Silicon Laboratories Finland WT41E Bluetooth Module WT41-E User Manual WT41 E Datasheet

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WT41-E
DATA SHEET
Friday, 09 September 2011
Version 1.1
Copyright © 2000-2011 Bluegiga Technologies
All rights reserved.
Bluegiga Technologies assumes no responsibility for any errors which may appear in this manual.
Furthermore, Bluegiga Technologies reserves the right to alter the hardware, software, and/or specifications
detailed here at any time without notice and does not make any commitment to update the information
contained here. Bluegiga’s products are not authorized for use as critical components in life support devices
or systems.
The WRAP is a registered trademark of Bluegiga Technologies
The Bluetooth trademark is owned by the Bluetooth SIG Inc., USA and is licensed to Bluegiga Technologies.
All other trademarks listed herein are owned by their respective owners.
Bluegiga Technologies Oy
VERSION HISTORY
Version
Comment
1.1
Power vs supply voltage figure added
1.0
Release
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TABLE OF CONTENTS
WT41-E ................................................................................................................................................................ 1
Data Sheet ........................................................................................................................................................... 1
Ordering Information..................................................................................................................................... 7
Pinout and Terminal Description .................................................................................................................. 8
Electrical Characteristics ............................................................................................................................ 11
3.1
Absolute Maximum Ratings ................................................................................................................ 11
3.2
Recommended Operating Conditions ................................................................................................. 11
3.3
PIO Current Sink and Source Capability ............................................................................................. 11
3.4
Transmitter Performance For BDR ..................................................................................................... 12
3.5
Radiated Spurious Emissions ............................................................................................................. 13
3.6
Receiver Performance ........................................................................................................................ 14
3.7
Current Consumption .......................................................................................................................... 14
3.8
Antenna Specification ......................................................................................................................... 15
Layout Guidelines ....................................................................................................................................... 18
UART Interface ........................................................................................................................................... 19
5.1
UART Bypass ...................................................................................................................................... 21
5.2
UART Configuration While Reset is Active ......................................................................................... 21
5.3
UART Bypass Mode ............................................................................................................................ 21
USB Interface ............................................................................................................................................. 22
6.1
USB Data Connections ....................................................................................................................... 22
6.2
USB Pull-Up resistor ........................................................................................................................... 22
6.3
USB Power Supply .............................................................................................................................. 22
6.4
Self-Powered Mode ............................................................................................................................. 22
6.5
Bus-Powered Mode ............................................................................................................................. 23
6.6
USB Suspend Current ......................................................................................................................... 24
6.7
USB Detach and Wake-Up Signaling ................................................................................................. 24
6.8
USB Driver .......................................................................................................................................... 25
6.9
USB v2.0 Compliance and Compatibility ............................................................................................ 25
Serial Peripheral Interface (SPI)................................................................................................................. 26
PCM Codec Interface ................................................................................................................................. 27
8.1
PCM Interface Master/Slave ............................................................................................................... 27
8.2
Long Frame Sync ................................................................................................................................ 28
8.3
Short Frame Sync ............................................................................................................................... 28
8.4
Multi-slot Operation ............................................................................................................................. 29
8.5
GCI Interface ....................................................................................................................................... 29
8.6
Slots and Sample Formats .................................................................................................................. 30
8.7
Additional Features ............................................................................................................................. 31
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8.8
PCM_CLK and PCM_SYNC Generation ............................................................................................ 31
8.9
PCM Configuration .............................................................................................................................. 32
I/O Parallel Ports ........................................................................................................................................ 34
9.1
10
PIO Defaults ........................................................................................................................................ 34
Reset ....................................................................................................................................................... 35
10.1
11
Pin States on Reset ..................................................................................................................... 36
Certifications ........................................................................................................................................... 37
11.1
Bluetooth ...................................................................................................................................... 37
11.2
FCC and IC .................................................................................................................................. 37
11.2.1
FCC et IC ..................................................................................................................................... 39
11.3
CE ................................................................................................................................................ 41
11.4
Japan ........................................................................................................................................... 41
11.5
Qualified Antenna Types for WT41-E .......................................................................................... 41
12
Contact Information................................................................................................................................. 43
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WT41 Bluetooth® Module
DESCRIPTION
WT41-E is a long range class 1, Bluetooth® 2.1 +
EDR module. WT41-E is a highly integrated and
sophisticated Bluetooth® module, containing all the
necessary elements from Bluetooth® radio and a
fully implemented protocol stack. Therefore WT41-E
provides an ideal solution for developers who want
to integrate Bluetooth® wireless technology into
their design with limited knowledge of Bluetooth®
and RF technologies. WT41-E is optimized for long
range applications and since it contains a RF power
amplifier, low noise amplifier and a u.fi connector for
an external 2 dBi dipole antenna. With 115 dB radio
budget WT41-E can reach over 1 km range in line
off sight.
By default WT41-E module is equipped with
powerful and easy-to-use iWRAP firmware. iWRAP
enables users to access Bluetooth® functionality
with simple ASCII commands delivered to the
module over serial interface - it's just like a
Bluetooth® modem.
FEATURES:













Fully Qualified Bluetooth v2.1 + EDR end
product, CE and FCC and IC
TX power : 19 dBm
RX sensitivity : -92 dBm
Higly efficient chip antenna, U.FL connector or
RF pin
Class 1, range up to 800 meters
Industrial temperature range from -40oC to
+85oC
RoHS Compliant
USB interface (USB 2.0 compatible)
UART with bypass mode
6 x GPIO
1 x 8-bit AIO
Support for 802.11 Coexistence
Integrated iWRAPTM Bluetooth stack or HCI
firmware
APPLICATIONS:








Hand held terminals
Industrial devices
Point-of-Sale systems
PCs
Personal Digital Assistants (PDAs)
Computer Accessories
Access Points
Automotive Diagnostics Units
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1 Ordering Information
WT41-E-HCI
Firmware
HCI =
HCI21=
HCI30=
AI
AI3 =
AI4 =
HCI firmware (Bluetooth 2.0 + EDR)
HCI firmware (Bluetooth 2.1 + EDR)
HCI firmware (Bluetooth 3.0)
iWRAP 2.2.0
iWRAP 3.0.0
iWRAP 4.0.0
HW version
u.fl connector
Product series
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Page 7 of 43
Pinout and Terminal Description
59
58
57
56
55
54
53
GND
GND
GND
GND
GND
GND
GND
Pins 1 and 52 (GND)
are not connected
and have been
removed
51
RF
RFGND 50
GND
GND
GND
GND
GND
GND
GND
GND
GND
VDD_PA
PIO2
PIO3
UART_RTS
UART_RX
GND
USB+
USBUART_CTS
PCM_IN
PCM_CLK
PCM_SYNC
GND
GND
GND
GND
GND
GND
GND
AIO
UART_TX
PIO5
SPI_MOSI
SPI_MISO
SPI_CLK
SPI_CSB
GND
PIO7
PIO6
RESET
VDD
GND
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
24
25
26
27
28
29
30
GND
PCM_OUT
GND
GND
GND
PIO4
GND
10
11
12
13
14
15
16
17
18
19
20
21
22
23
Figure 1: WT41-E pin out
PIN
NUMBER
NC
RESET
GND
1, 52
33
2-10, 16,
23,24,2628, 30,
31,36,4449 53-59
PAD TYPE
DESCRIPTION
Pins 1 and 52 (GND) have been removed
from the module.
Input, weak internal pull- Active low reset. Keep low for >5 ms
to cause a reset
up
Not connected
GND
RF
51
RF output
RFGND
50
GND
VDD_PA
11
Supply voltage
VDD
32
Supply voltage
GND
RF output for WT41-N. For WT41-A
and WT41-E this pin is not connected
RF ground. Connected to GND internally to
the module.
Supply voltage for the RF power amplifier
and the low noise amplifier of the module
Supply voltage for BC4 and the flash
memory
Table 1: Supply and RF Terminal Descriptions
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Page 8 of 43
PIO PORT
PIN
PAD TYPE
NUMBER
DESCRIPTION
PIO[2]
12
Bi-directional, programmamble
strength internal pull-down/pull-up
Programmamble input/output
line
PIO[3]
13
Bi-directional, programmamble
strength internal pull-down/pull-up
Programmamble input/output
line
PIO[4]
29
Bi-directional, programmamble
strength internal pull-down/pull-up
Programmamble input/output
line
PIO[5]
41
Bi-directional, programmamble
strength internal pull-down/pull-up
Programmamble input/output
line
PIO[6]
34
Bi-directional, programmamble
strength internal pull-down/pull-up
Programmamble input/output
line
PIO[7]
35
Bi-directional, programmamble
strength internal pull-down/pull-up
Programmamble input/output
line
AIO[1]
43
Bi-directional
Programmamble analog
input/output line
Table 2: GPIO Terminal Descriptions
SPI
INTERFACE
PIN
NUMBER
PAD TYPE
DESCRIPTION
CMOS output, tri-state,
Synchronous data output
weak internal pull-down
PCM_OUT
25
PCM_IN
20
CMOS input, weak
internal pull-down
Synchronous data input
PCM_SYNC
22
Bi-directional, weak
internal pull-down
Synchronous data sync
PCM_CLK
21
Bi-directional, weak
internal pull-down
Synchronous data clock
Table 3: PCM Terminal Descriptions
UART
Interfaces
PIN
NUMBER
UART_TX
42
UART_RTS#
14
UART_RX
15
UART_CTS#
19
PAD TYPE
CMOS output, tristate, with weak
internal pull-up
CMOS output, tristate, with weak
internal pull-up
CMOS input, tristate, with weak
internal pull-down
CMOS input, tristate, with weak
internal pull-down
DESCRIPTION
UART data output, active high
UART request to send, active low
UART data input, active high
UART clear to send, active low
Table 4: UART Terminal Descriptions
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Page 9 of 43
USB Interfaces
PIN
NUMBER
PAD TYPE
USB+
17
Bidirectional
USB-
18
Bidirectional
DESCRIPTION
USB data plus with selectable internal 1.5k
pull-up resistor
USB data minus
Table 5: USB Terminal Descriptions
SPI
INTERFACE
PIN
NUMBER
SPI_MOSI
40
SPI_CS#
37
SPI_CLK
38
SPI_MISO
39
PAD TYPE
CMOS input with weak
internal pull-down
CMOS input with weak
internal pull-up
CMOS input with weak
internal pull-down
CMOS output, tristate,
with weak internal pull
down
DESCRIPTION
SPI data input
Chip select for Serial Peripheral
Interface, active low
SPI clock
SPI data output
Table 6: Terminal Descriptions
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Page 10 of 43
3
Electrical Characteristics
3.1 Absolute Maximum Ratings
Rating
Storage Temperature
Min
-40
Max
85
Unit
°C
VDD_PA, VDD
-0.4
3.6
VSS-0.4
VDD+0.4
Max
85
3.6
Unit
°C
Other Terminal Voltages
Table 7: Absolute Maximum Ratings
3.2 Recommended Operating Conditions
Rating
Operating Temperature Range
*)
VDD_PA, VDD
Min
-40
3.0
*) VDD_PA has an effect on the RF output power.
Table 8: Recommended Operating Conditions
3.3 PIO Current Sink and Source Capability
Figure 2: WT41-E PIO Current Drive Capability
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Page 11 of 43
3.4 Transmitter Performance For BDR
Antenna gain 2.3dBi taken into account
RF Characetristics, VDD = 3.3V @ room
temperature unless otherwise specified
Min
Typ
Max
Bluetooth
Specification
maximum RF Transmit Power
17
19
20
20
RF power variation over temperature range
‐
dB
RF power variation over supply voltage range (*
‐
dB
19
‐
dB
1000
kHz
0.1
‐10
RF power variation over BT band
RF power control range (*
20dB band width for modulated carrier
F = F0 ± 2MHz
ACP (1
0.5
942
‐20
‐20
F = F0 ± 3MHz
‐40
‐40
F = F0 > 3MHz
‐40
‐40
+/‐25
140<175
140<175
>=0.8
Drift rate
ΔF1avg
ΔF1max
ΔF2avg / ΔF1avg
169
161
1.1
Unit
dBm
kHz
kHz
kHz
Table 9: Transmitter performance for BDR
Figure 3: Typical TX power as a function of VDD_PA
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Page 12 of 43
3.4.1 Radiated Spurious Emissions
Measured from WT41-E evaluation board
Standard
FCC part 15
transmitter
spurious
emissions
Min
Band / Frequency (AVG /
PEAK)
2nd harmonic
3rd harmonic
Band edge
2390MHz
Band edge
2483.5MHz
Band edge
2400MHz
(conducted)
Band edge
2483.5MHz
(conducted)
Band edge
ETSI EN 300 328
2400MHz
transmitter
spurious
2nd harmonic
emissions
3rd harmonic
ETSI EN 300 328 (2400 ‐ 2479) MHz
receiver spurious (1600 ‐ 1653) MHz
Typ
(AVG /
PEAK)
52
51
Max
(AVG /
PEAK)
54/58
54/58
50/60
52/65
Limit by the Standard
(AVG / PEAK)
Unit
54 / 74
54 / 74
dBuV/m
dBuV/m
52/63
54 / 74
dBuV/m
54/67
54 / 74
dBuV/m
‐50
‐20
dBc
‐58
‐20
dBc
‐30
dBm
‐30
‐30
‐47
dBm
dBm
dBm
‐47
dBm
‐39
‐36
‐41
‐41
‐
‐52
Table 10: Radiated spurious emission for WT41-E
Standard
2nd harmonic
3rd harmonic
Band edge
2390MHz
FCC part 15
Band edge
transmitter
2483.5MHz
spurious emissions Band edge 2400
MHz (conducted)
Band edge
3483.5MHz
(conducted)
Band edge
ETSI EN 300 328
2400MHz
transmitter
2nd harmonic
spurious emissions
3rd harmonic
ETSI EN 300 328 (2400 ‐ 2479) MHz
receiver spurious (1600 ‐ 1653) MHz
Min
Max
Typ (AVG
(AVG /
(AVG /
/ PEAK)
PEAK)
PEAK)
<48/55
50/56
<48/51
48/52
Limit by the Standard
(AVG / PEAK)
Unit
54 / 74
54 / 74
dBuV/m
dBuV/m
50/60
52/63
54 / 74
dBuV/m
52/65
54/67
54 / 74
dBuV/m
‐50
‐20
dBc
‐58
‐20
dBc
‐30
dBm
‐30
‐30
‐47
dBm
dBm
dBm
‐47
dBm
‐39
‐36
Table 11: Radiated spurious emission for WT41-E
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Page 13 of 43
3.5 Receiver Performance
Antenna gain not taken into account
RF characteristis, VDD = 3.3V,
Packet type
room temperature (**
Sensitivity for 0.1% BER
DH1
DH3
DH5
2‐DH1
2‐DH3
2‐DH5
3‐DH1
3‐DH3
3‐DH5
Sensitivity variation over
temperature range
Min
Typ
Max
‐92
‐92
‐91
‐94
‐93
‐93
‐88
‐85
‐84
Bluetooth
Spefication
‐70
Unit
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
TBD
Table 12: Receiver sensitivity
3.6 Current Consumption
Opearation mode
Stand‐by, page mode 0
TX 3DH5
TX 2DH5
TX 3DH3
TX 2DH3
TX 2DH1
TX DH5
TX DH1
RX
Deep sleep
Inquiry
Peak (mA)
‐
100.5
99.3
98.1
98.1
98.7
164
166
56.8
169.3
AVG (mA)
2.1
77.6
77.6
71.1
71.2
51.6
120
67.3
52.6
0.36
58.7
Table 13: Current consumption
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Page 14 of 43
3.7 Antenna Specification
WT41-E is designed and qualified to be used with a 2.14 dBi dipole antenna. Any dipole antenna with the
same or less gain can be used with WT41-E as far as the technical information of the antenna is provided for
Bluegiga for approval. Any antenna approved by Bluegiga can be used with WT41-E without additional
applications to FCC or IC. Table 20 on page 42 lists the antennas pre-approved by Bluegiga. Using an
antenna of a different type (i.e. different radiation pattern) or higher gain will require a permissive change for
the certifications. Please contact support@bluegiga.com for details
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Page 15 of 43
Physical Dimensions
Figure 4: Physical dimensions (top view)
Figure 5: Dimensions for the RF pin (top view)
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Page 16 of 43
25.3 mm
3.35 mm
35.3 mm
11.4 mm
14.0 mm
32.6 mm
Figure 6: Dimensions of WT41-E
Figure 7: Recommended land pattern
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Page 17 of 43
4 Layout Guidelines
Use good layout practices to avoid excessive noise coupling to supply voltage traces or sensitive analog
signal traces, such as analog audio signals. If using overlapping ground planes use stitching vias separated
by max 3 mm to avoid emission from the edges of the PCB. Connect all the GND pins directly to a solid GND
plane and make sure that there is a low impedance path for the return current following the signal and supply
traces all the way from start to the end.
A good practice is to dedicate one of the inner layers to a solid GND plane and one of the inner layers to
supply voltage planes and traces and route all the signals on top and bottom layers of the PCB. This
arrangement will make sure that any return current follows the forward current as close as possible and any
loops are minimized.
Signals
GND
Power
Signals
Figure 8: Typical 4-layer PCB construction
Overlapping GND layers without
GND stitching vias
Overlapping GND layers with
GND stitching vias shielding the
RF energy
Figure 9: Use of stitching vias to avoid emissions from the edges of the PCB
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Page 18 of 43
5 UART Interface
This is a standard UART interface for communicating with other serial devices.WT41-E UART interface
provides a simple mechanism for communicating with other serial devices using the RS232 protocol.
Four signals are used to implement the UART function. When WT41-E is connected to another digital device,
UART_RX and UART_TX transfer data between the two devices. The remaining two signals, UART_CTS and
UART_RTS, can be used to implement RS232 hardware flow control where both are active low indicators. All
UART connections are implemented using CMOS technology and have signalling levels of 0V and VDD.
UART configuration parameters, such as data rate and packet format, are set using WT41-E software.
Note:
In order to communicate with the UART at its maximum data rate using a standard PC, an accelerated serial
port adapter card is required for the PC.
Table 14: Possible UART Settings
The UART interface is capable of resetting WT41-E upon reception of a break signal. A break is identified by a
continuous logic low (0V) on the UART_RX terminal, as shown in Figure 10. If tBRK is longer than the value,
defined by PSKEY_HOST_IO_UART_RESET_TIMEOUT, (0x1a4), a reset will occur. This feature allows a
host to initialise the system to a known state. Also, WT41-E can emit a break character that may be used to
wake the host.
Figure 10: Break Signal
Table 17 shows a list of commonly used data rates and their associated values for
PSKEY_UART_BAUD_RATE (0x204). There is no requirement to use these standard values. Any data rate
within the supported range can be set in the PS Key according to the formula in Equation XXX
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Page 19 of 43
Equation 1: Data Rate
Table 15: Standard Data Rates
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Page 20 of 43
5.1 UART Bypass
Figure 11: UART Bypass Architecture
5.2 UART Configuration While Reset is Active
The UART interface for WT41-E while the chip is being held in reset is tristate. This will allow the user to daisy
chain devices onto the physical UART bus. The constraint on this method is that any devices connected to
this bus must tristate when WT41-E reset is de-asserted and the firmware begins to run.
5.3 UART Bypass Mode
Alternatively, for devices that do not tristate the UART bus, the UART bypass mode on BlueCore4-External
can be used. The default state of BlueCore4-External after reset is de-asserted; this is for the host UART bus
to be connected to the BlueCore4-External UART, thereby allowing communication to BlueCore4-External via
the UART. All UART bypass mode connections are implemented using CMOS technology and have signalling
levels of 0V and VDD.
In order to apply the UART bypass mode, a BCCMD command will be issued to BlueCore4-External. Upon
this issue, it will switch the bypass to PIO[7:4] as Figure 11 indicates. Once the bypass mode has been
invoked, WT41-E will enter the Deep Sleep state indefinitely.
In order to re-establish communication with WT41-E, the chip must be reset so that the default configuration
takes effect.
It is important for the host to ensure a clean Bluetooth disconnection of any active links before the bypass
mode is invoked. Therefore, it is not possible to have active Bluetooth links while operating the bypass mode.
The current consumption for a device in UART bypass mode is equal to the values quoted for a device in
standby mode.
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Page 21 of 43
6 USB Interface
This is a full speed (12Mbits/s) USB interface for communicating with other compatible digital devices. WT41E acts as a USB peripheral, responding to requests from a master host controller such as a PC.
The USB interface is capable of driving a USB cable directly. No external USB transceiver is required. The
device operates as a USB peripheral, responding to requests from a master host controller such as a PC.
Both the OHCI and the UHCI standards are supported. The set of USB endpoints implemented can behave as
specified in the USB section of the Bluetooth v2.1 + EDR specification or alternatively can appear as a set of
endpoints appropriate to USB audio devices such as speakers.
As USB is a master/slave oriented system (in common with other USB peripherals), WT41-E only supports
USB Slave operation.
6.1 USB Data Connections
The USB data lines emerge as pins USB_DP and USB_DN. These terminals are connected to the internal
USB I/O buffers of the BlueCore4-External, therefore, have a low output impedance. To match the connection
to the characteristic impedance of the USB cable, resistors must be placed in series with USB_DP/USB_DN
and the cable.
6.2 USB Pull-Up resistor
WT41-E features an internal USB pull-up resistor. This pulls the USB_DP pin weakly high when WT41-E is
ready to enumerate. It signals to the PC that it is a full speed (12Mbits/s) USB device.
The USB internal pull-up is implemented as a current source, and is compliant with section 7.1.5 of the USB
specification v1.2. The internal pull-up pulls USB_DP high to at least 2.8V when loaded with a 15k 5% pulldown resistor (in the hub/host) when VDD_PADS = 3.1V. This presents a Thevenin resistance to the host of
at least 900. Alternatively, an external 1.5k pull-up resistor can be placed between a PIO line and D+ on the
USB cable. The firmware must be alerted to which mode is used by setting PSKEY_USB_PIO_PULLUP
appropriately. The default setting uses the internal pull-up resistor.
6.3 USB Power Supply
The USB specification dictates that the minimum output high voltage for USB data lines is 2.8V. To safely
meet the USB specification, the voltage on the VDD supply terminal must be an absolute minimum of 3.1V.
Bluegiga recommends 3.3V for optimal USB signal quality.
6.4 Self-Powered Mode
In self-powered mode, the circuit is powered from its own power supply and not from the VBUS (5V) line of the
USB cable. It draws only a small leakage current (below 0.5mA) from VBUS on the USB cable. This is the
easier mode for which to design, as the design is not limited by the power that can be drawn from the USB
hub or root port. However, it requires that VBUS be connected to WT41-E via a resistor network (Rvb1 and
Rvb2), so WT41-E can detect when VBUS is powered up. BlueCore4-External will not pull USB_DP high
when VBUS is off.
Self-powered USB designs (powered from a battery or PSU) must ensure that a PIO line is allocated for USB
pullup purposes. A 1.5k 5% pull-up resistor between USB_DP and the selected PIO line should be fitted to the
design. Failure to fit this resistor may result in the design failing to be USB compliant in self-powered mode.
The internal pull-up in BlueCore is only suitable for bus-powered USB devices, e.g., dongles.
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Page 22 of 43
Figure 12: USB Connections for Self-Powered Mode
The terminal marked USB_ON can be any free PIO pin. The PIO pin selected must be registered by setting
PSKEY_USB_PIO_VBUS to the corresponding pin number.
Figure 13: USB Interface Component Values
6.5 Bus-Powered Mode
In bus-powered mode, the application circuit draws its current from the 5V VBUS supply on the USB cable.
WT41-E negotiates with the PC during the USB enumeration stage about how much current it is allowed to
consume. On power-up the device must not draw more than 100 mA but after being configured it can draw up
to 500 mA.
For WT41-E, the USB power descriptor should be altered to reflect the amount of power required. This is
accomplished by setting PSKEY_USB_MAX_POWER (0x2c6). This is higher than for a Class 2 application
due to the extra current drawn by the Transmit RF PA. By default for WT41-E the setting is 300 mA.
When selecting a regulator, be aware that VBUS may go as low as 4.4V. The inrush current (when charging
reservoir and supply decoupling capacitors) is limited by the USB specification. See the USB Specification.
Some applications may require soft start circuitry to limit inrush current if more than 10uF is present between
VBUS and GND. The 5V VBUS line emerging from a PC is often electrically noisy. As well as regulation down
to 3.3V and 1.8V, applications should include careful filtering of the 5V line to attenuate noise that is above the
voltage regulator bandwidth. Excessive noise on WT41-E supply pins will result in reduced receiver sensitivity
and a distorted RF transmit signal.
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Figure 14: USB Connections for Bus-Powered Mode
6.6 USB Suspend Current
All USB devices must permit the USB controller to place them in a USB suspend mode. While in USB
Suspend, bus-powered devices must not draw more than 2.5mA from USB VBUS (self-powered devices may
draw more than 2.5mA from their own supply). This current draw requirement prevents operation of the radio
by bus-powered devices during USB Suspend.
When computing suspend current, the current from VBUS through the bus pull-up and pull-down resistors
must be included. The pull-up resistor at the device is 1.5 k. (nominal). The pull-down resistor at the hub is
14.25k. to 24.80k. The pull-up voltage is nominally 3.3V, which means that holding one of the signal lines high
takes approximately 200uA, leaving only 2.3mA available from a 2.5mA budget. Ensure that external LEDs
and/or amplifiers can be turned off by BlueCore4-External. The entire circuit must be able to enter the
suspend mode.
6.7 USB Detach and Wake-Up Signaling
WT41-E can provide out-of-band signaling to a host controller by using the control lines called USB_DETACH
and USB_WAKE_UP. These are outside the USB specification (no wires exist for them inside the USB cable),
but can be useful when embedding WT41-E into a circuit where no external USB is visible to the user. Both
control lines are shared with PIO pins and can be assigned to any PIO pin by setting
PSKEY_USB_PIO_DETACH and PSKEY_USB_PIO_WAKEUP to the selected PIO number.
USB_DETACH is an input which, when asserted high, causes WT41-E to put USB_DN and USB_DP in high
impedance state and turns off the pull-up resistor on DP. This detaches the device from the bus and is
logically equivalent to unplugging the device. When USB_DETACH is taken low, WT41-E will connect back to
USB and await enumeration by the USB host.
USB_WAKE_UP is an active high output (used only when USB_DETACH is active) to wake up the host and
allow USB communication to recommence. It replaces the function of the software USB WAKE_UP message
(which runs over the USB cable) and cannot be sent while BlueCore4-External is effectively disconnected
from the bus.
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Figure 15: USB_Detach and USB_Wake_Up Signals
6.8 USB Driver
A USB Bluetooth device driver is required to provide a software interface between BlueCore4-External and
Bluetooth software running on the host computer. Please, contact support@bluegiga.com for suitable drivers.
6.9 USB v2.0 Compliance and Compatibility
Although WT41-E meets the USB specification, CSR cannot guarantee that an application circuit designed
around the module is USB compliant. The choice of application circuit, component choice and PCB layout all
affect USB signal quality and electrical characteristics. The information in this document is intended as a guide
and should be read in association with the USB specification, with particular attention being given to Chapter
7. Independent USB qualification must be sought before an application is deemed USB compliant and can
bear the USB logo. Such qualification can be obtained from a USB plugfest or from an independent USB test
house.
Terminals USB_DP and USB_DN adhere to the USB Specification v2.0 (Chapter 7) electrical requirements.
BlueCore4-External is compatible with USB v2.0 host controllers; under these circumstances the two ends
agree the mutually acceptable rate of 12Mbits/s according to the USB v2.0 specification.
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7 Serial Peripheral Interface (SPI)
The SPI port can be used for system debugging. It can also be used for programming the Flash memory and
setting the PSKEY configurations. WT41-E uses 16-bit data and 16-bit address serial peripheral interface,
where transactions may occur when the internal processor is running or is stopped. SPI interface is connected
using the MOSI, MISO, CSB and CLK pins. Please, contact support@bluegiga.com for detailed information
about the instruction cycle.
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8 PCM Codec Interface
PCM is a standard method used to digitize audio (particularly voice) for transmission over digital
communication channels. Through its PCM interface, WT41-E has hardware support for continual
transmission and reception of PCM data, thus reducing processor overhead for wireless headset applications.
WT41-E offers a bidirectional digital audio interface that routes directly into the baseband layer of the on-chip
firmware. It does not pass through the HCI protocol layer.
Hardware on WT41-E allows the data to be sent to and received from a SCO connection. Up to three SCO
connections can be supported by the PCM interface at any one time.
WT41-E can operate as the PCM interface master generating an output clock of 128, 256 or 512kHz. When
configured as PCM interface slave, it can operate with an input clock up to 2048kHz. WT41-E is compatible
with a variety of clock formats, including Long Frame Sync, Short Frame Sync and GCI timing environments.
It supports 13-bit or 16-bit linear, 8-bit µ-law or A-law companded sample formats at 8ksamples/s and can
receive and transmit on any selection of three of the first four slots following PCM_SYNC. The PCM
configuration options are enabled by setting PSKEY_PCM_CONFIG32.
WT41-E interfaces directly to PCM audio devices.
NOTE: Analog audio lines are very sensitive to RF disturbance. Use good layout practices to ensure noise
less audio. Make sure that the return path for the audio signals follows the forward current all the way as close
as possible and use fully differential signals when possible. Do not compromise audio routing.
8.1 PCM Interface Master/Slave
When configured as the master of the PCM interface, WT41-E generates PCM_CLK and PCM_SYNC.
Figure 16: PCM Interface Master
When configured as the Slave of the PCM interface, WT41-E accepts PCM_CLK rates up to 2048kHz.
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Figure 17: PCM Interface Slave
8.2 Long Frame Sync
Long Frame Sync is the name given to a clocking format that controls the transfer of PCM data words or
samples. In Long Frame Sync, the rising edge of PCM_SYNC indicates the start of the PCM word. When
WT41-E is configured as PCM master, generating PCM_SYNC and PCM_CLK, then PCM_SYNC is 8-bits
long. When WT41-E is configured as PCM Slave, PCM_SYNC may be from two consecutive falling edges of
PCM_CLK to half the PCM_SYNC rate, i.e., 62.5s long.
Figure 18: Long Frame Sync (Shown with 8-bit Companded Sample)
WT41-E samples PCM_IN on the falling edge of PCM_CLK and transmits PCM_OUT on the rising edge.
PCM_OUT may be configured to be high impedance on the falling edge of PCM_CLK in the LSB position or
on the rising edge.
8.3 Short Frame Sync
In Short Frame Sync, the falling edge of PCM_SYNC indicates the start of the PCM word. PCM_SYNC is
always one clock cycle long.
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Figure 19: Short Frame Sync (Shown with 16-bit Sample)
As with Long Frame Sync, WT41-E samples PCM_IN on the falling edge of PCM_CLK and transmits
PCM_OUT on the rising edge. PCM_OUT may be configured to be high impedance on the falling edge of
PCM_CLK in the LSB position or on the rising edge.
8.4 Multi-slot Operation
More than one SCO connection over the PCM interface is supported using multiple slots. Up to three SCO
connections can be carried over any of the first four slots.
Figure 20: Multi-slot Operation with Two Slots and 8-bit Companded Samples
8.5 GCI Interface
WT41-E is compatible with the GCI, a standard synchronous 2B+D ISDN timing interface. The two 64kbits/s B
channels can be accessed when this mode is configured.
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Figure 21: GCI Interface
The start of frame is indicated by the rising edge of PCM_SYNC and runs at 8kHz. With WT41-E in Slave
mode, the frequency of PCM_CLK can be up to 4.096MHz.
8.6 Slots and Sample Formats
WT41-E can receive and transmit on any selection of the first four slots following each sync pulse. Slot
durations can be either 8 or 16 clock cycles. Durations of 8 clock cycles may only be used with 8-bit sample
formats. Durations of 16 clocks may be used with 8-bit, 13-bit or 16-bit sample formats.
WT41-E supports 13-bit linear, 16-bit linear and 8-bit -law or A-law sample formats. The sample rate is
8ksamples/s. The bit order may be little or big endian. When 16-bit slots are used, the 3 or 8 unused bits in
each slot may be filled with sign extension, padded with zeros or a programmable 3-bit audio attenuation
compatible with some Motorola codecs.
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Figure 22: 16-bit Slot Length and Sample Formats
8.7 Additional Features
WT41-E has a mute facility that forces PCM_OUT to be 0. In master mode, PCM_SYNC may also be forced
to 0 while keeping PCM_CLK running which some codecs use to control power down.
8.8 PCM_CLK and PCM_SYNC Generation
WT41-E has two methods of generating PCM_CLK and PCM_SYNC in master mode. The first is generating
these signals by DDS from BlueCore4-External internal 4MHz clock. Using this mode limits PCM_CLK to 128,
256 or 512kHz and PCM_SYNC to 8kHz. The second is generating PCM_CLK and PCM_SYNC by DDS from
an internal 48MHz clock (which allows a greater range of frequencies to be generated with low jitter but
consumes more power). This second method is selected by setting bit 48M_PCM_CLK_GEN_EN in
PSKEY_PCM_CONFIG32. When in this mode and with long frame sync, the length of PCM_SYNC can be
either 8 or 16 cycles of PCM_CLK, determined by LONG_LENGTH_SYNC_EN in PSKEY_PCM_CONFIG32.
The Equation XXX describes PCM_CLK frequency when being generated using the internal 48MHz clock:
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Equation 2: PCM_CLK Frequency When Being Generated Using the Internal 48MHz Clock
The frequency of PCM_SYNC relative to PCM_CLK can be set using Equation XXX:
Equation 3: PCM_SYNC Frequency Relative to PCM_CLK
CNT_RATE, CNT_LIMIT and SYNC_LIMIT are set using PSKEY_PCM_LOW_JITTER_CONFIG. As an
example,
to
generate
PCM_CLK
at
512kHz
with
PCM_SYNC
at
8kHz,
set
PSKEY_PCM_LOW_JITTER_CONFIG to 0x08080177.
8.9 PCM Configuration
The PCM configuration is set using two PS Keys, PSKEY_PCM_CONFIG32 detailed in Table 18 and
PSKEY_PCM_LOW_JITTER_CONFIG in Table 19. The default for PSKEY_PCM_CONFIG32 is 0x00800000,
i.e., first slot following sync is active, 13-bit linear voice format, long frame sync and interface master
generating 256kHz PCM_CLK from 4MHz internal clock with no tri-state of PCM_OUT.
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Name
Bit position
Description
SLAVE MODE EN
SHORT SYNC EN
SIGN EXTENDED
EN
LSB FIRST EN
Set to 0
0 selects Master mode with internal generation of PCM_CLK and
PCM_SYNC. 1 selects Slave mode requiring externally generated
PCM_CLK and PCM_SYNC. This should be set to 1 if
48M_PCM_CLK_GEN_EN (bit 11) is set.
0 selects long frame sync (rising edge indicates start of frame), 1
selects short frame sync (falling edge indicates start of frame).
Set to 0
0 selects padding of 8 or 13-bit voice sample into a 16- bit slot by
inserting extra LSBs, 1 selects sign extension. W hen padding is
selected with 3-bit voice sample, the 3 padding bits are the audio gain
setting; with 8-bit samples the 8 padding bits are zeroes.
0 transmits and receives voice samples MSB first, 1 uses LSB first.
TX TRISTATE EN
0 drives PCM_OUT continuously, 1 tri-states PCM_OUT immediately
after the falling edge of PCM_CLK in the last bit of an active slot,
assuming the next slot is not active.
TX TRISTATE
RISING EDGE EN
0 tristates PCM_OUT immediately after the falling edge of PCM_CLK
in the last bit of an active slot, assuming the next slot is also not active.
1 tristates PCM_OUT after the rising edge of PCM_CLK.
SYNC SUPPRESS
EN
GCI MODE EN
MUTE EN
10
48M PCM CLK GEN
EN
11
LONG LENGTH
SYNC EN
12
0 sets PCM_SYNC length to 8 PCM_CLK cycles and 1 sets length to
16 PCM_CLK cycles. Only applies for long frame sync and with
48M_PCM_CLK_GEN_EN set to 1.
[20:16]
Set to 0b00000.
MASTER CLK RATE
[22:21]
Selects 128 (0b01), 256 (0b00), 512 (0b10) kHz PCM_CLK frequency
when master and 48M_PCM_CLK_GEN_EN (bit 11) is low.
ACTIVE SLOT
[26:23]
SAMPLE_FORMAT
[28:27]
0 enables PCM_SYNC output when master, 1 suppresses PCM_SYNC
whilst keeping PCM_CLK running. Some CODECS utilize this to enter
a low power state.
1 enables GCI mode.
1 forces PCM_OUT to 0.
0 sets PCM_CLK and PCM_SYNC generation via DDS from internal 4
MHz clock, as for BlueCore4-External. 1 sets PCM_CLK and
PCM_SYNC generation via DDS from internal 48 MHz clock.
Default is 0001. Ignored by firmaware
Selects between 13 (0b00), 16 (0b01), 8 (0b10) bit sample with 16
cycle slot duration 8 (0b11) bit sample 8 cycle slot duration.
Table 16: PSKEY_PCM_CONFIG32 description
Name
CNT LIMIT
CNT RATE
SYNC LIMIT
Bit position
[12:0]
[23:16]
[31:24]
Description
Sets PCM_CLK counter limit
Sets PCM_CLK count rate.
Sets PCM_SYNC division relative to PCM_CLK.
Table 17: PSKEY_PCM_LOW_JITTER_CONFIG Description
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9 I/O Parallel Ports
Six lines of programmable bidirectional input/outputs (I/O) are provided. All the PIO lines are power from VDD.
PIO lines can be configured through software to have either weak or strong pull-ups or pull-downs. All PIO
lines are configured as inputs with weak pull-downs at reset. Any of the PIO lines can be configured as
interrupt request lines or as wake-up lines from sleep modes.
WT41-E has a general purpose analogue interface pin AIO[1]. This is used to access internal circuitry and
control signals. It may be configured to provide additional functionality.
Auxiliary functions available via AIO[1] include an 8-bit ADC and an 8-bit DAC. Typically the ADC is used for
battery voltage measurement. Signals selectable at this pin include the band gap reference voltage and a
variety of clock signals: 48, 24, 16, 8MHz and the XTAL clock frequency. When used with analogue signals,
the voltage range is constrained by the analogue supply voltage internally to the module (1.8V). When
configured to drive out digital level signals (e.g., clocks), the output voltage level is determined by VDD.
9.1 PIO Defaults
Bluegiga cannot guarantee that these terminal functions remain the same. Refer to the software release note
for the implementation of these PIO lines, as they are firmware build-specific.
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10 Reset
WT41-E may be reset from several sources: RESET pin, power on reset, a UART break character or via
software configured watchdog timer. The RESET pin is an active low reset and is internally filtered using the
internal low frequency clock oscillator. A reset will be performed between 1.5 and 4.0ms following RESETB
being active. It is recommended that RESET be applied for a period greater than 5ms.
The power on reset occurs when the VDD_CORE supply internally to the module falls below typically 1.5V
and is released when VDD_CORE rises above typically 1.6V. At reset the digital I/O pins are set to inputs for
bidirectional pins and outputs are tri-state.
The reset should be held active at power up until all the supply voltages have stabilized to ensure correct
operation of the internal flash memory. Following figure shows an example of a simple power up reset circuit.
Time constant of the RC circuitry is set so that the supply voltage is safely stabilized before the reset
deactivates.
Figure 23: Example of a simple power on reset circuit.
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10.1 Pin States on Reset
PIN NAME
PIO[7:2]
PCM_OUT
PCM_IN
PCM_SYNC
PCM_CLK
UART_TX
UART_RX
UART_RTS
UART_CTS
USB+
USBSPI_CSB
SPI_CLK
SPI_MOSI
SPI_MISO
AIO[1]
STATE
Input with weak pull-down
Tri-staed with weak pull-down
Input with weak pull-down
Input with weak pull-down
Input with weak pull-down
Output tristated with weak pull-up
Input with weak pull-down
Output tristated with weak pull-up
Input with weak pull-down
Input with weak pull-down
Input with weak pull-down
Input with weak pull-down
Input with weak pull-down
Input with weak pull-down
Output tristated with weak pull-down
Output, driving low
Table 18: Pin States on Reset
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11 Certifications
WT41-E is compliant to the following specifications.
11.1 Bluetooth
WT41-E module is Bluetooth qualified and listed as a controller subsystem and it is Bluetooth compliant to the
following profiles of the core spec version 2.1/2.1+EDR.

Baseband

HCI

Link Manager

Radio
The radio has been tested using maximum antenna gain of 2.3 dBi and the Bluetooth qualification is valid for
any antenna with the same or less gain.
11.2 FCC and IC
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may
cause undesired operation.
FCC RF Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. End
users must follow the specific operating instructions for satisfying RF exposure compliance. This transmitter
must not be co-located or operating in conjunction with any other antenna or transmitter. This transmitter is
considered as mobile device and should not be used closer than 20 cm from a human body. To allow portable
use in a known host class 2 permissive change is required. Please contact support@bluegiga.com for detailed
information.
IC Statements:
This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the
following two conditions: (1) this device may not cause interference, and (2) this device must accept any
interference, including interference that may cause undesired operation of the device.
Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and
maximum (or lesser) gain approved for the transmitter by Industry Canada. To reduce potential radio
interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically
radiated power (e.i.r.p.) is not more than that necessary for successful communication.
If detachable antennas are used:
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This radio transmitter (identify the device by certification number, or model number ifCategory II) has been
approved by Industry Canada to operate with the antenna types listed below with the maximum permissible
gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list,
having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this
device. See table 19 for the approved antennas for WT41-E.
OEM Responsibilities to comply with FCC and Industry Canada Regulations
The WT41-E Module has been certified for integration into products only by OEM integrators under the
following conditions:

The antenna(s) must be installed such that a minimum separation distance of 20cm is maintained
between the radiator (antenna) and all persons at all times.

The transmitter module must not be co-located or operating in conjunction with any other antenna or
transmitter.
As long as the two conditions above are met, further transmitter testing will not be required. However, the
OEM integrator is still responsible for testing their end-product for any additional compliance requirements
required with this module installed (for example, digital device emissions, PC peripheral requirements, etc.).
IMPORTANT NOTE: In the event that these conditions can not be met (for certain configurations or colocation with another transmitter), then the FCC and Industry Canada authorizations are no longer considered
valid and the FCC ID and IC Certification Number can not be used on the final product. In these
circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the
transmitter) and obtaining a separate FCC and Industry Canada authorization.
End Product Labeling
The WT41-E Module is labeled with its own FCC ID and IC Certification Number. If the FCC ID and IC
Certification Number are not visible when the module is installed inside another device, then the outside of the
device into which the module is installed must also display a label referring to the enclosed module. In that
case, the final end product must be labeled in a visible area with the following:
“Contains Transmitter Module FCC ID: QOQWT41E”
“Contains Transmitter Module IC: 5123A-BGTWT41E”
or
“Contains FCC ID: QOQWT41E
“Contains IC: 5123A-BGTWT41E”
The OEM of the WT41-E Module must only use the approved antenna(s) described in table 19, which have
been certified with this module.
The OEM integrator has to be aware not to provide information to the end user regarding how to install or
remove this RF module or change RF related parameters in the user manual of the end product.
To comply with FCC and Industry Canada RF radiation exposure limits for general population, the
antenna(s) used for this transmitter must be installed such that a minimum separation distance of
20cm is maintained between the radiator (antenna) and all persons at all times and must not be colocated or operating in conjunction with any other antenna or transmitter.
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11.2.1 FCC et IC
Cet appareil est conforme à l’alinéa 15 des règles de la FCC. Deux conditions sont à respecter lors de
son utilisation :
(1) cet appareil ne doit pas créer d’interférence susceptible de causer un quelconque dommage et,
(2) cet appareil doit accepter toute interférence, quelle qu’elle soit, y compris les interférences
susceptibles d’entraîner un fonctionnement non requis.
Déclaration de conformité FCC d’exposition aux radiofréquences (RF):
Ce matériel respecte les limites d’exposition aux radiofréquences fixées par la FCC dans un environnement
non contrôlé. Les utilisateurs finaux doivent se conformer aux instructions d’utilisation spécifiées afin de
satisfaire aux normes d’exposition en matière de radiofréquence. Ce transmetteur ne doit pas être installé ni
utilisé en concomitance avec une autre antenne ou un autre transmetteur. Ce transmetteur est assimilé à un
appareil mobile et ne doit pas être utilisé à moins de 20 cm du corps humain. Afin de permettre un usage
mobile dans le cadre d’un matériel de catégorie 2, il est nécessaire de procéder à quelques adaptations. Pour
des informations détaillées, veuillez contacter le support technique Bluegiga : support@bluegiga.com.
Déclaration de conformité IC :
Ce matériel respecte les standards RSS exempt de licence d’Industrie Canada. Son utilisation est soumise
aux deux conditions suivantes :
(1) l’appareil ne doit causer aucune interférence, et
(2) l’appareil doit accepter toute interférence, quelle qu’elle soit, y compris les interférences
susceptibles d’entraîner un fonctionnement non requis de l’appareil.
Selon la réglementation d’Industrie Canada, ce radio-transmetteur ne peut utiliser qu’un seul type d’antenne
et ne doit pas dépasser la limite de gain autorisée par Industrie Canada pour les transmetteurs. Afin de
réduire les interférences potentielles avec d’autres utilisateurs, le type d’antenne et son gain devront être
définis de telle façon que la puissance isotrope rayonnante équivalente (EIRP) soit juste suffisante pour
permettre une bonne communication.
Lors de l’utilisation d’antennes amovibles :
Ce radio-transmetteur (identifié par un numéro certifié ou un numéro de modèle dans le cas de la catégorie II)
a été approuvé par Industrie Canada pour fonctionner avec les antennes référencées ci-dessous dans la
limite de gain acceptable et l’impédance requise pour chaque type d’antenne cité. Les antennes non
référencées possédant un gain supérieur au gain maximum autorisé pour le type d’antenne auquel elles
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appartiennent sont strictement interdites d’utilisation avec ce matériel. Veuillez vous référer au tableau 19
concernant les antennes approuvées pour les WT41-E.
Les responsabilités de l’intégrateur afin de satisfaire aux réglementations de la FCC et d’Industrie
Canada :
Les modules WT41-E ont été certifiés pour entrer dans la fabrication de produits exclusivement réalisés par
des intégrateurs dans les conditions suivantes :

L’antenne (ou les antennes) doit être installée de façon à maintenir à tout instant une distance
minimum de 20cm entre la source de radiation (l’antenne) et toute personne physique.

Le module transmetteur ne doit pas être installé ou utilisé en concomitance avec une autre antenne
ou un autre transmetteur.
Tant que ces deux conditions sont réunies, il n’est pas nécessaire de procéder à des tests supplémentaires
sur le transmetteur. Cependant, l’intégrateur est responsable des tests effectués sur le produit final afin de se
mettre en conformité avec d’éventuelles exigences complémentaires lorsque le module est installé (exemple :
émissions provenant d’appareils numériques, exigences vis-à-vis de périphériques informatiques, etc.) ;
IMPORTANT : Dans le cas où ces conditions ne peuvent être satisfaites (pour certaines configurations ou
installation avec un autre transmetteur), les autorisations fournies par la FCC et Industrie Canada ne sont plus
valables et les numéros d’identification de la FCC et de certification d’Industrie Canada ne peuvent servir pour
le produit final. Dans ces circonstances, il incombera à l’intégrateur de faire réévaluer le produit final
(comprenant le transmetteur) et d’obtenir une autorisation séparée de la part de la FCC et d’Industrie Canada.
Etiquetage du produit final
Chaque module WT41-E possède sa propre identification FCC et son propre numéro de certification IC. Si
l’identification FCC et le numéro de certification IC ne sont pas visibles lorsqu’un module est installé à
l’intérieur d’un autre appareil, alors l’appareil en question devra lui aussi présenter une étiquette faisant
référence au module inclus. Dans ce cas, le produit final doit comporter une étiquette placée de façon visible
affichant les mentions suivantes :
« Contient un module transmetteur certifié FCC QOQWT41E »
« Contient un module transmetteur certifié IC 5123A-BGTWT41E »
ou
« Inclut la certification FCC QOQWT41E »
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« Inclut la certification IC 5123A-BGTWT41E »
L’intégrateur du module WT41-E ne doit utiliser que les antennes répertoriées dans le tableau 19 certifiées
pour ce module.
L’intégrateur est tenu de ne fournir aucune information à l’utilisateur final autorisant ce dernier à installer ou
retirer le module RF, ou bien changer les paramètres RF du module, dans le manuel d’utilisation du produit
final.
Afin de se conformer aux limites de radiation imposées par la FCC et Industry Canada, l’antenne (ou
les antennes) utilisée pour ce transmetteur doit être installée de telle sorte à maintenir une distance
minimum de 20cm à tout instant entre la source de radiation (l’antenne) et les personnes physiques.
En outre, cette antenne ne devra en aucun cas être installée ou utilisée en concomitance avec une
autre antenne ou un autre transmetteur.
11.3 CE
WT41-E meets the requirements of the standards below and hence fulfills the requirements of EMC Directive
89/336/EEC as amended by Directives 92/31/EEC and 93/68/EEC within CE marking requirement.

EMC (immunity only) EN 301 489-17 V.1.3.3 in accordance with EN 301 489-1 V1.8.1

Radiated emissions EN 300 328 V1.7.1
11.4 Japan
According to Japanese regulations the OEM integrator using a surface mountable module, such as WT41-E,
will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate
authorization for the radio. WT41-E is tested to meet the technical requirements of a radio for Japanese
market. Japan’s regulations limit the maximum spectral power density to 3mW/MHz. When using AFH the
number of active channels can be as low as 20, which will effectively increase the spectral power density.
Thus when AFH is in use the transmit power must be decreased nominally below 17 dBm to meet Japan
regulations.
11.5 Qualified Antenna Types for WT41-E
This device has been designed to operate with a standard 2.14 dBi dipole antenna. Any antenna of a different
type or with a gain higher than 2.14 dBi is strictly prohibited for use with this device. Using an antenna of a
different type or gain more than 2.14 dBi will require additional testing for FCC, CE and IC. Please, contact
support@bluegiga.com for more information. The required antenna impedance is 50 ohms.
Bluegiga Technologies Oy
Page 41 of 43
Qualified Antenna Types for WT41-E
Antenna Type
Maximum Gain
Dipole
2.14 dBi
Table 19: Qualified Antenna Types for WT41-E
To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that
the equivalent isotropically radiated power (e.i.r.p.) is not more than that permitted for successful
communication.
Any standard 2.14 dBi dipole antenna can be used without an additional application to FCC. Table 20 lists
approved antennas for WT41-E. Any approved antenna listed in table 20 can be used directly with WT41-E
without any additional approval. Any antenna not listed in table 20 can be used with WT41-E as long as
detailed information from that particular antenna is provided to Bluegiga for approval. Specification of each
antenna used with WT41-E will be filed by Bluegiga. Please, contact support@bluegiga.com for more
information.
Item
Manufacturer
Pulse
Linx Technologies Inc
EAD
Antenova
Litecon
Manufacturers part number
W1030
ANT‐2.4‐CW‐CT‐SMA
EA‐79A
B4844/B6090
CAR‐ATR‐187‐001
Measure
d Gain
(dBi)
1.3
0.4
1.4
0.8
Specifie
d Gain
(dBi)
2 dBi
2 dBi
2 dBi
2 dBi
2 dBi
Measure Total
Efficiency (%)
70 ‐ 80
77
60
76 ‐ 82
60 ‐ 70
Table 20: Approved Antennas For WT41-E
Bluegiga Technologies Oy
Page 42 of 43
12 Contact Information
Sales:
sales@bluegiga.com
Technical support:
support@bluegiga.com
http://www.bluegiga.com/techforum/
Orders:
orders@bluegiga.com
Head Office / Finland:
Phone: +358-9-4355 060
Fax: +358-9-4355 0660
Street Address:
Sinikalliontie 5A
02630 ESPOO
FINLAND
Postal address:
P.O. BOX 120
02631 ESPOO
FINLAND
Sales Office / USA:
Phone: (781) 556-1039
Bluegiga Technologies, Inc.
99 Derby Street, Suite 200 Hingham, MA 02043
Bluegiga Technologies Oy
Page 43 of 43

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