Sim Card Interface; Sim Card Application - Quectel M12 Hardware Design

M12 Hardware Design
Table 12: Typical speaker characteristic
Parameter
Normal Single
Output(SPK1) Ended
Differential
Auxiliary Single
Output(SPK2) Ended
Maxim driving
current limit of
SPK1 and SPK2

3.10. SIM card interface

3.10.1. SIM card application

The SIM interface supports the functionality of the GSM Phase 1 specification and also supports
the functionality of the new GSM Phase 2+ specification for FAST 64 kbps SIM card, which is
intended for use with a SIM application Tool-kit
The SIM interface is powered from an internal regulator in the module. Both 1.8V and 3.0V SIM
Cards are supported.
Table 13: Pin definition of the SIM interface
Name Pin
SIM_VDD 12
SIM_DATA 13
SIM_CLK 14
SIM_RST 15
SIM_PRESENCE 11
Figure 33 is the reference circuit for SIM interface, and here an 8-pin SIM card holder is used.
The pin SIM_PRESENCE is used to detect whether the tray of the Molex SIM socket, which is
used for holding SIM card, is present in the card socket. When the tray is inserted in the socket,
SIM_PRESENCE is at low level. Regardless of the SIM card is in the tray or not, the change of
SIM_PRESENCE level from high to low level prompts the module to reinitialize SIM card. In
M12_Hardware_Design_V3.3
Min
Load resistance 28
Ref level 0
Load resistance 28
Ref level 0
Load resistance 16
Ref level 0
Function
Supply power for SIM Card. Automatic detection of
SIM card voltage.
Maximum supply current is around 10mA.
SIM Card data I/O
SIM Card Clock
SIM Card Reset
SIM Card Presence
Typ Max
32
2.4
32
4.8
32
2.4
50
3.0V± 10% and 1.8V± 10%.
Unit
Ohm
Vpp
Ohm
Vpp
Ohm
Vpp
mA
- 50 -