Reference design for USB Type-C rechargeable battery packs
The reference design includes everything developers need to create dual-role port (DRP) applications with USB Type-C power delivery (PD), accelerating the development of new USB Type-C battery packs or migrating existing USB Type-A battery pack designs to USB Type-C. It includes a development board, USB Type-C PD stack, example code, schematics and a hardware manual.
The DRP battery pack reference design takes advantage of the PD stack included in Silicon Labs’ Simplicity Studio. The stack enables developers to make high-level function calls to negotiate and send USB Type-C messages to send or receive power. The board design gives developers control over the battery application and includes a button used to change the power direction between sink and source mode.
The Silicon Labs EFM8 Busy Bee MCU on the development board serves as a PD controller and provides design flexibility by negotiating a variety of power schemes. The reference design supplies 15W (3A @ 5V) and charges at 1.8A. The PD stack uses only a portion of the MCU’s capabilities, leaving many peripherals, memory and processing power available for developers to control regulators and power ICs, detect orientation, control switches, and update other hosts on status. By using the EFM8 Busy Bee MCU as a PD controller, developers can incorporate other useful functions including an integrated temperature sensor and an analog-to-digital converter (ADC) to monitor the battery pack’s temperature and voltage to prevent overheating or overcharging.
The USB Type-C rechargeable battery pack reference design including the SLRDK1000 development kit is priced at $50.
Silicon Labs; www.silabs.com/usb-type-c
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