Siemens ET7 Series Spezifikationen PDF herunterladen (Seite 36)

DSB75 Development Support Board Rev. B1 Hardware Description

Strictly confidential / Released

DSB75_hd_v08 Page 36 of 94 29.09.2005

3.6.2 Audio Interface 2 (Headset or Speakerphone Operation)

The unbalanced audio interface 2 is designed for use with headsets or speakerphones. The

interface is available on the 12-pin Lumberg connectors X700 and X701. The pin assignment

of the Lumberg jacks is shown in Table 13. The power for the microphone (VMIC) is supplied

by the GSM module. EPREF may be used for single ended loudspeaker configurations

saving an additional coupling capacitor.

Table 13: Pin assignment of audio interface 2 (X700, X701)

Signal name X700 pin X701 pin I/O Description

GND 1 2 - Ground

Not relevant for audio.

R 2 - 4.7k resistor to pin 3, necessary

for old charger types.

Not relevant for audio

Charge

3 1 I Supply voltage provided by the

plug-in charger.

Not relevant for audio

n.c. 4, 6, 7, 8 3, 4, 6, 7 - Not connected.

Not relevant for audio

EPREF - 9 - 100µF capacitor to AGND.

AC coupled loudspeaker ground

GND 5 5 - 5kOhm to GND.

AGND 9 11 - Microphone and stereo

loudspeaker ground

MICP 10 12 I Microphone not inverted.

EPP 11 10 O Loudspeaker not inverted.

EPN 12 8 O Loudspeaker inverted.

3.6.2.1 Recommended Headset

A standard headset interface for mobile applications offered by Siemens is, for example, the

PTT headset, ordering number L36880-N4001-A123 or Headset PTT HHS-510.

Please note that the headset interface has no detections for a device plug or Push-To-Talk

key (PTT).

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