
TC65 Hardware Interface Description
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TC65_HD_V02.000 Page 68 of 120 08.06.2006
3.15.3 Loudspeaker Circuit
The GSM module comprises two analog speaker outputs: EP1 and EP2. Output EP1 is able
to drive a load of 8Ohms while the output EP2 can drive a load of 32Ohms. Each interface
can be connected in differential and in single ended configuration.
Figure 27 shows an
example for a differential loudspeaker configuration.
GSM module
AGND
EPNx
EPPx
Figure 27: Differential loudspeaker configuration
Loudspeaker impedance
EPP1/EPN1
Z
L
= typ. 8Ohm
EPP2/EPN2
Z
L
= typ. 32Ohm
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