Texas Instruments DRV2605EVM-CT ERM/LRA Haptic Driver Evaluation DRV2605EVM-CT DRV2605EVM-CT Datenbogen
Produktcode
DRV2605EVM-CT
SLOS825B – DECEMBER 2012 – REVISED JANUARY 2014
MULTI-MODE INPUT PIN (IN/TRIG)
The multi-mode input pin serves four different functions:
1. PWM Input Mode
2. Analog Input Mode
3. Audio To Haptics Mode
4. Input Trigger Mode
If the IN/TRIG pin function is not needed, the pin should be tied directly to ground.
PWM Input Option
The user may enter the PWM mode by setting Mode register value to 3 and setting the nPWM_Analog bit to 0.
When in this mode, the DRV2605 accepts PWM data at the IN/TRIG pin. The DRV2605 drives the actuator
continuously in this mode until the user sets the device into STANDBY mode, or enters another interface mode.
The interpretation of the duty cycle information varies according to the chosen mode of operation. See “Modes Of
Operation” for details.
The user may enter the PWM mode by setting Mode register value to 3 and setting the nPWM_Analog bit to 0.
When in this mode, the DRV2605 accepts PWM data at the IN/TRIG pin. The DRV2605 drives the actuator
continuously in this mode until the user sets the device into STANDBY mode, or enters another interface mode.
The interpretation of the duty cycle information varies according to the chosen mode of operation. See “Modes Of
Operation” for details.
Analog Input Option
The user may enter the analog input mode by setting Mode register value to 3, and setting the nPWM_Analog bit
to 1. When in this mode, the DRV2605 accepts an analog voltage at the IN/TRIG pin. The DRV2605 will drive
the actuator continuously in this mode until the user sets the device into STANDBY mode, or enters another
interface mode. The reference voltage in this mode is 1.8 V, so 1.8 V will be interpreted as a 100% input value,
0.9 V will be 50%, and 0 V will be 0%. The input value is analogous to the duty cycle percentage in PWM mode.
The interpretation of these percentages varies according to the chosen mode of operation. See “Modes Of
Operation” for details.
The user may enter the analog input mode by setting Mode register value to 3, and setting the nPWM_Analog bit
to 1. When in this mode, the DRV2605 accepts an analog voltage at the IN/TRIG pin. The DRV2605 will drive
the actuator continuously in this mode until the user sets the device into STANDBY mode, or enters another
interface mode. The reference voltage in this mode is 1.8 V, so 1.8 V will be interpreted as a 100% input value,
0.9 V will be 50%, and 0 V will be 0%. The input value is analogous to the duty cycle percentage in PWM mode.
The interpretation of these percentages varies according to the chosen mode of operation. See “Modes Of
Operation” for details.
Audio To Haptics Mode
The DRV2605 features an audio to haptics mode that converts an audio input signal into meaningful haptic
effects using the Immersion "BOOMbox" technology. Audio to haptics mode adds a vibratory "bass extension" to
portable devices, allowing the user to feel their audio/visual content. This is a key feature because it allows for
the "haptification" of existing applications without the need for additional software drivers. Additionally, event-
driven audio effects generated within an operating system can be used to automatically "haptify" a product.
The DRV2605 features an audio to haptics mode that converts an audio input signal into meaningful haptic
effects using the Immersion "BOOMbox" technology. Audio to haptics mode adds a vibratory "bass extension" to
portable devices, allowing the user to feel their audio/visual content. This is a key feature because it allows for
the "haptification" of existing applications without the need for additional software drivers. Additionally, event-
driven audio effects generated within an operating system can be used to automatically "haptify" a product.
To take advantage of this feature, connect the DRV2605 to a line out source as shown in
. The full-
scale range of the IN/TRIG pin in the audio to haptics mode is 1.8 V
PP
. The input impedance is 100 k
Ω, so a
resistive divider can be used if the input source is greater than 1.8 V
PP
, and a 0.1 µF capacitor is recommended
to AC couple the audio source and the IN/TRIG pin. For sources smaller than 1.8 V
PP
, the ATH_MaxInput
parameter can be used to scale down the input range. To put the device in audio to haptics mode, set
Mode[2:0] = 4, and set the AC_Couple and nPWM_Analog bits to 1. See the register map for more details.
Mode[2:0] = 4, and set the AC_Couple and nPWM_Analog bits to 1. See the register map for more details.
Input Trigger Option
The user may enter the external trigger modes by setting the Mode register value to 1 or 2. A value of 1 enters
Edge Mode, and a value of 2 enters Level Mode. In these modes, the IN/TRIG pin provides external trigger
control of the GO bit, which allows ROM waveforms to be fired by GPIO control. This external trigger control can
provide improved latencies in systems where there is significant delay between the time the effect is desired and
the time a GO command can be sent over the I
The user may enter the external trigger modes by setting the Mode register value to 1 or 2. A value of 1 enters
Edge Mode, and a value of 2 enters Level Mode. In these modes, the IN/TRIG pin provides external trigger
control of the GO bit, which allows ROM waveforms to be fired by GPIO control. This external trigger control can
provide improved latencies in systems where there is significant delay between the time the effect is desired and
the time a GO command can be sent over the I
2
C interface. Note that the effect to be triggered must already be
selected to take advantage of the lower latency, so this works best for accelerating a pre-queued high-priority
effect (like a button press) or for the repeated firing of the same effect (like scrolling).
effect (like a button press) or for the repeated firing of the same effect (like scrolling).
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