ST FDA803S, Руководство пользователя, Страница: 6 / 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 I
2
C control and I
2
S (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 I
2
C 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 I
2
C 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 I
2
C inside the read registers DB8 and DB9,
whereas setting IB2[2] to ‘1’, the real time information is available via I
2
S bus through the I2S_SDA2 data line.
UM2999
Board options
UM2999 - Rev 1
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