WT21
DATA SHEET
Wednesday, 10 March 2010
Version 1.74
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.
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VERSION HISTORY
Version
0.1
0.2
0.3
0.4
0.5
1.0
1.1
1.2
1.3
1.4
1.41
1.5
1.6
1.7
1.71
1.72
1.73
1.74
Comment
First draft
Block diagram, descriptions added
Preliminary version
Fixed ordering codes added captions
Power control and regulation info added. Layout guide updated.
Minor updates and fixes.
Electrical characteristic added. Some minor updates.
Function of the regulator enable pin corrected. Some minor
updates.
New template
Pinout fixed (GND pins 1 – 3 removed, pin 23 grounded). Layout
guide updated.
Improved dimensions chapter
Table 5 fixed (pad types)
Footprint added
Footprint fixed. Pin number 3 (NC) added.
Recommended PCB land pattern for WT21-N added, power control
and regulation updated. Certification information added
Information about qualified antenna types added
Minor updates to chapter 14.5
Physical dimensions corrected
UART directions clarified to table 5
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TABLE OF CONTENTS
1
2
3
Ordering Information ................................................................................................. 8
Pinout and Terminal Description .................................................................................. 9
Microcontroller, Memory and Baseband Logic .............................................................. 12
3.1
AuriStream CODEC ............................................................................................. 12
AuriStream CODEC Requirements ................................................................... 13
AuriStream Hierarchy .................................................................................... 13
3.1.1
3.1.2
3.2
3.3
3.4
3.5
3.6
4
5
4.1
5.1
5.2
Memory Managements Unit ................................................................................. 14
Burst Mode Controller ......................................................................................... 14
Physical Layer Hardware Engine DSP .................................................................... 14
WLAN Coexistence ............................................................................................. 15
Configurable I/O Parallel Ports ............................................................................. 15
32kHz External Reference Clock ........................................................................... 16
WT21 Serial Peripheral Interface (SPI) .................................................................. 17
Instruction Cycle ................................................................................................ 17
Writing to the Device .................................................................................... 17
Reading from the Device ............................................................................... 18
Multi-Slave Operation .................................................................................... 18
Clock Generation ..................................................................................................... 16
Serial Peripheral Interface (SPI) ................................................................................ 17
5.2.1
5.2.2
5.2.3
6
6.1
6.2
7
Host Interfaces ........................................................................................................ 19
Host Selection ................................................................................................... 19
UART Interface .................................................................................................. 19
UART Configuration While Reset is Active ........................................................ 21
CSPI Read/Write Cycles ................................................................................. 22
CSPI Register Write Cycle .............................................................................. 23
CSPI Register Read Cycle .............................................................................. 23
CSPI Register Burst Write Cycle...................................................................... 23
CSPI Register Read Cycle .............................................................................. 24
SDIO/CSPI Deep-Sleep Control Schemes ......................................................... 25
Retransmission ............................................................................................. 25
Signaling ..................................................................................................... 25
6.2.1
7.1.1
7.1.2
7.1.3
7.1.4
7.1.5
7.2
7.2.1
7.2.2
7.2.3
8
8.1
CSR Serial Peripheral Interface (CSPI)........................................................................ 22
SDIO Interface .................................................................................................. 25
Audio Interfaces ...................................................................................................... 26
PCM Interface .................................................................................................... 26
PCM Interface Master/Slave ........................................................................... 26
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8.1.1
8.1.2
8.1.3
8.1.4
8.1.5
8.1.6
8.1.7
8.1.8
8.1.9
8.1.10
8.2
9
9.1
9.2
9.3
9.4
10
10.1
10.1.1
10.2
11
11.1
11.2
11.3
11.3.1
11.3.2
11.3.3
11.3.4
11.4
12
13
Long Frame Sync .......................................................................................... 27
Short Frame Sync ......................................................................................... 28
Multi-Slot Operation ...................................................................................... 28
GCI Interface ............................................................................................... 29
Slots and Sample Formats ............................................................................. 29
Additional Features ....................................................................................... 30
PCM Timing Information ................................................................................ 31
PCM_CLK and PCM_SYNC Generation .............................................................. 34
PCM Configuration ..................................................................................... 34
Digital Audio Interface (I2S) ................................................................................ 37
Power Control and Regulation .............................................................................. 40
VREG_ENABLE ................................................................................................... 40
RST# ................................................................................................................ 40
Digital Pin States on Reset .................................................................................. 41
Bluetooth Radio .................................................................................................... 43
Bluetooth Receiver ........................................................................................ 43
RSSI Analogue to Digital Converter .............................................................. 43
Bluetooth Transmitter ................................................................................... 43
Absolute Maximum Ratings ............................................................................ 44
Recommended Operating Conditions ............................................................... 44
Input/Output Terminal Characteristics ............................................................. 44
Linear Voltage Regulator ............................................................................. 44
Digital ...................................................................................................... 45
Reset ....................................................................................................... 45
32 kHz External Reference Clock .................................................................. 45
Power Consumption ...................................................................................... 46
Power Control and Regulation.................................................................................... 40
Electrical Characteristics ........................................................................................ 44
Physical Dimensions .............................................................................................. 47
Layout Guidelines ................................................................................................. 50
WT21-N....................................................................................................... 50
WT21-A ....................................................................................................... 50
Bluetooth .................................................................................................... 52
FCC ............................................................................................................ 52
CE .............................................................................................................. 53
Industry Canada (IC) .................................................................................... 53
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13.1
13.2
14
14.1
14.2
14.3
14.4
Certifications ........................................................................................................ 52