SARA-R5 datasheet(13/43 Pages) U-BLOX

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SARA-R5 series - Data sheet

UBX-19016638 - R06

Interfaces

Page 13 of 43

C1-Public

2.3 System functions

2.3.1

Module power-on

When the SARA-R500S and SARA-R510M8S modules are not powered, they can be switched on as

following:



Applying a voltage at the VCC module supply input within the operating range (see Table 9)

When the SARA-R510S modules are not powered, they can be switched on as following:



Applying a voltage at the VCC module supply input within the operating range (see Table 9), and

then forcing a low level at the PWR_ON input pin, which is normally set high by an internal pull-up,

for a valid time period (see section 4.2.6, module switch on).

When the SARA-R5 series modules are in power-off mode (i.e. switched off, but with a valid voltage

present at the VCC module supply input within the operating range reported in Table 9), they can be

switched on as following:



Forcing a low level at the PWR_ON input pin, which is normally set high by an internal pull-up, for

a valid time period (see section 4.2.6, module switch on).

When the SARA-R5 series modules are in low power PSM deep-sleep mode, with a valid voltage

present at the VCC module supply input within the operating range reported in Table 9, they can be

woken up as following:



Forcing a low level at the PWR_ON input pin, which is normally set high by an internal pull-up, for

a valid time period (see section 4.2.6, module wake-up from PSM deep-sleep).

The PWR_ON line is intended to be driven by open drain, open collector or contact switch.

☞ It is recommended to provide accessible test point directly connected to the PWR_ON input pin.

2.3.2 Module power-off

SARA-R5 series can be properly switched off, saving current parameter settings in the module’s

non-volatile memory and performing a proper network detach, by:



AT+CPWROFF command (see the SARA-R5 series AT commands manual [1])



Forcing a low pulse at the PWR_ON input pin, for a valid time period (see section 4.2.6, module

normal graceful switch-off)

A fast emergency shutdown procedure of the modules, without storage of the current parameter

settings in the module’s non-volatile memory and without proper network detach, can be triggered by



Toggling the GPIO input pin configured with fast emergency shutdown function (see section 2.7,

module fast emergency shutdown)

An abrupt under-voltage shutdown occurs on SARA-R5 series modules when the VCC supply is

removed. If this occurs, it is not possible to store the current parameter settings in the module’s

non-volatile memory or to perform the proper network detach.

An over-temperature or an under-temperature shutdown occurs on the SARA-R5 series modules

when the temperature measured within the module reaches the dangerous area, if the optional Smart

Temperature Supervisor feature is enabled and configured by the dedicated AT command. For more

details, see the SARA-R5 series system integration manual [2] and the SARA-R5 series AT commands

manual [1].

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