Datasheet

Jumpers
3-4
3.2.1 Power Supply Current Measurement
Six jumpers are on the front of the six power supply pins of the TSC2101. The
jumpers can be replaced by current meters that measure and monitor the
currents to the corresponding power supply pins. Refer to Table 2−1, Note 2.
3.2.2 MIC BIAS Selection
JMP3 selects the handset microphone bias to come from the TSC2101
(MICBIAS_HND pin) or from an external resistor, R14, which is not installed
on the TSC2101EVM board. If an external bias is needed, the appropriate size
resistor can be soldered into the R14 location on the board, and JMP3 is set
to connect between positions 1 and 2. If the microphone bias is not required,
do not install the jumper top for JMP3 in any position.
3.2.3 MIC Input Selection
The headset microphone input MICIN_HED and the handset microphone
input MICIN_HND can be connected to the TSC2101 device in single-ended
mode.
Differential microphone input is selected using pins MICIN_HED and
AUX1/AUX2 as a differential input pair; and/or by using the pins MICIN_HND
and AUX1/AUX2 as differential input pair, selected through bits 5 to 7 (D5, D6,
D7) in the TSC2101 control register page 02 and address 0x03. If a differential
microphone input is selected, the JMP4 must be set to provide the
AUX1/AUX2 with microphone bias. Table 3−3 gives the JMP4 settings
corresponding to the selected differential inputs.
Table 3−3.JUMP4 Settings Reference
Reference
Designator
Setting MICIN Selection
JMP4
All removed Single-Ended MICINs
4 to 6 MICIN_HED and AUX1 differential pair
4 to 2 MICIN_HED and AUX2 differential pair
3 to 5 MICIN_HND and AUX1 differential pair
3 to 1 MICIN_HND and AUX2 differential pair
3.2.4 EEPROM A1 Select
The TSC2101EVM loads its firmware from an onboard EEPROM. In order to
use the firmware in this EEPROM, its A1 address line must be pulled low;
therefore, JMP5 should stay installed for normal use.
This jumper can be removed when firmware updates are to be made.
3.2.5 Power Supply Selection
The TSC2101EVM can be powered from the USB port directly, or an external
power supply can be provided through J11 or J12. JMP6 allows the user to
select either the USB or external power sources.