American Audio UCD-200 - REV 8-10 User Manual download pdf (Page 12)

SARA-U2 series - Data Sheet

UBX-13005287 - R05 Early Production Information Interfaces

Page 12 of 51

2.3.2 Module power-off

SARA-U2 modules can be properly switched off, with storage of current parameter settings and network detach,

in one of these ways:

 AT+CPWROFF command

 Low pulse on the PWR_ON pin for at least 1 s

An abrupt under-voltage shutdown occurs on SARA-U2 modules when the VCC supply drops below the

extended operating range minimum limit, but in this case it is not possible to perform the storing of the current

parameter settings in the module’s non-volatile memory as well as the proper network detach.

An over-temperature or an under-temperature shutdown occurs on SARA-U2 modules when the temperature

measured within the cellular 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-G3 and SARA-

U2 series System Integration Manual [7] and u-blox AT commands manual [4], +USTS AT command.

2.3.3 Module reset

SARA-U2 modules can be properly reset (rebooted), with storage of current parameter settings and network

detach, in this way:

 By the AT+CFUN command (see the u-blox AT Commands Manual [4]). This causes an “internal” or

“software” reset of the baseband processor, excluding the integrated power management unit and the RTC

internal block: the V_INT generic digital interfaces supply is enabled and each digital pin is set to its internal

reset state (reported in Table 6), the V_BCKP supply and the RTC block are enabled.

An abrupt “external” or “hardware” reset occurs when a low level is applied to the RESET_N pin, which is

normally set high by an internal pull-up, for a valid time period (see section 4.2.7). This causes a reset of the

entire module, including the integrated power management unit, except for the RTC internal block: the V_INT

generic digital interfaces supply is switched off and all the digital pins are tri-stated, but the V_BCKP supply and

the RTC block are enabled. The current parameter settings are not saved in the module’s non-volatile memory

and a proper network detach is not performed.

2.4 SIM

2.4.1 (U)SIM interface

SARA-U2 modules provide a (U)SIM interface on the VSIM, SIM_IO, SIM_CLK, SIM_RST pins: the high-speed

SIM/ME interface is implemented as well as automatic detection of the required SIM supporting voltage.

Both 1.8 V and 3 V SIM card/chip types are supported (1.8 V and 3 V ME). Activation and deactivation with

automatic voltage switch from 1.8 V to 3 V is implemented, according to ISO-IEC 7816-3 specifications. The SIM

driver supports the PPS (Protocol and Parameter Selection) procedure for baud-rate selection, according to the

values proposed by the SIM card/chip.

2.4.2 SIM card detection (SIM_DET)

The SIM_DET pin of SARA-U2 modules is a 1.8 V digital input which is by default configured as an external

interrupt to detect the SIM card presence (as a feature which can be optionally used) when it is properly

connected to the mechanical switch of the SIM card holder (for more details see SARA-G3 and SARA-U2 series

System Integration Manual [7]).

The SIM_DET pin of SARA-U2 modules can additionally be configured via AT command to provide the “SIM

card hot insertion/removal” function (for more details see u-blox AT Commands Manual [4], +UDCONF=50).

The SIM_DET pin of SARA-U2 modules can additionally be configured via AT command as GPIO (for more

details see section 2.7 and the u-blox AT Commands Manual [4], +UGPIOC, +UGPIOR, +UGPIOW).

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 50 51

Comments to this Manuals

No comments

American Audio UCD-200 - REV 8-10 User Manual Page 12

Comments to this Manuals

Related products and manuals for CD players American Audio UCD-200 - REV 8-10