DRV2603ERM Datasheet, PDF (13/28 Pages) Texas Instruments – DRV2603 ERM/LRA Haptic Driver Evaluation Kit

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MSP430 Control and Firmware
OUT+
OUT-
ERM
or
LRA
Ch 1
Ch1-Ch2
(Differential)
Ch2
with Digital
Low-Pass Filter
Oscilloscope
Figure 15. Measuring the DRV2603 Output with a Digital Low-pass Filter
An analog 1st order, low-pass, RC filter can also be used; however, care must be taken not to use a filter
impedance that is too low. Low filter impedance can affect the back-EMF of the actuator and interfere with
the auto-resonance detection algorithm. See the recommend values in Figure 16.
100k
OUT+
OUT-
ERM
Or
LRA
100k
470 pF
470 pF
Ch1
Ch1-Ch2
Ch2 ^{(Differential )}
Oscilloscope
Figure 16. Measuring the DRV2603 Output Signal with an Analog Low-pass Filter
5 MSP430 Control and Firmware
The DRV2603EVM-CT is controlled by a programmable MSP430. This section contains information for
programming and controlling the board using the MSP430.
5.1 Additional Hardware Modes
Additional modes are available on the DRV2603EVM-CT that provide increased board control and
functionality. The additional modes are not available in “demo” mode, but can be access by switching to
“binary counting mode”. In “binary counting mode” the mode LEDs count in binary (32 modes) rather than
in “demo” mode format (only 6 modes including off).
5.1.1 Enter Binary Counting Mode
To enter “binary counting mode” and access the additional modes:
1. Press and hold the increment mode button (“+”) for approximately 3 seconds.
2. Release the button when the actuator buzzes and the mode LEDs flash.
3. Select from the “binary counting modes” using the “+” and “-“ buttons.
All modes, including “demo” modes, are available in binary counting mode, see Table 3 for a description.
5.1.2 Exit Binary Counting Mode
To exit “binary counting mode” and return to “demo” mode:
1. Press and hold the decrement mode button (“-“) for approximately 3 seconds.
2. Release the button when the actuator buzzes and mode LEDs flash.
3. Select from the “demo” modes using the “+” and “-“ buttons.
SLOU340A – May 2012 – Revised May 2012
DRV2603 ERM/LRA Haptic Driver Evaluation Kit
13
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