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TWR-AUDIO-DA7321 User Manual Rev0.3 - June 2013 4

TWR-AUDIO-DA7321 USER MANUAL

The pull-up resistors required for correct operation of the I2C interface are situated on the Tower

processor module. Optional pull-ups (R14 and R17) are also available on the TWR-AUDIO-DA7321

module. These can be brought into circuit by shorting the R15 and R16 sites.

2.5 I/O Connectors

2.5.1 AUX_IN

Analogue signals are applied to the auxiliary inputs AUX1_L/R via a 3.5mm jack socket J8.

The DA7321 analogue inputs are DC biased so a series DC blocking capacitor is added to the input

path.

2.5.2 EXT_MIC

An external microphone can be attached to the board via jack socket J3.

The external microphone signal is routed to the DA7321 MIC1_P via J4. The DC bias is sourced from

MICBIAS1.

Jumper Functionality Setting Description

Microphone Signal Select 1-2

2-3

Headset Microphone (J7)

External Microphone (J3)

Table 3 J4 Microphone Signal Select

2.5.3 HEADSET

A standard headset (headphones + microphone) can be attached to the TWR-AUDIO-DA7321 via a

3.5mm, 4-pole socket J7.

There are multiple examples of pole allocation depending on headset manufacturer. J5 and J6 can be

used to route the MIC and GND signals for the two most common implementations. Headphone Left

and Right remain fixed.

The headphone microphone signal is routed to the DA7321 MIC1_P input via J4 as detailed in Table

3. The DC bias is sourced from MICBIAS1.

Figure 1 Headset Jack Configuration Options

Jumper Functionality Setting Description

J5 & J6

Headset jack signal select 1-2

1-1 & 2-2

See Figure 1

1=GND, 2=MIC, 3=HPR, 4=HPL

1=MIC, 2=GND, 3=HPR, 4=HPL

Table 4 J5 and J6 Headset Jack Configuration Options

1 2 3 4 5 6 7 8 9 10 ... 14 15

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Silicon Laboratories SI5351A/B/C Bedienungsanleitung Seite 5