Microchip BM7X Low-Power Bluetooth Module Performance

The BM70/71 modules from Microchip are Bluetooth Low Energy solutions for embedded applications, compliant with the top Bluetooth V.4.2 specifications, enhancing throughput and security for IoT applications, and using beacon technology to enhance user experience with IoT. Operating frequency is ISM 2.402GHz-2.480GHz, 0-39 channels, with a receiving sensitivity of -90dBm (LE) and a maximum transmitting power of +2dBm.

BM70/71 Bluetooth 4.2 Low Energy Module Features

• Compliant with Bluetooth SIG 4.2 standards

• Certified by FCC, IC, MIC, KCC, NCC, and SRRC radio regulations

• Radio module evaluated under European R&TTE directives

• Compliant with RoHS standards

• Supports UART, I2C, and SPI interfaces

• Supports transparent UART data service for BLE

• Built around Microchip IS187x SoC

• BM70 supports 3-channel PWM, BM71 supports 1-channel PWM

• High-precision temperature sensor operational range from -20°C to +70°C, with an accuracy of ±3°C

• 12-bit ADC (ENOB = 10/8 bits) supports battery and voltage detection

• Provides 8-channel ADC (for BM70) and 5-channel ADC (for BM71)

• 18 general-purpose I/O pins (BM70) and 9 general-purpose I/O pins (BM71)

• Integrated 32 MHz crystal oscillator

• Compact surface-mount module

• Notched SMT pads for simple and reliable PCB mounting

RF Characteristics

• Operates in the ISM band from 2.402 GHz to 2.480 GHz

• Channels: 0-39

• Receiving sensitivity: typical value of -90 dBm (LE)

• Transmitting power: 0 dBm (typical value)

• Received signal strength indicator monitor with 1 dB resolution

Application Areas

• Internet of Things (IoT)

• Payment/Security

• Wearable Devices

• Home and Security

• Health and Fitness

• Beacons and Industrial Data Collection, etc.

The BM78 transparent dual-mode Bluetooth module integrates the underlying Bluetooth protocol (no need to write Bluetooth protocol separately), allowing direct application configuration and transparent transmission of MCU data to the APP. It supports both Android and Apple dual systems and dual modes, supporting BLE 4.2 + SPP 3.0 + IAP protocols, making it compatible with most mobile phones on the market. It is currently the Bluetooth module with the highest compatibility shipment, selected by LaKaLa POS machines, Tencent’s Lubaobox, and Jiuan Medical. The Bluetooth module can connect to iOS (iPhone 4S, New iPad, etc., with Bluetooth 4.2 BLE interface) or other OS (Android, Win 8, etc.) applications via Bluetooth 3.0 serial communication protocol or Bluetooth 4.2 communication protocol, achieving control and data collection of accessory products via the APP.

This module is primarily used in the field of short-distance wireless data transmission, allowing easy connection with Bluetooth devices on PCs, as well as data interchange between two modules, avoiding cumbersome cable connections and directly replacing serial cables.

BM78 Transparent Dual-Mode Bluetooth Module Features

• Supports standard BT3.0 + EDR + BLE4.2

• Supports standard BLE protocol

• Supports SPP protocol

• Supports UART, I2C interfaces

• Supports low-power mode

• Supports Bluetooth Class1 and Class2 modes

• Supports 11 GPIO multiplexing

• Industrial-grade design

• Data encryption

• Built-in PCB antenna

• Input voltage 3.3V-4.2V

• Bluetooth certification: FCC, IC, CE, NCC, KCC, MIC (Japan)

Application Areas

• Building automation, security, wireless monitoring of server room equipment, access control systems

• Wireless keyboard, mouse, joystick, Bluetooth game controller

• Bluetooth printers, POS systems

• Smart home, industrial control

• Wireless LED display systems

• Bluetooth wireless data transmission

• Automated data collection systems, etc.

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