SLIU024 April   2022 DRV5033 , DRV5033

 

  1.   Trademarks
  2. 1Overview
  3. 2Hardware
  4. 3Operation
  5. 4Schematics, PCB Layout, and Bill of Materials
    1. 4.1 Schematics
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials

3 Operation

Quick Start Setup

The following instructions describe how to set up and use the EVM.

  1. Connect the EVM to a PC using a USB cable.
    1. Insert the micro USB cable into the EVM micro-USB receptacle.
    2. Plug the other end of the USB A terminal into a PC.

EVM Operation

The board is populated with three rocker switches as indicated in Figure 3-1. With each switch there are two Hall-effect switches and three LED indicators. When a rocker is in the default resting state, the magnets in the rocker top are sufficiently far from either Hall-effect switch such that neither operate point (BOP) is triggered, resulting into high outputs feeding into an XOR that drives the middle LED to turn on. When the rocker top is moved sufficiently far in one direction, the BOP of Hall-effect device in that direction will trigger, resulting in the corresponding LED to light up. Figure 3-2 shows how the LEDs for a given rocker switch light up based upon the rocker top position.

Figure 3-1 Rocker Switch Board
Figure 3-2 Rocker Switch Operation

Rocker Switch 4 Quadrant

The unpopulated rocker space allows the user to place a rocker switch of interest to them. This space has multiple locations at which a Hall-effect sensor can be placed. This allows the user to observe the impact of increasing sensor offset, which decreases the field observed by the sensor and thereby lowers the BOP threshold angle as shown in Figure 3-3. Alternatively, these alternate sensor placement locations provide the user with the option to evaluate the performance of in-plane devices like the TMAG5123 in a rocker switch design by making some minor modifications to the 3d print files and reorienting the magnet as seen in Figure 3-4.

Figure 3-3 Y-Offset With DRV5033
Figure 3-4 Y-Offset With TMAG5123

CAD files are available for the user to reuse and manipulate for their evaluation.

Rocker Switch 4 Setup

  1. Only DBZ 3-pin SOT-23 package devices are intended to be used.
  2. GND pin must be on the left-most column of solder pads.
  3. As indicated in Figure 3-5, 0-Ω resistors, wire, or solder bridges should be used to connect the device VCC pad to the board VCC as well as the device output to the board OUT4x pad.
  4. As indicated in Figure 3-5, a decoupling cap of at least 0.1 µF should be used between the VCC pads and GND pads.
Figure 3-5 Rocker 4 VCC and GND Connections