Ublox NINA-B4 Series, Руководство по системной интеграции, Страница: 21 / 61

NINA-B4 series - System integration manual
UBX-19052230 - R09 Design-in Page 21 of 61
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2.5.1.4 Analog pin options
Table 13 shows the supported connections of the analog functions.
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An analog pin may not be simultaneously connected to multiple functions.
Symbol Analog function Connects to
ADCP ADC single-ended or differential positive input Any analog pin or VCC
ADCN ADC differential negative input Any analog pin or VCC
VIN+ Comparator input Any analog pin
VREF Comparator single-ended mode reference
ladder input Any analog pin, VCC, 1.2 V, 1.8 V or 2.4 V
VIN- Comparator differential mode negative input Any analog pin
Low-power comparator IN+ Any analog pin
LP_VIN- Low-power comparator IN- GPIO_16 or GPIO_18, 1/16 to 15/16 VCC in steps of 1/16 VCC
Table 13: Possible uses of the analog pin
2.6 Antenna interface
To optimize the radiated performance of the final product, the selection and placement of both the
module and antenna must be chosen with due regard to the mechanical structure and electrical
design of the product. To avoid later redesigns, it is important to decide the positioning of these
components at an early phase of the product design.
Carefully consider the placement of an embedded antenna in NINA-B4x6, or an external antenna
(connected through SMD assembly or RF connector) in NINA-B4x0 and NINA-B4x1.
Choose a module variant that supports an external antenna if the product includes a metal product
enclosure
– or if any of the NINA-B4x6 antenna layout considerations for integrating an internal PCB
trace antenna into the design prove impractical.
• NINA-B4x0 modules include a U.FL connector for connecting an external antenna. Some antennas
connect directly to the U.FL, while others connect through a short U.FL or reversed polarity SMA
adapter cable.
o
Antennas with SMD connections, either reverse-polarity SMA connectors or U.FL connectors,
are radio tested and verified against regulatory FCC, IC, RED, and MIC standards.
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Antennas with SMA connectors are radio tested and verified against regulatory RED and MIC
radio tests, but not against FCC or IC standards.
• NINA-B4x1 modules include an ANT pad for connecting an external antenna. The antenna can be
either an external SMD antenna or an antenna that is connected through an externally
assembled U.FL or SMA connector. See also
External RF Connector Design-in (NINA-B4x1) and
External antenna design-in (NINA-B4x1) .
• NINA-B4x6 modules include an embedded PCB Niche antenna. See also NINA-B4x6 design-in .
A list of u-blox-approved external antennas, together with regulatory information for NINA-B4x0 and
NINA-B4x1, can be found in the NINA-B4 series certification application note
[8] .
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Although customers are actively encouraged to add their own antennas and connector designs,
all custom antenna and connector designs must be approved by u-blox and in some cases, tested.
Contact your local u-blox support team for more information about this process.