Flexible mobile device connectivity to automotive systems with USB hubs
A USB hub module which is configured to enable a vehicle's embedded USB host to connect to multiple mobile devices through a USB hub, regardless of whether the mobile devices are configured to act as USB hosts or USB devices, without providing USB OTG controllers or additional vehicle wiring or inhibiting functionality of consumer devices connected the module while one consumer device connected to the module operates in USB host mode. Preferably, the module is configured so that no additional cabling or hardware changes are required to the head unit. The module can be employed between the embedded USB host, USB hub and at least one consumer accessible USB port. When the consumer device is acting as a USB host, signals between the consumer device and the vehicle's embedded USB host are processed through a bridge, thereby rendering the consumer device compatible with the embedded USB host.
1. A Universal Serial Bus (USB) hub module, comprising:
an upstream USB port;
a plurality of downstream USB ports;
a USB hub interconnected to the upstream USB port and the plurality of downstream USB ports, said USB hub configured to broadcast data from the upstream USB port to each downstream USB port and to transmit data from each downstream USB port to the upstream USB port;
a USB bridge interconnected to the USB hub and configured to connect the upstream USB port to a USB host; and
a USB routing switch interconnected to the USB bridge, the USB hub, and the plurality of downstream USB ports, wherein the USB routing switch is configured to connect a first downstream USB port of the plurality of downstream USB ports to the upstream USB port through the USB bridge when a consumer device connected to the first downstream USB port is the USB host and is configured to initiate bidirectional communication with the upstream USB port, and wherein the USB routing switch is configured to connect the first downstream USB port directly to the USB hub when the consumer device connected to the first downstream USB port is configured to only respond to communication from the upstream USB port, thereby rendering the consumer device compatible with a device connected to the upstream USB port.
2. The USB hub module according to claim 1 , wherein the USB routing switch is configured to connect the first downstream USB port to the USB hub through the USB bridge when a first consumer device connected to the first downstream USB port is acting as the USB host, and wherein the USB routing switch is configured to simultaneously connect a second downstream USB port of the plurality of downstream USB ports directly to the USB hub when a second consumer device connected to the second downstream USB port is acting as a USB device, thereby rendering the first and second consumer devices compatible to communicate simultaneously with the upstream USB port.
3. The USB hub module according to claim 1 , wherein the USB hub module is configured to recognize whether the consumer device connected to the first downstream USB port is configured to act as the USB host or as a USB device and control the USB routing switch accordingly.
4. The USB hub module according to claim 1 , wherein the USB hub module is configured to dynamically switch operation of the plurality of downstream USB between a USB device mode and a USB host mode.
5. The USB hub module according to claim 1 , wherein the USB routing switch is configured to connect the consumer device to either the USB bridge or the USB hub based on whether the consumer device attached to each downstream USB port in the plurality of downstream USB ports is configured to act as the USB host or a USB device.
6. The USB hub module according to claim 1 , wherein the USB routing switch comprises a plurality of USB analog multiplexing switches.
7. The USB hub module according to claim 1 , wherein the USB bridge is configured to control the USB routing switch.
8. The USB hub module according to claim 1 , wherein the USB bridge comprises a bridge controller as well as endpoint buffers.
9. The USB hub module according to claim 8 , wherein the endpoint buffers are configured to support a USB data connection pipe between an infotainment system and the consumer device.
10. The USB hub module according to claim 1 , wherein the USB routing switch comprises digital routing logic.
11. The USB hub module according to claim 1 , wherein the USB hub module further comprises a logic circuit configured to provide data handshaking to negotiate electrical power transfer from the USB hub module to a first consumer device connected to the first downstream USB port, and wherein the USB hub module further comprises a power supply circuit configured to provide electrical power from the USB hub module to the first consumer device.
12. The USB hub module according to claim 11 , wherein the logic circuit includes a communication control stack.
13. The USB hub module according to claim 11 , wherein the power supply circuit includes adjustable voltage power supplies.
14. An integrated circuit, comprising:
a USB hub configured to be interconnected to an upstream USB port and a plurality of downstream USB ports, said USB hub configured to broadcast data from the upstream USB port to each downstream USB port and to transmit data from each downstream USB port to the upstream USB port;
a USB bridge interconnected to the USB hub and configured to connect the upstream USB port to a USB host; and
a USB routing switch interconnected to the USB bridge, the USB hub, and the plurality of downstream USB ports, wherein the USB routing switch is configured to connect a first downstream USB port of the plurality of downstream USB ports to the upstream USB port through the USB bridge when a consumer device connected to the first downstream USB port is the USB host and is configured to initiate bidirectional communication with the upstream USB port, and wherein the USB routing switch is configured to connect the first downstream USB port directly to the USB hub when the consumer device connected to the first downstream USB port is configured to only respond to communication from the upstream USB port, thereby rendering the consumer device compatible with a device connected to the upstream USB port.
15. The integrated circuit according to claim 14 , wherein the USB routing switch is configured to connect the first downstream USB port to the USB hub through the USB bridge when a first consumer device connected to the first downstream USB port is acting as the USB host, and wherein the USB routing switch is configured to simultaneously connect a second downstream USB port of the plurality of downstream USB ports directly to the USB hub when a second consumer device connected to the second downstream USB port is acting as a USB device, thereby rendering the first and second consumer devices compatible to communicate simultaneously with the upstream USB port.
16. The integrated circuit according to claim 14 , wherein the USB routing switch is configured to connect the consumer device to either the USB bridge or the USB hub based on whether the consumer device attached to each downstream USB port in the plurality of downstream USB ports is configured to act as the USB host or a USB device.
17. The integrated circuit according to claim 14 , wherein the USB bridge is configured to control the USB routing switch.
18. The integrated circuit according to claim 14 , wherein the integrated circuit further comprises a logic circuit configured to provide data handshaking to negotiate electrical power transfer from the USB hub module to a first consumer device connected to the first downstream USB port.
19. The integrated circuit according to claim 18 , wherein the logic circuit includes a communication control stack.