Datasheet

Introduction

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2.3 Jumpers

There are four jumpers (J1 – J4) on the EVM that are normally installed.

Jumper J1 connects the FR pin of the DRV11873. When installed, the pin is set low for forward rotation.

When removed, the pin is pulled high and the motor will spin in reverse.

Jumper J2 connects the FS pin of the DRV11873 to adjust for different speed selections for various

applications. When installed, the FS pin is set to pull low. When J2 is open, the FS pin pulls high.

Jumper J3 connects the FG pin of the DRV11873 to an onboard pull-up resistor to 5 V. Remove jumper J3

if the use of an external pull-up resistor is desired.

Jumper J4 is used to connect the RD pin of the DRV11873 through a pull-up resistor to 5 V. When

removed, the pin will float.

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

Figure 2. Jumper Settings

2.3.1 FR Forward and Reverse (J1) Jumper

J1 can be found in Figure 2 . Installing the jumper connects the FR pin on the DRV11873 to GND. When

the FR pin is tied to GND, the motor is set to spin in forward rotation. When removed, the pin is pulled

high and the motor will spin in reverse. FR is latched upon power to the EVM so power must be

cycled in order for the motor direction to change.

2.3.2 FS Frequency Select (J2) Jumper

J2 can be found in Figure 2 . Installing the jumper connects the FS pin on the DRV11873 to GND. When

the FS pin is tied to GND, the DRV11873 is set for optimized startup for low fan speed motors with high

motor winding resistance and high inductance. With the jumper out, the FS pin pulls up to VCC through a

pull-up resistor. When the FS pin is tied to VCC, the DRV11873 is optimized for startup for high speed fan

motors with low motor winding resistance and high inductance. FS is latched upon power to the EVM so

power must be cycled in order for the FS output to change.

DRV11873 Evaluation Module SLWU083A–February 2013–Revised April 2013

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