Datasheet

DRV2605
www.ti.com SLOS825B –DECEMBER 2012–REVISED JANUARY 2014
Auto Calibration Compensation Result (Address: 0x18)
Bit 7 6 5 4 3 2 1 0
Function ACalComp[7] ACalComp[6] ACalComp[5] ACalComp[4] ACalComp[3] ACalComp[2] ACalComp[1] ACalComp[0]
Type R/W R/W R/W R/W R/W R/W R/W R/W
Default 0 0 0 0 1 1 0 1
ACalComp[7:0] Contains the voltage compensation result after execution of auto calibration. This value
compensates for any resistive losses in the driver. The calibration routine checks the
impedance of the actuator to automatically determine an appropriate value. The auto
calibration compensation result value is multiplied by the drive gain during playback.
Auto Calibration Compensation Coefficient = 1 + ACalComp[7:0] / 255
Auto Calibration Back-EMF Result (Address: 0x19)
Bit 7 6 5 4 3 2 1 0
Function ACalBEMF[7] ACalBEMF[6] ACalBEMF[5] ACalBEMF[4] ACalBEMF[3] ACalBEMF[2] ACalBEMF[1] ACalBEMF[0]
Type R/W R/W R/W R/W R/W R/W R/W R/W
Default 0 1 1 0 1 1 0 1
ACalBEMF[7:0] Contains the rated back-EMF result after execution of auto calibration. This is the level of
back-EMF voltage that the actuator gives when it is driven at its rated voltage. The
DRV2605 playback engine uses this value to automatically determine the appropriate
feedback gain for closed loop operation.
Auto Calibration Back-EMF (V) = (ACalBEMF[7:0] / 255) × 4.88 V / BEMFGain
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