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SLYU047A – April 2018 – Revised May 2018
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Copyright © 2018, Texas Instruments Incorporated
DRV5055EVM
3.3
Circuitry
This section summarizes the DRV5055EVM components.
3.3.1
C1, J1, R1, and R2
J1 serves as the connector for an external MSP-FET Flash Emulation Tool to connect to the board.
C1, R1, and R2 are the additional passives required for the emulation tool to effectively communicate with
the MSP430FR4133 for the purposes of programming and debugging.
The MSPFETFlash can be obtained separately at
http://www.ti.com/tool/MSP-FET
. Alternatively, if an
MSP430FR4133 Launchpad is already available, that board can be configured to program the
DRV5055EVM microcontroller.
3.3.2
C2-C5, C29, C32, C36, C43
C2-C5 are the 1-µF supply bypass capacitors for the DRV5055.
C29, C32, C36, and C43 are the supply bypass capacitors for the MSP430FR4133, SN74LVC1G17,
LP5907MFX-3.3, TCA9535, and TS5A23159, respectively.
3.3.3
C8--C11, R3-R6
These components are used to form low-pass filters on the outputs of all of the DRV5055A
y
devices,
where
y
= 1 to 4. The capacitors also allow the ADC input node to remain relatively stable throughout the
ADC sample transition.
3.3.4
J2
J2 is the male USB connector that allows the device to be powered through a PC USB port or USB
adapter.
3.3.5
K1, R47, R48, R49
K1 serves as a slide switch that pulls GPIO extender TCA9535 GPIO pins P00, P01, and P02 either to
GND or to 3.3-V VCC through pullup resistors R47, R48, and R49.
3.3.6
R16 and S1
R16 is a pullup resistor that ties push-button switch S1 to the 3.3-V VCC when S1 is not pushed.
3.3.7
C55, R51, and U14
C55 and R51 form a low-pass filter with the push-button stimulus, and are used with SN74LVC1G17
Schmitt Trigger (U14) to mitigate the effects of debounce from the push-button.
3.3.8
U9-U12
U9-U12 Correspond to each of the gain variants of the DRV5055 device. The gains are arranged highest
to lowest with U9 being the A4 variant while U12 is the A1 variant.
3.3.9
U16 C33, C35, R19, R50
U16 is the LP590MFX-3.3 low dropout regulator (LDO) that converts the input voltage from the USB
power source to a stable 3.3 V.