Brushed Motor Demo Application
4.4.2
GUI Walkthrough (Normal Mode)
illustrates the GUI in normal mode.
Figure 14. GUI (Normal Mode)
The numeric labels indicated in
are described in the following numbered list:
1. The nSLEEP button directly controls the nSLEEP pins of the DRV8848. Red indicates LOW (0 V) and
green indicates HIGH (3.3 V). Logic HIGH to enable device, logic LOW to enable low power sleep
mode and reset all internal logic.
2. The PWM slide controls the duty cycle of the applied voltage to the motor. The duty cycle directly
affects the speed of the motor.
3. The DIR and DECAY buttons control the direction and decay mode of the motor. See the DRV8848
datasheet
for more information on decay modes.
4. nFAULT will assert when the DRV8848 is reporting a FAULT condition. See the DRV8848 datasheet
for more information on the various FAULT conditions.
5. The DRV8848 can operate two brushed DC motors simultaneously with an output current up to 1-A
RMS. The DRV8848 can also parallel the outputs to deliver 2x the current to a single motor. This
button controls the DRV8848 output mode. Place the J3 jumper on the BoosterPack.
6. Revision number reported by the firmware
7. The voltage set by the R1 potentiometer on the BoosterPack (resistor divider from DVDD). This
voltage controls the current limit of the DRV8848.
8. Calculated current limit for the DRV8848
9. The equation for determining the current limit from the VREF voltage and RSENSE resistance.
12
BOOST-DRV8848
SLVUAE1 – December 2014
Copyright © 2014, Texas Instruments Incorporated
