User's Manual
Table Of Contents
- Document History
- Introduction
- Product Concept
- Application Interface
- Operating Modes
- Power Supply
- Power Up / Power Down Scenarios
- Automatic GPRS Multislot Class Change
- Charging Control
- Summary of State Transitions (Except SLEEP Mode)
- RTC Backup
- SIM Interface
- Serial Interface ASC0
- Serial Interface ASC1
- USB Interface
- I2C Interface
- Audio Interfaces
- Control Signals
- Antenna Interface
- Electrical, Reliability and Radio Characteristics
- Mechanics
- Sample Application
- Reference Approval
- Appendix
TC63 Hardware Interface Description
Strictly confidential / Draft
s
TC63_HD_V00.432 Page 56 of 97 11.05.2005
3.13.3 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. See examples in Figure
21 and Figure 22.
GSM module
AGND
EPNx
EPPx
Figure 21: Differential loudspeaker configuration
Loudspeaker impedance
EPP1/EPN1
Z
L
= typ. 8Ohm
EPP2/EPN2
Z
L
= typ. 32Ohm
GSM module
AGND
EPNx
EPPx
+
C
k
Figure 22: Single ended loudspeaker configuration
Loudspeaker impedance
EPP1/EPN1
Z
L
= typ. 8Ohm
C
k
= 220µF
EPP2/EPN2
Z
L
= typ. 32Ohm
C
k
= 47µF