Operation
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2.1.1
Initial Configuration
The DRV8601ZQVEVM can be operated in three configurations:
1. Pseudo-differential feedback with internal reference
2. Pseudo-differential feedback with external reference
3. Differential feedback with external reference
describes how to set up the DRV8601ZQVEVM for the above three configurations.
Table 1. Configuration Settings
No. Configuration
JP1
R5
C5
R2
REFIN
1
Pseudo-differential feedback with internal reference
Connect jumper between DNP
DNP
DNP
NA
2 and 3
2
Pseudo-differential feedback with external reference
Connect jumper between DNP
DNP
49.9
VDD (for
(default)
1 and 2
k
Ω
VDD/2
reference)
3
Differential feedback with external reference
Connect jumper between 100 k
Ω
0.01
DNP
VDD (for
1 and 2
ufd/16V
VDD/2
reference)
The EVM is pre-assembled to operate in the second configuration with a low-pass corner frequency of 159
Hz. For all three configurations, choose R4 and C4 to set the corner frequency according to the equation
f
3dB
= 1/(2×
p
×R4×C4). For the third configuration, choose R5 = R4 and C5 = C4 for proper operation.
2.1.2
Power and Ground
For all three configurations:
1. Set the voltage of an external power supply between 2.5 V and 5.5 V and turn it OFF.
2. Attach the ground connection of the power supply to the GND header pin of the EVM, and then
connect the positive supply to the VDD header pin. Verify that the connections are made to the correct
header pins.
2.1.3
Inputs and Outputs
2.1.3.1
Vibration Input
1. Make sure that the signal source is set to the minimum level.
2. Connect the signal source to the IN header pin on the EVM.
3. Connect the actuator (ERM or LRA) between OUT+ and OUT–.
2.1.3.2
Enable Settings
The DRV8601ZQV has an active high enable pin EN. A high value on this pin places the device in the
operating mode, and a low value on this pin places it in the shutdown mode. Press and hold pushbutton
S1 to place the DRV8601ZQVEVM in the shutdown mode. Release pushbutton S1 to restart normal
operation.
2.1.3.3
Gain Settings
DC gain of the device is given by 2×R4/R1 for the pseudo-differential configurations, and R4/R1 for the
differential configuration. R5, when used, must be well matched with R4 for proper performance. The
DRV8601ZQVEVM is pre-configured for a pseudo-differential gain of 4 V/V and a differential gain of 2V/V.
2.2
Power Up
1. Verify the correct connections as described in Sections 2.1.
2. Verify the voltage setting of the power supply is between 2.5 V and 5.5 V, and turn on the power
supply. Proper operation of the EVM begins.
3. Adjust the audio signal source as needed.
2
DRV8601ZQVEVM ERM/LRA Driver Evaluation Module
SLOU296 – July 2010
Copyright © 2010, Texas Instruments Incorporated
