DA7281 datasheet(69/88 Pages) RENESAS

69 / 88 page

DA7281

LRA/ERM Haptic Driver with Multiple I²C

Addresses, Integrated Waveform Memory, and

Wideband Support

Datasheet

Revision 3.1

10-Feb-2022

CFR0011-120-00

69 of 87

Bit

Mode

Symbol

Description

Reset

��2��_��_��[7: 0]

��2��_��[15: 0] − ��2��_��_��[7: 0]

256

��2��_��_��[7: 0]

= ��2��_��[15: 0]

− 256 × ��2��_��_��[7: 0]

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

impedance of the actuator in

Ω (as read from its datasheet), and

IMAX[4:0] is the 5-bit value of IMAX, see Section 5.6.2.

Table 36: CALIB_IMP_H (0x0011)

Bit

Mode

Symbol

Description

Reset

[7:0]

IMPEDANCE_H

MS-bits of calculated impedance (

default 22 Ω), see

Section 5.7.3.

�� (Ω) = 4 × 62.5 × 10−3 × ��_��

+ 62.5 × 10−3 × ��_��

0x00

Table 37: CALIB_IMP_L (0x0012)

Bit

Mode

Symbol

Description

Reset

[1:0]

IMPEDANCE_L

LS-bits of calculated impedance (

default 22 Ω), see

Section 5.7.3.

�� (Ω) = 4 × 62.5 × 10−3 × ��_��

+ 62.5 × 10−3 × ��_��

0x0

Table 38: TOP_CFG1 (0x0013)

Bit

Mode

Symbol

Description

Reset

[7]

EMBEDDED_M

ODE

Embedded operation enable (self-clearing IRQs), see

Section 5.7.7.

0x0 = Faults cleared by host

0x1 = DA7281 clears faults automatically

0x0

[5]

ACTUATOR_TY

Specifies actuator type: LRA or ERM, see Section 5.6.2.

0x0 = LRA

0x1 = ERM

0x0

[4]

BEMF_SENSE_

Enable internal loop computations; should be disabled only in

custom waveform and wideband operation, see Sections 5.7.5

and 5.7.6.

0x0 = Custom Waveform Operation

0x1 = Standard Operation

0x1

DA7281 Datasheet(PDF) 69 Page - Renesas Technology Corp

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