Introduction to Microchip Touch Bridge
Getting Started with Microchip Touch Bridge
Reference Materials
The Microchip Touch Bridge (MTB) will become the universal bridge for all Microchip touch solutions–turnkey products and touch library-based applications on MCUs. A bridge is used during the development process to read out raw data and adjust settings accordingly.
The tool for data visualization is also integrated. The MTB’s intended tool for touch tuning is the MPLAB® Data Visualizer.
You can find training videos and step by step guides on
Power Supply Selection
The board can be powered alternatively through
- USB power
- External power source
USB Powered Bridge and Target
When MTB is powered from USB source Insert JS1 between J2 header Pin1-2 and insert JS2 between J4 header Pin 3-4.
External Supply Powered Bridge and Target
When MTB is powered from an external source (with a supply voltage of 1.8V-5V) please feed to J4 Pin: 3 and supply GND to Pin: 19. Do not place jumper JS2.
| Jumper mode selection | USB supply to bridge and target board | External supply to bridge and target board | USB supply to bridge and external supply to target board |
|---|---|---|---|
| Jumper J2 | Short pin 1-2 | Short pin 2-3 | Short pin 1-2 |
| Jumper J4 | Short pin 3-4 | Open pin 3-4 | Open pin 3-4 |
| EXTVDD | - | EXTVDD to J4 pin 3 and GND pin 19 | EXTVDD to J4 pin 3 and GND pin 19 |
Application Mode Selection
Mode of operation: The application mode can be selected by the following switch settings (mode selector switch).
| Switch Mode | SW4 | SW3 | SW2 | SW1 | Mode of Operation | Bluetooth | USB COM | USB MSD | CAP Bridge |
|---|---|---|---|---|---|---|---|---|---|
| 0 | OFF | OFF | OFF | OFF | UART Bypass - 9600 | N | Y | N | N |
| 1 | OFF | OFF | OFF | ON | UART Bypass- 19200 | N | Y | N | N |
| 2 | OFF | OFF | ON | OFF | UART Bypass- 38400 | N | Y | N | N |
| 3 | OFF | OFF | ON | ON | UART Bypass- 115200 | N | Y | N | N |
| 4 | OFF | ON | OFF | OFF | UART Bypass- 9600 | Y | N | N | N |
| 5 | OFF | ON | OFF | ON | UART Bypass- 19200 | Y | N | N | N |
| 6 | OFF | ON | ON | OFF | UART Bypass- 38400 | Y | N | N | N |
| 7 | OFF | ON | ON | ON | UART Bypass- 115200 | Y | N | N | N |
| 8 | ON | OFF | OFF | OFF | Reserved | N | N | N | N |
| 9 | ON | OFF | OFF | ON | Reserved | N | N | N | N |
| 10 | ON | OFF | ON | OFF | Reserved | N | N | N | N |
| 11 | ON | OFF | ON | ON | Reserved | N | N | N | N |
| 12 | ON | ON | OFF | OFF | Reserved | N | N | N | N |
| 13 | ON | ON | OFF | ON | Test Mode | N | N | N | N |
| 14 | ON | ON | ON | OFF | Cap Bridge | N | N | N | Y |
| 15 | ON | ON | ON | ON | Bootloader | N | N | Y | N |
Note 1: The bootloader is never bypassed. If there is no valid application present in the application region of Flash, the control stays in the bootloader until a valid HEX file is dropped.
Note 2: It is required to do a power cycle after changing a mode (i.e., once you choose a mode, you must open and short the J2 pin jumper).
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