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http://www.buddies-tech.com BTM8670 DATASHEET BTM8670 Bluetooth Module Data Sheet Document Type: Bluetooth Module Datasheet Document Version: V1.0 Release Date: March 06 , 2013 Copyright 2012 by Buddies Technology Limited. All Rights Reserved. Reproduction of this document, in part of in whole, by any means is prohibited without written permission From Buddies Technology Limited. The information co ntained herein is believed to be accurate as of the date of publication. However, Buddies is not li able for any damages, including indirect or consequential from the use of software this documen t represents, or any reliance of the accuracy of this document. Buddies reserves the right to change the contents of this document at any time without notice. This document contains proprietary confidential trade secrets and may be subject to additional restrictions contained in the licensing agreement under which this document was obtained.
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Date Version Description Author 2013-03-06 V1.0 First Release
http://www.buddies-tech.com BTM8670 DATASHEET CONTENT
http://www.buddies-tech.com BTM8670 DATASHEET The BTM8670 Bluetooth ® module is a perfect consumer audio solution for wi reless applications, such as wireless sound bars, wireless stereo speakers and headphones. It can be connected with any Bluetooth ® devices in an operating range. It is slim and light so the designers can have better flexibilities for the product shapes. The BTM8670 Bluetooth ® module complies with Bluetooth® specification version 4.0. It supports HSP ,HFP ,A2DP ,AVRCP ,PBAP ,MAP ,SPP….profiles. It integrates an ultra-low-power DSP and application processor with embedded flash memory, a high-performance stereo codec, a power management s ubsystem, LED and LCD drivers and capacitive touch sensor inputs in a SOC IC. The dual-core architect with flash memory enables manufactures to easily differe ntiate the products with new features without extending development cycles. It i ntegrates RF Baseband controller, antenna,… etc. and provide UART interface, programm able I/O, stereo speaker output, microphone input,… etc. The detail information of BTM8670 Bluetooth ® module is presented in this document below. Figure 1
http://www.buddies-tech.com BTM8670 DATASHEET Small overall dimension(22mm x 15mm x 2mm ) Bluetooth Specification V4.0(Dual Mode) Class1,Class 2and Class 3 support Physical connection as SMD type 80MHz RISC MCU and 80MIPS Kalimba DSP 16Mb internal flash memory(64-bit wide,45ns);optional support for 64Mb of external SPI flash Stereo codec with 2 channels ADC and up to 6 microphone inputs(include bias generators and digital microphone support) Support for CSR’s latest CVC technology for narrow-band and wideband voice connections including wind noise reduction Music Enhancements: SBC,MP3,AAC and AAC+, Fast stream codec,atpX,5-band EQ,3D stereo separation and so on. Audio Interfaces: I2S,PCM and SPDIF Serial Interfaces: UART,USB 2.0,I2C and SPI Support HSP, HFP, A2DP, AVRCP,PBAP,MAP,SPP,iAP profile Multipoint support for HFP connection to 2 handsets for voice Multipoint support for A2DP connection to 2 A2DP source for music play back
3 Hardware LED controllers (for RGB) and ability to drive LCD segment
Support for up to 6 capacitive touch sensor inputs Built-in RF combo filter, Integrated 26M Crystal. No radio signal interference, support for 802.11 co-existence ※ Some features are optional for customization on demand.
http://www.buddies-tech.com BTM8670 DATASHEET TVs Smart remote controllers Wired or wireless sound bars Wired or wireless speakers and headphones Wearable audio with sensors(health and well-being applications)
http://www.buddies-tech.com BTM8670 DATASHEET "#$! Bluetooth Specification Chip Set CSR8670 Module ID BTM8670 BT Standard Bluetooth® V4.0 specification RF TX Output Power 10dBm (Max) Sensitivity -90dBm@0.1%BER Frequency Band 2.402GHz~2.480GHz ISM Band Baseband Crystal OSC 26MHz Hopping 1600hops/sec, 1MHz channel space RF Input Impedance 50 ohms Major Interface Microphone : Input (Differential) Speaker : Output (Differential) UART : Tx/Rx PIOs Antenna Profile HSP, HFP, A2DP, AVRCP,PBAP,MAP,SPP Voice Processor 80MIPS Kalimba with cVc support Power Supply Voltage 3.0V ~ 4.2V DC Working Current 15mA typical, Depends on profiles Standby Current <1mA Operating Environment Temperature -40ºC to +85ºC Humidity 10%~90% Non-Condensing Environmental RoHS Compliant
http://www.buddies-tech.com BTM8670 DATASHEET $%&# Dimension Figure 2
http://www.buddies-tech.com BTM8670 DATASHEET Pin Definition Figure 3
http://www.buddies-tech.com BTM8670 DATASHEET Pin# Pin Name Pad Type Description
1 CAP_SENSE_5 Analogue input Capacitive touch sensor input
CAP_SENSE_2 Analogue input Capacitive touch sensor input
3 CAP_SENSE_0 Analogue input Capacitive touch sensor input
5 AIO_1 Bi-directional Analogue programmable input / output line
6 PCM_IN/PIO_17
pull_down Synchronous data input. Alternative function PIO[17]
7 PCM_CLK/PIO_20
pull_down Synchronous data clock. Alternative function PIO[20]
8 PCM_SYNC/PIO_19
pull_down Synchronous data sync. Alternative function PIO[19]
9 PCM_OUT/PIO_18
pull_down Synchronous data output. Alternative function PIO[18] 10 BT_RESET Input with strong pull-up Reset if low. Input debouched so must be low for >5ms to cause a reset
11 SPI_CLK Input with weak pull-down SPI Clock
12 SPI_MOSI Input with weak pull-down
13 SPI_CSB Input with strong pull-up
Chip select for SPI, active low
14 SPI_MISO Output with weak pull-down SPI data output
15 UART_RTS
pull_up UART request to send, active low. Alternative function PIO[16]
16 SPI_CTS
pull_down UART clear to send, active low
17 UART_RX Bi-directional with strong
pull_up UART data input
18 UART_TX
pull_up UART data output
19 GND Ground
20 LED_0 Open drain LED driver
Alternative function PO[29]
21 LED_1 Open drain LED driver
Alternative function PO[30]
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22 LED_2 Open drain LED driver
Alternative function PO[31]
23 PIO_0
pull_down Programmable input/output line
24 PIO_1
pull_down Programmable input/output line
25 PIO_2
pull_down Programmable input/output line
26 GND Ground
27 USB_DP Bi-directional USB data plus with selectable internal
1.5kohm pull-up resistor
28 USB_DN Bi-directional
29 VDD_USB NC Positive supply for USB ports
30 PIO_3
pull_down Programmable input/output line
31 PIO_4
pull_down Programmable input/output line
32 PIO_5
pull_down Programmable input/output line
33 PIO_6
pull_down Programmable input/output line
34 PIO_7
pull_down Programmable input/output line
35 PIO_10
pull_down Programmable input/output line
36 PIO_11
pull_down Programmable input/output line
37 PIO_12
pull_down Programmable input/output line
38 PIO_13
pull_down Programmable input/output line
39 PIO_14
pull_down Programmable input/output line
40 PIO_15
pull_down Programmable input/output line
41 VDD_PADS NC
1.7V to 3.6V positive supply input for digital input/output ports PIO[15:4]
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45 VBAT_SENSE NC Battery charger sense input
Alternative supply via bypass regulator for 1.8V and 1.35V Switch mode power supply regulator inputs. Must be connected to the same potential as VOUT _3V3.
47 CHG_EXT NC External battery charger control
49 3V3_OUT NC 3.3V bypass linear regulator output
50 GND Ground
51 MIC_RN Analogue in
Microphone input negative, right
52 MIC_RP
Analogue in Microphone input positive, right
53 MIC_BIAS_B Analogue out Microphone bias B
54 MIC_BIAS_A Analogue out Microphone bias A
55 MIC_LN Analogue in
Microphone input negative, left
56 MIC_LP
Analogue in Microphone input positive, left
57 AGND Ground
58 SPKR_LN Analogue out Speaker output negative, left
59 SPKR_LP Analogue out Speaker output positive, left
60 SPKR_RN Analogue out Speaker output negative, right
61 SPKR_RP Analogue out Speaker output positive, right
62 AIO_0 Bi-directional Analogue programmable input / output line
63 GND Ground
42 GND Ground
43 PWR Input enable
Regulator enable input. Can also be sensed as an input. Regulator enable and multifunction button. A high input (tolerant to VBAT) enables the on-chip regulators, which can then be latched on internally and the button used as a multifunction input.
44 VBAT Power supply Battery positive terminal
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64 RF_IN RF
Bluetooth 50ohm transmitter output/receiver input
65 GND Ground
CAP_SENSE_ Analogue input Capacitive touch sensor input CAP_SENSE_ Analogue input Capacitive touch sensor input CAP_SENSE_ Analogue input Capacitive touch sensor input
http://www.buddies-tech.com BTM8670 DATASHEET '$%&# 4.1 Power Supply The transient response of the regulator is importan t. If the power rails of the module are supplied from an external voltage source, the trans ient response of any regulator used should be 20s or less.
4.2 Audio Interfaces
The Audio interface circuit consists of: Stereo/dual-mono audio codec Dual analogue audio inputs Dual analogue audio outputs 6 digit MEMS microphone inputs A configurable PCM,I2S or SPDIF interface As below shows the functional blocks of the interface. The codec supports stereo/dual-mono playback and recording of audio signals at multiple sample rates with a 16-bit resolution. The ADC and DAC of the codec each contain 2 independent high-quality channels. Any ADC or DAC channel runs at its own independent sample rate. The interface for the digital audio bus shares the same pins as the PCM codec interface described in section as below which means each of the audio buses are mutually exclusive in the usage. As below lists these alternative functions. Figure 4 Figure 5
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4.2.1 Audio Codec Interface
The main features of the interface are: Stereo and mono analogue input for voice band and audio band Stereo and mono analogue output for voice band and audio band Support for stereo digital audio bus standards such as I2S Support for IEC-60958 standard stereo digital audio bus standards, e.g. SPDIF and AES3(also known as AES/EBU) Support for PCM interfaces including PCM master codec that require an external system clock
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4.2.2 ADC
Figure 3 shows the CSR8670 consists of 2 high-quality ADCs: Each ADC has a second-order Sigma-Delta converter Each ADC is a separate channel with identical functionality There are 2 gain stages for each channel,1 of which is an analogue gain stage and the other is a digital gain stages
4.2.3 ADC Sample Rate Selection
Each ADC supports the following pre-defined sample rates, although other rates are progrmmable,e.g.40kHz: 8kHz 11.025 kHz 16kHz 22.050kHz 24kHz 32 kHz 44.1kHz 48 kHz
4.2.4 ADC Digital Gain
A digital gain stage inside the ADC varies from -24dB to 21.5dB,see as below, there is also a fine gain interface with 9-bit gain setting allowing gain changes in 1/32 steps. The Firmware controls the audio input gain.
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4.2.5 DAC
The DAC consists of: 2 fourth-order Sigma-Delta converters enabling 2 separate channels that are identical functionality, as figure x shows 2 gain stages for each channel, 1 of which is an analogue gain stage and the other is a digital gain stage
4.2.6 DAC Sample Rate Selection
11.025kHz 16kHz 22.050kHz 32kHz 40kHz 44.1kHz 48kHz 96kHz
4.2.7 DAC Digital Gain
A digital gain stage inside the DAC varies from -24dB to 21.5dB,see as below, there is also a fine gain interface with 9-bit gain setting enabling gain changes in 1/32 steps. The overall gain control of the ADC is controlled by the firmware. Its setting is a combined function of the digital and analogue amplifier settings
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4.2.8 DAC Analogue Gain
As below shows that the DAC analogue gain stage consists of 8 gain selection values that represent seven 3dB steps The firmware controls the overall gain control of the DAC. Its setting is a combined function of the digital and analogue amplifier settings
4.2.9 IEC 60958 Interface
The IEC 60958 interface is a digital audio interface that uses bi-phase coding to minimize the DC content of the transmitted signal and enables the receiver to decode the clock information from the transmitted signal. The IEC 60958 specification is based on the 2 industry standards: AES3(also known as AES/EBU) Sony and Philips interface specification SPDIF The interface is compatible with IEC 60958-1, IEC 60958-3 and IEC 60958-4 The SPDIF interface signals are SPDIF-IN and SPDIF-OUT and are shared on the PCM interface pin.
4.2.10 Microphone Input
BTM8670contains 2 independent low-noise microphone bias generators. The microphone bias generators are recommended for biasing electro condenser microphones. A biasing circuit for microphones with a sensitivity between about -40dB to -60dB(0dB=1V/Pa)
4.2.11 Digital Microphone Inputs
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4.2.13 Audio Output Stage
The output digital circuitry converts the signal from 16-bit per sample, linear PCM of variable sampling frequency to a 2Mbits/sec multi-bit stream, which is fed into the analogue output circuitry. The output circuit comprises a digital to analogue converter with gain setting and output amplifier. Its class-AB output-stage is capable of driving a signal on both channels of up to 2V pk-pk-differential into a load of 16 . The output is available as a differential signal between SPK_R_RP and SPK_R_RN for the left channel; and between SPK_L_LP and SPK_L_LN for the right channel. The output is capab le of driving a speaker directly if its impedance is at least 8 if only one channel is connected or an external regulator is used. The gain of the output stage is controlled by a 3-b it programmable resistive divider, which sets the gain in steps of approximately 3dB. The multi-bit stream from the digital circuitry is low pass filtered by a second order bi-quad filter with a pole at 20kHz. The signal is then amplified in the fully differential output stage, which has a gain bandwidth of typical ly 1MHz.
4.3 PCM Interface
The audio PCM interface on the BTM8670 supports: On-chip routing to Kalimba DSP Continuous transmission and reception of PCM encoded audio data over Bluetooth. Processor overhead reduction through hardware support for continual transmission and reception of PCM data A bidirectional digital audio interface that routes directly into the baseband layer of the firmware .It does not pass through the HCI protocol layer. Hardware on the BTM8670 for sending data to and from a SCO connection. Up to 3 SCO connections on the PCM interface at any one time. PCM interface master, generating PCM_SYNC and PCM_CLK. PCM interface slave, accepting externally generated PCM_SYNC and PCM_CLK. Various clock formats including: Long Frame Sync Short Frame Sync GCI timing environments 13-bit or 16-bit linear, 8-bit u-law or A-law compander sample formats. Receives and transmits on any selection of 3 the first 4 slots following PCM_SYNC. The PCM configuration options are enabled by setting the PS Key PSKEY_PCM_CONFIG32.
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4.4 Digital Audio Interface(I2S)
The digital audio interface supports the industry standard formats for I2S,left-justified or right-justified. The interface shares the same pins as the PCM interface ,which means each audio bus is mutually exclusive in its usage. Table as below lists these alternative functions
4.5 RF Interface
The module integrates a balun filter. The user can connect a 50ohms antenna directly to the RF port.
4.6 General Purpose Analog IO
The general purpose analog IOs can be configured as ADC inputs by software. Do not connect them if not use.
4.7 General Purpose Digital IO
There are nine general purpose digital IOs defined in the module. All these GPIOs can be configured by software to realize various functions, such as button controls, LED displays or interrupt signals to host controller, etc. Do not connect them if not use.
4.8 Serial Interfaces
4.8.1 UART
This is a standard UART interface for communicating with other serial devices. The UART interface provides a simple mechanism for communicating with other serial devices using the RS232 protocol. When the module is connected to another digital dev ice, UART_RX and UART_TX transfer data between the two devices. The remaining two signals, UART_CTS and UART_RTS, can be used to implement RS232 hardware f low control where both are active low indicators. Note: The serial port interface(UART)can be used fo r system debugging. Don’t support to use command set for profile function app lication by UART, such as HFP/A2DP/AVRCP and so on. These profiles function a pplication can be controlled only by PIO, such as pairing/connect/answer/play/pa use/next/previous function application and so on.
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4.8.2 I2C Interface
As this I2C interface is software-driven it is suit ed to relatively slow functions such as driving a dot matrix LCD, keyboard scanner or EEPRO M. If it is not used, then PIO[7:6] are available to form a software-driven master I2C interface.
4.8.3 SPI
The synchronous serial port interface (SPI) can be used for system debugging. It can also be used for in-system programming for the flash memory within the module. SPI interface uses the SPI_MOSI, SPI_MISO, SPI_CSB and SPI_CLK pi ns. Testing points for the SPI interface are reserved on board in case that the fi rmware shall be updated during manufacture. The module operates as a slave and thus SPI_MISO is an output of the module. SPI_MISO is not in high-impedance state when SPI_CS B is pulled high. Instead, the module outputs 0 if the processor is running and 1 if it is stopped. Thus the module should NOT be connected in a multi-slave arrangeme nt by simple parallel connection of slave SPI_MISO lines. Figure 6
http://www.buddies-tech.com BTM8670 DATASHEET (!"! 5.1 Absolute Maximum Ratings Rating Min Max Unit Storage temperature -40 105 Supply Voltage 5V(USB VBUS) VCHG -0.4 5.75 V SMPS_3V3 -0.4 3.60 V 3.3V VDD_USB -0.4 3.60 V LED[2:0] -0.4 4.40 V SMP_VBAT -0.4 4.40 V -0.4 5.75 V Battery VREGENABLE -0.4 4.40 V VDD_AUDIO_DRV -0.4 1.95 V VDD_AUX_1V8 -0.4 1.95 V VDD_PADS_1 -0.4 3.60 V VDD_PADS_2 -0.4 3.60 V VDD_PADS_3 -0.4 3.60 V 1.8V SMPS_1V8_SENSE -0.4 1.95 V SMPS_1V35_SENSE -0.4 1.45 V VDD_AUDIO -0.4 1.45 V 1.35V VREGIN_DIG -0.4 1.95 V Other terminal voltages VSS - 0.4 VDD + 0.4 V Table 1
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5.2 Recommended Operating Conditions
Operating temperature range -40 Supply Voltage VCHG 4.75 / 3.10 5.00 5.75 V SMPS_3V3 3.10 3.30 3.60 V 3.3V VDD_USB 3.10 3.30 3.60 V LED[2:0] 1.10 3.70 4.25 V SMP_VBAT 2.50 3.70 4.25 VBAT_SENSE 0 3.70 4.25 V Battery VDD_AUDIO_DRV 1.70 1.80 1.95 V VDD_AUX_1V8 1.70 1.80 1.95 V VDD_PADS_1 1.70 1.80 3.60 V VDD_PADS_2 1.70 1.80 3.60 V VDD_PADS_3 1.70 1.80 3.60 1.8V SMPS_1V8_SENSE 1.70 1.80 1.95. V SMPS_1V35_SENSE 1.30 1.35 1.40 V VDD_AUDIO 1.30 1.35 1.40 V 1.35V VREGIN_DIG 1.30 1.35 or 1.80 1.95 V Table 2
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5.3 Input/output Terminal Characteristics
5.3.1 Codec: Analogue to Digital Converter
Analogue to Digital Converter Parameter Conditions Mi Typ Max Uni Resolution Bits Input Sample Rate, F kHz Fsample 8kHz dB 16kHz dB 32kHz dB 44.1kHz dB SNR fin = 1kHz B/W = 20HzFsample/2 (20kHz max) A-Weighted 48kHz dB Fsample 8kHz 0.004 THD+N fin = 1kHz B/W = 20HzFsample/2 (20kHz max) 48kHz 0.008 Digital gain Digital gain resolution = 1/32 -24 21.5 dB Analogue gain Pre-amplifier setting = 0dB, 9dB, 21dB or 30dB Analogue setting = -3dB to 12dB in 3dB steps dB Stereo separation(crosstalk) -89 dB Table 3
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5.3.2 Codec:
Digital to Analogue Converter Digital to Analogue Converter Parameter Conditions Mi Typ Max Uni Resolution Bits Output Sample Rate, Fsample kHz Fsample Load 48kHz 100k dB 48kHz dB SNR fin = 1kHz B/W = 20Hz20kHz A-Weighted THD+N < 0.1% 48kHz dB Fsample Load 8kHz 100k 0.002 8kHz 0.002 8kHz 0.003 48kHz 100k 0.003 48kHz 0.003 THD+N fin = 1kHz B/W = 20Hz20kHz 0dBFS input 48kHz 0.004 Digital Gain Digital Gain Resolution = 1/32 -24 21.5 dB Analogue Gain Analogue Gain Resolution = 3dB -21 dB Stereo separation(crosstalk) -88 dB Table 4
http://www.buddies-tech.com BTM8670 DATASHEET The soldering profile depends on various parameters necessitating a set up for each application. The data here is given only for guida nce on solder reflow. Figure 7
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