DRV2605L-Q1 Datasheet, PDF (54/67 Pages) Texas Instruments – Automotive Haptic Driver for LRA and ERM

DRV2605L-Q1
SLOS874A – OCTOBER 2015 – REVISED OCTOBER 2015
www.ti.com
8.2.2.3 Interface Selection
The I²C interface is required to configure the device. The device can be used fully with the I²C interface and with
either RTP or internal memory. The advantage of using the I²C interface is that no additional GPIO (for the
IN/TRIG pin) is required for firing effects, and no PWM signal is required to be generated. Therefore the IN/TRIG
pin can be connected to GND. Using the external trigger pin has the advantage that no I²C transaction is
required to fire the pre-loaded effect, which is a good choice for interfacing with a button. The PWM interface is
available for backward compatibility. If audio-to-vibe is desired, then use C_(IN) as shown in Figure 58.
8.2.2.4 Power Supply Selection
The DRV2605L-Q1 device supports a wide range of voltages in the input. Ensuring that the battery voltage is
high enough to support the desired vibration strength with the selected actuator is an important design
consideration. The typical application uses Li-ion or Li-polymer batteries which provide enough voltage headroom
to drive most common actuators.
If very strong vibrations are desired, a boost converter can be placed between the power supply and the V_DD pin
to provide a constant voltage with a healthy headroom (5-V rails are common in some systems) which is
particularly true if 2 AA batteries in series are being used to power the system.
8.2.3 Application Curves
IN/TRIG
Acceleration
[OUT+] − [OUT−] (Filtered)
IN/TRIG
Acceleration
[OUT+] − [OUT−] (Filtered)
0
40m
V_DD = 3.6 V
Strong click - 60%
80m
120m
Time (s)
160m
ERM open loop
External edge trigger
200m
Figure 62. ERM Click with and without Braking
0
40m
V_DD = 3.6 V
Strong click - 100%
80m
120m
Time (s)
160m
LRA closed loop
External level trigger
200m
Figure 63. LRA Click With and Without Braking
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