Ublox SARA-N2 Series, System Integration Manual

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SARA-N2 / N3 series - System integration manual
UBX-17005143 - R13 System description Page 9 of 95
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The RF section is composed of the following main elements:
• LTE power amplifier, which amplifies the signals modulated by the RF transceiver
•
RF switches, which connect the antenna input/output pin ( ANT ) of the module to the suitable
RX/TX path
• RX low-loss filters
• 38.4 MHz (SARA-N2 series) / 26.0 MHz (SARA-N3 series) crystal oscillator for the clock reference
in active-mode and connected-mode
The Baseband and Power Management section is composed of the following main elements:
• Baseband processor
• Flash memory
• Voltage regulators to derive all the system supply voltages from the module supply VCC
•
Circuit for the RTC clock reference in low power deep-sleep
1.3 Pin-out
Table 3 lists the pin-out of the SARA-N2 / N3 series modules, with pins grouped by function
Function Pin name Modules Pin No I/O Description Remarks
Power VCC All 51,52,53 I Module supply
input All VCC pins must be connected to external supply.
VCC supply circuit affects the RF performance and
compliance of the device integrating the module with
applicable required certification schemes.
See section
1.5.1 for description and requirements.
See section 2.2.1 for external circuit design-in.
GND All 1,3,5,14,
20,22,30,
32,43,50,
54,55,57,
58,60,61,
63-96 N/A Ground All GND pins have to be connected to external ground.
External ground connection affects the RF and thermal
performance of the device.
See section
2.2.1.8 for external circuit design-in.
GND SARA-N2 21,59 N/A Ground All GND pins have to be connected to external ground.
External ground connection affects the RF and thermal
performance of the device.
See section
2.2.1.8 for external circuit design-in.
V_BCKP SARA-N3 2 I/O RTC supply
input/output
See section 1.5.2 for functional description.
See section 2.2.2 for external circuit design-in.
V_INT All 4 O
Generic Digital
Interfaces supply
output
SARA-N2 series modules:
• Supply output generated by internal linear LDO
regulator when the radio is on
• Voltage domain of I2C and GPIOs
• V_INT = 1.8 V (typical)
SARA-N3 series modules:
• Supply output generated by internal linear LDO
regulator when the module is on
• Voltage domain of UARTs, I2C and GPIOs
• V_INT = 1.8 V (typ.), if VSEL is connected to GND
• V_INT = 2.8 V (typ.), if VSEL is unconnected
Provide a test point on this pin for diagnostic purpose.
See section
1.5.3 for functional description.
See section 2.2.3 for external circuit design-in.