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DA7280 bảng dữ liệu(PDF) 39 Page - Renesas Technology Corp

tên linh kiện DA7280
Giải thích chi tiết về linh kiện  Wideband LRA/ERM Haptic Driver for Automotive Applications
PDF  80 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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DA7280 bảng dữ liệu(HTML) 39 Page - Renesas Technology Corp

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DA7280-Automotive
Wideband LRA/ERM Haptic Driver for Automotive
Applications
Datasheet
Revision 1.4
01-Mar-2022
CFR0011-120-00
39 of 79
© 2022 Renesas Electronics
The timing of the sequence can be described as follows in Figure 20 where Amplitude X denotes
consecutive different output drive values:
Time [s]
OUTP
OUTN
POLARITY
0
0
1
1
OVERRIDE_VAL
0
3
1
4
I2C Update
1
3
2
4
2
Amplitude
0
Amplitude
3
Amplitude
1
Amplitude
2
Figure 20: Polarity Timing Relationship
5.7.9
Loop Filter Configuration
Haptic actuators (both ERM and LRA) can be modelled as a series combination of a resistor (Series
R) and inductor (Series L) followed by a BEMF voltage source, see Figure 21.
RSERIES
LSERIES
BEMF
O
Figure 21: Equivalent Electrical Model of an Actuator
The usual variation of RSERIES is from 8
Ω to 50 Ω and LSERIES is from 20 µH to either 2 mH or 3 mH.
The current regulation loop in the output drive must be kept stable by applying the correct setting in
the loop's filter. While the defaults cover the vast majority of available LRAs and ERMs further tuning
is possible by adjusting LOOP_FILT_CAP_TRIM, LOOP_FILT_RES_TRIM, and
LOOP_FILT_LOW_BW.
For LOOP_FILT_CAP_TRIM apply the settings in Table 14.
Table 14: LOOP_FILT_CAP_TRIM Register Trim Settings
Actuator
Series Resistance (Ω)
Register
< 18
18 to 28
28 to 41
> 41
LOOP_FILT_CAP_TRIM
3
2
1
0



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