Datasheet

Switches
3-2
3.1 Switches
Table 3−1 shows the function of each switch on the EVM.
Table 3−1.Switch Function Reference
Reference
Designator
Setting Function
Factory
Default
Subsection
ON 1.8-V power supply enabled
SW1−1
OFF 1.8-V power supply disabled
ON 3.9-V power supply enabled
SW1 SW1−2
OFF 3.9-V power supply disabled
ON 3.1.1
ON 3.3-V power supply enabled
SW1−3
OFF 3.3-V power supply disabled
ON Onboard I2S selected
SW2−1
OFF External I2S selected
ON 3.1.3
ON Onboard MCLK selected
SW2−2
OFF External MCLK selected
ON 3.1.4
SW2
ON Onboard SPI selected
SW2−3
OFF External SPI selected
ON 3.1.2
ON USB reset connected to the TSC2101
SW2−4
OFF USB reset is not connected to the TSC2101
ON 3.1.5
CAP Output to headset jack with CAPs
SW3
CAPLESS Output to headset jack without CAPs
CAPLESS 3.1.6
3.1.1 Power Supply Selection
SW1 enables or disables the onboard power supplies, including the 1.8 V, the
3.3 VA, and the 3.9 V, so that the power up/down performance of the TSC2101
can be evaluated. The 1.8 V provides the 1.8-V digital core power for the
TSC2101; the 3.3 VA provides the analog power supply for the TSC2101; and
the 3.9 V gives the analog driver power for the TSC2101.
Note that the EVM board has four regulated power supplies. In addition to the
1.8 V, 3.3 VA and 3.9 V supplies, the forth power supply 3.3 V cannot be
disabled. This power supply provides the power for the TSC2101’s digital I/Os,
when selected, and the power for the USB control device TAS1020B.
3.1.2 SPI Selection
The SPI bus on the TSC2101 provides the main interface between a host
processor and the TSC2101 device. The onboard TAS1020B plays the role of
the host processor, if the SW2−3 is set ON. If an external processor or SPI
device is used, set the SW2−3 to the OFF position so as to disable the onboard
SPI interface and open the TSC2101 SPI port to the external SPI bus.