xN930 M.2 Hardware User Guide
3.2
(U)SIM Interface
An external SIM Card socket is assumed to be mounted on the system board. The
M.2 module will access the SIM card through its USIM interface.
The USIM interface is compatible with the ISO 7816-3 IC Card standard on the issues
required by the GSM 11.12 and GSM 11.18 standard.
Both 1.8 V and 3 V SIM Cards are supported.
A few comments on the SIM_DETECT signal
1.
An external pull-up resistor is not needed on SIM_DETECT. An internal pull-up
resistor on X-GOLD™ baseband IC will be used.
2.
When a SIM is inserted, SIM_DETECT will be high.
3.
When a SIM is removed or not present, SIM_DETECT will be low.
4.
The host does not need to drive this signal. It can be tri-stated.
Table 6 (U)SIM Interface Signals
Signal Name
Description
Pin
Direction
(WWAN)
Voltage
Level
UIM_CLK
Clock SIM Card
32
O
1.8 V/2.9
V
UIM_DATA
Input/ Output SIM Card
34
I, O
1.8 V/2.9
V
UIM_RESET
Reset signal for SIM card
30
O
1.8 V/2.9
V
USIM_PWR
1.8 V/3 V Supply for SIM Card
36
O
1.8 V/2.9
V
SIM Detect
SIM Card Detection
66
I
1.8 V
3.3
GNSS Interface
Some M.2 modules incorporate GPS and GLONASS receivers with aGPS to support
Global Positioning.
For M.2 modules that feature GNSS support, see
Table 1, the M.2 module incorporates the
CG1960 Single-Chip GNSS Device, which is a complete receiver for simultaneous reception
and processing of both GPS and GLONASS signals. It includes LNA, mixer, bandpass filter,
VCO, ALC, fractional-N frequency synthesizer, digital tunable filters, PGA stage, and multi-
bit ADCs. A UART interface is used by the
X-GOLD™ Communications Processor on the M.2 module to control the GNSS device. The
solution offers best-in-class acquisition and tracking sensitivity, TFF and accuracy.
The GNSS device supports several different power management modes which gives the
lowest possible energy usage per fix. The pre-calculated location data will be sent over the
USB host interface. In addition, the M.2 will produce GPS data when the system is in sleep
mode via an I2C interface to allow for applications to be available in low power modes.
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