MICROCHIP RN4020-V/RM123 BLUETOOTH MODULE, V4.1, 1MBPS

The MICROCHIP RN4020-V/RM123 is a compact Bluetooth Low Energy module implementing the Bluetooth 4.1 specification with 1 Mbps data rate, designed for embedded systems requiring wireless connectivity with minimal power consumption. Professional embedded systems engineers, IoT developers, and wearable device manufacturers rely on this module to establish reliable short-range wireless communication in battery-constrained applications. This module solves the critical challenge of integrating certified Bluetooth connectivity into custom PCBs without requiring extensive RF design expertise or FCC certification overhead.

Product Overview

The RN4020-V/RM123 operates as a standalone Bluetooth Low Energy transceiver module that communicates with host microcontrollers via UART, SPI, or I2C interfaces. The module integrates a complete Bluetooth 4.1 stack with an ARM Cortex M0 processor, antenna, RF front-end, and power management circuitry into a single 23x28mm form factor. Operating across the 2.4 GHz ISM band with frequency hopping spread spectrum technology, it achieves robust communication with interference immunity and regulatory compliance across global markets including FCC, CE, and IC certifications.

The RN4020-V/RM123 distinguishes itself through ultra-low power consumption in idle mode (under 2 microamps), making it ideal for battery-powered applications requiring months or years of operation on single-cell coin batteries. The module supports both master and slave roles, enabling flexible network topologies for point-to-point or mesh networking scenarios. Advanced power management features including sleep modes, configurable advertising intervals, and connection parameter optimization allow developers to fine-tune power consumption based on specific application requirements while maintaining responsive connectivity.

Key Specifications

Specification	Details
Product Type	Bluetooth Low Energy Module
Brand	Microchip Technology
Origin	Original/Authentic
Warranty	7 days on manufacturing defects
Shipping	1-5 days from Bengaluru
Delivery	7-8 days across India
Support	24/7 via Email and WhatsApp
Bluetooth Version	Bluetooth 4.1 Low Energy
Data Rate	1 Mbps
Operating Frequency	2.4 GHz ISM Band
Transmit Power	0 dBm nominal
Receive Sensitivity	-95 dBm
Idle Current	Less than 2 microamps
Module Dimensions	23 x 28 mm
Interface	UART, SPI, I2C
Operating Voltage	2.0V to 3.6V
Temperature Range	-40°C to +85°C

Key Features

• Bluetooth 4.1 Low Energy certified stack with full protocol implementation eliminating need for external certification
• Ultra-low idle current consumption below 2 microamps enabling multi-year battery life in wearables and remote sensors
• Integrated antenna with impedance matching network providing reliable -95 dBm receive sensitivity and 0 dBm transmit power
• Flexible interface options supporting UART at up to 230400 baud, SPI, and I2C for seamless integration with any microcontroller
• Dual role operation supporting both central and peripheral modes for master-slave or peer-to-peer network configurations
• Comprehensive command set via transparent serial interface allowing firmware updates and real-time parameter configuration

Applications and Use Cases

• Wearable fitness trackers and health monitoring devices requiring months of operation on coin cell batteries with real-time data synchronization
• IoT sensor networks including temperature, humidity, and motion sensors transmitting periodic readings to central hub or smartphone gateway
• Industrial asset tracking and inventory management systems using Bluetooth beacons for indoor positioning and proximity detection
• Medical devices such as blood glucose monitors, pulse oximeters, and patient alert systems requiring reliable wireless connectivity with medical-grade reliability
• Smart home automation peripherals including wireless door locks, lighting controllers, and environmental sensors communicating with central hub
• Portable test and measurement instruments requiring wireless data logging and remote parameter adjustment via mobile applications

How to Use

Begin by connecting the RN4020-V/RM123 module to your host microcontroller using a standard UART interface at 115200 baud rate (default). Apply 3.3V regulated power supply with minimum 100 microfarad decoupling capacitor placed within 10mm of the VCC pin to ensure stable operation. The module enters command mode upon power-up, allowing you to configure device name, advertising parameters, and connection settings using ASCII command strings sent through the serial port. Refer to the RN4020 command reference documentation for complete AT-command syntax and configuration options.

After initial configuration, place the module in advertise mode to broadcast its presence to nearby Bluetooth devices. When a central device initiates connection, the module automatically enters connected state and routes all incoming serial data to the remote device while forwarding received wireless packets to your microcontroller. Implement your application logic in the host microcontroller to parse incoming data, execute commands, and transmit responses back through the serial interface. Use the module's power management commands to enter sleep states during idle periods, waking only when connection requests arrive or at programmed intervals for periodic data transmission.

Frequently Asked Questions

What is the maximum range of the RN4020-V/RM123 module?

The RN4020-V/RM123 achieves typical range of 50-100 meters in open space depending on antenna orientation, environmental obstacles, and transmit power settings. In indoor environments with walls and interference, practical range reduces to 20-50 meters. Range can be extended by increasing transmit power or implementing multi-hop mesh networking where intermediate nodes relay messages.

Can I update the firmware on the RN4020-V/RM123 after deployment?

Yes, the RN4020-V/RM123 supports firmware updates via the serial UART interface using Microchip's bootloader protocol. You can implement over-the-air firmware updates by having your host microcontroller receive new firmware images wirelessly and relay them to the module in bootloader mode. This enables remote maintenance and feature additions without physical access to deployed devices.

How do I minimize power consumption for battery-powered applications?

Optimize power consumption by configuring the module to advertise at maximum intervals (e.g., 5-10 seconds instead of continuous), implementing connection parameter negotiation to extend connection intervals during idle periods, and using the sleep command to enter ultra-low power mode between transmissions. The module consumes approximately 15 milliamps during active transmission and 2 microamps in sleep mode, allowing you to achieve multi-month battery life with appropriate duty cycling.

Is the RN4020-V/RM123 compatible with iOS and Android devices?

Yes, the RN4020-V/RM123 implements standard Bluetooth 4.1 Low Energy protocol fully compatible with iOS 5.0 and later, Android 4.3 and later, and all modern Bluetooth-enabled devices. No special drivers are required on mobile platforms as the module appears as a standard BLE peripheral device discoverable through native Bluetooth settings.

When will I receive my order?

Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.

What is your return and warranty policy?

We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.

Are bulk discounts available?

Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.

Why Buy from The Engineer Store

• Genuine Products: Sourced directly from authorized distributors with authentication
• Expert Team: Our technical team validates every product before listing
• Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
• Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
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• Technical Support: 24/7 expert guidance via email and WhatsApp
• Returns: 7-day return policy on manufacturing defects only

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