Datasheet

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2.2 Default Configuration and Connections
2.2.1 USB-MODEVM
Table 1 provides a list of the SW2 settings on the USB-MODEVM. For use with the TLV320AIC3254EVM,
SW-2 positions 1, 3, 4, 5, 6, and 7 must be set to ON, whereas SW-2.2 and SW-2.8 must be set to OFF. If
the TLV320AIC3254EVM is to be used with an external audio interface, SW2.4 and SW2.5 also need to
be set to OFF and such interface must be connected as explained in Section 2.4
Table 1. USB-MODEVM SW2 Settings
SW-2 Switch Number Label Switch Description
1 A0 USB-MODEVM EEPROM I
2
C Address A0
ON: A0 = 0
OFF: A0 = 1
2 A1 USB-MODEVM EEPROM I
2
C Address A1
ON: A1 = 0
OFF: A1 = 1
3 A2 USB-MODEVM EEPROM I
2
C Address A2
ON: A2 = 0
OFF: A2 = 1
4 USB I
2
S I
2
S Bus Source Selection
ON: I
2
S Bus connects to TAS1020
OFF: I
2
S Bus connects to USB-MODEVM J14
5 USB MCK I
2
S Bus MCLK Source Selection
ON: MCLK connects to TAS1020
OFF: MCLK connects to USB-MODEVM J14
6 USB SPI SPI Bus Source Selection
ON: SPI Bus connects to TAS1020
OFF: SPI Bus connects to USB-MODEVM J15
7 USB RST RST Source Selection
ON: EVM Reset Signal comes from TAS1020
OFF: EVM Reset Signal comes from USB-MODEVM J15
8 EXT MCK External MCLK Selection
ON: MCLK Signal is provided from USB-MODEVM J10
OFF: MCLK Signal comes from either selection of SW2-5
2.2.2 TLV320AIC3254 Jumper Locations
Table 2 provides a list of jumpers found on the EVM and their factory default conditions.
Table 2. List of Jumpers and Switches
Default
Jumper Position Jumper Description
W1 2-3 When connecting 2-3, microphone bias comes from the MICBIAS pin on the device; when connecting 1-2, microphone (mic) bias is
supplied through TP8.
W2 Installed Connects onboard Mic negative terminal to the circuit.
W3 Installed Connects onboard Mic positive terminal to the circuit.
W4 Open Provides mic bias to J5.3 (disconnect W2 and W3 before installing this jumper). Use for stereo electret microphones only.
W5 Installed Provides mic bias to J5.2 and onboard Mic positive terminal.
W6 Installed Sets the mic bias resistance to 1 kΩ. Use for differential electret mic configurations.
W7 Installed Connects J5.3 and onboard Mic negative terminal to the circuit.
W8 2-3 Connects J5.3 and onboard Mic negative terminal to AVSS or 1-kΩ resistor.
W9 Open Connects 16-Ω load to HPL outputs.
W10 Open Connects 16-Ω load to HPR outputs.
W11 Open When installed, shorts across the output capacitor on HPL; remove this jumper if using AC-coupled output drive
W12 Open When installed, shorts across the output capacitor on HPR; remove this jumper if using AC-coupled output drive
W13 Installed When installed, it selects onboard EEPROM as firmware source.
W14 1-2 When set to 1-2, SCLK/MIC_DET is used for SPI SCLK. When set to 2-3, SCLK/MIC_DET is used for headset detection.
5
SLAU264A–October 2008–Revised September 2012 TLV320AIC3254EVM-K
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