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RN41/RN41N

DS50002280C-page 10

 2014-2022 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 the fol-
lowing table. 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

Yagi

15

Note:

HCI mode is only available by ordering
part RN41HCI for UART interface; or
RN41U for USB interface. 

Summary of Contents for RN41

Page 1: ...ck Bluetooth SIG qualified end product listing Castellated SMT pads for easy and reliable PCB mounting Class 1 high power amplifier with on board ceramic chip antenna RN41 or external antenna RN41N Co...

Page 2: ...r s Guide RN41 RN41 MODULE VARIANTS 1 Model Antenna Firmware Description RN41 Ceramic Chip 4 77 6 15 Class 1 2 1 EDR SPP profile RN41HCI Ceramic Chip N A Class 1 2 0 EDR HCI over UART RN41U Ceramic Ch...

Page 3: ...g DS30000000A is version A of document DS30000000 Errata An errata sheet describing minor operational differences from the data sheet and recommended workarounds may exist for current devices As devi...

Page 4: ...mmended for applications that transmits a continuous stream of data The module can be configured locally via the UART or over the air To support instant cable replacement auto discovery pairing does n...

Page 5: ...10 9 dBm 2 480 9 9 dBm Initial Carrier Frequency Tolerance 2 402 5 75 75 kHz 2 441 5 75 kHz 2 480 5 75 kHz 20 dB Bandwidth for Modulated Carrier 900 1000 1000 kHz Drift Five Slots Packet 15 40 kHz Dri...

Page 6: ...DUH LQ PLOOLPHWHUV 6LGH 9LHZ GND SPI_MOSI GPIO6 GPIO7 RESET SPI_CLOCK PCM_CLK PCM_SYNC PCM_IN PCM_OUT VDD GND SPI_MISO SPI_CSB GPIO4 GPIO5 GPIO3 GPIO2 USB_D USB_D UART_CTS UART_RTS UART_TX UART_RX 1...

Page 7: ...s high to disable host transmitter 16 UART_CTS DI UART CTS if set high it disables transmitter 17 USB_D DIO USB port 1 5K pullup activated when USB port is ready 500 ms after reset 18 USB_D DIO USB po...

Page 8: ...ow high transitions 2 3 Connection Status GPIO5 is available to drive an LED and it blinks at var ious speeds to indicate status see Table 2 1 GPIO2 is an output that directly reflects the connection...

Page 9: ...LS PP PP PP PP PP LPHQVLRQV DUH LQ PLOOLPHWHUV 7RS 9LHZ Top Layer Signal Trace Keep Out Area Shield Pads X4 0 8 mm x 1 3 mm Do not locate vias or signal traces under Shield Pads Edge of Ground Plane K...

Page 10: ...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...

Page 11: ...PCB using standard leaded and lead free solder reflow profiles To avoid damaging the module the following recom mendations are given Microchip Technology Application Note AN233 Solder Reflow Recommen...

Page 12: ..._N PIO6 PIO7 PIO4 PIO5 PIO3 PIO2 A IO1 A IO0 PIO11 PIO10 PIO9 PIO8 3 3V PCM_CL K PCM_SYNC PCM_OUT PCM_I N 100k R17 300k R18 100k R16 300k R15 V B 1 V B 2 A IO0 A IO1 1 2 3 4 5 6 7 8 9 10 11 12 J1 HEAD...

Page 13: ...st product to requirements for unintentional radiators Part 15 Sub part B Unintentional Radiators such as digital devices computer peripherals radio receivers etc and to additional authorization requi...

Page 14: ...less than 20 cm from per sons during operation the integrator is responsible for performing Specific Absorption Rate SAR testing in accordance with the guidance in KDB 447498 3 1 3 APPROVED EXTERNAL A...

Page 15: ...approved with the transmitter and may be used and marketed with the transmitter When a measurement at the antenna connector is used to determine RF output power the effective gain of the device s ant...

Page 16: ...Hereby Microchip Technology Inc declares that the radio equipment type RN41 41N is in compliance with Directive 2014 53 EU The full text of the EU declaration of conformity for this product is availab...

Page 17: ...w Zealand General User Radio License for Short Range Devices New Zealand Radio communications Radio Standards Notice 2010 calls up the AS NZS 4268 2008 industry standard The RN41 RN41N mod ule test re...

Page 18: ...ipment type RN41 RN41N is in compliance with the Radio Equipment Regulations 2017 The full text of the UKCA declaration of conformity for this product is available under Documents Certifica tions at h...

Page 19: ...g and a list of distributors carrying Microchip products TABLE 4 1 ORDERING INFORMATION Part Number 1 Firmware 2 Description RN41 I RM Latest Production Class 1 2 1 EDR SPP profile RN41 I RM615 6 15 C...

Page 20: ...RN41 RN41N DS50002280C page 20 2014 2022 Microchip Technology Inc NOTES...

Page 21: ...e documents referenced within this document The following table shows the relevant terminology changes made in this document Revision A August 2014 This is the initial released version of the document...

Page 22: ...RN41 RN41N DS50002280C page 22 2014 2022 Microchip Technology Inc NOTES...

Page 23: ...files Ceramic Chip Antenna Temperature Range I 40 C to 85 C Package RM Radio Module All package offerings are Pb Free Lead Free Examples a RN41 I RM Ceramic Chip Antenna Latest production firm ware ve...

Page 24: ...RN41 RN41N DS50002280C page 24 2014 2022 Microchip Technology Inc NOTES...

Page 25: ...chip sales offices distributors and factory representatives CUSTOMER CHANGE NOTIFICATION SERVICE Microchip s customer notification service helps keep customers current on Microchip products Subscriber...

Page 26: ...RN41 RN41N DS50002280C page 26 2014 2022 Microchip Technology Inc NOTES...

Page 27: ...peed Control HyperLight Load Libero motorBench mTouch Powermite 3 Precision Edge ProASIC ProASIC Plus ProASIC Plus logo Quiet Wire SmartFusion SyncWorld Temux TimeCesium TimeHub TimePictra TimeProvide...

Page 28: ...86 27 5980 5300 China Xian Tel 86 29 8833 7252 China Xiamen Tel 86 592 2388138 China Zhuhai Tel 86 756 3210040 ASIA PACIFIC India Bangalore Tel 91 80 3090 4444 India New Delhi Tel 91 11 4160 8631 Indi...

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