Siemens TC35i Migration Guide

TC35i: Migration from TC35 to TC35i
PRELIMINARY
TC35_TC35i_MIG_01_V01.01 29.1.2003 Page 13 of 34
4.4.2 Power up / down scenarios
TC35 and TC35i are fully identical regarding the power up/down scenario with the following
exception:
To actually turn off the TC35i, the emergency shutdown line has to be driven to ground for ≥
3.2s. The TC35 emergency shutdown line needs to be driven to ground for ≥ 3.5s
For further information please consult the HW manual for TC35 and TC35i.
4.4.3 Automatic shutdown
To ensure proper operation of all assemblies under varying conditions, such as temperature,
input voltage, transmission power etc., TC35 and TC35i features protection elements for
automatic shutdown.
Automatic shutdown takes effect if:
• the TC35/TC35i board is exceeding the critical limits of overtemperature or
undertemperature
• the battery is exceeding the critical limits of overtemperature or undertemperature in a
battery application, undervoltage is detected
• overvoltage is detected.
4.4.3.1 Temperature dependent shutdown
The board temperature is constantly monitored by an internal NTC resistor located on the
PCB. The NTC that detects the battery temperature must be part of the battery pack circuit as
described in the manual. The values detected by NTC resistor are measured directly on the
board and the battery and are therefore, not fully identical with the ambient temperature.
Table 4-5: Maximum ratings and the associated URCs
Sending temperature alert
TC35 TC35i
^SCTM_A: 1 Caution: T
amb
of battery between +56°C and +60°C.
^SCTM_B: 1 Caution: T
amb
of board between +55°C and +75°C. Caution: T
amb
of board between +65°C and
+75°C.
^SCTM_A: -1 Caution: T
amb
of battery between -14°C and -18°C.
^SCTM_B: -1 Caution: T
amb
of board between –20°C and –25°C. Caution: T
amb
of board between –25°C and –
29°C.
^SCTM_A: 0 Battery back to uncritical temperature range
^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. TC35 switches off
immediately.
^SCTM_B: 2 Alert: T
amb
of board >70°C. TC35 switches off
immediately.
Alert: T
amb
of board >75°C. TC35i switches off
immediately.
^SCTM_A: -2 Alert: T
amb
of battery < -18°C. TC35 switches off
immediately

Siemens TC35i Specifications

General

Brand	Siemens
Model	TC35i
Category	Modem
Language	English