Sim Card Interfaces - Quectel M85 User Manual

AOUT2
Single-ended
Output
AOUT3
Differential
Output

3.9. SIM Card Interfaces

The module contains two SIM interfaces to allow module access the two SIM cards. Only one SIM card
can work at a time. Both of two SIM interfaces share the ground and only first SIM interface have card
insert detection.
In dual SIM card mode, configure AT+QDSIM=0 to use the SIM1 interface and configure AT+QDSIM=1 to
use SIM2 interface. For more details, please refer to the document [1].
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 by an internal regulator in the module. Both 1.8V and 3.0V SIM Cards are
supported.
Table 12: Pin Definition of the SIM Interface
Pin Name
SIM1_VDD
SIM2_VDD
SIM1_CLK
SIM2_CLK
SIM1_DATA
SIM2_DATA
SIM1_RST
SIM2_RST
M85_Hardware_Design
Load resistance
Ref level
Load resistance
Ref level
Pin No. Description
Supply power for SIM card. Automatic detection of SIM
56
card voltage. 3.0V± 10% and 1.8V± 10%. Maximum
71
supply current is around 10mA.
55
SIM card clock
72
54
SIM card data I/O
73
53
SIM card reset
74
Confidential / Released
GSM/GPRS Module Series
32
0
8
0
M85 Hardware Design
Ohm
2.4 Vpp
Ohm
2×VBAT Vpp
50 / 88