DRV2605L-Q1 Datasheet, PDF (16/67 Pages) Texas Instruments – Automotive Haptic Driver for LRA and ERM

DRV2605L-Q1
SLOS874A – OCTOBER 2015 – REVISED OCTOBER 2015
www.ti.com
7.3.5.6.2 Edge Trigger
A low-to-high transition on the IN/TRIG pin sets the GO bit. The playback sequence indicated in the waveform
sequencer plays as normal. The user can cancel the transaction by clearing the GO bit. An additional low-to-high
transition while the GO bit is high also cancels the transaction which clears and resets the GO bit. Clearing the
trigger pin (high-to-low transition) does nothing so the user can send a short pulse without knowing how long the
waveform is. The pulse width should be at least 1 µs to ensure detection.
Edge Trigger
Haptic Waveform
Edge Trigger
Cancellation
Haptic Waveform
Figure 13. Edge Trigger Mode
7.3.5.6.3 Level Trigger
The actions of the GO bit directly follow the IN/TRIG pin. When the IN/TRIG pin is high, the GO bit is high. When
the IN/TRIG pin goes low, the GO bit clears. Therefore, a falling edge cancels the transaction. The level trigger
can implement a GPIO-controlled buzz on-off controller if an appropriately long waveform is selected. The user
must hold the IN/TRIG high for the entire duration of the waveform to complete the effect.
Level Trigger
Haptic Waveform
Level Trigger
Cancellation
Haptic Waveform
Figure 14. Level Trigger Mode
7.3.5.7 Noise Gate Control
When an actuator is driven with an analog or PWM signal, noise in the line can cause the actuator to vibrate
unintentionally. For that reason, the DRV2605L-Q1 device features a noise gate that filters out any voltage
smaller than a particular threshold. The NG_THRESH[1:0] bit in register 0x1D controls the threshold.
7.3.6 Edge Rate Control
The DRV2605L-Q1 output driver implements edge rate control (ERC). The ERC ensures that the rise and fall
characteristics of the output drivers do not emit levels of radiation that could interfere with other circuitry common
in mobile and portable platforms. Because of ERC most system do not require external output filters, capacitors,
or ferrites beads.
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