DSB75 Development Support Board Rev. B1 Hardware Description
Confidential / Released
DSB75_hd_v12 Page 39 of 96 2008-08-26
3.6.2.2 Speakerphone Operation
The speakerphones which are currently available for the audio interface 2 are the “Siemens
Car Kit Portable” and “Siemens Car Kit Portable HKP-500”.
The plug of “Siemens Car Kit portable HKP-500” is
compatible to Lumberg connector X701.
The plug of “Siemens Car Kit Portable” is compatible to
Lumberg connector X700.
The required bias voltage for the MICP2 pin of the GSM
module has to be achieved by an additional 2.2-kOhm-
resistor (see chapter
3.6.3, description of microphone
interface 2).
Figure 16: Siemens Car Kit Portable HKP-500
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