Migration from MC35 to MC35i
PRELIMINARY
Migration from MC35 to MC35i
16 of 30 12.03.03
4.7.2 SIM card interface
There are no changes on the integrated SIM interface with MC35 and MC35i.
4.7.3 Antenna interface
There are no changes on the RF antenna interface with MC35 and MC35i.
4.7.4 Audio interface
Both MC35 and MC35i comprise two analogue audio interfaces, each with an analogue
microphone input and an analogue loudspeaker output.
To suit several types of equipment, there are several audio modes available which can be
selected with the AT^SNFS command. The electrical characteristics of the voiceband part
vary with the audio mode. For example, sending and receiving amplification, sidetone paths,
noise suppression etc. depend on the selected mode and can be set with AT commands
(except for mode 1).
All analogue microphone inputs and loudspeaker outputs are balanced. A power supply for
electret microphones is implemented in both interfaces, too. If not needed, they have to be
decoupled with capacitors.
MC35i only: Independently of the audio mode, analogue interfaces 1 or 2 can be
selected and configured by AT commands.
Detailed instructions on using AT commands are presented in the AT Command Manual.
The specification of the audio interface signals and the voice band characteristics are
identical for MC35 and MC35i. For details refer to the Hardware Interface Description.
4.8 Electrostatic discharge
MC35 and MC35i are identically protected against electrical discharge.
4.9 Mechanical dimensions
MC35 and MC35i provide the same type of connectors and mounting holes on the
board. The position of mounting holes is identical as with MC35, as well as the order of
external connectors. The outline mechanical dimensions are identical with both devices
except the height. MC35i is a single side mounted device and is therefore thinner than
MC35.
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