WT41-E DATA SHEET Friday, 17 May 2013 Version 1.
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.
VERSION HISTORY Version Comment 1.34 FCC and MIC Japan update 1.33 NCC labeling info added in Chinese 1.32 NCC certification info added. HCI30 removed from the ordering information list. 1.31 Absolute maximum supply voltage 3.7V 1.3 Certification information updated 1.2 Typo corrections 1.1 Power vs supply voltage figure added 1.
TABLE OF CONTENTS WT41-E .................................................................................................................................................................1 Data Sheet ............................................................................................................................................................1 ...................................................................................................................1 1 Ordering Information...............
9.5 GCI Interface ....................................................................................................................................... 29 9.6 Slots and Sample Formats .................................................................................................................. 30 9.7 Additional Features ............................................................................................................................. 31 9.8 PCM_CLK and PCM_SYNC Generation ............
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.
1 Ordering Information WT41-E-HCI Firmware HCI = HCI21= AI = AI3 = AI4 = C = HCI firmware (Bluetooth 2.0 + EDR) HCI firmware (Bluetooth 2.1 + EDR) iWRAP 2.2.0 iWRAP 3.0.0 iWRAP 4.0.0 Custom* HW version E = u.
59 58 57 56 55 54 53 2 Pinout and Terminal Description 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 2 3 4 5 6 7
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-direc
USB Interfaces PIN NUMBER PAD TYPE USB+ 17 Bidirectional USB- 18 Bidirectional DESCRIPTION USB data plus with selectable internal 1.
3 Electrical Characteristics 3.1 Absolute Maximum Ratings Rating Storage Temperature Min -40 Max 85 Unit °C VDD_PA, VDD -0.4 3.7 V VSS-0.4 VDD+0.4 V Max 85 3.6 Unit °C V 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.
3.4 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 1 - dB RF power variation over supply voltage range (* 2 - dB 2 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.
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) 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 -20 dBc -50 Band edge 2483.
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.
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.
4 Physical Dimensions Figure 4: Physical dimensions (top view) Figure 5: Dimensions for the RF pin (top view) Bluegiga Technologies Oy Page 16 of 44
25.3 mm 3.35 mm 35.3 mm 11.4 mm 14.0 mm 32.
– • – –5 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.
6 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.
Equation 1: Data Rate Table 15: Standard Data Rates Bluegiga Technologies Oy Page 20 of 44
6.1 UART Bypass Figure 11: UART Bypass Architecture 6.2 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. 6.
7 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.
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 7.5 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.
Figure 14: USB Connections for Bus-Powered Mode 7.6 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.
Figure 15: USB_Detach and USB_Wake_Up Signals 7.8 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. 7.9 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.
8 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.
9 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.
Figure 17: PCM Interface Slave 9.2 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 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. 9.4 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 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. 9.6 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.
Figure 22: 16-bit Slot Length and Sample Formats 9.7 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. 9.8 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.
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 3: 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. 9.
Name Bit position Description - 0 SLAVE MODE EN 1 SHORT SYNC EN 2 - 3 SIGN EXTENDED EN 4 LSB FIRST EN 5 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).
10 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].
11 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.
11.
12 Certifications WT41-E is compliant to the following specifications. 12.1 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. 12.
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 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.
“Contains Transmitter Module IC: 5123A-BGTWT41E” or “Contains IC: 5123A-BGTWT41E” To comply with 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 20 cm is maintained between the radiator (antenna) and all persons at all times and must not be co-located or operating in conjunction with any other antenna or transmitter. 12.3.
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.
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. 12.
12.7.1 NCC Taiwan labeling requirements WT41-E is labeled with its own NCC ID number, and, if the NCC ID is 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.
4 5 Antenova Litecon B4844/B6090 CAR-ATR-187-001 1.4 0.
13 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.
