ST 6100 - HARDWARE GUIDE
3.3.2 Power Consumption
Typical power consumption values at VIN=12 V and at room temperature (23°C)
Table 5: Power Consumption
State of Operation Current
Transmit 652 mA
Satellite communications receive 59 mA
Sleep 100 µA
Current
GNSS Power Consumption 22 mA
Peripheral Current
LED 7.2 mA
3.3.2.1 Average Power Consumption
The satellite receive current is specified at 59 mA. At times, the receiver might continuously be on when the terminal
is searching for a satellite signal, receiving network updates or waiting for acknowledgment responses. However, in
normal operation the receiver is not on continuously, instead it wakes up once every five (5) seconds to receive,
which results in an average 7.6 mA consumption, at 12 V (152 mAh/day).
In low power mode, the average terminal power consumption is decreased further depending on the wake-up period
that extends the modem wake-up period from a default five (5) seconds. The overall power consumption depends on
many factors including how often the modem wakes to receive to-mobile messages, how often GPS fixes are
requested, the size and frequency of mobile messages and LED settings. Refer to [T204] for additional details on low
power operation.
3.3.2.2 Blockage Power
If a terminal is blocked so that it cannot receive the satellite signals, it must scan to reacquire the traffic channels.
While scanning for traffic channels, the terminal consumes more power than when it has acquired a traffic channel.
For powered applications, the terminal continually scans for a satellite so that it can reacquire quickly when blockage
is removed. Refer to [N200] for additional details on network blockage behavior.
The table below shows the terminal configured for MobileMinBattery power profile and with 3 minute and 1 minute
GPS fix timeouts. The GPS fix time is a modem register that limits the amount of time the terminal waits for a GPS fix.
A long GPS fix time as per the 3 minute default allows time for the GPS to acquire in a partially blocked location.
However, GPS consumes considerable power and shortening the acquisition time saves power if terminal is blocked
and will never acquire GPS. The GPS Fix time can be restricted by two properties maxFixTimeout (PIN 20) and
acquireTimeout (PIN 19) in the Position service (SIN 20). maxFixTimeout defines the timeout for any fix while
acquireTimeout defines the timeout for the GPS to see at least one satellite.
T406, VERSION 01
16
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