DA7282-00FVC datasheet(30/88 Pages) RENESAS

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DA7282

LRA/ERM Ultra-Low Power Haptic Driver with

Multiple Input Triggers and Integrated

Waveform Memory

Datasheet

Revision 3.1

10-Feb-2022

CFR0011-120-00

30 of 87

automatically calculates the values required and sets the registers based on the entered actuator

datasheet parameters. If the Dialog SmartCanvas GUI is not used, follow the steps outlined in this

section.

5.6.1

Boot

DA7282 comes out of reset when a power supply is provided to the device and boots for 1.5 ms. This

is followed by entry to the Inactive mode where the device is kept in its lowest power state.

5.6.2

Actuator Setup

The following setup procedure needs to be observed to program DA7282 to work with a specific

actuator:

1. Choose the correct actuator type using ACTUATOR_TYPE, 0 = LRA and 1 = ERM.

2. Choose the correct nominal maximum voltage across the actuator by checking the actuator

datasheet for the maximum allowed RMS voltage and writing the value to

ACTUATOR_NOMMAX. The allowable range is between 0 V and 6 V in 23.4 mV steps. The

ACTUATOR_NOMMAX setting can be calculated using the following formula:

��_��[7: 0] =

��_��

23.4 × 10−3

(1)

3. Choose the correct absolute maximum peak voltage across the actuator by checking the actuator

datasheet and writing the value to ACTUATOR_ABSMAX. The allowable range is between 0 V

and 6 V in 23.4 mV steps. The ACTUATOR_ABSMAX value can be calculated using the

following formula:

��_��[7: 0] =

��_��

23.4 × 10−3

(2)

4. Program the IMAX value (in units of mA) for the actuator using the following formula:

��[4: 0] =

��max _��_�� − 28.6

7.2

– where Imax_actuator_mA is the actuator max rated current in mA, as listed in its datasheet.

Note that in general this should slightly exceed the ACTUATOR_ABSMAX voltage

divided by the actuator impedance.

(3)

5. Program the impedance of the actuator by checking the actuator datasheet and calculating the

values for V2I_FACTOR_H and V2I_FACTOR_L using the following formulae:

��2��_��[15: 0] =

�� × (��[4: 0] + 4)

1.6104

(4)

��2��_��_��[7: 0] =

��2��_��[15: 0] − ��2��_��_��[7: 0]

256

(5)

��2��_��_��[7: 0] = ��2��_��[15: 0] − 256 × ��2��_��_��[7: 0]

(6)

– Where V2I_FACTOR[15:0] is the 16-bit concatenation of V2I_FACTOR_H[7:0] and

V2I_FACTOR_L[7:0], Z is the impeda

nce of the actuator in Ω (as read from its datasheet),

and IMAX[4:0] is the 5-bit value of IMAX.

6. Program the LRA resonant frequency in terms of period by updating LRA_PER_H and

LRA_PER_L based on the following formula:

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