2 Firmware Boot Code Brief

The firmware boot code of the device has two primary functions:

1. Device initialization.
2. Patch bundle loading and configuration.

When the device is powered and in Active Mode, LDO_3V3 is enabled and a power-on reset (POR) signal is issued. The digital core receives this reset signal and loads the boot code from the internal ROM, and then begins initializing the device settings. This initialization includes enabling and resetting internal registers, loading initial values and configuring the I2C addresses of the device. The boot code will also measure the resistance on the TVSP pin and decode a TVSP Index value. Depending on the Boot Mode selected, the device will accept patch bundles from either an external EEPROM or host controller such as an MCU. The various TVSP configurations and the corresponding boot sequences of the device are detailed in Appendix A: TVSP Boot Configuration Settings.