Datasheet

I/O Connector and Signals
3-3
Operation
Table 3−2 shows the function of the switch.
Table 3−2.Switch Function Reference
Reference
Designator
Setting Function
Factory
Default
Subsection
ON On-board I
2
S selected
SW1-1
OFF External I
2
S selected
ON 3.2.2
ON On-board MCLK selected
SW1 SW1-2
OFF External MCLK selected
ON 3.2.3
ON On-board SPI selected
SW1-3
OFF External SPI selected
ON 3.2.1
3.2.1 SPI Selection
The SPI bus on the TSC2100 provides the main interface between a
host-processor and the TSC2100 device. The on-board TAS1020B plays the
role of the host processor, if SW1-3 is set ON. If an external processor or SPI
device is used, set the SW1-3 to the OFF position so as to disable the on-board
SPI interface to the TAS1020B and open the TSC2100 SPI port to the external
SPI bus.
3.2.2 I
2
S Selection
The I
2
S bus on the TSC2100 can interface with the onboard host processor,
the TAS1020B USB controller, or with other offboard external I
2
S praocessor
or devices. When SW1-1 is set ON, the manufacture default, the TSC2100 I
2
S
is connected to the TAS1020B’s I
2
S. Otherwise, if SW1-1 is shifted to OFF, the
buffer between the on board I
2
S port is disabled so that an external I
2
S can
communicate with the TSC2100 I
2
S port.
3.2.3 MCLK Selection
The TSC2100 requires a proper MCLK for basic audio ADC/DAC functions.
The TAS1020B onboard processor generates an 11.2896-MHz frequency to
provide the MCLK. If an external MCLK is preferred, SW1-2 should be turned
off.
3.3 I/O Connector and Signals
The various connectors on the TSC2100EVM are described in this section.
3.3.1 Audio Connectors
The TSC2100 audio inputs and outputs are routed through these stereo
(TIP/RING/SLEEVE) 3.5-mm jacks. Note the polarity of the channel
assignments for these connectors.