RN-42-DS [ETC]
RN-42/RN-42-N Class 2 Bluetooth Module; RN - 42 / RN - 42 -N 2级蓝牙模块
| 型号： | RN-42-DS |
| 厂家： | 
ETC |
| 描述： | RN-42/RN-42-N Class 2 Bluetooth Module |
| 文件： | 总12页 (文件大小：765K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RN-42-DS
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RN-42/RN-42-N Class 2 Bluetooth Module
Features
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Fully qualified Bluetooth® version 2.1 module,
supports version 2.1 + 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 (RN-42) and 13.4 mm x 20 mm
x 2 mm (RN-42-N)
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Low power (26 uA sleep, 3 mA connected, 30 mA
transmit)
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Measurement and monitoring systems
Industrial sensors and controls
Medical devices
UART (SPP or HCI) and USB (HCI only) data
connection interfaces.
Sustained SPP data rates: 240 Kbps (slave), 300
Kbps (master)
Computer accessories
HCI data rates: 1.5 Mbps sustained, 3.0 Mbps
burst in HCI mode
Description
Embedded Bluetooth stack profiles included
(requires no host stack): GAP, SDP, RFCOMM, and
L2CAP protocols, with SPP and DUN profile
support
The RN-42 is a small form factor, low power, class 2
Bluetooth radio for designer’s who want to add wireless
capability to their products. The RN-42 supports
multiple interface protocols, is simple to design in, and
is fully certified, making it a complete embedded
Bluetooth solution. The RN-42 is functionally compatible
with the RN 41. With its high-performance, on-chip
antenna and support for Bluetooth EDR, the RN-42
delivers up to a 3 Mbps data rate for distances up to 20
meters.
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Bluetooth SIG certified
Castellated SMT pads for easy and reliable PCB
mounting
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Certifications: FCC, ICS, CE
Environmentally friendly, RoHS compliant
The RN-42 is also available in a package without an
antenna (RN-42-N). Useful when the application
requires an external antenna, the RN-42-N is shorter in
length and has RF pads to route the antenna signal.
Applications
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Cable replacement
Barcode scanners/readers
Figure 1. RN-42 Block Diagram
RN-42
Crystal
VCC
GND
GPIO4
GPIO5
GPIO6
USB
CSR BlueCore-04
External
RF
Switch
BALUN
UART
PCM
Flash Memory
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OVERVIEW
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Baud rate speeds: 1,200 bps up to 921 Kbps, non-standard baud rates can be programmed
Class 2 radio, 60 feet (20 meters) distance, 4 dBm output transmitter, -80 dBm typical receive sensitivity
Frequency 2,402 ~ 2,480 MHz
FHSS/GFSK modulation, 79 channels at 1-MHz intervals
Secure communications, 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 (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
Parameter
RN-42
13.4 x 25.8 x 2
0.045
RN-42-N
19 x 13.4 x 2
0.040
Units
mm
Oz.
Size
Weight
Tables 2 through 6 provide detailed specifications for the module.
Table 2. Environmental Conditions
Parameter
Value
Temperature Range (Operating)
Temperature Range (Storage)
Relative Humidity (Operating)
Relative Humidity (Storage)
-40o C ~ 85o C
-40o C ~ 85o C
≤ 90%
≤ 90%
Table 3. Digital I/O Characteristics
3.0 V ≤ VDD ≤ 3.3 V
Input Logic Level Low
Min.
-0.4
Typ.
Max.
Units
V
-
+0.8
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
+0.2
V
All I/O pins (Except reset) Default to Weak Pull Down
+1.0
+5.0
uA
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Table 4. Electrical Characteristics
Parameter
Supply voltage (DC)
Min.
Typ.
Max.
Units
3.0
3.3
3.6
V
Average Power Consumption
Radio ON (discovery or inquiry window time), Note (1)
Connected Idle (no sniff)
40
25
12
45
26
mA
mA
mA
mA
uA
Connected Idle (sniff 100 ms)
Connected with data transfer
Deep sleep idle mode
40
50
Notes:
1. If, in slave mode, there are bursts of radio ON time that vary with the windows. Depending on how you set the windows, that
determines your average current.
Table 5. Radio Characteristics
Freq.
(GHz)
Bluetooth
Specification
Parameter
Min.
Typ.
Max.
Units
Sensitivity at 0.1% BER
2.402
2.441
2.480
2.402
2.441
2.480
2.402
2.441
2.480
-
-80
-80
-80
2
-86
-86
-86
4
≤ -70
dBm
dBm
dBm
dBm
dBm
dBm
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
-
-
RF Transmit Power
0
≤ 4
0
0
2
4
2
4
Initial Carrier Frequency Tolerance
-
5
75
75
75
1,000
-
75
-
5
-
5
20dB bandwidth for modulated carrier
Drift (Five slots packet)
Drift Rate
-
900
15
13
165
165
165
190
190
190
≤ 1000
40
-
-
-
20
∆f1avg Max Modulation
2.402
2.441
2.480
2.402
2.441
2.480
140
140
140
140
140
140
175
175
175
-
> 140
∆f2avg Min Modulation
115
-
-
Table 6. Range Characteristics (Approximate Range In Office Environment)
Range
After One Wall
RN-42
55 feet
60 feet
36 feet
After Two Walls
After Three Walls
The readings shown in Table 6 are approximate and may vary depending upon the RF environment. Bluetooth hops in a
pseudo-random fashion over the 79 frequencies in the ISM band to adapt to the interference. Data throughput and range
vary depending on the RF interference environment.
Figure 2 shows the module’s pinout and Table 7 describes the pins.
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Figure 2. RN-42/RN-42-N Pinout
27 26 25
GND
SPI_MOSI
GPIO6
1
24
23
22
21
20
19
18
17
16
15
14
13
SPI_MISO
SPI_CSB
GPIO4
GND
SPI_MOSI
GPIO6
1
24
23
22
21
20
19
18
17
16
15
14
13
SPI_MISO
SPI_CSB
GPIO4
RN-42
Top View
RN-42-N
Top View
2
2
3
3
GPIO7
4
GPIO5
GPIO7
4
GPIO5
RESET
5
GPIO3
RESET
5
GPIO3
SPI_CLOCK
PCM_CLK
PCM_SYNC
PCM_IN
PCM_OUT
VDD
6
GPIO2
SPI_CLOCK
PCM_CLK
PCM_SYNC
PCM_IN
PCM_OUT
VDD
6
GPIO2
7
USB_D-
USB_D+
UART_CTS
UART_RTS
UART_TX
UART_RX
7
USB_D-
USB_D+
UART_CTS
UART_RTS
UART_TX
UART_RX
8
8
9
9
10
11
12
10
11
12
GND
GND
35 29 34 33 32 31 28 30
35 29 34 33 32 31 28 30
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Table 7. Pin Description
Pin Name
GND
Description
Default
Voltage
(V)
1
Ground
0
2
3
4
SPI_MOSI
GPIO6
Programming only
No Connect
3
Set BT master (high = auto-master mode)
Input to RN-42 with weak pulldown
Input to RN-42 with weak pulldown
0 - 3.3
0 - 3.3
GPIO7
Set Baud rate (high = force 9,600, low = 115 K or
firmware setting)
5
RESET
Active-low reset. Hold low for low-power
operation.
Input to RN-42 with 1K pullup
6
SPI_CLK
PCM_CLK
PCM_SYNC
PCM_IN
Programming only
No Connect
No Connect
No Connect
No Connect
No Connect
7
PCM interface
8
PCM interface
9
PCM interface
10
11
12
13
14
15
16
17
18
PCM_OUT
VDD
PCM interface
3.3-V regulated power input
Ground
GND
UART_RX
UART_TX
UART_RTS
UART_CTS
USB_D+
USB_D-
UART receive Input
UART transmit output
UART RTS, goes high to disable host transmitter
UART CTS, if set high, disables transmitter
USB port
Input to RN-42
0 - 3.3
0 - 3.3
0 - 3.3
0 - 3.3
0 - 3.3
0 - 3.3
High level output from RN-42
Low level output from RN-42
Low level input to RN-42
Pull up 1.5 K when active
USB port
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Pin
19
Name
GPIO2
Description
Default
Output from RN-42
Voltage
(V)
Status, high when connected, low otherwise
Auto discovery = high
0 - 3.3
0 - 3.3
0 - 3.3
0 - 3.3
20
21
22
23
24
25
26
GPIO3
GPIO5
GPIO4
SPI_CSB
SPI_MISO
GND
Input to RN-42 with weak pulldown
Output from RN42
Status, toggles based on state, low on connect
Set factory defaults
Input to RN-42 with weak pulldown
No Connect
Programming only
Programming only
No Connect
Ground for RN-42-N
RF Pad
GND
RF pad for RN-42-N
27-
29
Ground for RN-42-N
30
31
32
33
34
35
AIO0
Optional analog input
Status (RF data Rx/Tx)
I/O
Not Used
GPIO8
GPIO9
GPIO10
GPIO11
AIO1
Output from RN-42
0 - 3.3
0 - 3.3
0 - 3.3
0 - 3.3
Input to RN-42 with weak pulldown
Input to RN-42 with weak pulldown
Input to RN-42 with weak pulldown
Not Used
I/O (remote DTR signal)
I/O (remote RTS signal)
Optional analog input
Figure 3 shows the module’s physical dimensions.
Figure 3. RN-42/RN-42-N Physical Dimensions
All Dimensions Are In mm
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TYPICAL APPLICATION SCHEMATIC
Figure 4 shows a typical application schematic. Because the RN-41 and RN-42 are functionally compatible, this diagram
applies to both modules.
Figure 4. Application Schematic
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DESIGN CONCERNSꢀ
The following sections provide information on designing with the RN-42 module, including radio interference, factory reset,
solder reflow profile, connection status, etc.
Reset Circuit
The RN-42 contains a 1k pullup to VCC, and the reset polarity is active low. The module’s reset pin has an optional power-
on-reset circuit with a delay, which should only be required if the input power supply has a very slow ramp or tends to
bounce or have instability on power up. Often a microcontroller or embedded CPU I/O is available to generate the reset
once power is stable. If not, designers can use one of the many low-cost power supervisor chips currently available, such
as the MCP809, MCP102/121, and Torex XC61F.
Factory Reset Using GPIO4
Roving Networks recommends that designers connect the GPIO4 pin to a switch, jumper, or resistor so it can be accessed.
This pin can be used to reset the module to its factory default settings, which is critical in situations where the module has
been misconfigured. To reset the module to the factory defaults, GPIO4 should be high on power-up and then toggle low,
high, low, high with a 1 second wait between the transitions.
Connection Status
GPIO5 is available to drive an LED, and it blinks at various speeds to indicate status (see Table 7). GPIO2 is an output that
directly reflects the connection state as shown in Table 8.
Table 8. GPIO5 Status
GPIO5 Status
Toggle at 1 Hz
Description
The module is discoverable and waiting for a connection.
The module is in command mode.
Toggle at 10 Hz
Low
The module is connected to another device over Bluetooth.
Table 9. GPIO2 Status
GPIO2 Status
Description
High
Low
The module is connected to another device over Bluetooth.
The module is not connected over Bluetooth.
HCI Mode
Roving Networks 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 baseband. The HCI
provides a command reference interface 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.
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In this mode, the Bluetooth stack is no longer on-board the module. It is offloaded to the interfacing host processor. The
Bluetooth module is used as a radio, performing the lower level MAC functionalities, while the application stack runs on the
host processor.
Using the module in HCI mode allows designers to implement profiles that are not natively supported on the Bluetooth
module.
NOTE: HCI mode requires a separate firmware build that must be loaded into the module’s flash at the factory. Is not
upgradeable in the field.
Roving Networks offers HCI mode in two hardware interfaces:
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HCI over UART
HCI over USB
HCI over UART
In this mode, the hardware interface between the host processor and the Bluetooth module is the UART. You must
interface the flow control signals between the host processor and the Bluetooth module for the HCI interface to work.
Failure to do so can cause the host processor and the Bluetooth module to become out of sync and break the Bluetooth
link.
HCI over USB
In this mode, the hardware interface between the host processor and the Bluetooth module is the USB. In this
architecture, the Bluetooth module is the USB slave and the host processor is the USB host.
Using the USB interface offers the advantage of a faster data link between the Bluetooth module and the host processor.
With this architecture, it is possible to achieve Bluetooth’s theoretical maximum throughput of 3 Mpbs.
Low Power
To achieve low-power operation, hold the module’s RESET pin low. With RESET = 0 VDC, the module consumes 35 uA of
power. If RESET is left floating or high, the module consumes 3 mA in sleep mode. To obtain the lowest power, the RN-42
should be passive (in slave mode and not trying to make connections).
Using the SPI Bus to Upgrade the Flash Memory
While not required, this bus is very useful for configuring the Bluetooth modules’ advanced parameters. The bus is
required when upgrading the module’s firmware. The typical application schematic shown in Figure 4 shows a 6-pin
header that can be implemented to gain access to this bus. A minimum-mode version might simply use the SPI signals (4
pins) and obtain ground and VCC from elsewhere in the design.
Minimizing Radio Interference
When laying out the carrier board for the RN-42 module, the areas under the antenna and shielding connections should
not have surface traces, ground planes, or exposed vias (see Figure 5). For optimal radio performance, the RN-42
module’s antenna end should protrude at least 5 mm beyond any metal enclosure.
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Figure 5. Minimizing Radio Interference
1.5 mm
1.5 mm
7.0 mm
13.4 mm
Do not located any surface
parts, surface traces, internal
traces, or ground planes under
the antenna area.
1
2
3
4
5
6
7
8
9
24
Do not locate vias
or surface traces
under shield
connectors
(1.5 mm square).
23
22
21
10
19
18
17
16
15
14
13
25.6 mm
10
11
12
29 33 31 30
34 32 28
35
1.5 mm
1.5 mm
Top View
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Because the RN-42-N does not contain an antenna, it does not carry regulatory approvals.
If designers use Roving Networks recommended design, they can file for a permissible antenna change and use Roving
Networks’ regulatory approvals. The recommended antenna design for the RN-42 is a PCB trace antenna. To meet the
regulatory compliance information, customers must use the trace pattern shown in Figure 6.
Figure 6. Antenna Trace Pattern
140 mil
80 mil
Ground
Plane
Limit
40 mil
40 mil
Trace Width Is 20 mil
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If designers choose to use another antenna, they must go through the regulatory approval process.
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Antenna Design
The pattern from the RF_OUT terminal pad should be designed with 50 ohms impedance and traced with straight lines
(see Figure 7). The RF_OUT signal line should not run under or near the RN-21 module. The GND plane should be on the
side of the PCB to which the module is mounted. GND should be reinforced with through-hole connections and other
means to stabilize the electric potential.
Figure 7. Antenna Design
GND
RF_OUT
GND
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Solder Reflow Profile
The lead-free solder reflow temperature and times are:
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Temperature—230° C, 30 - 40 seconds, peak 250° C maximum
Preheat temperature—165° 15° C, 90 to 120 seconds
Time—Single pass, one time
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COMPLIANCE INFORMATION
Table 10 describes the module’s compliance information.
Table 10. Compliance Information
Category
Country
Standard
FCC Part 15 Subpart B: 2008 Class B
FCC CRF Title 47 Part 15 Subpart C
T9J-RN42
Radio
USA
FCC ID:
Europe
ETSI EN 301 489-1 V1.8.1
ETSI EN 301 489-17 V2.1.1
ETSI EN 300 328 V1.7.1
Canada
IC RSS-210 low power comm. device
6514A-RN42
Certification Number:
EMC
USA
FCC CFR47 Part 15 subclass B
EN 55022 Class B radiated
EN61000-4-2 ESD immunity
EN61000-4-3 radiated field
EN61000-4-6 RF immunity
EN61000-4-8 power magnetic immunity
B014867- SPP and DUN profiles
RoHS compliant
Europe
Bluetooth
BQB LISTED
RoHS
Environmental
ORDERING INFORMATION
Table 11 provides ordering information.
Table 11. Ordering Information
Part Number
Description
RN-42
Standard application firmware (SPP/DUN master and slave).
HCI firmware (HCI over H4 UART).
RN-42-HCI
RN-42-USB
RN-42-N
USB firmware (HCI over USB port, slave device at 12-Mbps rate).
Standard application firmware (SPP/DUN master and slave) without antenna.
For other configurations, contact Roving Networks directly.
Go to http://www.rovingnetworks.com for current pricing and a list of distributors carrying Roving Networks products.
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Version 2.31r 10/15/2012
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REVISION HISTORY
Version 2.31r 10/15/2012
•
Updated the GPIO5 status table to correctly show that when GPIO5 is low, it indicates that the module is
connected to another device over Bluetooth.
•
Added information on pins 28 and 29 to the pinout table.
Copyright © 2012 Roving Networks. All rights reserved. Roving Networks is a
registered trademark of Roving Networks. Apple Inc., iPhone, iPad, iTunes, Made
for iPhone are registered trademarks of Apple Computer.
Roving Networks reserves the right to make corrections, modifications, and other
changes to its products, documentation and services at any time. Customers
should obtain the latest relevant information before placing orders and should verify
that such information is current and complete.
Roving Networks assumes no liability for applications assistance or customer’s
product design. Customers are responsible for their products and applications
which use Roving Networks components. To minimize customer product risks,
Roving Networks, Inc.
102 Cooper Court
Los Gatos, CA 95032
+1 (408) 395-5300
www.rovingnetworks.com
customers should provide adequate design and operating safeguards.
Roving Networks products are not authorized for use in safety-critical applications
(such as life support) where a failure of the Roving Networks product would
reasonably be expected to cause severe personal injury or death, unless officers of
the parties have executed an agreement specifically governing such use.
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