Datasheet

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Introduction

2.3.3 FS Frequency Generator (J3) Jumper

J3 can be found in Figure 2 . Installing the jumper will connect the FG pin of the DRV11873 to an on board

pull-up resistor. If you wish to make an external connection to FG, the jumper can be removed and the FG

test point provides a direct connection to the FG pin of the DRV11873. The FG test point is highlighted in

Figure 3. Please note that if the jumper is removed, an external pull-up resistor is needed for connection

of FG to an external system. For more information regarding the FG pin please refer to the DRV11873

datasheet (SLWS237).

Figure 3. FG Test Point

2.3.4 RD Rotation Detection (J4) Jumper

The RD pin is an open-drain output which is tied to 5 V through a pull-up resistor when J4 is in place. In

this case, the pull-up resistor value (R8) is 100 kΩ. During the lock protection condition, RD output

remains high until the lock protection is dismissed and restart completed. With J4 removed, the pin will

float when the lock protection condition occurs. The jumper allows for external pull-up resistors to be used

to change the value of RD when lock detection takes place. Please refer to the datasheet of the

DRV11873 for more information regarding the RD pin.

SLWU083A–February 2013–Revised April 2013 DRV11873 Evaluation Module

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