TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R07
Advance Information
System description
Page 38 of 158
1.7.2
Antenna detection interface (ANT_DET)
Antenna detection (
ANT_DET
) is not available on MPCI-L2 series modules.
Antenna detection (
ANT_DET
) is not supported by TOBY-L2 “00”, “01”, and “50” product versions.
The antenna detection is based on ADC measurement. The
ANT_DET
pin is an Analog to Digital Converter
(ADC) provided to sense the antenna presence.
The antenna detection function provided by
ANT_DET
pin is an optional feature that can be implemented if the
application requires it. The antenna detection is forced by the +UANTR AT command. See the
u-blox AT
Commands Manual
[3] for more details on this feature.
The
ANT_DET
pin generates a DC current (for detailed characteristics see the
TOBY-L2 series Data Sheet
[1]) and
measures the resulting DC voltage, thus determining the resistance from the antenna connector provided on the
application board to GND. So, the requirements to achieve antenna detection functionality are the following:
an RF antenna assembly with a built-in resistor (diagnostic circuit) must be used
an antenna detection circuit must be implemented on the application board
See section 2.4.2 for antenna detection circuit on application board and diagnostic circuit on antenna assembly
design-in guidelines.
1.8
SIM interface
1.8.1
SIM interface
TOBY-L2 and MPCI-L2 series modules provide high-speed SIM/ME interface including automatic detection and
configuration of the voltage required by the connected SIM card or chip.
Both 1.8 V and 3 V SIM types are supported. Activation and deactivation with automatic voltage switch from
1.8 V to 3 V are implemented, according to ISO-IEC 7816-3 specifications. The
VSIM
or
UIM_PWR
supply
output provides internal short circuit protection to limit start-up current and protect the SIM to short circuits.
The SIM driver supports the PPS (Protocol and Parameter Selection) procedure for baud-rate selection, according
to the values determined by the SIM card or chip.
1.8.2
SIM detection interface
SIM detection (
GPIO5
) is not available on MPCI-L2 series modules.
SIM detection (
GPIO5
) is not supported by TOBY-L2 “00”, “01”, and “50” product versions.
The
GPIO5
pin is by default configured to detect the SIM card mechanical / physical presence. The pin is
configured as input with an internal active pull-down enabled, and it can sense SIM card presence only if
properly connected to the mechanical switch of a SIM card holder as described in section 2.5:
Low logic level at
GPIO5
input pin is recognized as SIM card not present
High logic level at
GPIO5
input pin is recognized as SIM card present
The SIM card detection function provided by
GPIO5
pin is an optional feature that can be implemented / used or
not according to the application requirements: an Unsolicited Result Code (URC) is generated each time that
there is a change of status (for more details see the
u-blox AT Commands Manual
The optional function “SIM card hot insertion/removal” can be additionally enabled on the
GPIO5
pin by specific
AT command (see the
u-blox AT Commands Manual
