Microchip Technology RN41N Users manual
RN-41/RN-41-N Class 1 Bluetooth Module
RN-41-DS
Features
• Fully qualified Bluetooth
Enhanced Data Rate (EDR)
• Backwards-compatible with Bluetooth version 2.0, 1.2, and 1.1
• Postage stamp sized form factor, 13.4 mm x 25.8 mm x 2 mm
• Low power (30 mA connected, < 10 mA sniff mode)
• UART (SPP or HCI) and USB (HCI only) data connection interfaces
• Sustained SPP data rates: 240 Kbps (slave), 300 Kbps (master)
• HCI data rates: 1.5 Mbps sustained, 3.0 Mbps burst in HCI mode
• Embedded Bluetooth stack profiles included (requires no host stack):
GAP, SDP, RFCOMM, and L2CAP protocols, with SPP and DUN profile
support
• Bluetooth SIG qualified, end product listing
• Castellated SMT pads for easy and reliable PCB mounting
• Class 1 high power amplifier with on board ceramic RF chip antenna
(RN-41) or without antenna (RN-41-N)
• Certifications: FCC, ICS, CE
• Environmentally friendly, RoHS compliant
®
version 2.1 module, supports version 2.1 +
Applications
• Cable replacement
• Barcode scanners
• Measurement and monitoring systems
• Industrial sensors and controls
• Medical devices
• Asset tracking
Description
The RN-41 module is a small form factor, low power, class 1 Bluetooth radio
that is ideal for designers who want to add wireless capability to their
products without spending significant time and money developing Bluetoothspecific hardware and software. The RN-41 supports multiple interface
protocols, is simple to design in, and is fully certified, making it a complete
embedded Bluetooth solution. With its high-performance, on-chip antenna
and support for Bluetooth EDR, the RN-41 delivers up to a 3-Mbps data rate
for distances up to 100 meters. The RN-41 is also available without an
antenna (RN-41-N).
Figure 1. RN-41 Block Diagram
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OVERVIEW
• Baud rate speeds: 1,200 bps up to 921 Kbps, non-standard baud rates can be programmed
• Class 1 radio, 330’ (100 m) range, 15 dBm output transmitter, -80 dBm typical receive sensitivity
• Frequency 2,402 ~ 2,480 MHz
• FHSS/GFSK modulation, 79 channels at 1-MHz intervals
• Secure communication, 128-bit encryption
• Error correction for guaranteed packet delivery
• Configuration via the local UART and over-the-air RF
• Auto-discovery/pairing does not require software configuration (supports instant cable replacement)
• Auto-connect master, I/O pin (DTR), and character-based trigger modes
The module’s moisture sensitivity level (MSL) is 1. Table 1 shows the module’s size and weight.
Table 1. Module Size & Weight
RN-41-DS
Parameter RN-41 RN-41-N Units
Size 13.4 x 25.8 x 2 13.4 x 19 x 2 mm
Weight 0.055 0.020 Oz.
Tables 2 through 5 provide detailed specifications for the module.
Table 2. Environmental Conditions
Parameter Value
Temperature Range (Operating) -40o C ~ 85o C
Temperature Range (Storage) -40o C ~ 85o C
Relative Humidity (Operating)
Relative Humidity (Storage)
90%
90%
Table 3. Electrical Characteristics
Parameter Min. Typ. Max. Units
Supply Voltage (DC) 3.0 3.3 3.6 V
RX Supply Current 35 60 mA
TX Supply Current 65 100 mA
Average Power Consumption
Standby/Idle (Default Settings) 25 mA
Connected (Normal Mode) 30 mA
Connected (Low-Power Sniff) 8 mA
Standby/Idle (Deep Sleep Enabled) 250 2.5 mA
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Table 4. Radio Characteristics
RN-41-DS
Parameter Frequency
Sensitivity at 0.1% BER
RF Transmit Power
Initial Carrier Frequency Tolerance
20-dB Bandwidth for Modulated Carrier - 900 1000 ≤ 1000 kHz
Drift (Five Slots Packet) - 15 - 40 kHz
Drift Rate - 13 - 20 kHz
∆f1
Maximum Modulation
avg
∆f2
Minimum Modulation
avg
(GHz)
2.402 - -80 -86 dBm
2.441 - -80 -86 dBm
2.480 - -80 -86
2.402 15.0 16.0 dBm
2.441 15.0 16.0 dBm
2.480 15.0 16.0
2.402 - 5 75 kHz
2.441 - 5 75 kHz
2.480 - 5 75
2.402 140 165 175 kHz
2.441 140 165 175 kHz
2.480 140 165 175
2.402 140 190 - kHz
2.441 140 190 - kHz
2.480 140 190 -
Min. Typ. Max. Bluetooth
Specification
≤ -70
≤ 20
75
> 140
115
Units
dBm
dBm
kHz
kHz
kHz
Table 5. Digital I/O Characteristics
3.0 V ≤ VDD ≤ 3.3 V Min. Typ. Max. Units
Input Logic Level Low -0.4 - +0.8 V
Input Logic Level High 0.7 VDD - VDD + 0.4 V
Output Logic Level Low - - 0.2 V
Output Logic Level High VDD - 0.2 - - V
All I/O pins (Except reset) Default to Weak Pull Down +0.2 +1.0 +5.0 uA
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Figure 2 shows the pinout and Table 6 describes the pins.
Figure 2. RN-41/RN-41-N Pinout
RN-41-DS
Table 6. Pin Description
Pin Name Description Default
1 GND Ground –
2 SPI_MOSI Programming only No connect
3 GPIO6 Set Bluetooth master (high = auto-master mode) Input to RN-41with weak pulldown
4 GPIO7 Set baud rate (high = force 9,600, low = 115 K
or firmware setting)
5 RESET Active-low reset Input to RN-41 with 1K pullup
6 SPI_CLK Programming only No Connect
7 PCM_CLK PCM interface No Connect
8 PCM_SYNC PCM interface No Connect
9 PCM_IN PCM interface No Connect
10 PCM_OUT PCM interface No Connect
11 VDD 3.3-V regulated power input –
12 GND Ground –
13 UART_RX UART receive input Input to RN-41
14 UART_TX UART transmit output High level output from RN-41
Input to RN-41 with weak pulldown
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RN-41-DS
Pin Name Description Default
15 UART_RTS UART RTS, goes high to disable host transmitter Low level output from RN-41
16 UART_CTS UART CTS, if set high, it disables transmitter Low level input to RN-41
17 USB_D+ USB port 1.5 K pullup activated when USB
port is ready (~500 ms after reset)
18 USB_D- USB port –
19 GPIO2 Status, high when connected, low otherwise Output from RN-41
20 GPIO3 Auto discovery = high Input to RN-41 with weak pulldown
21 GPIO5 Status, toggles based on state, low on connect Output from RN-41
22 GPIO4 Set factory defaults Input to RN-41 with weak pulldown
23 SPI_CSB Programming only No connect
24 SPI_MISO Programming only No connect
25 - 27 NC RF pad, keep all traces and planes clear –
28 - 29 GND Ground –
30 AIO0 Optional analog input Not used
31 GPIO8 Status (RF data RX/TX) Output from RN-41
32 GPIO9 I/O Input to RN-41 with weak pulldown
33 GPIO10 I/O (remote DTR signal) Input to RN-41 with weak pulldown
34 GPIO11 I/O (remote RTS signal) Input to RN-41 with weak pulldown
35 AIO1 Optional analog input Not Used
Figure 3 shows the module’s physical dimensions.
Figure 3. RN-41/RN-41-N Physical Dimensions
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