NORAB100 datasheet(13/46 Pages) ETC

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NORA-B1 series - Data sheet

UBX-20027119 - R10

Interfaces

Page 13 of 46

C1 – Public

2.3.3 Location services (AoA/AoD)

NORA-B1 series supports Bluetooth Direction Finding which is part of the Bluetooth 5.2 specification.

It can be used to for example track assets, for indoor positioning and wayfinding. These phase-based

functions require antenna arrays, estimation algorithms and processing power to make it possible to

triangulate and detect the direction of a Bluetooth signal down to a sub-meter accuracy. Direction

finding is available for 1 Mbps and 2 Mbps Bluetooth LE modes.

The Angle of Arrival (AoA) receiver and Angel of Departure (AoD) transmitter use the antenna arrays,

switched on one by one, to be able to calculate the direction of a peer device. The received IQ samples

are used to determine the relative path lengths between the antenna pairs and subsequently pinpoint

the location of the transmitter.

The AoA transmitter beacon and AoD receiver peers do not require antenna arrays.

For information about additional Bluetooth location services, visit the Bluetooth SIG website [6].

2.4 System functions

2.4.1 Power modes

NORA-B1 series modules are power efficient devices capable of operating in different power saving

modes and configurations. Different sections of the module can be powered off when they are not

needed, and complex wake up events can be generated from different external and internal inputs.

The network (radio) core operates independently of the application core.

The four main power modes are:

• System ON

• System ON idle sub-modes

• System OFF – lowest power consumption

• Network Force-OFF

Depending on the application, the module should spend most of its time in either idle or System OFF

mode to minimize current consumption.

2.4.1.1 System ON

System ON is the default operation after power-on reset. You can switch on or reboot the NORA-B1

modules in one of the following ways:

• Rising edge on the VDD pin to a valid supply voltage

• Issuing a reset of the module. See also Module reset.

An event to wake up from the System OFF mode to the active mode can be triggered by:

• Programmable digital or analog sensor event. For example, a rising voltage level on an analog

comparator pin

• Detecting an NFC field

• Supplying 5 V to the VBUS pin (plugging in the USB interface)

When waking up from System ON IDLE mode to System ON mode, an event can also be triggered by:

• RTC on-board Real Time Counter

• Radio interface

• Detection of an NFC field

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