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WT21

型号：

WT21

描述：

WT21评估套件[ WT21 EVALUATION KIT ]

品牌：

ETC[ ETC ]

页数：

16 页

PDF大小：

237 K

下载PDF手册
WT21 EVALUATION KIT  
DATA SHEET  
Friday, 05 February 2010  
Version 1.3  
Copyright © 2000-2010 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  
0.1  
Comment  
First draft  
1.0  
First release  
1.1  
Added images  
Bootstrap added  
Pin out numbers fixed  
1.2  
1.3  
Bluegiga Technologies Oy  
TABLE OF CONTENTS  
1
2
3
4
5
6
Introduction................................................................................................................................................... 5  
Physical outlook............................................................................................................................................ 6  
Schematics................................................................................................................................................... 7  
Assembly.................................................................................................................................................... 10  
Layout......................................................................................................................................................... 11  
Interfaces.................................................................................................................................................... 12  
6.1 Powering the evaluation board............................................................................................................. 12  
6.2 UART.................................................................................................................................................... 12  
6.3 Host selection DIP switch..................................................................................................................... 12  
6.3.1  
6.3.2  
6.3.3  
UART protocol selection .............................................................................................................. 12  
UART baudrate negotation .......................................................................................................... 13  
Loading the PS keys.................................................................................................................... 13  
6.4 SPI interface ......................................................................................................................................... 14  
6.5 SDIO and PIO interface........................................................................................................................ 14  
6.6 PCM Codec and Audio Interface.......................................................................................................... 14  
WEEE Compliance..................................................................................................................................... 15  
Contact Information .................................................................................................................................... 16  
7
8
Bluegiga Technologies Oy  
1 Introduction  
FEATURES  
Evaluation kit for WT32 Bluetooth audio module containing  
o
o
o
o
o
o
o
o
o
RS-232 serial interface (230400bps)  
USB interface for power supply  
SPI for upgrading the firmware and parameters  
Reset button  
PCM codec (OKI MSM7702-01)  
2 x 3,5mm audio jacks for line in and line out  
24 pin I/O interface (PIO1 – PIO9, UART, SDIO, PCM, GND, 3V3, ENA)  
DIP switches for host interface configuration  
Current measurement point  
Host controller interface  
TARGET APPLICATIONS  
WT21 Evaluation Kit is meant for evaluation and development of WT21 Bluetooth module or prototyping and  
piloting Bluetooth systems utilizing WT21 module.  
ELECTRICAL FUNCTIONALITY  
Please, refer to the latest WT21 data sheet for information about WT21 Bluetooth module. The physical  
outlook, schematics, assembly and the PIN configurations of the interfaces of WT21 evaluation Kit are  
described in this document.  
SOFTWARE FUNCTIONALITY  
WT32 evaluation kit is delivered with Host Controller Interface (HCI) firmware, so WT21 only implements the  
lowest levels of Bluetooth stack. WT21 always requires a host system that implements the upper layers of  
Bluetooth stack and at least one Bluetooth profile.  
Bluegiga Technologies Oy  
Page 5 of 16  
 
2 Physical outlook  
Figure 1: WT21 front view  
Figure 2: WT21 back view  
Bluegiga Technologies Oy  
Page 6 of 16  
 
3 Schematics  
Figure 3: EKWT21 Schematic (1/3)  
Bluegiga Technologies Oy  
Page 7 of 16  
 
Figure 4: EKWT21 Schematic (2/3)  
Bluegiga Technologies Oy  
Page 8 of 16  
Figure 5: EKWT21 Schematic (3/3)  
Bluegiga Technologies Oy  
Page 9 of 16  
4 Assembly  
Figure 6: Assembly Drawing of EKWT21  
Bluegiga Technologies Oy  
Page 10 of 16  
 
5 Layout  
Figure 7: Top Layer Layout  
Figure 8: Bottom Layer Layout  
Bluegiga Technologies Oy  
Page 11 of 16  
 
6 Interfaces  
6.1 Powering the evaluation board  
The board can be powered either through a USB connector J10 or using a laboratory power supply through  
pin header J4. LDO TPS79933DDCT is used to regulate 3.3V supply voltage for the module (VREG_IN and  
VDD_PADS). Maximum input voltage for the regulator is 6.5V. Enable pins of the internal regulators of the  
module (VREG_ENA) are tight to 3.3V supply through zero ohm resistor R1.  
6.2 UART  
UART interface of the module is available in the pin header J3. When UART is being used through the pin  
header the RS232 transceiver U2 should be switched to high impedance using SW11. When using RS232  
through J5 the transceiver should be enabled with SW11. The maximum baud rate of the transceiver in the  
evaluation board is 235kbps.  
6.3 Host selection DIP switch  
DIP switch SW1 is used for the host selection as described below.  
The MCU of WT21 selects the UART/SDIO interfaces by reading PIO[4] at boot-time. When PIO[4] is high, the  
SDIO interface is enabled; when PIO[4] is low, the UART is enabled.  
If in UART mode, the MCU selects the UART transfer protocol automatically using the unused SDIO pins  
shown in Table 1.  
Table 1: SDIO_CLK and SDIO_CMD transfer Protocols  
6.3.1 UART protocol selection  
At bootup the module looks at PIO4 to determine whether it should use UART or SDIO/CSPI. If PIO4 is pulled  
low then UART will be used. It then checks SDIO_CLK and SDIO_CMD pins to determine which mode it  
should use for receiving initial pskeys over UART.  
Note:  
When the switch on the eval board is conducting (marked by "on") then the pin is pulled low which is marked by 0.  
To use the H4 UART protocol for configuring the WT21 the PIO4 should be pulled low, the SDIO_CLK should  
be pulled low and SDIO_CMD must be pulled high. Note that by default there is a weak pull-up for these pins  
so if nothing is connected to them, they will be pulled high.  
Bluegiga Technologies Oy  
Page 12 of 16  
 
 
 
 
 
6.3.2 UART baudrate negotation  
When PIO4, CLK and CMD are all pulled low, BCSP over UART is selected. The speed for this initial  
communication should be between 57600bps and 115200bps and must use even parity.  
Since the WT21 doesn't know its internal clock frequency nor the baud rate it should communicate at, a form  
of baud rate auto-negotiation is implemented on the module. The host needs to send some data packets so  
that the WT21 can assess the baud rate the host uses.  
Any seemingly non-uniform data can be used but for BCSP sending Link Establishment packets is the natural  
choice. Once the WT21 has received enough samples it will start communicating back to the host by replying  
to the Link Establishment messages.  
Since the H4 doesn't have any link protocol, repeated queries for some known value can be used. Once the  
host has started receiving replies for the queries, it can be assumed that that the baud rate has been  
established.  
Note:  
The number of packets the WT21 will need for assessing the baud rate is dependent on the host's UART hardware. With poor  
quality UARTs the auto-negotiation may fail, which means the WT21 will use an incorrect baud rate to communicate back. The  
host will see this as packets of garbage, i.e. full of crc errors and checksum errors when using BCSP. To restart the negotiation  
the host will need to reset the WT21. The host should have some way to power cycle the WT21 to restart the baud rate  
negotiation, either by controlling the reset pin or directly the module's VCC.  
6.3.3 Loading the PS keys  
Once a communications link has been established, BCCMD packets are used to load PS Keys. At least the  
following PS Keys need to be set:  
Key address  
&0001  
&01be  
&01fe  
&025d  
Value  
00dd eeff 00cc aabb  
01d8  
6590  
0001  
0001  
Description  
Bluetooth address (aa:bb:cc:dd:ee:ff)  
UART baud rate (01d8 = 115200)  
Chrystal frequency. Do not modify.  
VM disable. Do not modify.  
Host interface, (0001 = BCSP)  
&01f9  
For the host interface the following protocols are supported:  
BCSP 0001  
H4 0003  
H5 0006  
H4DS 0007  
To activate the changes the command for warm reset is sent to the WT21.  
After this the module will immediately reboot using the configured settings and thus switch to the specified  
baud rate.  
Bluegiga Technologies Oy  
Page 13 of 16  
 
 
6.4 SPI interface  
SPI is available in the pin header J1. Following table shows the connections in the pin header. 3.3V is an  
output from the evaluation board and it is used to power the on board installation kit delivered with the kit.  
PIN name  
MISO  
No.  
I/O  
Description  
MISO  
1
2
3
4
5
6
O
3.3 V  
CLK  
POWER  
3.3 V power supply input  
I
CLK  
MOSI  
CSB  
MOSI  
CSB  
GND  
I
I
GND  
GND  
Table 2: SPI interface pin description  
6.5 SDIO and PIO interface  
All SDIO and PIO connections are available in the pin header J3.  
6.6 PCM Codec and Audio Interface  
The evaluation board uses MSM7702 PCM codec by OKI Semiconductor. PS settings for the codec are as  
follows:  
o
o
o
PCM_DATAFORMAT 0200  
PCM_CONFIG32 180000C0  
HOST_IO_MAP_SCO_PCM true  
Headset can be connected to 3.5mm jack connectors J6 and J7.  
Bluegiga Technologies Oy  
Page 14 of 16  
 
 
 
7 WEEE Compliance  
The crossed-out wheeled bin means that within the European Union the product  
must be taken to separate collection at the product end-of-life. Do not dispose of  
these products as unsorted municipal waste.  
Bluegiga Technologies Oy  
Page 15 of 16  
 
8 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:  
Postal address:  
Sales Office / USA:  
Sinikalliontie 5A  
02630 ESPOO  
FINLAND  
P.O. BOX 120  
02631 ESPOO  
FINLAND  
Phone: (781) 556-1039  
Bluegiga Technologies, Inc.  
99 Derby Street, Suite 200 Hingham, MA 02043  
Bluegiga Technologies Oy  
Page 16 of 16  
 
厂商 型号 描述 页数 下载

XPPOWER

 		WT200 直流 - 直流电源[ DC-DC Power Supplies ] 2 页

XPPOWER

 		WT201 直流 - 直流电源[ DC-DC Power Supplies ] 2 页

ETC

 		WT201A 直流到直流转换器\n[ DC to DC Converter ] 2 页

ETC

 		WT201AX 直流到直流转换器\n[ DC to DC Converter ] 2 页

XPPOWER

 		WT201X [ Analog Circuit ] 2 页

XPPOWER

 		WT201XU [ Analog Circuit ] 2 页

XPPOWER

 		WT202 直流 - 直流电源[ DC-DC Power Supplies ] 2 页

TDK

 		WT202012-15F2-ID [ General Purpose Inductor, ] 1 页

XPPOWER

 		WT202A [ Analog Circuit ] 2 页

XPPOWER

 		WT202AX [ Analog Circuit ] 2 页

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