Datasheet

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
39 of 76
© 2019 Dialog Semiconductor
For LOOP_FILT_RES_TRIM apply the settings in Table 16.
Table 16: LOOP_FILT_RES_TRIM Register Trim Settings
L
series
(µH)
R
series
(Ω)
25 or
lower
50
75
100
125
150
175
200
225
250 or
higher
4
2
2
3
3
3
3
3
3
3
3
6
1
2
2
3
3
3
3
3
3
3
8
1
2
2
2
3
3
3
3
3
3
10
0
1
2
2
2
3
3
3
3
3
12
0
1
2
2
2
2
3
3
3
3
14
0
1
1
2
2
2
2
3
3
3
16
0
1
1
2
2
2
2
2
3
3
18
0
0
1
1
2
2
2
2
2
3
20
0
1
1
2
2
2
3
3
3
3
22
0
1
1
2
2
2
2
3
3
3
24
0
1
1
2
2
2
2
3
3
3
26
0
1
1
2
2
2
2
2
3
3
28
0
1
2
2
2
3
3
3
3
3
30
0
1
2
2
2
3
3
3
3
3
32
0
1
2
2
2
2
3
3
3
3
34
0
1
1
2
2
2
3
3
3
3
36 to 40
0
1
1
2
2
2
2
3
3
3
42
0
1
2
2
3
3
3
3
3
3
44
0
1
2
2
3
3
3
3
3
3
46 to 50
0
1
2
2
2
3
3
3
3
3
Set LOOP_FILT_LOW_BW high if the actuator inductance exceeds 1 mH.
5.7.10 UVLO Threshold
The DA7280 UVLO has a default fall threshold of 2.8 V. This is adjustable in 100 mV steps via
REF_UVLO_THRES. The full range is 2.7 V to 3.0 V.
5.7.11 Edge Rate Control
DA7280 contains an advanced switching node ERC to minimize EMI and board disturbances. The
slope of the ERC can be adjusted by changing the values of the HBRIDGE_ERC_LS_TRIM (for low-
side FET ERC) and HBRIDGE_ERC_HS_TRIM (for high-side FET ERC). Default value is 100 mVn/s
and the adjustable range is 25 mV/ns to 100 mV/ns in 25 mV/ns steps.
5.7.12 Double Output Current Range
The nominal current rating for the DA7280 current regulation output is 250 mA. This range covers
existing LRAs, however some LRA manufacturers allow significant actuator overdrive over short
periods of time. DA7280 supports this by enabling LOOP_IDAC_DOUBLE_RANGE, which doubles
the maximum output current. When this is enabled, the following setup changes apply:
● IMAX now corresponds to twice the value computed by the formula in Section 5.6.2.