Product Technical Specification BC127, BC127-HD, BC127-EXT 41110693 Rev 1
Product Technical Specification Important Notice Safety and Hazards Due to the nature of wireless communications, transmission and reception of data can never be guaranteed. Data may be delayed, corrupted (i.e., have errors) or be totally lost.
Preface Patents This product may contain technology developed by or for Sierra Wireless Inc. This product includes technology licensed from QUALCOMM®. This product is manufactured or sold by Sierra Wireless Inc. or its affiliates under one or more patents licensed from InterDigital Group and MMP Portfolio Licensing. Copyright Trademarks © 2017 Sierra Wireless. All rights reserved.
Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Key Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 RF Specifications . . . . . . . . . . . . . . .
Contents BC127 and BC127-HD With External Supply . . . . . . . . . . . . . . . . . . . . . . . 26 Boot Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 BC127/BC127-HD/BC127-EXT to Wake-Up an External Processor on Connection 27 Power Supply Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 GPIO Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 1: Introduction The BC127/BC127-HD/BC-127EXT is a highly flexible, low power, small form factor Bluetooth Audio module. The BC127, BC127HD, and BC127-EXT are Bluetooth Version 4.2 Certified. The model comes preloaded with Sierra Wireless Melody software, and is ideal for developers who want to quickly and cost effectively integrate Bluetooth functionality into their products. Figure 1-1: BC127 Note: this is an example image and does not represent the label used on commercial shipments.
Introduction Figure 1-3: BC127-EXT Flow Diagram Applications • • • • • • Wireless Speakers, Docks and Headsets SmartPhone Controlled Audio Systems Automotive Infotainment Systems Medical Devices High Quality Audio Streaming Gaming Accessories and MP3 Players Key Specifications • • • • • • • • • • Bluetooth Certified 4.2 Audio module Dual Mode: Bluetooth and Bluetooth Low Energy (BLE) Backwards compatible with 1.1, 2.0, 2.1 + EDR and 3.
Product Technical Specification General Specifications Table 1-1: General Specifications Specification Description Bluetooth Standard Bluetooth 4.2 Class 2 Interfaces UART, AIO, GPIO, USB, SPI, Audio In, Mic In, PCM, I2S, SPDIF, I2C Size 11.8mm x 18mm x 3.2mm Weight 1.1g RF Specifications Table 1-2: RF Specifications Specification Description Frequency Band 2,402 MHz to 2,480 MHz Modulation 8 DPSK, PI/4 DQPSK, GFSK Maximum Data Rate 3Mbps (typical 1.
Introduction Electric Specifications Table 1-4: Electrical Specifications Specification Description Supply Voltage 3.3V to 4.7 V DC (supports Li-ion battery voltage range) Typical Current 15mA (music streaming) Typical Current Idle <1mA (connectable) Operating Temperature -40°C to 85°C Storage Temperature -40°C to 105°C Product Models Table 1-5: Model Names Models Description BC127 Class2 Bluetooth 4.2 Module with integrated chip antenna BC127-EXT Class2 Bluetooth 4.
2: Physical Characteristics Module Footprint Figure 2-1: Module Footprint Rev 1 Apr.
Physical Characteristics Placement Considerations Figure 2-2: Placement Layout Rev 1 Apr.
3 3: Audio Circuit The Audio circuit consists of: • • two independent 16-bit high-quality ADC channels: · Programmable as either microphone or line input · Programmable as either stereo or dual-mono input · Multiplexed with two of the digital microphone inputs · Each channel is independently configurable to be either single-ended or fully differential · Each channel has an analog and digital programmable gain stage A dual differential class A-B output stage.
Audio Circuit Pin Descriptions Table 3-1: Pin Descriptions for the BC127/BC127-HD/BC127EXT No Rev 1 Apr.
Product Technical Specification Table 3-1: Pin Descriptions for the BC127/BC127-HD/BC127EXT No Pin Name Pin Type Pin Description 28 VREGEN Analogue Take High to Enable Switch-Mode Regulator 29 CHG_EXT Charger input External battery charger control 30 VCHG Charger input Battery Charger Input 31 VBAT_SENSE Battery Sense Battery Charger Sense 32 VBAT Battery terminal +ve Battery Positive 33 VDD_PADS Supply Positive Supply input 34 3V3_USB Supply Positive Supply output 35 USB_N
Audio Circuit Table 3-2: Additional Pins on the BC127-EXT No Pin Name Pin Type Pin Description 53 BT RF BT RF BT RF 54 GND GND Common Ground Notes • • • • • Rev 1 Apr.17 PIO_X are bidirectional with weak pull down Reset Input is with strong pull-up USB data positive with selectable internal 1.5kΩ pull up resistor UART are bidirectional with weak pull up PCM_OUT, IN, SYNC, and CLK can be used as SPI_MISO, MOSI, CSB, and CLK respectively.
4 4: Hardware Design Guidelines BC127/BC127-HD with a Battery Figure 4-1: Hardware Design Note 1. VREGEN should be driven high 5ms after VBAT is applied to boot the module. Referring to the figure above, a Li-ion battery is connected to VBAT and VBUS from an external USB source is connected to VCHG. It is assumed that the VBUS supply is not connected permanently but periodically. Table 4-1: Pin Voltages Net Min Typ Max VCHG 3.1V*/4.75V 5V 5.75V VBAT_SENSE 2.8V 3.7V 4.25V VBAT 2.8V 3.7V 4.
Hardware Design Guidelines VCHG is the input to the battery charger regulator. VBAT_SENSE is the input to the Battery sensor circuitry. VBAT is the main supply input to the internal switch mode and LDO regulators and is the supply domain for VREGEN. VDD_PADS is the supply to all the I/O domains for PIO, UART, PCM, LED and RST#. Boot Modes The module will boot automatically whenever a voltage greater than 3.1V is applied to VCHG (for example, when a USB source is plugged in).
Product Technical Specification Figure 4-2: Circuit to Support Discharged Battery Starting If the voltage of the battery is below 2.9V, the charger will enter ‘trickle charge mode’, when in this mode, the battery is charged at a current of a few milliamps in order to safely charge deeply discharged batteries. Once the voltage of the battery reaches anything above 2.9 V, fast charging mode will be used.
Hardware Design Guidelines Figure 4-3: BC128 for Extended Range Role of VREG Once the module is booted, VREGEN acts like a standard PIO. The function of VREGEN can be configured. Please refer to the Melody Manual for the VREGEN function once the module is booted. ESD protection The module has no supplementary ESD protection other than that provided by the IC within the module.
Product Technical Specification Role of VREG Once the module is booted, VREGEN acts like a standard PIO. The function of VREGEN can be configured. Please refer to the Melody Manual for the VREGEN function once the module is booted. Connection Microphones A stereo microphone example schematic is shown in Figure 4-4: Figure 4-4: Stereo Microphone Example Schematic Mono Microphone Example Schematic Figure 4-5: Mono Microphone Example Schematic Rev 1 Apr.
Hardware Design Guidelines The left channel is used for mono operation, leave the right channel unconnected. For dual mono operation the right channel forms the auxiliary channel; connect as per stereo example schematic. By default mic bias will go high for a hands-free and for a music connection. The behavior of Mic Bias can be configured. Please refer to the Melody UART manual for configuration options. Mic bias is 2.6V and can source up to 2.8mA of current. Melody fixes it at a certain voltage.
Product Technical Specification An example USB supply configuration is shown Figure 4-6: Figure 4-6: Example USB Supply Configuration The BC127/BC127-HD/BC127-EXT Discovery Board and the BC127/BC127-HD/ BC127-EXT Development Board use an external amplifier for audio application demonstration purposes. For superior audio performance always follow the design and layout guidelines provided by the amplifier manufacturer.
Hardware Design Guidelines No two audio amplifiers are the same so it is important to ensure that you follow the design recommendations provided by the supplier of the amplifier. When connecting to external devices such as laptops in a “line In” configuration, there is a possibility that the sleeve of the audio cable can carry noise derived from the laptop.
Product Technical Specification External Speaker Connections In some versions of the BC127/BC128, the speaker lines SPKR_LN, SPKR_LP, SPKR_RN & SPKR_RP were internally DC blocked by 100nF capacitors on the module. This limited the low frequency response of the audio output. A new BC127 (V4 and above still to be released) will have these capacitors removed. So external series capacitors are now required on the four audio output lines mentioned above.
Hardware Design Guidelines GPIO and UART The BC127/BC127-HD/BC127-EXT is controlled by GPIOs. This can be configured. If GPIO control is not used, these GPIOs should be left floating. The UART by default does not use RTS/CTS flow control. If the users do not expect to use it, these lines should be left floating. Digital Pin States on Reset or After Power Up The following table shows the Digital Pin States on Reset or after power up.
Product Technical Specification Table 4-3: Input and Tri-state Currents Input and Tri-state Currents Min Typ Max Unit Strong pull-up -150 -40 -10 µA Strong pull-down 10 40 150 µA Weak pull-up -5 -1.0 -0.33 µA 0.33 1.0 5.0 µA Weak pull-down BC127 and BC127-HD With External Supply Figure 4-10 shows an example of a fixed voltage configuration. Figure 4-11: Example of Fixed Voltage Configuration Referring to Figure 4-11 above, a 3.
Hardware Design Guidelines VDD_PADS is the supply to all the I/O domains for PIO, UART, PCM, LED and RST#. Boot Modes Application of a voltage greater than 3.1V correctly boots the module, the module can be powered down by removing the fixed supply voltage or by pulling VREGEN low. If the fixed supply voltage remains, restart the module by pulling VREGEN high.
5: Power Supply Sequencing VBAT and VDD_PADS should be driven high at the same time, VREGEN must be delayed by at least 5ms before driving high to enable the module. RST# should be driven low for at least 20ms to reset the module. It is not necessary to reset the module post power up. Figure 5-1: Power Supply Sequencing The VBAT ramp should be monotonic, any dips in the VBAT ramp in the region of 1.6 to 3.1V may cause the module to power up incorrectly.
6 6: GPIO Electrical Specifications Table 6-1: Input and Tri-state Currents Input and Tristate Currents Rev 1 Apr.17 41110693 Min Typ Max Unit Strong pull-up -150 -40 -10 µA Strong pulldown 10 40 150 µA Weak pull-up -5 -1.0 -0.33 µA Weak pulldown 0.33 1.0 5.
7: Solder Reflow Profile The solder profile is described below. Figure 7-1: Solder Profile Zone A: Preheat: This raises the temperature at a controlled rate, typically 0.5 - 2C/s. This will preheat the component to 120°C to 150°C to distribute the heat uniformly to the PCB. Zone B: Equilibrium1: In this zone, the flux becomes soft and uniformly spreads solder particles over the PCB board, preventing re-oxidisation. The recommended temperature for this zone is 150°C to 200°C for 60s to 120s.
A: Regulatory Certifications Caution: Unauthorized modifications or changes not expressly approved by Sierra Wireless could void compliance with regulatory rules, and thereby your authority to use this equipment.
Product Technical Specification Canada IC The BC127/BC127-HD/BC127-EXT module, upon commercial release, will have been granted modular approval by IC. Integrators may use the BC127/BC127-HD/ BC127-EXT module in their end products without additional IC certification if the following conditions are met. • At least 20 cm separation distance between the antenna and the user’s body must be maintained at all times.
B: Packaging Dimensions Main Box Dimensions Figure 2-1: Main Box Dimensions • • • • Rev 1 Apr.
Product Technical Specification Inside Tape and Reel Dimensions Figure 2-2: Inside Tape and Reel Dimensions • • • • • • Rev 1 Apr.17 C1=330mm A=2.5mm B=11mm H=56.8mm I=2.25mm D=99.
