = 0

STANDBY_EN

VDD ≥ 2.7 V

Start driving

after approx.

0.15 ms delay

The conditions for start/

stop driving vary

depending on

OPERATION_MODE

DA7280 returns to

the IDLE state in a

fault condition

Figure 8: System State Diagram

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