User's Manual

11
Synchronous Serial Interface
This interface is a synchronous serial port interface (SPI) for interfacing with other digital devices. The
SPI port can be used for system debugging. It can also be used for programming the Flash memory.
UART
This interface is a standard Universal Asynchronous Receiver Transmitter (UART) interface for
communicating with other serial devices.
PCM / I
2
S / SPDIF Interface
This interface is a bi-directional serial programmable audio interface supporting PCM, I2S and SPDIF
formats.
NOTE: the S/PDIF interface is not recommended for use at this time due to an issue with the low-
level BlueCore05-MM firmware revision in use by iWRAP. The audio quality suffers because the
left and right channels get out of sync.
Audio Interface
The audio interface of WT32 has fully differential inputs and outputs and a microphone bias output. A
high-quality stereo audio Bluetooth application can be implemented with minimum amount of external
components.
Programmable I/O
WT32 has a total of 10 digital programmable I/O terminals. These are controlled by the firmware running
on the device.
Reset
WT32 has a reset circuitry that is used to reset the module in the startup to ensure proper operation of
the flash memory. Alternatively, the reset can be externally driven by using a WT32 reset pin.
802.11 Coexistence Interface
Dedicated hardware is provided to implement a variety of coexistence schemes. Channel skipping AFH
(Adaptive Frequency Hopping), priority signaling, channel signaling, and host passing of channel
instructions are all supported. The features are configured in firmware. Since the details of some
methods are proprietary (e.g. Intel WCS), please contact Bluegiga Technologies for details.