TPS257xx-Q1 Firmware Update With a Host

Abstract

The TPS2576x-Q1 and TPS2577x-Q1 are fully-integrated USB Type-C® Power Delivery (PD) management devices targeting automotive USB Type-C charging applications. For some application scenarios, customers might need to update the firmware for the device. This application note covers the TPS2576x-Q1/TPS2577x-Q1 firmware update process using an embedded device such as an MCU. The TPS2576x-Q1/TPS2577x-Q1 stores the boot and application code on its internal ROM, and is able to accept patch bundles (containing application configuration and code patch) from an external host or EEPROM over I2C.

Trademarks

USB Type-C® is a registered trademark of USB Implementers Forum.

All trademarks are the property of their respective owners.

1 Purpose and Scope

This application note details the TPS2576x-Q1/TPS2577x-Q1 firmware update process. The TPS2576x-Q1/TPS2577x-Q1 firmware, which includes the boot and application code, is stored in the ROM to execute device functionality. The device can then accept patch bundles (containing code patch and application configuration) from an external host or EEPROM over the I2C bus and is stored in the SRAM. The patch bundles can be generated using the TPS2576x-Q1/TPS2577x-Q1 application customization tool (TPS257XX-Q1-GUI on TI's website). To learn more about the GUI, see the TPS257XX-Q1-GUI Configuration Guide.

2 Firmware Boot Code Brief

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

Device initialization.
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.