Texas Instruments DRV2605EVM-CT Datenbogen
Time (s)
V
oltage (2V/div)
0
40m
80m
120m
160m
200m
IN/TRIG
Acceleration
[OUT+] − [OUT−] (Filtered)
Acceleration
[OUT+] − [OUT−] (Filtered)
Time (s)
V
oltage (2V/div)
0
40m
80m
120m
160m
200m
IN/TRIG
Acceleration
[OUT+] − [OUT−] (Filtered)
Acceleration
[OUT+] − [OUT−] (Filtered)
SLOS825C – DECEMBER 2012 – REVISED SEPTEMBER 2014
8.2.2.3 Interface Selection
The I
2
C 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 I
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 I
2
C 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
backward compatibility. If audio-to-vibe is desired, then use C
(IN)
as shown in
.
8.2.2.4 Power Supply Selection
The DRV2605 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.
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.
particularly true if 2 AA batteries in series are being used to power the system.
8.2.3 Application Curves
V
DD
= 3.6 V
ERM open loop
V
DD
= 3.6 V
LRA closed loop
Strong click - 60%
External edge trigger
Strong click - 100%
External level trigger
Figure 59. ERM Click with and without Braking
Figure 60. LRA Click With and Without Braking
50
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