NEO-M9N-Integration manual
3.11 Power management
u-blox receivers support different power modes. These modes represent strategies of how to control
the acquisition and tracking engines in order to achieve either the best possible performance or good
performance with reduced power consumption.
Receiver power management can be split into two categories:
• Externally controlled power management: This includes various modes of power management
that are directly operated by the user or host device. These modes are:
1. External cycling of the receiver main power supply
2. Instruct the receiver to turn on/off via the UBX-RXM-PMREQ message
3. Instruct the receiver to turn on/off via external pins (EXTINT0 or EXTINT1)
• Internally controlled power management: Here the receiver makes the decision when to power
down/up some/all of its internal components according to predefined parameters. It is also
referred to as power save mode (PSM). In PSM one of two modes of operations can be selected:
1. On/off operation (PSMOO)
2. Cyclic tracking (PSMCT)
Continuous operation Cyclic operation On/off operation
Main use Continuous position tracking Low-power continuous
position tracking
Occasional position tracking
Possible applications Navigation applications Tracking devices with battery Tracking devices which only
need a position fix every few
minutes or less
Table 19: Different power management modes
The following figure illustrates u-blox power management modes.
Figure 17: u-blox power management
The majority of the power management section explains the power save mode (internally
controlled power management). However, some concepts relevant to the externally controlled power
management are also explained, such as the EXTINT control, Wake up and Power on/off command.
UBX-19014286 - R07
3 Receiver functionality Page 42 of 95
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