Datasheet

INTRODUCTION

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The FG signal’s frequency represents the motor speed and phase information.

RPM = (FG x 60)/pole pairs (2)

Please refer to the datasheet of the DRV10866 for more information regarding the FG pin.

2.3 Jumpers

There are two jumpers (J1 and J2) on the EVM that are normally installed.

One jumper connects the FG pin of the DRV10866 to a pull up resistor and the other jumper determines

whether FG is ½ or normal frequency output by connecting FGS to either VCC or GND.

For normal operation right out of the box both jumpers should be installed.

2.3.1 FGS Frequency Generator Select (J1) Jumper

J1 can be found in the image below, Figure 5. Installing the jumper connects the FGS pin on the

DRV10866 to GND. When the FGS pin is tied to GND, the FG output of the DRV10866 is set for normal

frequency output. With the jumper out, the FGS pin pulls up to VCC. When the FGS pin is tied to VCC, the

FG output of the DRV10866 is set for ½ of the original FG frequency. FGS is latched upon power to the

EVM so power must be cycled in order for the FG output to change.

Figure 5. J1 Location

DRV10866EVM User’s Guide SBVU020A–November 2012–Revised December 2012

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