User Manual

Bluegiga Proprietary Version 1.0
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10.7 D
ETACH AND WAKE_UP SIGNALLING
WRAP THOR 2022-1 can provide out-of-band signalling to a host controller by using the dedicated
control lines called ‘USB_DETACH’ and ‘USB_WAKE_UP’. These are outside the USB
specification (no wires exist for them inside the USB cable), but can be useful when embedding
WRAP THOR 2022-1 into a circuit where no external USB is visible to the user. Both control lines
are shared with PIO pins and can be assigned to any PIO pin by setting the Persistent Store Keys
PSKEY_USB_PIO_DETACH (0x2ce) and PSKEY_USB_PIO_WAKEUP (0x2cf) to the selected
PIO number).
USB_DETACH, is an input which, when asserted high, causes WRAP THOR 2022-1 to put
USB_D- and USB_D+ in a high-impedance state and to 1.5kY pull-up resistor on USB_D+. This
detaches the device from the bus and is logically equivalent to unplugging the device. When
USB_DETACH is taken low, WRAP THOR 2022-1 will connect back to USB and await
enumeration by the USB host.
USB_WAKE_UP, is an active high output (used only when USB_DETACH is active) to wake up
the host and allow USB communication to recommence. It replaces the function of the software
USB WAKE_UP message (which runs over the USB cable proper), and cannot be sent while
WRAP THOR 2022-1 is effectively disconnected from the bus.
10.8 USB D
RIVER
A USB Bluetooth device driver is required to provide a software interface between WRAP THOR
2022-1 and Bluetooth applications running on the host.
10.9 USB 1.1 C
OMPLIANCE
WRAP THOR 2022-1 is qualified to the USB specification v1.1, details of which are available from
http://www.usb.org. The specification contains valuable information on aspects such as PCB track
impedance, supply inrush current and product labeling.
Although WRAP THOR 2022-1 meets the USB specification, CSR cannot guarantee that an
application circuit designed around the chip is USB compliant. The choice of application circuit,
component choice and PCB layout all affect USB signal quality and electrical characteristics. The
information in this document is intended as a guide and should be read in association with the USB
specification, with particular attention being given to Chapter 7. Independent USB qualification
must be sought before an application is deemed USB compliant and can bear the USB logo. Such
qualification can be obtained from a USB plugfest or from an independent USB test house.
Terminals USB_D+ and USB_D- adhere to the USB specification 1.1 (Chapter 7) electrical
requirements.
For ac and dc specifications for terminals USB_DETACH, USB_WAKE_UP, USB_PULL_UP and
USB_ON, refer to section 9.10 PIO specification.
10.10 USB 2.0 C
OMPATIBILITY
WRAP THOR 2022-1 is compatible with USB specification 2.0 masters; under these circumstances
the two ends agree the mutually acceptable rate of 12Mbits/s according to the USB 2.0
specification.