Specifications

Cinterion
®
ALAS5V Hardware Interface Description
4.2 Power Up/Power Down Scenarios
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ALAS5V_HID_v00.030a 2019-03-20
Confidential / Preliminary
Page 79 of 124
4.2.4.1 Thermal Shutdown
The board temperature is constantly monitored by an internal NTC resistor located on the PCB.
The values detected by the NTC resistor are measured directly on the board and therefore, are
not fully identical with the ambient temperature.
Each time the board temperature goes out of range or back to normal, ALAS5V instantly dis-
plays an alert (if enabled).
• URCs indicating the level "1" or "-1" allow the user to take appropriate precautions, such as
protecting the module from exposure to extreme conditions. The presentation of the URCs
depends on settings selected with the AT^SCTM write command.
AT^SCTM=1: Presentation of URCs is always enabled.
AT^SCTM=0 (default): Presentation of URCs is enabled during the 2 minutes guard period
after start-up of ALAS5V. After expiry of the 2 minutes guard period, the presentation will
be disabled, i.e. no URCs with alert levels "1" or ''-1" will be generated.
• URCs indicating the level "2" and ”-2” are instantly followed by an orderly shutdown, except
for cases described in Section 4.2.4.2. The presentation of these URCs is always enabled,
i.e. they will be output even though the factory setting AT^SCTM=0 was never changed.
The (maximum) temperature ratings are stated in Section 4.5. Temperature limits and associ-
ated URCs are listed in the below Table 23.
The AT^SCTM command can also be used to check the present status of the board. Depending
on the selected mode, the read command returns the current board temperature in degrees
Celsius or only a value that indicates whether the board is within the safe or critical temperature
range. See [1] for further instructions.
Table 23: Board temperature warning and switch off level
Parameter Temperature URC Notes
High temperature switch off active > +97°C ^SCTM_B: 2 The possible deviation is typi-
cally ± 2°C.
High temperature switch off release <
+96°C ^SCTM_B: 1
High temperature warning active >
+86°C ^SCTM_B: 1
High temperature warning release <
+85°C ^SCTM_B: 0
Operating temperature range -30°C...+85°C ---
Low temperature warning release >
-30°C ^SCTM_B: 0 The possible deviation is typi-
cally ± 2°C.
Low temperature warning active <
-31°C ^SCTM_B: -1
Low temperature switch off release >
-40°C ^SCTM_B: -1
Low temperature switch off active <
-42°C ^SCTM_B: -2