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GNSS HDOP, GSM CellID, GSM Area Code, Active GSM Operator and ICCID. TMT250 can enter
deep sleep mode if ALL of these conditions are met:
▪ TMT250 is configured in Deep Sleep mode and sleep timeout is reached;
▪ Device time is synchronized with GNSS satellites and GPS fix is obtained;
▪ Movement is not detected by the accelerometer;
▪ Min. Record Saving Period (Data Acquisition Mode settings) must be larger than Open
Link Timeout parameter, so that TMT250 could close GPRS link;
▪ The difference between Send Period (Data Acquisition Mode settings) and Open Link
Timeout must be more than 90 seconds, so that TMT250 could close GPRS link within at
least 90 seconds;
▪ Forced wakeup is not set;
▪ There are no SMS messages being received;
▪ Data socket(s) are closed;
▪ Data sending is not in progress;
▪ FOTA is not in progress.
TMT250 exits deep sleep mode if following condition is true:
• Movement by accelerometer is detected;
4.2.3 Online Deep Sleep mode
In this mode the device works as in deep sleep mode, but without deregistering from GSM
network. GSM part stays powered so this increases power consumption. In this mode device
should send/receive SMS and make/accept calls. It does not close GPRS context if one was
previously opened. Conditions to enter online deep sleep mode are the same as entering deep
sleep mode. TMT250 exits online sleep mode if following condition is true. TMT250 exits online
sleep mode if following condition is true:
▪ Movement by accelerometer is detected;
4.2.4 Ultra Deep Sleep mode
Conditions to enter ultra deep sleep mode, where GPS and GSM modem are turned off and
device functions are suspended for maximum battery saving, are the same as entering Deep
Sleep mode.
TMT250 exits ultra deep sleep mode only when movement is detected by accelerometer.
Movement source is not taken into account in this case.
4.3
Features
Using available features can greatly increase TMT250 utilization.
4.3.1 Alarm
Alarm is a function that can be only triggered by a button (Power Button or Alarm Button).
When the alarm is triggered, an event with IO ID 236 is generated. Following from that an SMS
be sent and a call can be performed.
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