Figure 3-2. RESET Circuit
3.9 Analog-Input-Board Connector (J28)
The
Analog-Input-Board
(AIB) connector allows for cross compatibility with several
Analog Plug-in Modules
(APMs) offered by TI. This generic connector provides access to common board connections such as analog
input, analog output, Fault and overtemperature warning (OTW) error reporting, common board voltages (12 V,
3.3 V, and so forth), and EVM reset. These plug-in modules allow for an application-specific front end to be
plugged into the TPA3223EVM with ease. Examples of plug-in modules include front ends for guitar amplifier,
karaoke, wireless sub-woofer, and front-end audio crossover.
Figure 3-3. AIB EVM Connector
As
shows, the AIB connector includes the following pins, associated specifications are listed in
Table 3-6. AIB Connector (J28) Pinout
Pin
#
Function
Description
Audio EVM
Input/Output
1
Amp Out A
Speaker-level output from audio Class-D EVM (SE or one side of BTL)
O
2
Amp Out B
Speaker-level output from audio Class-D EVM (SE or one side of BTL)
O
3
PVDD
PVDD voltage supply from audio Class-D EVM (variable voltage depending on Class-D EVM use)
O
4
GND
Ground reference between audio plug-in module and audio class-D EVM
-
5
NC
-
-
6
NC
-
-
7
3.3 V
3.3-V supply from EVM; used for powering Audio Plug-in Module
O
8
3.3 V
3.3-V supply from EVM; used for powering Audio Plug-in Module
O
9
12 V
12-V supply from EVM; used for powering Audio Plug-in Module
O
10
EN and RESET
Assert enable and reset control for audio class-D EVM (active low)
I
11
Analog IN_A
Analog audio input A (analog in EVM) , MCLK I2S Bus (digital in EVM)
I
12
NC
-
-
13
Analog IN_B
Analog audio input B (analog in EVM) , BCLK I2S Bus (digital in EVM)
I
14
CLIP_OTW
Clipping detection, overtemperature warning, or both from audio class-D EVM (active low)
O
15
Analog IN_C
Analog audio input C (analog in EVM) , FS/LRCLK I2S Bus (digital in EVM)
I
Hardware Configuration
14
TPA3223 Evaluation Module
SLAU874 – OCTOBER 2022
Copyright © 2022 Texas Instruments Incorporated