Specifications

TC35 / TC37 Hardware Interface Description
TC35_37_HD_02_V03.10 - Released Page 22 of 92 21.12.2001
3.1 Operating modes
The table below briefly summarizes the various operating modes referred to in the following
chapters.
Table 2: Overview of operating modes
Mode Function
Power Down Operating voltage applied. Only a voltage regulator in the Power Supply ASIC
is active for powering the RTC. Software is not active. The RS-232 interface
is not accessible.
SLEEP Power saving mode set with AT+CFUN command.
Software is active to minimum extent. If the GSM
engine was registered to the GSM network in IDLE
mode, it is registered and paging in SLEEP mode,
too. AT interface is not responding.
IDLE Software is active. Once registered to the GSM
network, paging with BTS is carried out. The engine
is ready to send and receive.
Normal operation
TALK Connection between two subscribers is in progress.
Power consumption depends on network coverage
individual settings, such as DTX off/on, FR/EFR/HR,
hopping sequences, antenna.
Alarm mode Restricted operation launched by RTC alert function while GSM engine is in
Power Down mode. GSM engine will not be registered to GSM network.
Limited number of AT commands is accessible.
If application is battery powered: No charging functionality in Alarm mode.
Charge-only mode Limited operation for battery powered applications. Enables charging while
engine is detached from GSM network. Limited number of AT commands is
accessible. There are several ways to launch Charge-only mode:
• From Power Down mode: Connect charger to POWER lines when engine
was powered down by AT^SMSO.
• From Normal mode: Connect charger to POWER lines, then enter
AT^SMSO.
Charge mode during
normal operation
Normal operation (SLEEP, IDLE, TALK, DATA) and charging running in
parallel. Charge mode changes to Charge-only mode when GSM engine is
powered down before charging has been completed.
See also Table 7 and Table 10 for the various options of waking up the GSM engine and
proceeding from one mode to another.