WT32I-E-AI6

WT32i BLUETOOTH AUDIO MODULE DATA SHEET Tuesday, 22 July 2014 Version 1.21 Copyright © 2000-2014 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 1.0 First version 1.1 Added example how to protect the battery by shutting down the regulators at certain voltage level 1.2 Fixed PCM pin numbering 1.21 Design check list added Bluegiga Technologies Oy TABLE OF CONTENTS 1 Design Check List..........................................................................................................................................7 2 WT32i Product Numbering ............................................................................................................................8 3 Block diagram ................................................................................................................................................9 4 Pinout and Terminal Description ................................................................................................................ 10 5 Electrical Characteristics ............................................................................................................................ 13 5.1 Absolute Maximum Ratings ................................................................................................................ 13 5.2 Recommended Operating Conditions ................................................................................................. 13 5.3 Digital Terminals.................................................................................................................................. 13 5.4 Audio Characteristics .......................................................................................................................... 14 5.4.1 ADC .............................................................................................................................................. 14 5.4.2 DAC .............................................................................................................................................. 15 5.4.3 A2DP Codecs............................................................................................................................... 15 5.5 5.5.1 RF Transceiver ............................................................................................................................ 17 5.5.2 Antenna Characteristics ............................................................................................................... 18 5.6 6 RF Characteristics ............................................................................................................................... 17 Current Consumption .......................................................................................................................... 21 Power Control and Regulation ................................................................................................................... 22 6.1 Protecting the Battery by Configuring the Module to Turn Off at Certain Voltage .............................. 24 6.2 Reset ................................................................................................................................................... 25 6.2.1 Internal POR ................................................................................................................................ 25 7 Battery Charger .......................................................................................................................................... 27 8 GPIO and AIO Functions ............................................................................................................................ 28 8.1 iWRAP supported GPIO Functions ..................................................................................................... 28 8.2 Outputting Internal Clocks ................................................................................................................... 28 8.3 Auxiliary ADC ...................................................................................................................................... 29 8.4 Software I2C Interface ........................................................................................................................ 29 9 Serial Interfaces.......................................................................................................................................... 30 9.1 UART Interface.................................................................................................................................... 30 9.1.1 Resetting Through UART Break Signal ....................................................................................... 31 9.1.2 UART Configuration While Reset is Active .................................................................................. 31 9.1.3 UART Bypass Mode .................................................................................................................... 31 9.2 USB Interface ...................................................................................................................................... 32 9.3 Programming and Debug Interface (SPI) ............................................................................................ 33 10 Audio Interfaces ...................................................................................................................................... 34 10.1 Stereo Audio Codec Interface ...................................................................................................... 34 10.1.1 ADC .............................................................................................................................................. 34 10.1.2 DAC .............................................................................................................................................. 36 Bluegiga Technologies Oy 10.1.3 Microphone Input ......................................................................................................................... 37 10.1.4 Line Input ..................................................................................................................................... 38 10.1.5 Output Stage ................................................................................................................................ 39 10.1.6 Mono Operation ........................................................................................................................... 41 10.1.7 Side Tone ..................................................................................................................................... 41 10.2 PCM Interface .............................................................................................................................. 41 10.3 I2S Interface ................................................................................................................................. 41 10.4 IEC 60958 Interface ..................................................................................................................... 43 11 Design Guidelines ................................................................................................................................... 45 11.1 Audio Layout Guide ..................................................................................................................... 45 11.1.1 EMC Considerations .................................................................................................................... 45 11.1.2 Choosing Capacitors and Resistors ............................................................................................ 45 11.2 RF Layout Guide .......................................................................................................................... 46 11.3 Example Application Schematics ................................................................................................. 49 12 Physical Dimensions ............................................................................................................................... 53 13 Soldering Recommendations .................................................................................................................. 55 14 Package .................................................................................................................................................. 56 15 Certification Guidance for an End Product Using WT32i ....................................................................... 58 15.1 Bluetooth End Product Listing...................................................................................................... 58 15.2 CE Approval of an End-Product ................................................................................................... 58 15.3 FCC Certification of an End Product ............................................................................................ 59 15.3.1 Co-location with Other Transmitters ............................................................................................ 60 15.4 IC Certification of an End Product ............................................................................................... 60 15.5 MIC Japan Certification of an End Product .................................................................................. 60 16 WT32i Certifications ................................................................................................................................ 60 16.1 Bluetooth ...................................................................................................................................... 60 16.2 CE ................................................................................................................................................ 60 16.3 FCC .............................................................................................................................................. 61 16.4 IC .................................................................................................................................................. 62 16.4.1 IC .................................................................................................................................................. 62 16.5 MIC Japan .................................................................................................................................... 63 16.6 KCC (South-Korea) ...................................................................................................................... 63 16.7 Qualified Antenna Types for WT32i-E ......................................................................................... 63 17 Contact Information................................................................................................................................. 64 Bluegiga Technologies Oy WT32i Bluetooth® Audio Module DESCRIPTION KEY FEATURES: WT32i is an audio specific Bluetooth 3.0 module with excellent radio frequency performance and enhanced audio features, enabling a best in class Bluetooth audio experience. In addition to a certified Bluetooth radio and software stack, WT32i also contains a DSP, stereo audio codec, and battery charger making it ideal for fixed and portable audio applications. WT32i includes Bluegiga's iWRAP6 Bluetooth stack software which implements A2DP, AVRCP v.1.5 profiles and supports aptX® and AAC audio codecs for stereo audio applications. For hands-free applications iWRAP6 software also supports HFP v.1.6, HSP, MAP and PBAP and CVC® echo cancellation software. For data communications to Android and iOS applications iWRAP6 also implements Bluetooth Serial Port Profile (SPP) and Apple iAP profiles. WT32i is an ideal solution for developers who want to quickly integrate the latest Bluetooth audio technologies without the time and costs typically involved with a Bluetooth audio chipset design. APPLICATIONS:  Bluetooth 3.0 compliant  Excellent Radio Performance o Transmit power: +6.5 dBm o Receiver sensitivity: -90 dBm o Link budget: 96.5 dB  Integrated chip antenna antenna connector  Audio features or U.FL o Integrated DSP o 16-bit stereo codec o 44.1kHz ADC, 48kHz DAC o Analog, I2S, PCM, SPDIF, and microphone interfaces ® o Optional aptX and AAC stereo audio codecs ® o Optional cancellation CVC echo o Wide Band Speech  Built-in battery charger  UART host interface  802.11 co-existence interface  Stereo speakers and sound bars  10 software programmable IO pins  Hi-Fi devices  Operating voltage: 1.8V to 3.6V  Hands-free kits  Temperature range: -40C to +85C  Stereo headsets  Bluetooth, CE, FCC, IC, Korea and Japan qualified  Integrated iWRAP6 Bluetooth stack o 13 Bluetooth profiles o Apple iAP1 compatibility Figure 1: WT32i Bluetooth Audio Module Bluegiga Technologies Oy and iAP2 1 Design Check List POWERING THE MODULE  Make sure that VRE_ENA is connected correctly  Use iWRAP command SET CONTROL VREGEN command to configure the VREG_ENA pin according to the HW  Reserve test points for SPI interface for debugging and FW updates Battery Voltage (2.7V...4.4V) VDD_BAT VREG_ENA On/Off cntrl  The internal power on reset does not work properly if the host pulls the reset line low during boot. To prevent this, place a diode to the reset input. IN LDO EN (1.8V...3.6V) VDD_IO Battery Voltage (2.7V...4.4V) VDD_BAT VREG_ENA Host CPU On/Off cntrl IN LDO EN (1.8V...3.6V) VDD_IO WT32i GPIO Reset RF LAYOUT  Make sure that the layout for the antenna is done as instrcucted. Board edge Min 15mm Min 15mm 6mm Metal clearance area GND plane indentation 2mm GND plane indentation max 5.9 mm AUDIO DESIGN AND LAYOUT  See the example schematics on pages 49 -52  Avoid using single ended audio traces. Always use differential audio signaling when possible  Use solid GND plane and make sure that all the GND pins are connected to it by placing a GND via right next to any GND pins.  When routing single ended audio traces, make sure that the return current (i.e. GND) follows the traces all the way from start to the end Differential audio signalstarces are traced parallel Differential audio are routed to make sure they have perfect common mode symmetrically and parallel rejection . All the audio traces are routed on a solid GND plane.  DO NOT COMPROMISE AUDIO ROUTING Bluegiga Technologies Oy 2 WT32i Product Numbering Product code Description WT32i-A-AI6 WT32i Bluetooth Module with internal chip antenna and iWRAP6 Bluetooth software WT32i-A-AI6-APTX WT32i Bluetooth Module with internal chip antenna and aptX® audio codec capable iWRAP6 Bluetooth software. WT32i-A-AI6IAP WT32i Bluetooth Module with internal chip antenna and Apple iAP capable iWRAP6 Bluetooth software. Available only to Apple MFI licensees. Contact sales@bluegiga.com for more information. WT32i-E-AI6 WT32i Bluetooth Module with U.FL connector and iWRAP6 Bluetooth software WT32i-E-AI6-APTX WT32i Bluetooth Module with U.FL connector and aptX® audio codec capable iWRAP6 Bluetooth software. WT32i-E-AI6IAP WT32i Bluetooth Module with U.FL connector and Apple iAP capable iWRAP6 Bluetooth software. Available only to Apple MFI licensees. Contact sales@bluegiga.com for more information. DKWT32i-A WT32i development kit Bluegiga Technologies Oy 3 Block diagram Flash BC05-MM UART/USB RAM Antenna Balanced filtter 2.4 GHz Radio Baseband DSP PIO I/O Audio In/Out MCU PCM/I2S Kalimba DSP SPI XTAL Reset circuitry Figure 2: Block Diagram of WT32i BC05-MM The BlueCore®5-Multimedia External is a single-chip radio and baseband IC for Bluetooth 2.4GHz systems. It provides a fully compliant Bluetooth v3.0 specification system for data and voice. BlueCore5-Multimedia External contains the Kalimba DSP coprocessor with double the MIPS of BlueCore3-Multimedia External, supporting enhanced audio applications. XTAL Ther reference clock of WT32i is generated with 26 MHz crystal. All BC05-MM internal digital clocks are generated using a phase locked loop, which is locked to the frequency of either the 26 MHz crystal or an internally generated watchdog clock frequency of 1kHz. RESET CIRCUITRY The internal reset circuitry keeps BC05-MM in reset during boot in order for the supply voltages to stabilize. This is to prevent corruption of the flash memory during booting. Please see chapter 6.1 for more detailed description. BALANCED FILTER The internal balanced filter provides optimal impedance matching and band pass filtering in order to achieve lowest possible in-band and out-of-band emissions. ANTENNA The antenna is a ceramic chip antenna with high efficiency. The antenna is insensitive to surrounding dielectric materials and requires only a small clearance underneath which makes it compatible with previous WT32I designs and well suitable for designs with high density. FLASH 16 Mbit flash memory is used for storing the Bluetooth protocol stack and Virtual Machine applications. It can also be used as an optional external RAM for memory-intensive applications. Bluegiga Technologies Oy 4 Pinout and Terminal Description 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 AUDIO_OUT_P_LEFT AUDIO_OUT_N_LEFT GND AUDIO_OUT_P_RIGHT AUDIO_OUT_N_RIGHT AUDIO_IN_N_LEFT AUDIO_IN_P_LEFT GND AUDIO_IN_N_RIGHT AUDIO_IN_P_RIGHT MIC_BIAS GND VDD_CHG VDD_BAT LED0 SPI_MOSI SPI_MISO SPI_CLK SPI_NCSB GND GND RESET UART_NRTS UART_NCTS PIO8 PIO7 PIO6 PIO5 PIO4 PCM_IN PCM_OUT PCM_SYNC PCM_CLK 18 19 20 21 22 23 24 25 26 27 28 29 30 VREG_ENA GND GND GND AIO0 AIO1 PIO0 PIO1 PIO2 PIO3 USB_DUSB_D+ PIO9 PIO10 UART_RXD UART_TXD VDD_IO 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 Figure 3: WT32i Pin Number Pin Name Pad Type Description 1 VREG_ENA Input SW configurable enable pin for the internal regulators 2-4, 18, 31, 39, 43, 48 GND GND GND 17 VDD_IO Power supply 1.7V - 3.6V power supply for the serial interfaces and GPIOs 37 VDD_BAT Power supply / Charger output 2.7V - 4.4V supply voltage for the internal regulators and output of the battery charger 38 VDD_CHG Power supply Nominal 5V supply voltage for the battery charger Table 1: Supply Terminal Descriptions Bluegiga Technologies Oy Page 10 of 64 Pin Number Pin Name 19 RESET 5 AIO0 Pin Type Description RESET Active high reset. If not used, leave floating. When connected, make sure that the reset is either pulled high or floating (connected to high impedance) during boot. Configurable I/O AIO0 and AIO1 can be used to read the voltage level through the internal ADC (refer to iWRAP User Guide for details). AIO pins can also be configured to be used as general digital IO pins through PS settings. Internal clocks can be routed out through AIO pins by setting corresponding PS settings. Note that the AIO pins are powered from internal 1.5V supply so the maximum voltage level of the AIO pins is 1.5V. General purpose IO's can be configured with iWRAP for various functions. Each IO can be configured individually as output or input with strong or weak pull-up/-down. Using particular PS setting GPIO pins can be used to implement WiFi co-existence signaling between WT32i and a WiFi radio. Software I2C interface can be implemented for slow I2C functions such as configuring external audio codec or display. 6 AIO1 7 8 9 10 13 14 22 23 24 25 26 PIO0 PIO1 PIO2 PIO3 PIO9 PIO10 PIO8 PIO7 PIO6 PIO5 PIO4 Configurable CMOS I/O 11 USB_D- I/O 12 USB_D+ I/O 15 UART_RXD CMOS Input, weak internal pull-down UART data input 16 UART_TXD CMOS output, tristate, weak internal pull-up UART data output 20 UART_NRTS CMOS output, tristate, weak internal pull-up UART request to send, active low 21 UART_NCTS CMOS Input, weak internal pull-down UART clear to send, active low 32 SPI_NCSB 33 SPI_CLK USB data minus USB data plus with selectable internal 1.5k pull-up resistor CMOS Input, weak internal pull-down CMOS Input, weak internal pull-down SPI chip select SPI clock Bluegiga Technologies Oy Page 11 of 64 34 SPI_MISO 35 SPI_MOSI 36 LED0 CMOS Input, weak internal pull-down CMOS output, tristate, weak internal pull-down SPI data input SPI data output Open drain output LED driver Table 2: Terminal Descriptions Pin Number Pin Name Pin Type 40 41 42 44 45 46 47 49 50 MIC_BIAS AUDIO_IN_P_RIGHT AUDIO_IN_N_RIGHT AUDIO_IN_P_LEFT AUDIO_IN_N_LEFT AUDIO_OUT_N_RIGHT AUDIO_OUT_P_RIGHT AUDIO_OUT_N_LEFT AUDIO_OUT_P_LEFT Analog Analog Analog Analog Analog Analog Analog Analog Analog 27 PCM_IN / I2S IN 28 PCM_OUT / I2S_OUT 29 PCM_SYNC / I2S_WS Bidirectional, weak internal down PCM sync or I2S word select. WT32i can operate as a PCM/I2S master providing the sync or as a slave receiving the sync 30 PCM_CLK / I2S_SCK Bidirectional, weak internal down PCM or I2S clock. WT32i can operate as a PCM/I2S master providing the clock or as a slave receiving the clock. Description CMOS input, weak internal pull-down CMOS outptu, tristate, weak internal pull-down PCM or I2S data input PCM or I2S data output Table 3: Audio Terminal Descriptions Bluegiga Technologies Oy Page 12 of 64 5 Electrical Characteristics 5.1 Absolute Maximum Ratings Storage temperature range Operating temperature range VDD_IO VDD_BAT VDD_CHG Digital Terminal voltages AIO voltages Min Max Unit -40 -40 -0.4 -0.4 -0.4 VSS - 0.4V VSS - 0.4V +85 +85 3.6 4.4 6.5 VDD + 0.4V 1.9V °C V V V V V °C Table 4: Absolute Maximum Ratings 5.2 Recommended Operating Conditions Storage temperature range Operating temperature range VDD_IO VDD_BAT VDD_CHG Digital Terminal voltages AIO voltages Min Max Unit -40 -40 1.7 2.7 0 0 0 +85 +85 3.6 4.4 6.5 VDD 1.5V °C V V V V V °C Table 5: Recommended Operating Conditions 5.3 Digital Terminals Input/Output Characteristic Min Max Unit VIL input logic level low VIL input logic level high -0.3 0.625 x VDD 0.25 x VDD VDD + 0.3 V V VOL output logic level low, IOL = 4.0mA VOL output logic level high, IOL = -4.0mA Strong pull-up Strong pull-down Weak pull-up Weak pull-down 0 0.75 x VDD -100 10 -5 0.2 0.125 VDD -10 100 -0.2 5 V V µA µA µA µA Table 6: Digital Terminal Characteristics Bluegiga Technologies Oy Page 13 of 64 5.4 Audio Characteristics 5.4.1 ADC Parameter Conditions Min Typ Max Unit - - - 16 Bits - 8 - 44.1 kHz 8kHz - 79 - dB 11.025kHz - 77 - dB 16kHz - 76 - dB 22.050kHz 32kHz - 76 75 - dB dB Resolution Input Sample Rate, Fsample Fsample Signal to Noise Ratio, SNR 44.1kHz - 75 - dB Input full scale at maximum gain (differential) - 4 - mV rms Input full scale at minimum gain (differential) - 800 - mV rms 3dB Bandwidth - 20 - kHz Microphone mode input impedance - 6.0 - kHz THD+N @ 30mV rms input - 0.04 - % Table 7: ADC characteristics Bluegiga Technologies Oy Page 14 of 64 5.4.2 DAC Parameter Conditions Min Typ Max Unit - - - 16 Bits - 8 - 48 kHz 8kHz - 95 - dB 11.025kHz - 95 - dB 16kHz - 95 - dB 22.050kHz 32kHz - 95 95 - dB dB 44.1kHz - 95 - dB - 750 - mV rms Resistive 16 - O.C. Ω Capacitive - - 500 pF THD+N 16Ω Load - - 0.1 % THD+N 100Ω Load - - 0.01 % Resolution Output Sample Rate, Fsample Fsample Signal to Noise Ratio, SNR Output Full Voltage Swing (differential) Allowed Load Table 8: DAC Characteristics 5.4.3 A2DP Codecs 5.4.3.1 SBC SBC codec is the default codec used for Bluetooth A2DP connections. Any Bluetooth device supporting A2DP audio profile supports SBC codec. SBC was originally design to provide reasonable good audio quality while keeping low computational complexity. SBC does not require high bit rates. Thus it works sufficiently with Bluetooth where the bandwidth and the processing power are limited. 5.4.3.2 aptX® The aptX is widely used in high quality audio devices. aptX can provide dynamic range up to 120 dB and it ® has the shortest coding delay (100ms) compared to aptX . Because of high processing capacity requirement for encoding, WT32i does not support AAC as A2DP source. Thus WT32i can be used for receiving (A2DP sink) AAC (from iPhone for example) but it cannot transmit AAC coded audio. Bluegiga Technologies Oy Page 16 of 64 5.5 RF Characteristics 5.5.1 RF Transceiver Transceiver characteristic Min Typ Max Maximum transmit power Minimum transmit power 5 6.5 -17 8 Transmit power stability over the temperature range dB 1 -90 -91 -86 -83 -84 -80 dBm dBm +/- 0.5 Transmit power variation within the BT band RT -40C Sensitivity DH1 +85C RT -40C Sensitivity 3DH5 +85C Unit dB dBm dBm dBm dBm dBm dBm Table 9: Transceiver characteristics Table 10: Power control of WT32i Bluegiga Technologies Oy Page 17 of 64 Band / Frequency Standard Min (AVG / PEAK) Unit 54 / 74 dBuV/m 54 / 74 dBuV/m Band edge 2390MHz 54 / 74 dBuV/m Band edge 2483.5MHz 54 / 74 dBuV/m Band edge 2400MHz (conducted) -20 dBc Band edge 2483.5MHz (conducted) -20 dBc Band edge 2400MHz -30 dBm 50 / 61 < 40 / 50 3rd harmonic ETSI EN 300 328 transmitter spurious emissions ETSI EN 300 328 receiver spurious emissions Max (AVG / PEAK) Limit by the Standard (AVG / PEAK) 2nd harmonic FCC part 15 transmitter spurious emissions Typ (AVG / PEAK) 2nd harmonic -35 -30 dBm 3rd harmonic (2400 - 2479) MHz