DRV2605L Datasheet, PDF (55/69 Pages) Texas Instruments – DRV2605L 2 to 5.2 V Haptic Driver for LRA and ERM With Effect Library and Smart-Loop Architecture

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DRV2605L
SLOS854C – MAY 2014 – REVISED SEPTEMBER 2014
9.2.2.3 Interface Selection
The I²C interface is required to configure the device. The device can be used fully with this interface and with
either RTP or internal memory. The advantage of using this 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 59.
9.2.2.4 Power Supply Selection
The DRV2605L 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.
9.2.3 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 63. 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 64. LRA Click With and Without Braking
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