Texas Instruments DRV8662EVM - DRV8662 Evaluation Module DRV8662EVM DRV8662EVM Datenbogen
Produktcode
DRV8662EVM
DRV8662
EXTIN-
EXTIN+
General Operation
To use an external PWM source to drive the DRV8662, follow these instructions to modify the board.
1. Disconnect the MSP430 output pins from the DRV8662 input pins by removing jumpers JP2 and JP3.
2. Depending on the input source, follow the instructions in the
section to adjust the input filter.
3. Connect DRV8662 control signals:
(a) Use the onboard MSP430 to control the EN, GAIN0, and GAIN1 pins. Using the onboard push
button (TRIG), select an external analog/PWM input mode and appropriate gain setting from
. The MSP430 must be set to an even number output mode with a constant voltage on the
DRV8662 EN, GAIN0, and GAIN1 pins; otherwise, the output will pulse during operation. The
ACTIVE LED will glow solid if a constant voltage waveform is selected.
ACTIVE LED will glow solid if a constant voltage waveform is selected.
(b) Use an external controller. Remove resistors R15, R16, and R19 to disconnect the MSP430 from
the EN, GAIN0, and GAIN1 pins. Then solder three control wires to the resistor pads.
4. Connect the positive terminal of the input signal source to EXTIN+ and the negative terminal to
EXTIN–.
5. Enable the power supply.
3.3.3
External Analog Input Mode
Figure 5. External Analog Input Mode
To use an external analog source (sine wave) to drive the DRV8662, follow these instructions to modify
the board.
the board.
1. Disconnect the MSP430 output pins from the DRV8662 input pins by removing jumpers JP2 and JP3.
2. Modify the input filter according to the
section. The default
PWM filter is no longer necessary.
3. Connect the DRV8662 control signals:
(a) Use the onboard MSP430 to control the EN, GAIN0, and GAIN1 pins. Using the onboard push
button (TRIG), select an external analog/PWM input mode and appropriate gain setting from
. The MSP430 must be set to an even number output mode with a constant voltage on the
DRV8662 EN, GAIN0,and GAIN1 pins; otherwise, the output will pulse during operation. The
ACTIVE LED will glow solid if a constant voltage waveform is selected.
ACTIVE LED will glow solid if a constant voltage waveform is selected.
(b) Use an external controller. Remove resistors R15, R16, and R19 to disconnect the MSP430 from
the EN, GAIN0, and GAIN1 pins. Then solder three control wires to the resistor pads.
4. Connect the positive terminal of the input signal source to EXTIN+ and the negative terminal to
EXTIN–.
5. Enable the power supply.
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DRV8662 Piezo Haptics Driver Evaluation Module
SLOU319A – August 2011 – Revised December 2012
Copyright © 2011–2012, Texas Instruments Incorporated