Datasheet

Jumpers
3-2
3.1 Jumpers
Table 3−1 shows the function of each jumper on the EVM.
Table 3−1.Jumper/Function Reference
Reference
Designator
Setting Function Factory Default Subsection
JMP1 1 to 2
Differential (MICIN and AUX) microphone
input
Not installed 3.1.1
1 to 2 MIC BIAS from fixed resistor
JMP2
2 to 3 MIC BIAS from TSC2100
2 to 3 3.1.2
JMP3 1 to 2 A1 select for EEPROM Installed 3.1.3
1 to 2 PWR select: USB powered
JMP4
2 to 3 PWR select: External power supply
1 to 2 3.1.4
3.1.1 Differential Microphone Input
The microphone signal can be input to the TSC2100 through the MICIN or
AUX, if the signal is single ended. In single-ended mode, JMP1 should be
removed. The microphone signal, if differential, can be connected to the
TSC2100 through J5 and to the TSC2100 MICIN and AUX pins. In differential
mode, JMP1 should be installed.
3.1.2 MIC BIAS Selection
JMP2 selects the microphone bias to come from the TSC2100 itself or from
an external resistor, R11, which is not installed on the TSC2100EVM board.
If an external bias is needed, the appropriate size resistor can be soldered into
the R11 location on the board and JMP2 set to connect between positions 1
and 2. If MIC BIAS is not required, do not install the jumper top for JMP2 in any
position.
3.1.3 EEPROM A1 Select
The TSC2100EVM loads its firmware from an onboard EEPROM. In order to
use the firmware in this EEPROM, its address A2, A1, A0 should be 000b.
JMP3 is used to pull the A1 line low so that the EEPROM is selected. When
A1 is not low, the EEPROM is not able to interface to the on-board TAS1020B
processor.
This jumper can be removed when firmware updates are to be made.
3.1.4 Power Supply Selection
The TSC2100EVM can be powered from the USB port directly, or an external
power supply can be provided through J9 or J10. JMP4 selects between the
USB and external power sources.
3.2 Switches
The SW1 switch on the board to gives users the option to select SPI and I
2
S
as well as MCLK signal resources.