BCM4356XKWBGT Datasheet, PDF (55/195 Pages) Cypress Semiconductor – Single-Chip 5G WiFi IEEE 802.11ac 2×2 MAC/ Baseband/Radio with Integrated Bluetooth 4.1, FM Receiver, and Wireless Charging

BCM4356 Advance Data Sheet
USB Interface
USB Interface
Features
The following USB interface features are supported:
• USB Protocol, Revision 2.0, full-speed (12 Mbps) compliant including the hub
• Optional hub compound device with up to three device cores internal to device
• Bus or self-power, dynamic configuration for the hub
• Global and selective suspend and resume with remote wakeup
• Bluetooth HCI
• HID, DFU, UHE (proprietary method to emulate an HID device at system bootup)
• Integrated detach resistor
Operation
When the A4WP feature is not used and USB is selected as the Bluetooth interface to the host, an external pull-
up (outside the chip) 10 KΩ resistor to BT_VDDIO is required. The pull-up is not necessary but is recommended
when the Bluetooth/host interface is UART instead of USB.
The BCM4356 can be configured to boot up as either a single USB peripheral or a USB hub with several USB
peripherals attached. As a single peripheral, the host detects a single USB Bluetooth device. In hub mode, the
host detects a hub with one to three of the ports already connected to USB devices (see Figure 19).
Figure 19: USB Compounded Device Configuration
Host
USB Compounded Device
Hub Controller
USB Device 1
HID Keyboard
USB Device 2
HID Mouse
USB Device 3
Bluetooth
Depending on the desired hub mode configuration, the BCM4356 can boot up showing the three ports
connected to logical USB devices internal to the BCM4356: a generic Bluetooth device, a mouse, and a
keyboard. In this mode, the mouse and keyboard are emulated devices, since they connect to real HID devices
via a Bluetooth link. The Bluetooth link to these HID devices is hidden from the USB host. To the host, the mouse
and/or keyboard appear to be directly connected to the USB port. This Broadcom proprietary architecture is
called USB HID Emulation (UHE).
Broadcom^®
May 8, 2015 • 4356-DS103-R
BROADCOM CONFIDENTIAL
Page 54