Last Updated on : 2023-09-14 02:18:33download
This topic describes Tuya’s proprietary BTU-IPEX Bluetooth Low Energy (LE) module. It consists of a highly integrated Bluetooth chip TLSR8250 and a few peripheral circuits. It has built-in Bluetooth protocol stacks and a rich set of library functions.
BTU-IPEX module is built around a 32-bit microcontroller unit (MCU) with 4 Mbits flash and 48 KB SRAM. The embedded 2.4 GHz transceiver supports Bluetooth 5.
The BTU-IPEX module has three rows of pins with a 1.4±0.1 mm pin spacing. The BTU-IPEX dimensions are 16.3±0.35 mm (L) × 15.8±0.35 mm (W) × 3.0±0.15 mm (H).
The following figure shows the dimensions and packaging design of the BTU-IPEX module.
|Pin No.||Symbol||I/O type||Description|
|1||D3||I/O||GPIO pin, corresponding to D3 (Pin 32) on the IC.|
|2||D7||I/O||GPIO pin, corresponding to D7 (Pin 2) on the IC.|
|3||C0||I/O||GPIO pin, corresponding to C0 (Pin 20) on the IC.|
|4||SWS||I/O||Used for firmware flashing, corresponding to SWS (Pin 5) on the IC.|
|5||B6||I||ADC pin, corresponding to B6 (Pin 16) on the IC.|
|6||A0||I/O||GPIO pin, corresponding to A0 (Pin 3) on the IC.|
|7||A1||I/O||GPIO pin, corresponding to A1 (Pin 4) on the IC.|
|8||C2||I/O||Support hardware PWM, corresponding to C2 (Pin 22) on the IC.|
|9||C3||I/O||Support hardware PWM, corresponding to C3 (Pin 23) on the IC.|
|10||D2||I/O||Support hardware PWM, corresponding to D2 (Pin 31) on the IC.|
|11||B4||I/O||Support hardware PWM, corresponding to B4 (Pin 14) on the IC.|
|12||B5||I/O||Support hardware PWM, corresponding to B5 (Pin 15) on the IC.|
|14||VCC||P||Power supply pin (3.3V).|
|17||C4||I/O||ADC pin, corresponding to C4 (Pin 24) on the IC.|
|18||RST||I/O||Reset pin. Active low.|
|19||C1||I/O||GPIO pin, corresponding to C1 (Pin 21) on the IC.|
|20||D4||I/O||GPIO pin, corresponding to D4 (Pin 1) on the IC.|
P indicates the power pin, and I/O indicates the input and output pin.
|Parameter||Description||Min value||Max value||Unit|
|Electrostatic discharge voltage (human body model)||TAMB-25°C||-||2||kV|
|Electrostatic discharge voltage (machine model)||TAMB-25°C||-||0.5||kV|
|Parameter||Description||Min value||Typical value||Max value||Unit|
|VIL||I/O low-level input||VSS||-||VCC × 0.3||V|
|VIH||I/O high-level input||VCC × 0.7||-||VCC||V|
|VOL||I/O low-level output||VSS||-||VCC × 0.1||V|
|VOH||I/O high-level output||VCC × 0.9||-||VCC||V|
|Itx||Continuous transmission, with an output power of 11.5 dBm||22.6||mA|
|IDC||Average value when connected over Bluetooth mesh||6.59||mA|
|IDC||Peak value when connected over Bluetooth mesh||24.9||mA|
|Ideepsleep1||Deep sleep mode (16 KB RAM reserved)||1.2||μA|
|Ideepsleep2||Deep sleep mode (RAM not reserved)||0.4||μA|
|Operating frequency||2.4 GHz ISM band|
|Wireless standard||Bluetooth LE 4.2/5.0|
|Data transmission rate||1 Mbit/s and 2 Mbit/s|
|Antenna type||External FPC antenna|
|Parameter||Min value||Typical value||Max value||Unit|
|RF average output power||-21||10||11.5||dBm|
|Bandwidth of 20 dB modulation signal (1 Mbit/s)||-||2500||-||kHz|
|Parameter||Min value||Typical value||Max value||Unit|
|RX sensitivity 1 Mbit/s||-||-94.5||-||dBm|
|Frequency offset error 1 Mbit/s||-250||-||+300||kHz|
|Co-channel interference suppression||-||-||-10||dB|
The TLSR8250 chip has requirements for the power-up sequence. During the power-up process, the system begins to start after the RST pin reaches 1.62V. At this time, the VDD pin needs to reach above 1.8V within 10 ms. The RST pin has an RC link. When the RST pin reaches 1.62V, the VDD pin of the bare module has far exceeded 1.8V.
If the power driver connected to a module with a TLSR8250 chip is charged and discharged by a large capacitor, and the module voltage is not fully discharged below 0.6V, the module might crash when restarted. The
VDD_3.3V power supply pin of the module needs to be connected to a 1K dummy load to speed up discharge. The figure below shows part of the power drive link for your reference.
BTU-IPEX uses an external FPC antenna, paired with a first-generation IPEX antenna mount, with an antenna gain of 1.5 dBi.
FPC-IPEX antenna is recommended. The following figure is for your reference.
When the IPEX external antenna is fixed, the distance between the antenna and other mental components should be at least 15 mm to provide the best radiation performance. Make sure that the enclosure surrounding the antenna is not metal materials. Otherwise, the radiation performance might be degraded. It is recommended to hollow out the breakout board around the antenna area.
The PCB dimensions are 16.3±0.35 mm (L) × 15.8±0.35 mm (W) × 1.0±0.1 mm (H).
For the modules that can be packaged with the surface-mount technology (SMT) or in in-line form, you can select either of them according to the PCB design solutions of customers. If a PCB is designed to be SMT-packaged, package the module with the SMT. If a PCB is designed to use an in-line package, use wave soldering. Complete soldering within 24 hours after the module is unpacked. Otherwise, we recommend that you place the module in a drying cupboard with a relative humidity level below 10%, or pack the module in vacuum again. Then, record the packing time and duration of exposure. The total exposure time cannot exceed 168 hours.
A delivered module must meet the following storage requirements:
The moisture-proof bag must be placed in an environment where the temperature is below 40°C and the relative humidity is lower than 90%.
The shelf life of a dry-packaged product is 12 months from the date when the product is packaged and sealed.
A humidity indicator card (HIC) is put in the sealed package.
The module needs to be baked in the following cases:
The baking parameter settings are described below:
In the whole production process, take electrostatic discharge (ESD) protective measures.
To guarantee the pass rate, we recommend that you use the SPI and AOI to monitor the quality of solder paste printing and mounting.
Select a proper soldering technique according to the process. For more information, refer to the recommended oven temperature curve of either reflow soldering or wave soldering. The set temperatures might deviate from the actual temperature measurements. All temperatures shown in this module datasheet are obtained through actual measurements.
Technique 1: SMT process (recommended oven temperature curve of reflow soldering)
Set the oven temperatures according to the following curve.
A: temperature axis
B: time axis
C: alloy liquidus temperature from 217°C to 220°C
D: ramp-up slope from 1°C/s to 3°C/s
E: keep a constant temperature from 150°C to 200°C for a time period of 60s to 120s
F: temperature above liquidus temperature for 50s to 70s
G: peak temperature from 235°C to 245°C
H: ramp-down slope from 1°C/s to 4°C/s
The curve above is based on solder paste SAC305. For more information about other solder pastes, see the recommended oven temperature curve in the specified solder paste specifications.
Technique 2: Wave soldering process (oven temperature curve of wave soldering)
Set the oven temperatures according to the following temperature curve of wave soldering. The peak temperature is 260°C±5°C.
|Suggestions on wave soldering||Suggestions on manual repair soldering|
|Preheat temperature||80°C to 130°C||Soldering temperature||360°C ± 20°C|
|Preheat duration||75s to 100s||Soldering duration||Less than 3s/point|
|Contact duration at the peak||3s to 5s||N/A||N/A|
|Solder tank temperature||260 ± 5°C||N/A||N/A|
|Ramp-up slope||≤ 2°C/s||N/A||N/A|
|Ramp-down slope||≤ 6°C/s||N/A||N/A|
|Product model||MOQ (pcs)||Shipping packaging||Modules per reel||Reels per carton|
|BTU-IPEX||4,400||Tape and reel||1,100||4|
FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate this device.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Note: This device has been tested and found to comply with the limits for a Class B digital device, according to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This device generates, uses, and can radiate radio frequency energy and, if not installed and used following the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation.
If this device does cause harmful interference to radio or television reception, which can be determined by turning the device off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
Radiation Exposure Statement
This device complies with FCC radiation exposure limits set forth for an uncontrolled rolled environment. This device should be installed and operated with a minimum distance of 20cm between the radiator and your body.
This radio module must not be installed to co-locate and operate simultaneously with other radios in the host system except following FCC multi-transmitter product procedures. Additional testing and device authorization may be required to operate simultaneously with other radios.
The availability of some specific channels and/or operational frequency bands are country-dependent and are firmware programmed at the factory to match the intended destination. The firmware setting is not accessible to the end-user.
The host product manufacturer is responsible for compliance with any other FCC rules that apply to the host not covered by the modular transmitter grant of certification. The final host product still requires Part 15 Subpart B compliance testing with the modular transmitter installed.
The end-user manual shall include all required regulatory information/warnings as shown in this manual, including “This product must be installed and operated with a minimum distance of 20 cm between the radiator and user body”.
This device has got an FCC ID: 2ANDL-BTU-IPEX. The end product must be labeled in a visible area with the following: “Contains Transmitter Module FCC ID: 2ANDL-BTU-IPEX”.
This device is intended only for OEM integrators under the following conditions:
The antenna must be installed such that 20cm is maintained between the antenna and users, and the transmitter module may not be co-located with any other transmitter or antenna.
As long as the 2 conditions above are met, further transmitter tests will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed.
Declaration of Conformity European Notice
Hereby, Hangzhou Tuya Information Technology Co., Ltd declares that this module product is in compliance with essential requirements and other relevant provisions of Directive 2014/53/EU,2011/65/EU. A copy of the Declaration of Conformity can be found at https://www.tuya.com.
This product must not be disposed of as normal household waste, in accordance with the EU directive for waste electrical and electronic equipment (WEEE-2012/19/EU). Instead, it should be disposed of by returning it to the point of sale, or to a municipal recycling collection point.
The device could be used with a separation distance of 20cm from the human body.
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