User's Manual

GSM/GPRS/GNSS Module Series
MC20 Hardware Design
MC20_Hardware_Design Confidential / Released 57 / 95
3.7.6. Audio Characteristics
Table 17: Typical Electret Microphone Characteristics
Table 18: Typical Speaker Characteristics
3.8. SIM Card Interface
The SIM interface supports the functionality of the GSM Phase 1 specification and also the functionality of
the new GSM Phase 2+ specification for FAST 64 kbps SIM card (intended for use with a SIM application
tool-kit.
The SIM interface is powered by an internal regulator in the module. Both 1.8V and 3.0V SIM cards are
supported, and Dual SIM Single Standby function is supported.
Parameter Min. Typ. Max. Unit
Working Voltage 1.2 1.5 2.0 V
Working Current 200 500 uA
External Microphone Load Resistance 2.2 K Ohm
Parameter Min. Typ. Max. Unit
AOUT1
Output
Single-ended
Load resistance 32 Ohm
Reference level 0 2.4 Vpp
Differential
Load resistance 32 Ohm
Reference level 0 4.8 Vpp
AOUT2
Output
Differential
Load resistance 8 Ohm
Reference level 0 2×VBAT Vpp
Single-ended
Load resistance 8 Ohm
Reference level 0 VBAT Vpp