3.1 Configure the hardware
This section summarizes the overall setup. Detail description is provided in the user guide.
Suggested equipment's needed for test:
- 8.0 V to 40 V power supply
- Mini USB type A Cable
3.2 Configuration image
3.3 Device Considerations
It is recommended to learn about OTP before operating with the device. The device has a high level of flexibility due to parameter configuration available in the OTP. This impacts the functionality of the device. It is key to understand how OTP parameters can be programmed, the interaction with mirror registers and the FS85 SoC. The OTP related operations can be performed either in Emulation mode, where the product uses a given configuration if the power supply is not switched Off or from OTP fuse content that is valid even after a power down/power up sequence.
Note: The board is delivered without any OTP configuration on the associated device. To fuse the OTP first time, see user guide section on "OTP programming fuse mode steps" and use the FS85_OTP_Configuration.xls spreadsheet.
3.4 Setting up the board
1. Prior to starting your work in Debug mode, you need to start with the following configuration:
Plug jumper J17 1-2 (connect 5.0 V on DBG pin from the USB).
- Place SW1 in the middle position (VBAT Off).
- Open SW3 (OTP programming Off).
- Open SW2 (WAKE1).
2. Connect your board to the computer with the USB cable, and to the power supply (typically set to 12 V).
3. Launch FlexGUI (see Section 7.2 "Using FlexGUI").
4. To operate in Debug mode:
- Place SW1 in TOP direction (VBAT switched On).
- Close SW2 (WAKE1).
5. At this step, the device is in Debug mode, all regulators are turned Off.
The user can load the mirror registers to work in OTP emulation. See Section 7.2.3 "Script editor" of the UM11183 user guide.
6. If the mirror register is not filled, the OTP fuse configuration, if any, will be used.
7. Unplug jumper J17 1-2.
At this step, the device will start with the mirror configuration setting (either loaded in Emulation mode, or from the OTP fuse). If the mirror was not filled and the OTP fuse not burned, then the device will not start up.
If initialization phase is not closed by a first good WD_Answer, the WD will not start and regulators will stay alive. Also, if Debug mode is not exited by writing FS_STATES:[DBG_EXIT] bit to 1, the FS0b pin cannot be released.
3.5 Additional Board Support
Detailed configuration, OTP device programming modes, closing the initialization phase and images are available in the User Guide. Refer UM11183.