Texas Instruments TSC2301EVM Evaluation Module TSC2301EVM TSC2301EVM Datenbogen

3-2

The following table shows the function of each jumper on the EVM:

1 to 2

SPI POL select pin = 0 V

JMP1

2 to 3

SPI POL select pin = 3.3 V

2 to 3

3.1.1

JMP2

1 to 2

LINE IN left attenuator

Installed

3.1.2

JMP3

1 to 2

LINE IN right attenuator

Installed

3.1.2

1 to 2

MIC BIAS from fixed resistor

JMP4

2 to 3

MIC BIAS from TSC2301

2 to 3

3.1.3

1 to 2

PWR select: USB powered

JMP5

2 to 3

PWR select: External power supply

1 to 2

3.1.4

JMP6

1 to 2

A1 select for EEPROM

Installed

3.1.5

The TSC2301 allows for SCLK polarity selection for the SPI bus. Pulling the
POL pin of the TSC2301 to either VCC or to ground makes this selection. With
POL pulled to VCC, the part operates as shown in the Timing Diagram on Page
8 of the TSC2301 data sheet. (SCLK is low when idle, first edge is a rising
edge; data is clocked in on falling edges.)

With POL pulled to GND, the polarity of SCLK in this diagram is reversed.
(SCLK is high when idle; first edge is a falling edge; data is clocked in on rising
edges.)

The TSC2301EVM provides attenuators on each of the LINE IN signal inputs.
These may be bypassed by installing JMP2 or JMP3 for left and right channel
attenuators, respectively.

JMP4 selects for microphone bias to come from the TSC2301 itself, or from
an external resistor, R15, which is not installed on the TSC2301EVM board.
If an external bias is needed, the appropriate size resistor may be soldered in
to the R15 location on the board and JMP4 set to connect between positions
1 and 2. If no mic bias is required, either leave JMP4 connected between
positions 2 and 3 and turn off the TSC2301’s mic bias under software control,
or do not install the jumper top for JMP4 in any position.

The TSC2301EVM may be powered from the USB port directly, or an external
power supply may be provided through J8. JMP5 selects between these two
power sources.