SARA-R412M datasheet(11/43 Pages) U-BLOX

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SARA-R4 series - Data sheet

UBX-16024152 - R18

Interfaces

Page 11 of 43

2 Interfaces

2.1 Power management

2.1.1

Module supply input (VCC)

SARA-R4 series modules must be supplied through the VCC pins by a DC power supply. Voltage must

be stable, because during operation the current drawn from VCC may vary significantly, based on the

power consumption profile of the LTE Cat M1, LTE Cat NB1 and the 2G radio access technologies

(described in the SARA-R4 series system integration manual [2]).

SARA-R412M modules provide separate supply inputs over the three VCC pins:



VCC pins #52 and #53 represent the supply input for the internal RF Power Amplifier, demanding

most of the total current drawn of the module when RF transmission is enabled during a call



VCC pin #51 represents the supply input for the internal baseband Power Management Unit,

demanding minor part of the total current drawn of the module when RF transmission is enabled

during a call

The three VCC pins of SARA-R404M, SARA-R410M and SARA-N410 modules are internally connected

to both the internal Power Amplifier and the internal baseband Power Management Unit.

It is important that the system power supply circuit is able to withstand the maximum pulse current

during a transmit burst at maximum power level (see Table 12).

2.1.2 Generic digital interfaces supply output (V_INT)

SARA-R4 series modules provide a 1.8 V supply rail output on the V_INT pin, which is internally

generated when the module is switched on. The same voltage domain is used internally to supply the

generic digital interfaces of the module. The V_INT supply output can be used in place of an external

discrete regulator.

2.2 Antenna interface

2.2.1 Antenna RF interface (ANT)

The ANT pin represents the RF antenna interface of the module, with a characteristic impedance of

50 .

2.2.2 Antenna detection (ANT_DET)

The ANT_DET pin is an Analog to Digital Converter (ADC) input with a current source provided by

SARA-R4 series modules to sense the antenna presence (as an optional feature). It evaluates the

resistance from the ANT pin to GND by means of an external antenna detection circuit implemented

on the application board (for more details, see the u-blox SARA-R4 series system integration

manual [2] and the SARA-R4 series AT commands manual [1]).

2.3 System functions

2.3.1 Module power-on

SARA-R4 series can be switched on using the following procedure:



Low level on the PWR_ON pin, which is normally set high by an internal pull-up, for a valid time

period when the applied VCC voltage is within the valid operating range (see sections 4.2.3 and

4.2.8). The PWR_ON line has to be driven by open drain, open collector or contact switch.

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