DA7281 datasheet(68/76 Pages) DIALOG

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DA7281

LRA/ERM Haptic Driver with Multiple I²C Addresses,

Integrated Waveform Memory, and Wideband Support

Datasheet

Revision 3.0

30-Jul-2019

CFR0011-120-00

68 of 76

Table 62: LRA_AVR_L (0x0045)

Bit

Mode

Symbol

Description

Reset

[6:0]

LRA_PER_AVERA

GE_L

LS-bits of the average LRA resonant period based on the last

four half-periods, see Section 5.7.1. The following formula

describes the output:

�� (��)

= 1333.32 × 10−9 × (128

× ��_��_��_��

+ ��_��_��_��)

0x0

Table 63: FRQ_LRA_PER_ACT_H (0x0046)

Bit

Mode

Symbol

Description

Reset

[7:0]

LRA_PER_ACTUA

L_H

MS-bits of the actual LRA resonant period based on half-

period, see Section 5.5.The following formula describes the

output:

�� (��)

= 1333.32 × 10−9 × (128

× ��_��_��_��

+ ��_��_��_��)

0x21

Table 64: FRQ_LRA_PER_ACT_L (0x0047)

Bit

Mode

Symbol

Description

Reset

[6:0]

LRA_PER_ACTUAL

LSBs of the actual LRA resonant period based on half-period,

see Section 5.5.The following formula describes the output:

�� (��)

= 1333.32 × 10−9 × (128

× ��_��_��_��

+ ��_��_��_��)

0x4F

Table 65: FRQ_PHASE_H (0x0048)

Bit

Mode

Symbol

Description

Reset

[7:0]

DELAY_H

Used during custom waveform operation, see Section 5.7.5.

Only use the following settings, all other settings are reserved:

0x0 = Setting for wideband mode

0x25 = Setting for closed-loop frequency tracking mode

0x25

Table 66: FRQ_PHASE_L (0x0049)

Bit

Mode

Symbol

Description

Reset

[7]

DELAY_FREEZE

Used during custom waveform operation. Set to 1 only in

wideband mode with frequency tracking disabled, see Section

5.7.5

0x0 = Setting for closed-loop frequency tracking mode

0x1 = Setting for wideband mode

0x0

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