Datasheet

Table Of Contents

DRV2605

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SLOS825B –DECEMBER 2012–REVISED JANUARY 2014

Control1 (Address: 0x1B)

Bit 7 6 5 4 3 2 1 0

Function StartupBoost AC_Couple DriveTime[4] DriveTime[3] DriveTime[2] DriveTime[1] DriveTime[0]

Type R/W R/W R/W R/W R/W R/W R/W

Default 1 0 1 0 0 1 1

StartupBoost Applies higher loop gain during overdrive to enhance actuator transient response.

AC_Couple Applies a 0.9V common mode voltage to the IN/TRIG pin when an AC coupling capacitor is

used. This is only useful for analog input mode. This should not be asserted for PWM mode

or external trigger mode.

0: Common-mode drive disabled for DC coupling or digital inputs modes

1: Common-mode drive enabled for AC coupling

DriveTime[4:0] LRA Mode: Sets initial “guess” for LRA drive time in LRA mode. Drive time is automatically

adjusted for optimum drive on the fly; however, this register should be optimized for the

approximate LRA frequence. If it is set too low, it may affect the actuator startup time. If it is

set too high, it may cause instability. Optimum Drive Time (ms) ≈ 0.5 × LRA Period

Drive Time (ms) = DriveTime[4:0] × 0.1 ms + 0.5 ms

ERM Mode: Sets the sample rate for the back-EMF detection. Lower drive times cause

higher peak-to-average ratios in the output signal, requiring more supply headroom. Higher

drive times cause the feedback to react at a slower rate.

Drive Time (ms) = DriveTime[4:0] × 0.2 ms + 1 ms

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