Specifications

Migration from MC35 to MC35i
RELEASED
MC35_MC35i_MIG_V01.03 Page 17 of 33 23.04.03
3.4.3 Automatic shutdown
To ensure proper operation of all assemblies under varying conditions, such as temperature,
input voltage, transmission power etc., MC35 and MC35i features protection elements for
automatic shutdown.
Automatic shutdown takes effect if:
· the MC35/MC35i board is exceeding the critical limits of overtemperature or
undertemperature
· the battery is exceeding the critical limits of overtemperature or undertemperature
(MC35 only)
· undervoltage is detected
3.4.3.1 Temperature dependent shutdown
The board temperature is constantly monitored by an internal NTC resistor located on the
PCB. The values detected by NTC resistor are measured directly on the board and are
therefore not fully identical with the ambient temperature.
Table 9: Maximum ratings and the associated URCs
Sending temperature alert (15 s after start-up, otherwise only if URC presentation enabled)
MC35 MC35i
^SCTM_A: 1 Caution: T
amb
of battery between +56°C and +60°C. Not applicable
^SCTM_B: 1 Caution: T
amb
of board between +65°C and +70°C. Caution: T
amb
of board close to overtemperature
limit.
^SCTM_A: -1 Caution: T
amb
of battery between -14°C and –18°C. Not applicable
^SCTM_B: -1 Caution: T
amb
of board between –26°C and –29°C. Caution: T
amb
of board close to undertemperature
limit.
^SCTM_A: 0 Battery back to uncritical temperature range Not applicable
^SCTM_B: 0 Board back to uncritical temperature range.
Automatic shutdown (URC appears no matter whether or not presentation was enabled)
^SCTM_A: 2 Alert: T
amb
of battery >60°C. MC35 switches off
immediately.
Not applicable
^SCTM_B: 2 Alert: T
amb
of board >70°C. MC35 switches off
immediately.
Alert: T
amb
of board >70°C. MC35i switches off
immediately.
1)
^SCTM_A: -2 Alert: T
amb
of battery < -18°C. MC35 switches off
immediately
Not applicable
^SCTM_B: -2 Alert: T
amb
of board <-29°C. MC35 switches off
immediately.
Alert: T
amb
of board <-25°C. MC35i switches off
immediately.
1)
1)
Due to temperature measurement uncertainty, a tolerance of ± 3°C on the switching
thresholds may occur.
3.4.3.2 Battery pack
MC35i has no charging management for external batteries.
3.5 RTC backup
MC35 and MC35i are fully identical regarding the internal Real Time Clock.