Silicon Laboratories Finland WT41 Data Sheet
WT41-A / WT41-N
DATA SHEET
Tuesday, 14 May 2013
Version 1.37
Copyright © 2000-2013 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.
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VERSION HISTORY
Version
Comment
0.1
First draft
0.2
Description and product codes added
0.21
Dimensions updated, layout guide added, UART and USB chapters added
0.22
Pin descriptions, PCM, USB, UART, SPI
0.3
Physical dimensions corrected
0.31
Product codes corrected
0.32
Recommendation for a power-up reset circuitry added to chapter 10
0.4
Pins 1 and 52 (GND) removed. Dimensions updated, recommended land
pattern added
0.5
Certification information added
0.6
Physical dimensions and recommended PCB land pattern updated
0.7
Figure 5 recommended land pattern corrected
1.0
Radio and antenna characteristics, layout guide for WT41-N
1.1
Japan certification info added
1.2
FCC RF radiation exposure statement updated
1.3
Layout guide updated
1.31
VDD added to table 1
1.32
FCC and IC statements updated
1.33
PIO current drive capability added. List of approved antennas added.
1.34
IC statements in French added
1.35
Information about Japan compliance updated
1.36
Absolute maximum supply voltage 3.7V
1.37
MIC Japan information updated
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1.4
FCC C2PC to remove 20 cm restriction
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TABLE OF CONTENTS
1 Ordering Information......................................................................................................................................8
2 Pinout and Terminal Description ...................................................................................................................9
3 Electrical Characteristics ............................................................................................................................ 12
3.1 Absolute Maximum Ratings ................................................................................................................ 12
3.2 Recommended Operating Conditions ................................................................................................. 12
3.3 PIO Current Sink and Source Capability ............................................................................................. 12
3.4 Transmitter Performance For BDR ..................................................................................................... 13
3.5 Radiated Spurious Emissions ............................................................................................................. 14
3.6 Receiver Performance ........................................................................................................................ 15
3.7 Current Consumption .......................................................................................................................... 15
3.8 Antenna Performance and Radiation Patterns ................................................................................... 16
4 Physical Dimensions .................................................................................................................................. 20
5 Layout Guidelines ....................................................................................................................................... 22
5.1 WT41-A ............................................................................................................................................... 22
5.2 WT41-N ............................................................................................................................................... 23
5.2.1 Layout for WT41-N with u.fl connector close to RF pin ............................................................... 23
5.2.2 Layout for WT41-N with 50 ohm trace from RF pin to a SMA connector .................................... 23
6 UART Interface ........................................................................................................................................... 25
6.1 UART Bypass ...................................................................................................................................... 27
6.2 UART Configuration While Reset is Active ......................................................................................... 27
6.3 UART Bypass Mode ............................................................................................................................ 27
7 USB Interface ............................................................................................................................................. 28
7.1 USB Data Connections ....................................................................................................................... 28
7.2 USB Pull-Up resistor ........................................................................................................................... 28
7.3 USB Power Supply .............................................................................................................................. 28
7.4 Self-Powered Mode ............................................................................................................................. 28
7.5 Bus-Powered Mode ............................................................................................................................. 29
7.6 USB Suspend Current ......................................................................................................................... 30
7.7 USB Detach and Wake-Up Signaling.................................................................................................. 30
7.8 USB Driver .......................................................................................................................................... 31
7.9 USB v2.0 Compliance and Compatibility ............................................................................................ 31
8 Serial Peripheral Interface (SPI) ................................................................................................................. 32
9 PCM Codec Interface ................................................................................................................................. 33
9.1 PCM Interface Master/Slave ............................................................................................................... 33
9.2 Long Frame Sync ................................................................................................................................ 34
9.3 Short Frame Sync ............................................................................................................................... 34
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9.4 Multi-slot Operation ............................................................................................................................. 35
9.5 GCI Interface ....................................................................................................................................... 35
9.6 Slots and Sample Formats .................................................................................................................. 36
9.7 Additional Features ............................................................................................................................. 37
9.8 PCM_CLK and PCM_SYNC Generation ............................................................................................ 37
9.9 PCM Configuration .............................................................................................................................. 38
10 I/O Parallel Ports ..................................................................................................................................... 40
10.1 PIO Defaults ................................................................................................................................. 40
11 Reset ....................................................................................................................................................... 41
11.1 Pin States on Reset ..................................................................................................................... 42
12 Certifications ........................................................................................................................................... 43
12.1 Bluetooth ...................................................................................................................................... 43
12.2 FCC .............................................................................................................................................. 43
12.3 IC (Industry Canada) .................................................................................................................... 44
12.3.1 IC .................................................................................................................................................. 45
12.4 CE ................................................................................................................................................ 47
12.5 Japan ........................................................................................................................................... 47
12.6 Qualified Antenna Types for WT41-N .......................................................................................... 47
13 Contact Information................................................................................................................................. 49
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WT41 Bluetooth® Module
DESCRIPTION
WT41 is a long range class 1, Bluetooth® 2.1 +
EDR module. WT41 is a highly integrated and
sophisticated Bluetooth® module, containing all the
necessary elements from Bluetooth® radio to
antenna and a fully implemented protocol stack.
Therefore WT41 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 is optimized for long range applications and
since it contains a RF power amplifier, low noise
amplifier and a highly efficient chip antenna. With
115 dB radio budget WT41 can reach over 1 km
range in line off sight.
By default WT41 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.
APPLICATIONS:
Hand held terminals
Industrial devices
Point-of-Sale systems
PCs
Personal Digital Assistants (PDAs)
Computer Accessories
Access Points
Automotive Diagnostics Units
FEATURES:
Fully Qualified Bluetooth v2.1 + EDR end
product,
CE, FCC, IC and MIC Japan
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
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1 Ordering Information
Product series
Firmware
HCI = HCI firmware (Bluetooth 2.0 + EDR)
HCI21= HCI firmware (Bluetooth 2.1 + EDR)
HCI30= HCI firmware (Bluetooth 3.0)
AI = iWRAP 2.2.0
AI3 = iWRAP 3.0.0
AI4 = iWRAP 4.0.0
HW version
A = Chip antenna
N = RF pin
WT41-A-HCI
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Page 8 of 49
Pins 1 and 52 (GND)
are not connected
and have been
removed
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
262728
29
51
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
59
5857565554
53
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
RFGND
RF
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
PCM_OUT
PIO4
GND
VDD
RESET
PIO6
PIO7
GND
SPI_CSB
SPI_CLK
SPI_MISO
SPI_MOSI
PIO5
UART_TX
AIO
50
PIN
NUMBER
PAD TYPE DESCRIPTION
NC 1, 52 Not connected
Pins 1 and 52 (GND) have been removed
from the module.
RESET 33
Input, weak internal pull-
up
Active low reset. Keep low for >5 ms
to cause a reset
GND
2-10, 16,
23,24,26-
28, 30,
31,36,44-
GND GND
RF 51 RF output
RF output for WT41-N. For WT41-A
and WT41-E this pin is not connected
RFGND 50 GND
RF ground. Connected to GND internally to
the module.
VDD_PA 11 Supply voltage
Supply voltage for the RF power amplifier
and the low noise amplifier of the module
VDD 32 Supply voltage
Supply voltage for BC4 and the flash
memory
2 Pinout and Terminal Description
Table 1: Supply and RF Terminal Descriptions
Figure 1: WT41 pin out
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Page 9 of 49
PIO PORT
PIN
NUMBER
PAD TYPE 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
SPI
INTERFACE
PIN
NUMBER
PAD TYPE DESCRIPTION
PCM_OUT 25
CMOS output, tri-state,
weak internal pull-down
Synchronous data output
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
UART
Interfaces
PIN
NUMBER
PAD TYPE DESCRIPTION
UART_TX 42
CMOS output, tri-
state, with weak
internal pull-up
UART data output, active high
UART_RTS# 14
CMOS output, tri-
state, with weak
internal pull-up
UART request to send, active low
UART_RX 15
CMOS input, tristate, with weak
internal pull-down
UART data input, active high
UART_CTS# 19
CMOS input, tristate, with weak
internal pull-down
UART clear to send, active low
Table 2: GPIO Terminal Descriptions
Table 3: PCM Terminal Descriptions
Table 4: UART Terminal Descriptions
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Page 10 of 49
USB Interfaces
PIN
NUMBER
PAD TYPE DESCRIPTION
USB+ 17 Bidirectional
USB data plus with selectable internal 1.5k
pull-up resistor
USB- 18 Bidirectional USB data minus
SPI
INTERFACE
PIN
NUMBER
PAD TYPE DESCRIPTION
SPI_MOSI 40
CMOS input with weak
internal pull-down
SPI data input
SPI_CS# 37
CMOS input with weak
internal pull-up
Chip select for Serial Peripheral
Interface, active low
SPI_CLK 38
CMOS input with weak
internal pull-down
SPI clock
SPI_MISO 39
CMOS output, tristate,
with weak internal pull
down
SPI data output
Table 5: USB Terminal Descriptions
Table 6: Terminal Descriptions
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Page 11 of 49
Min Max Unit
-40 85 °C
-0.4 3.7 V
VSS-0.4 VDD+0.4 V
Rating
Storage Temperature
Other Terminal Voltages
VDD_PA, VDD
Min Max Unit
-40 85 °C
3.0 3.6 V
Rating
Operating Temperature Range
VDD_PA, VDD
*)
3 Electrical Characteristics
3.1 Absolute Maximum Ratings
Table 7: Absolute Maximum Ratings
3.2 Recommended Operating Conditions
*) 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 PIO Current Drive Capability
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3.4 Transmitter Performance For BDR
Min Typ Max
Bluetooth
Specification
Unit
17 19 20 20 dBm
4 - dB
1.5 - dB
0.1 1 2 - dB
-10 19
942 1000 kHz
F = F0 ± 2MHz
-20 -20
F = F0 ± 3MHz
-40 -40
F = F0 > 3MHz
-40 -40
7 +/-25 kHz
169 140<175 kHz
161 140<175 kHz
1.1 >=0.8
20dB band width for modulated carrier
ΔF1
maxΔF1avg
RF power variation over supply voltage range (*
RF Characetristics, VDD = 3.3V @ room
temperature unless otherwise specified
Drift rate
ΔF
2avg
/ ΔF
1avg
ACP (1
maximum RF Transmit Power
RF power variation over temperature range
RF power variation over BT band
RF power control range (*
Antenna gain 2.3dBi taken into account
Table 9: Transmitter performance for BDR
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Page 13 of 49
3.5 Radiated Spurious Emissions
Standard Band / Frequency
Min
(AVG /
PEAK)
Typ
(AVG /
PEAK)
Max
(AVG /
PEAK)
Limit by the Standard
(AVG / PEAK)
Unit
2nd harmonic 52 54/58 54 / 74 dBuV/m
3rd harmonic 51 54/58 54 / 74 dBuV/m
Band edge
2390MHz
50/60 52/63
54 / 74 dBuV/m
Band edge
2483.5MHz
52/65 54/67
54 / 74 dBuV/m
Band edge
2400MHz
(conducted)
-50
-20 dBc
Band edge
2483.5MHz
(conducted)
-58 -20 dBc
Band edge
2400MHz
-39 -36 -30
dBm
2nd harmonic -41 -30
dBm
3rd harmonic -41 -30
dBm
(2400 - 2479) MHz -
-47 dBm
(1600 - 1653) MHz -52 -47 dBm
ETSI EN 300 328
transmitter
spurious
emissions
FCC part 15
transmitter
spurious
emissions
ETSI EN 300 328
receiver spurious
Standard
Min
(AVG /
PEAK)
Typ (AVG
/ PEAK)
Max
(AVG /
PEAK)
Limit by the Standard
(AVG / PEAK)
Unit
2nd harmonic <48/55 50/56 54 / 74 dBuV/m
3rd harmonic <48/51 48/52 54 / 74 dBuV/m
Band edge
2390MHz
50/60 52/63
54 / 74 dBuV/m
Band edge
2483.5MHz
52/65 54/67
54 / 74 dBuV/m
Band edge 2400
MHz (conducted)
-50
-20 dBc
Band edge
3483.5MHz
(conducted)
-58 -20
dBc
Band edge
2400MHz
-39 -36 -30
dBm
2nd harmonic -30
dBm
3rd harmonic -30
dBm
(2400 - 2479) MHz
-47 dBm
(1600 - 1653) MHz -47 dBm
ETSI EN 300 328
transmitter
spurious emissions
FCC part 15
transmitter
spurious emissions
ETSI EN 300 328
receiver spurious
Measured from WT41 evaluation board
Table 10:Radiated spurious emission for WT41-A
Table 11: Radiated spurious emission for WT41-N
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3.6 Receiver Performance
RF characteristis, VDD = 3.3V,
room temperature (**
Packet type Min Typ Max
Bluetooth
Spefication
Unit
DH1 -92 -70 dBm
DH3 -92 dBm
DH5 -91 dBm
2-DH1 -94 dBm
2-DH3 -93 dBm
2-DH5 -93 dBm
3-DH1 -88 dBm
3-DH3 -85 dBm
3-DH5 -84 dBm
Sensitivity variation over
temperature range
TBD
Sensitivity for 0.1% BER
Peak (mA) AVG (mA)
- 2.1
100.5 77.6
99.3 77.6
98.1 71.1
98.1 71.2
98.7 51.6
164 120
166 67.3
56.8 52.6
0.36
169.3 58.7
RX
Inquiry
Deep sleep
TX 2DH1
TX DH5
Opearation mode
TX 3DH5
TX 2DH5
TX 3DH3
TX 2DH3
TX DH1
Stand-by, page mode 0
Antenna gain not taken into account
3.7 Current Consumption
Table 12: Receiver sensitivity
Table 13: Current consumption
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