Automotive USB charging rear seat charger
The USB rear-seat chargers provide power only (max of 100 W) with no USB data connectivity. If you also need video application support, please take a look at EZ-PD™ CCG7D CYPD7299-68LDXS.
EZ-PD™ CCG7Sand EZ-PD™ CCG7D are, respectively, single- and dual-port USB PD controllers with integrated DC-DC buck-boost controllers. Based on an Arm® Cortex® processor with 128 KB Flash and GPIOs, they can interface with the Board Control Modul (BCM) over the LIN interface. In order to do so, Infineon uses a proprietary software interface protocol called Host Protocol Interface (HPI).
EZ-PD™ CCG7S/D can receive OEM/Tier1 authenticated firmware with an external USB to Type-C dongle or over the LIN interface, it then uses Root of Trust Public Key (RoTPK), RSA-2048, and SHA-256 algorithms to validate the firmware before updating its internal Flash with the new firmware. This feature enables EZ-PD™ CCG7S/D to be up to date with the changing USB standards and any other firmware update that might be required for better functionality, even after the vehicle is out of the manufacturers´ production line.
EZ-PD™ CCG7S/D is the heart of the charger module, which integrates a 24 V LDO enabling the controller to be powered up from the automotive battery. The internal DC-DC buck-boost controllers drive the external dual H-bridge switching FETs. EZ-PD™ CCG7S/D integrates VCONN FETs to detect electronically marked USB Type-C cables that support 5A. It can accept up to 4 NTC thermistors to measure the temperature of the module, measurements that will be then used to throttle the output power.
EZ-PD™ CCG7S and EZ-PD™ CCG7D with integrated designs and automotive software offer the following value-added features for automotive applications:
- Dynamic load sharing between the USB-C ports
- Output power throttling based on temperature and battery voltages
- Authenticated firmware update
- Black box feature to store a number of fault occurrences for diagnostics
- Support for Programmable Power Supply (optional spec of USB-C Power Delivery)
- VBATT to GND short protection
- VBUS to CC short protection
