EGS5 Hardware Interface Description
3.3 Power Up / Power Down Scenarios
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EGS5_HD_v02.004
Page 39 of 123
2012-02-09
Confidential / Released
3.3.4.2
Deferred Shutdown at Extreme Temperature Conditions
In the following cases, automatic shutdown will be deferred if a critical temperature limit is ex-
ceeded:
•
While an emergency call is in progress.
•
During a two minute guard period after power-up. This guard period has been introduced in
order to allow for the user to make an emergency call. The start of emergency call extends
the guard period until the end of the call. Any other network activity may be terminated by
shutdown upon expiry of the guard time. The guard period starts again when the module
registers to the GSM network the first time after power-up.
If the temperature is still out of range after the guard period expires or the call ends, the module
switches off immediately (without another alert message).
CAUTION! Automatic shutdown is a safety feature intended to prevent damage to the module.
Extended usage of the deferred shutdown functionality may result in damage to the module,
and possibly other severe consequences.
Table 9:
Temperature dependent behavior
Sending temperature alert (15s after EGS5 start-up, otherwise only if URC presentation enabled)
^SCTM_A: 1
Caution: Battery close to overtemperature limit.
^SCTM_B: 1
Caution: Board close to overtemperature limit, i.e., board is 5°C below overtem-
perature limit.
^SCTM_A: -1
Caution: Battery close to undertemperature limit.
^SCTM_B: -1
Caution: Board close to undertemperature limit, i.e., board is 5°C above under-
temperature limit.
^SCTM_A: 0
Battery back to uncritical temperature range.
^SCTM_B: 0
Board back to uncritical temperature range, i.e., board is 6°C below its over- or
above its undertemperature limit.
Automatic shutdown (URC appears no matter whether or not presentation was enabled)
^SCTM_A: 2
Alert: Battery equal or beyond overtemperature limit. EGS5 switches off.
^SCTM_B: 2
Alert: Board equal or beyond overtemperature limit. EGS5 switches off.
^SCTM_A: -2
Alert: Battery equal or below undertemperature limit. EGS5 switches off.
^SCTM_B: -2
Alert: Board equal or below undertemperature limit. EGS5 switches off.
