User's Manual

12
PCM_OUT
A CMOS output with a weak internal pull-down. Used in the PCM (pulse code modulation) interface to
transmit digitized audio. The PCM interface is shared with the I
2
S interface.
PCM_IN
A CMOS input with a weak internal pull-down. Used in the PCM interface to receive digitized audio. The
PCM interface is shared with the I
2
S interface.
PCM_CLK
A bi-directional synchronous data clock signal pin with a weak internal pull-down. PCMC is used in the
PCM interface to transmit or receive the CLK signal. When configured as a master, WT32 generates the
clock signal for the PCM interface. When configured as a slave, the PCMC is an input and receives the
clock signal from another device. The PCM interface is shared with the I
2
S interface.
PCM_SYNC
A bi-directional synchronous data strobe with a weak internal pull-down. When configured as a master,
TBM–CBC5 generates the SYNC signal for the PCM interface. When configured as a slave, the PCMS is
an input and receives the SYNC signal from another device.The PCM interface is shared with the I
2
S
interface.
USB_D+
A bi-directional USB data line with a selectable internal 1.5 kΩ pull-up implemented as a current source
(compliant with USB specification v1.2) An external series resistor is required to match the connection
to the characteristic impedance of the USB cable.
USB_D-
A bi -directional USB data line. An external series resistor is required to match the connection to the
characteristic impedance of the USB cable.
SPI_NCSB
A CMOS input with a weak internal pull-down. Active low chip select for SPI (serial peripheral interface).
SPI_CLK
A CMOS input for the SPI clock signal with a weak internal pull-down. TBM–CBC5 is the slave and receives
the clock signal from the device operating as a master.
SPI_MISO
An SPI data output with a weak internal pull-down.
SPI_MOSI
An SPI data input with a weak internal pull-down.
RF
This pin can be used when not using a chip antenna or w.fl connector of the module.
AUDIO_IN_P_RIGHT and AUDIO_IN_N_RIGHT