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RN41 Datasheet(PDF) 10 Page - Microchip Technology |
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RN41 Datasheet(HTML) 10 Page - Microchip Technology |
10 / 28 page RN41/RN41N DS50002280A-page 10 2014 Microchip Technology Inc. FIGURE 2-5: RN41 HOST PCB EXAMPLE LAYOUT 2.5 External Antenna Types (RN41N) The RN41N module’s antenna pin (pin 25) provides a 50-ohm impedance to external antennas. Pin 25 can connect directly to a coaxial cable or to an antenna connector such as a U.FL or reverse polarity SMA. The PCB trace from pin 25 to the coaxial cable or con- nector should be less than 0.2 inches (5 mm) for mini- mum loss and the best impedance match. If the PCB trace is longer, it should be a 50-ohm impedance microstrip trace. Connect adjacent ground pins 24 and 26 to a low-impedance ground on the host PCB and the antenna connection. Figure 2-4 gives example host PCB layout to a U.FL connector. Modular certification of the RN41N module was per- formed with the external antenna types listed in Table 2-3. Refer to Section 3.0 “Regulatory Approval” for specific regulatory requirements by country. 2.6 HCI Mode Microchip offers the Host Controller Interface (HCI) mode in addition to the standard operational mode of its Bluetooth modules (standard mode refers to the on- board stack running on the module). In HCI mode, the on-board stack is bypassed and the module is put in a state that runs the Bluetooth base- band. The HCI provides a command reference inter- face to the baseband controller and the link manager, and provides access to the hardware status and control registers. This interface provides a uniform method for accessing the Bluetooth baseband capabilities. In this mode, the Bluetooth stack is no longer on-board the module. It is offloaded to the interfacing host pro- cessor. The Bluetooth module is used as a radio, per- forming the lower level MAC functionalities, while the application stack runs on the host processor. Using the module in HCI mode enables designers to implement profiles that are not natively supported on the Bluetooth module. No Copper In these Areas RN-41 Okay RN-41 Best RN-41 Okay RN-41 Okay TABLE 2-3: TESTED EXTERNAL ANTENNA TYPES Type Gain (dBi) Monopole 0.56 Whip 8 Yagi 15 Note: HCI mode is only available by ordering part RN41HCI for UART interface; or RN41U for USB interface. |
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