Siemens ET7 Series Spécifications Page 37

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DSB75 Development Support Board Rev. B1 Hardware Description
Strictly confidential / Released
s
DSB75_hd_v08 Page 37 of 94 29.09.2005
3.6.2.2 Speakerphone Operation
The recommended speakerphones which are currently available for the audio interface 2 are
the “Siemens Car Kit Portable” and “Siemens Car Kit Portable HKP-500” (ordering number is
L36880-N5601-A109).
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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