NXP Semiconductors UM10340-5 User Manual

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NXP Semiconductors UM10340-5 User Manual Manual pdf 5 page image

NXP Semiconductors UM10340_5TFA9879 demonstration PCB© NXP B.V. 2011. All rights reserved.User manual Rev. 05 — 30 aug. 2011 5 of 202. Setup demonstration PCB2.1 Hardware setupFigure 2 is showing the hardware setup of the TFA9879 mono demonstration PCB withscrew terminals for connecting the power supply (X3) and the speaker cables (X7).The speaker can be driven by the Class-D amplifier with:• A digital audio signal via the headers X4 (I2S input 1) or X5 (I2S input 2);• An analog stereo audio signal via the RCA Jacks X14 and X11 (I2S input 2).Remark: Default the ADC is connected to the I2S input 2 of the TFA9879 via R35, R36and R37 (10R, see schematic in paragraph 4). These 10R resistors must be removedfrom the PCB when driving I2S via X5.The USM interface (USB to I2C converter) including the 4-wire flat cable, which areprovided with the board, should be connected between demonstration PCB (connectorX9) and USM interface. The USB port should be connected to the PC.Important remark: First install the GUI software (see paragraph 2.2.1), which includes theUSB driver, before connecting the USM interface to the PC.+ OUT - Supply I2C inputRight LeftAnalog Class-D inputS3X7 X3X14 X11S2S4S1X4 X5X9DigitalClass-D inputI2S input 1I2S input 2S53Figure 2: Setup demonstration PCB Figure 3: USM interfaceTable 1. Input/output connector assignmentREF TYPE Pin Label DescriptionX3 Terminal block, screw 1 GND Ground2 VP Positive supply input (2.5V…5.5V)X4 Header, double row 1, 2, 9, 10 Not connected3 SDI1 Data input 1