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1.10.5 Pulse width modulation (PWM) interface
NORA-B1 supports up to four PWM instances, each with four channels. All four instances are available
through the application core. The PWM module enables the generation of pulse width modulated
signals on GPIO. The module implements an up or up-and-down counter with four PWM channels that
drive assigned GPIOs.
1.10.6 Inter-IC Sound (I2S) Interface
NORA-B1 supports a single I2S port available on the application core. The I2S module, supports the
original two-channel I2S format, and left- or right-aligned formats.
1.10.7 Pulse density modulation (PDM) Interface
NORA-B1 supports a single PDM interface available through the application core. The PDM module
enables input of pulse density modulated signals from external audio frontends, for example, digital
microphones. The PDM module generates the PDM clock and supports single-channel or dual-channel
(left and right) data input.
1.10.8 USB 2.0 device interface
NORA-B1 supports a single, full-speed (12 Mbps) USB device (peripheral) compliant with version 2.0
of the USB specification. The USB device port is available through the application core.
The pin configuration of the USB interface is as follows:
•
VBUS, 5 V supply input, required to use the interface
•
USB_DP, USB_DM, differential data pair
The USB interface has a dedicated power supply that requires a 5 V supply voltage for the VBUS pin.
This allows the USB interface to be used even though the rest of the module might be battery powered
or supplied by a 1.8 V supply.
1.11 Antenna interface
☞
The antenna interface is different for each module variant in the NORA-B1 series.
1.11.1 U.FL connector – NORA-B100
NORA-B100 is equipped with a U.FL connector to accommodate an external antenna. The antenna
must have a characteristic impedance of 50 Ω and be designed for the 2.4 GHz band. Some external
antennas plug directly to the U.FL connector, while others use an SMA or reversed polarity SMA (RP-
SMA) connector through a short U.FL to SMA or RP-SMA adapter cable.
Antennas with an RP-SMA connector or U.FL connector are generally included in FCC, ISED, R&TTE
and MIC radio tests. Antennas with SMA connectors are included in R&TTE and MIC radio tests, but
due to FCC/ISED regulations are not included in FCC or ISED tests.
The list of approved antennas can be found in section 6.10.
NORA-B100 can be integrated with other antennas. In this instance, OEM designers must certify the
both the host system and integrated antenna with the respective regulatory agencies.
UBX-20027617 - R02
C1-Public
NORA-B1 series - System integration manual
System description
Page 15 of 58
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