ST FDA803S Manuale utente
Introduction
This document describes how to use the evaluation board in order to check FDA803S and FDA903S device’s performance.
For any other information and deeper details, refer to the FDA803S and FDA903S datasheets.
Evaluation board for FDA803S and FDA903S power amplifiers
UM2999
User manual
UM2999 - Rev 1 - March 2022
For further information contact your local STMicroelectronics sales office.
www.st.com
2General information
This evaluation board/kit is intended for use as ENGINEERING DEVELOPMENT, DEMONSTRATION, OR
EVALUATION PURPOSES ONLY and is not considered by ST Microelectronics to be a finished end-product
fit for general consumer use. People handling the product(s) must have electronics training and observe good
engineering practice standards.
This evaluation board/kit does not fall within the scope of the European Union directives regarding
electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore
is not requested to meet the technical requirements of these directives or other related directives.
UM2999
General information
UM2999 - Rev 1 page 3/21
3Board description
The board features a single channel Class-D amplifier able to deliver up to 10 W (14.4 V at 4 Ω), based on the
FDA903S (or FDA803S) and is intended to demonstrate the device capabilities.
Figure 1. Top view
Figure 2. Bottom view
UM2999
Board description
UM2999 - Rev 1 page 4/21
3.1 Board connection
The board can be connected directly to other ST modules such as the Extend Board Mini A2 and MiniA2 via
connector J10.
Figure 3. FDA903S Demo SA board + Extend board MiniA2 + Mini A2 board
To PC USB
Vbat
(optional)
R146
I2S ext.
Optical In
R12
R7
R13
(Bottom
side)
VCC
FDA903
Demo SA
Extender
board
MiniA2
Mini A2
J7, JP1-4 settings
required for audio
source selection
For information on the configuration and start-up procedures of the mentioned additional modules, dedicated
documentation is available (see Section 5 Quick start guide).
UM2999
Board connection
UM2999 - Rev 1 page 5/21
3.1.1 Connectors and connections
Power supply
The amplifier power supply (VCC) with a voltage value between 3.3 V and 18 V can be connected to the J5
terminal as shown by the markings on the board.
Outputs
The amplifier outputs are connected to the J1 terminals.
Board cascading
The bus expansion connectors J8-J9 make it possible to address and drive cascaded amplifier boards using the
same I2C control and I2S (TDM mode) signal lines.
3.2 Board options
Vbus voltage reference
An on-board voltage reference is used to supply the pull-up resistors connected to digital lines. In order to
measure the Vbus current consumption, J2 can be used.
Attention: Do not use J2 to connect an external voltage source.
Address selection
As described in the datasheet, it is possible to modify the I2C address of the device by suitably removing R7
or/and R6, and adding R15 or/and R16. However, no HW modification is required to set the I2C addresses if the
GUI is used through the Mini A2 board. The board is already configured to be used with the Mini A2 board (see
Section 5 Quick start guide).
HW Mute
The hardware muting/unmuting is controlled through the connector J10, in turn tied to the MUTE pin (J10 pin 31).
CD/Diag
The CD/DIAG function can be monitored through the J10 connector, in turn tied to the CD/DIAG1 and CD/DIAG2
pins (J10 pins 19 and 33).
Load current monitor (only for FDA903S)
The FDA903S is able to sense the current flowing through the load and communicate its value to the system host
micro.
Setting IB15[5] to ‘1’, the information is available to the host via I2C inside the read registers DB8 and DB9,
whereas setting IB2[2] to ‘1’, the real time information is available via I2S bus through the I2S_SDA2 data line.
UM2999
Board options
UM2999 - Rev 1 page 6/21
4Startup sequence
The following start-up procedure is recommended:
1. Connect J5 to a 14.4 V supply
2. Provide an I2S input signal (the device works as I2S slave, so the clock must be provided by the signal
source)
3. Load the device file (.dev) provided by ST
4. Load the default register setting file (.cfg), if available. If no .cfg file is available, the configuration set in
the .dev file is applied.
At the end of the sequence, the device is ready to transition to the desired operating status such as “play”.
UM2999
Startup sequence
UM2999 - Rev 1 page 7/21
5Quick start guide
This chapter describes a few steps to have audio output by the amplifier using the complementary ST tools:
Extend Board MiniA2, Mini A2 board and control Graphical User Interface.
5.1 Hardware connection
• Extend board MiniA2 (if present):
– It is recommended to supply the Extend board MiniA2 through the VCC supply rail of the FDA803S
Demo SA Board. In this case R12 (0 Ω) must be inserted.
As an alternative, the Extend board can be supplied by the Mini A2 board VBAT supply. In this case
R12 must be removed.
– Connect the Extend board MiniA2 to the Mini A2 board on one side and to the FDA803S DEMO SA
board on the other, as shown in Figure 3.
– Connect the desired audio source to the Extend board MiniA2 and set the jumpers (J7, JP1-4) to select
the correct input (refer to the Extend board MiniA2 manual for details).
– Since the Extend board MiniA2 has R7 mounted by default shorting I2S_SDA1 to I2S_SDA2, remove
R7 in case the FDA903S is mounted on the board and if the I2S_SDA2 is used independently to read
the current sensing values.
• MINI A2 Board:
– Connect the USB port connector J5 (near the corner) to a PC USB port.
– In case the alternative supply concept is used of the Extend Board miniA2 (R12 not mounted), check
that the resistor R146 is present and the VBAT connector is connected to a power supply (min 5 V, max
25 V) (by default R146 is not mounted).
• FDA803S Demo SA Board:
– Connect the VCC power supply (J5) and the load (J1).
– Make sure that R13 (0 Ω) is mounted to supply the Extend board as recommended (by default R13 is
not mounted).
Attention: It is not allowed to supply the VCC power line of the FDA803S Demo SA from the MiniA2 connector (VBAT)
side.Consequently, the 3 resistors (R12, R13, R146) must not all be mounted at same time.
UM2999
Quick start guide
UM2999 - Rev 1 page 8/21
6GUI setup
• Unzip the device file (“Mini A2 FDA803S-*.zip” or “Mini A2 FDA903S-*.zip”) in the GUI installation
folder “.\AccordoGUIFDAXXX\Devices\”. It includes the amplifier’s specific registers description
(FDA803S.dev or FDA903S.dev) and if available, the configuration file (registers best settings,
FDAx03S_I2Cbest_Setting.cfg).
• Launch the GUI (rev 2.2 april 2018) with the Mini A2 board connected to the PC via USB(J5). When the
module is detected, two “LED’s” on the bottom left of the GUI panel start blinking:
– Menu “Settings” → ”serial port”: select the proper COM port;
–Menu “Settings” → ”I2C Setup”: configure the proper I2C address by clicking the button “Find Device
Address”;
Figure 4. I2C setup
– Menu “File” → ”Open Device File”: select the FDA903S.dev or FDA803S.dev file present in the
“.\AccordoGUIFDAXXX\Devices\” folder;
– Menu “File” → ” Open Reg Values File”: select the FDAx03S_I2Cbest_Setting.cfg file if present in the
“.\AccordoGUIFDAXXX\Devices\” folder.
Attention: If at any time a pop-up window appears with a “read violation“ notification, it must be ignored. Operation can
continue normally after discarding the pop-up.
UM2999
GUI setup
UM2999 - Rev 1 page 9/21
7Device setup for playback
• Turn the device on with an I2S clock present:
– Click the buttons “channel conf.” followed by “Write all“ to apply the settings loaded from the
“FDAx03S_I2Cbest_Setting.cfg” file;
– Click the “PLAY” button.
Figure 5. Channel configuration
UM2999
Device setup for playback
UM2999 - Rev 1 page 10/21
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