DRV2604L Datasheet, PDF (22/73 Pages) Texas Instruments – DRV2604L 2- to 5.2-V Haptic Driver for LRA and ERM with Internal Memory and Smart-Loop Architecture

DRV2604L
SLOS866D – MAY 2014 – REVISED JUNE 2015
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MODE[2:0] = 1 (External trigger ² edge)
Also accessible
2
(R/W) through I C
MODE[2:0] = 2 (External trigger ² level)
GO Bit
IN/TRIG (Trigger)
GO Bit
MODE[2:0] = 3 (PWM and analog input)
GO Signal
MODE[2:0] = 5 (RTP mode)
Figure 18. GO-Signal Logic
8.4.4 Operation During Exceptional Conditions
This section lists different exceptional conditions and the ways that the DRV2604L device operates during these
conditions. This section also describes how the device goes into and out of these states.
8.4.4.1 Operation With No Actuator Attached
In LRA closed-loop mode, if a waveform is played without an actuator connected to the OUT+ and OUT– pins,
the output pins toggle. However, the toggling frequency is not predictable. In LRA open-loop mode, the output
pins toggle at the specified open-loop frequency.
8.4.4.2 Operation With a Non-Moving Actuator Attached
The model of a non-moving actuator can be simplified as a resistor. If a resistor (with similar loading as an LRA,
such as 25 O) is connected across the OUT+ and OUT– pins, and the DRV2604L device is in LRA closed-loop
mode, the output pins toggle at a default frequency calculated with Equation 1. In LRA open-loop mode the
output pins toggle at the specified open-loop frequency.
8.4.4.3 Operation With a Short at REG Pin
If the REG pin is shorted to GND, the device automatically shuts down and an overcurrent-protection circuit is
enabled and clamps the maximum current supplied by the regulator. When the short is removed, the device
starts in the default condition.
8.4.4.4 Operation With a Short at OUT+, OUT–, or Both
If any of the output pins (OUT+ or OUT–) is shorted to V_DD, GND, or to each other while the device is playing a
waveform, the OC_DETECT bit is asserted and remains asserted until the short is removed. A current-protection
circuit automatically enables to shutdown the current through the short.
If the driver is playing a waveform the DRV2604L device checks for shorts in the output through either a haptic-
playback, auto-calibration, or diagnostics process. If the short occurs when the device is idle, the short is not
detected until the device attempts to run a waveform.
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