+HDGHU IRU *8,¶V
Hardware Reset
Onboard EEPROM
Test Points for Digital
Audio Signals
Test Points for
I²C Signals
EVM Description and Basics
10
SLAU738 – September 2017
Copyright © 2017, Texas Instruments Incorporated
TLV320AIC3109EVM-K
2.3
Digital Signals
2.3.1
Digital Inputs and Outputs
The digital inputs and outputs of the EVM can be monitored through J4 and J5. If external signals need to
be connected to the EVM, digital inputs should be connected via J14 and J15 on the USB-MODEVM and
the SW2 in the motherboard switch should be changed accordingly (see
). The connector
details are available in
The EVM features test points to directly measure the digital audio signals coming from the USB-MODEVM
board. Additionally, test points are provided to monitor the I²C control signals. A header to connect the
RESET pin of the codec with hardware reset signal from the motherboard is provided. This is useful so the
user can perform a hardware reset for the audio codec from the GUI without any board modification. The
digital section of the TLV320AIC3109EVM is shown in
.
Figure 5. Digital Section of the TLV320AIC3109EVM
2.4
Power Connections
The TLV320AIC3109EVM requires three power supplies to fully evaluate the audio codec:
•
+5-V power supply, required to ge3.3-V supply from the integrated low-dropout voltage
regulator (U1) to feed analog power supplies of the codec (AVDD and DRVDD).
•
+1.8-V power supply, required to feed the digital core voltage supply (DVDD) and digital input and
output voltage supply (IOVDD) of the codec. The selection for the digital input and output voltage
(IOVDD) is made via IOVDD SEL header (J22).
•
+3.3-V power supply, required for digital input and output voltage supply (IOVDD) of the codec.
The EVM can be powered by external power supplies when being used in stand-alone operation or by the
USB-MODEVM when it is plugged onto the motherboard. The following sections discuss each operation
mode.
