Microchip Technology RN4870 Manual

Microchip Technology RN4870 Manual

Bluetooth low energy module
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Features
• Qualified for Bluetooth SIG v5.0 Core Specification
• Certified to FCC, ISED, CE, KCC, NCC and SRRC
• On-Board Bluetooth Low Energy (BLE) Stack
• ASCII Command Interface API Over UART
• Scripting Engine for Hostless Operation
• Compact Form Factor – The RN4870/71 family
comes in four different sizes, from 6 mm x 8 mm
to 12 mm x 22 mm:
- RN4870: 12 mm x 22 mm
- RN4871: 9 mm x 11.5 mm
- RN4870U: 12 mm x 15 mm
- RN4871U: 6 mm x 8 mm
• Beacon Private Service for Beacon Services
• UART Transparent Service for Serial Data
Applications
• Remote Configuration Over-the-Air
Operational
• Operating Voltage: 1.9V to 3.6V (3.3V typical)
• Temperature Range:
- -20°C to +70°C (Normal)
- -40°C to +85°C (Industrial)
• Supports UART
• Up to Three Pulse-Width Modulation (PWM)
Outputs (only for RN4870)
RF/Analog Features
• ISM Band 2.402 to 2.480 GHz Operation
• Channels: 0-39
• RX Sensitivity: -90 dBm
• TX Power: 0 dBm
• RSSI Monitor
MAC/Baseband/Higher Layer Features
• Secure AES128 Encryption
• GAP, GATT, SM, L2CAP and Integrated Public
Profiles
• Customer Can Create up to Five Public and Four
Private Services
• Software Configurable Role as Peripheral or
Central and Client or Server
 2016-2023 Microchip Technology Inc.
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®
Bluetooth
Low Energy Module
RN4870/71
Antenna Options
• Chip Antenna Range based on Open Air
Measurements and Phone Module Connection:
- RN4870: Up to 50m
- RN4871: Up to 10m
• External Antenna Connection via RF Pad
(RN4870U/RN4871U)
Applications
• Health/Medical Devices
• Sports Activity/Fitness Meters
• Beacon Applications
• Internet of Things (IoT) Sensor Tag
• Remote Control
• Wearable Smart Devices and Accessories
• Smart Energy/Smart Home
• Industrial Control
DS50002489G-page 1

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Summary of Contents for Microchip Technology RN4870

  • Page 1 • On-Board Bluetooth Low Energy (BLE) Stack • ASCII Command Interface API Over UART • Scripting Engine for Hostless Operation • Compact Form Factor – The RN4870/71 family comes in four different sizes, from 6 mm x 8 mm to 12 mm x 22 mm: - RN4870: 12 mm x 22 mm - RN4871: 9 mm x 11.5 mm...
  • Page 2: Table Of Contents

    When contacting a sales office, please specify which device, revision of silicon and data sheet (include literature number) you are using. Customer Notification System Register on our website at www.microchip.com to receive the most current information on all of our products.  2016-2023 Microchip Technology Inc. DS50002489G-page 2 Arrow.com. Downloaded from...
  • Page 3: Device Overview

    Overview modules in the RN4870/71 family. Figure 1-1 through The RN4870/71 BLE module integrates Bluetooth 5.0 Figure 1-4 show the pinouts for the different modules. baseband controller, on-board Bluetooth stack, digital and analog I/Os and RF power amplifier into one solution.
  • Page 4 D I/O GPIO; default: Input; pulled high, AD8, Configured as the BLEDK_STATUS2_IND pin by default. P3_6 D I/O GPIO; default: Input; pulled high (only for RN4870), Configured as the UART_RTS pin by default. P2_0 D I/p System configuration input; 1: Application mode 0: Test mode/Flash update/EEPROM configuration Default: Input;...
  • Page 5 RN4870/71 TABLE 1-2: PIN DESCRIPTION (CONTINUED) RN4870U RN4870 RN4871U RN4871 Name Type Description — — P3_5 D I/O GPIO; default: Input; pulled high, A I/p LED1; provides indication whether the module is on/off. — — P0_7 D I/O GPIO; default: Input; pulled high, Configured to the LOW_BATTERY_INDICATOR pin by default.
  • Page 6 RN4870/71 FIGURE 1-2: PIN DIAGRAM – RN4870 Top View Bottom View VBAT TP-3 VCC_RF TP-3 TP-1 VCC_PA P2_2 TP-1 VDD_IO P0_2/LED VDD_IO P0_7 ULPC_O P3_5 P2_3 P3_4 BK_O P3_3 P2_7/TX_IND P3_2 TP-2 TP-2 CLDO_O P3_1 P1_1 P1_2 UART_TX P1_3 UART_RX FIGURE 1-3: PIN DIAGRAM –...
  • Page 7 RN4870/71 FIGURE 1-4: PIN DIAGRAM – RN4871 TP-3 TP-2 TP-4 TP-1 TP-5  2016-2023 Microchip Technology Inc. DS50002489G-page 7 Arrow.com. Downloaded from...
  • Page 8 Set the threshold for the RSSI link quality in EEPROM. Link Drop When the RN4870/71 is connected to a remote device, the host MCU can use the Link Drop pin to force the module to disconnect the link and enter Shutdown state.
  • Page 9 Description Pairing Key When the RN4870/71 is connected to a remote device, the host MCU can use the Pairing Key pin to force the module to disconnect the link and go back to Standby state. The pin must be pulled down for at least 160 ms.
  • Page 10 RN4870/71 NOTES:  2016-2023 Microchip Technology Inc. DS50002489G-page 10 Arrow.com. Downloaded from...
  • Page 11: Specifications

    Operating Range 1.9V to 3.6V Sensitivity -90 dBm RF TX Power 0 dBm Operating Temperature Range for RN4870-I and RN4871-I Modules -40°C to +85°C Operating Temperature Range for RN4870-V and RN4871-V Modules -20°C to +70°C Storage Temperature Range -40°C to +125°C...
  • Page 12 Shutdown Low-Power Mode — µA Note 1: The current measurements are characterized across a sample of the RN4870/71 module at room temperature (+25°C), unless otherwise noted. ® For more details on Low-Power mode, refer to the “RN4870/71 Bluetooth Low Energy Module User’s Guide”...
  • Page 13: Interface Pins

    Figure 3-2 shows the recommended connections for low-dropout regulator to the RN487X and a host MCU. running the RN4870/71 on a coin cell battery. This scheme ensures that the same voltage is used for both the module and the MCU.
  • Page 14 RN4870/71 COIN CELL POWER SCHEME RN4870/71 Reset IC Reset Note 1: Application includes ADC, PWM (RN4870) and I C bus interface. 2: BK_IN connection is needed only for RN4871U. 3: To implement low-power operation, enable the UART_RX_IND pin and connect to ground.
  • Page 15: Physical Dimensions And Attributes

    RN4870 Module also shows a minimum ground plane area to the left and right side of the module for best antenna Figure 4-1 shows the physical dimensions of the RN4870 performance. The ground plane can be extended module. Figure 4-2...
  • Page 16 RN4870/71 FIGURE 4-2: RN4870 RECOMMENDED PCB FOOTPRINT FIGURE 4-3: RECOMMENDED MOUNTING DETAILS  2016-2023 Microchip Technology Inc. DS50002489G-page 16 Arrow.com. Downloaded from...
  • Page 17 50 Ohm impedance is performance (best range, lowest noise). Pin 30 (BT_RF) recommended. is a 50 Ohm connection that can be connected to an FIGURE 4-4: RN4870U MODULE DIMENSIONS  2016-2023 Microchip Technology Inc. DS50002489G-page 17 Arrow.com. Downloaded from...
  • Page 18 RN4870/71 FIGURE 4-5: RN4870U RECOMMENDED PCB FOOTPRINT FIGURE 4-6: RN4870U RECOMMENDED PCB MOUNTING  2016-2023 Microchip Technology Inc. DS50002489G-page 18 Arrow.com. Downloaded from...
  • Page 19 TP-4 TP-4 3.68 TP-1 TP-1 TP-5 TP-5 2.38 Shield mounting 0.70 hole 0.00 Shield mounting hole Test Point Positions Pad Positions Dimensions are in millimeters Tolerances: : +/-0.06mm Pad Detail  2016-2023 Microchip Technology Inc. DS50002489G-page 19 Arrow.com. Downloaded from...
  • Page 20 RN4870/71 FIGURE 4-8: RN4871 RECOMMENDED PCB FOOTPRINT Top View 11.5 Keep Out Area Keep Out Area Dimensions are in millimeters FIGURE 4-9: RN4871 RECOMMENDED PCB MOUNTING SUGGESTION  2016-2023 Microchip Technology Inc. DS50002489G-page 20 Arrow.com. Downloaded from...
  • Page 21 If the microstrip trace is longer, a 50 Ohm impedance is recommended. FIGURE 4-10: RN4871U MODULE DIMENSIONS Side View Top View Bottom View  2016-2023 Microchip Technology Inc. DS50002489G-page 21 Arrow.com. Downloaded from...
  • Page 22 RN4870/71 FIGURE 4-11: RN4871U RECOMMENDED PCB FOOTPRINT FIGURE 4-12: RN4871U RECOMMENDED PCB MOUNTING  2016-2023 Microchip Technology Inc. DS50002489G-page 22 Arrow.com. Downloaded from...
  • Page 23 Acceptable Lowest Performance Soldering Recommendations The RN4870/71 Bluetooth module is assembled using standard lead-free reflow profile, IPC/JEDEC J-STD-020. The module can be soldered to the host PCB using standard leaded and lead-free solder reflow profiles. To avoid damaging the module, the following recommendations are given: •...
  • Page 24 RN4870/71 NOTES:  2016-2023 Microchip Technology Inc. DS50002489G-page 24 Arrow.com. Downloaded from...
  • Page 25: Application Reference Circuits

    CIRCUITS Figure 5-2 through Figure 5-5 show the reference circuits for various modules under the RN4870/71 family. External Configuration and In the circuits, the power input range is 1.9V ~ 3.6V. A battery reverse protection circuit is recommended in Programming case a battery power input is used.
  • Page 26 P1_0 P3_1 UART_RX 4.7k P1_1 P3_2 UART_TX P2_0 P2_0 MODE MODE P1_2 P3_3 P1_3 P3_4 Test Mode Test Mode P2_2 P3_5 P2_3 P3_6 High High APP Mode APP Mode MCP111-195  2016-2023 Microchip Technology Inc. DS50002489G-page 26 Arrow.com. Downloaded from...
  • Page 27 UART Interface BK_I UART_TX P1_3 VBAT P1_3 RN4871U P1_2 P1_2 P1_6 BT_RF ANT1 10 μF 6.3V X5R Antenna Matching P1_6 Configurable I/O P0_0 P1_7 P0_2 P2_0 P1_2 P2_7 P1_3 P3_6 P1_6  2016-2023 Microchip Technology Inc. DS50002489G-page 27 Arrow.com. Downloaded from...
  • Page 28 1.9V, a power supply drop protection protection circuit. circuit is recommended. Essentially, this circuit consists FIGURE 5-6: POWER DROP PROTECTION CIRCUIT VBAT RN4870/71 Reset IC RST_N  2016-2023 Microchip Technology Inc. DS50002489G-page 28 Arrow.com. Downloaded from...
  • Page 29: Ascii Command Api

    ASCII COMMAND API • GATT Services - Create/delete public services/characteristics The RN4870/71 command Application Programming - Read/write characteristic values Interfaces (APIs) are documented in the “RN4870/71 - Set notification for characteristics ® Bluetooth Low Energy Module User’s Guide” • GAP Role (DS50002466).
  • Page 30 RN4870/71 NOTES:  2016-2023 Microchip Technology Inc. DS50002489G-page 30 Arrow.com. Downloaded from...
  • Page 31: Supported Services

    In addition to the above predefined private services, the Module User’s Guide” (DS50002466). RN4870 provides the ability to create private services. RN4870 allows custom-defined services for up to five If the services are supported on both end points of a public and four private services.
  • Page 32 RN4870/71 NOTES:  2016-202G Microchip Technology Inc. DS50002489G-page 32 Arrow.com. Downloaded from...
  • Page 33: Antenna Characteristics

    RN4870/71 ANTENNA CHARACTERISTICS The RN4870 and RN4871 modules contain an integral ceramic chip antenna. Figure 8-1 Figure 8-2 show the antenna performance on the modules. FIGURE 8-1: RN4870 ANTENNA PERFORMANCE Parameter Values Frequency 2450 MHz Max Gain 1.63 dBi Efficiency 71.55%...
  • Page 34 FIGURE 8-2: RN4871 ANTENNA PERFORMANCE Parameter Values Frequency 2442 MHz Max Gain 0.1 dBi Efficiency 42.7% Antenna Description Manufacturer Part Number Manufacturer ANT AANT3216LL00R2400A ANT3216LL00R2400A Yageo Corporation PIFA 2.4GHz L3 2W1.6  2016-2023 Microchip Technology Inc. DS50002489G-page 34 Arrow.com. Downloaded from...
  • Page 35: Timing Characteristics

    Figure 9-2 shows the timing diagram for User’s Guide” (DS50002466). the module when it is powered on. In Application mode, FIGURE 9-1: TIMING DIAGRAM OF RN4870/71 UART READY AFTER RESET (IN TEST AND APPLICATION MODE) Reset UART Ready for MCU...
  • Page 36 RN4870/71 FIGURE 9-2: TIMING DIAGRAM OF RN4870/71 UART WHEN POWERED ON (IN TEST AND APPLICATION MODE) VBAT UART Ready for MCU P2_0=0 Test Mode Process 25mS UART Ready for MCU Status pin/UART Application P2_0=1 Report Command Mode Process 46mS 68mS The table below shows the error rate for various UART baud rates for the RN4870/71 module.
  • Page 37: Ordering Information

    1.30. Ensure to check product webpage for the latest part number and firmware version. Note: Go to http://www.microchip.com for current pricing and a list of distributors carrying Microchip products.  2016-2023 Microchip Technology Inc. DS50002489G-page 37 Arrow.com. Downloaded from...
  • Page 38 RN4870/71 NOTES:  2016-2023 Microchip Technology Inc. DS50002489G-page 38 Arrow.com. Downloaded from...
  • Page 39: Regulatory Approval

    LABELING AND USER INFORMATION REQUIREMENTS The RN4870 module has received the regulatory The RN4870 module has been labeled with its own approval for the following countries: FCC ID number, and if the FCC ID is not visible when • United States/FCC ID: A8TBM70ABCDEFGH the module is installed inside another device, then the •...
  • Page 40 • Increase the separation between the equipment 11.2 Canada and receiver. • Connect the equipment into an outlet on a circuit The RN4870/71 module has been certified for use in different from that to which the receiver is Canada under Innovation, Science and Economic connected. Development...
  • Page 41 This radio transmitter [IC: 12246A-BM70BLES1F2 The RN4870/71 module has been tested to RED 2014/ and IC: 12246A-BM71S2] has been approved by 53/EU Essential Requirements mentioned in the Innovation, Science and Economic Development following European Compliance table.
  • Page 42 The integrator should contact their conformance laboratory to determine if this testing is required. 11.3.3 APPROVED ANTENNAS • There is a voluntary Electromagnetic Compatibility For RN4870, the approval is received using the antenna (EMC) test for the host product administered by listed in Figure 8-1.
  • Page 43 INFORMATION REQUIREMENTS 11.5 Korea The RN4870 module is labeled with its own NCC ID number, and if the NCC ID is not visible when the The RN4870/71 module has received certification of module is installed inside another device, then the out- conformity in accordance with the Radio Waves Act.
  • Page 44 LABELING AND USER RN4870/71 module must follow the UKCA marking INFORMATION REQUIREMENTS requirements. The RN4870 module is labeled with its own CMIT ID as follows: The RN4871 module is labeled with its own CMIT ID as follows:  2016-2023 Microchip Technology Inc.
  • Page 45 UKCA DECLARATION OF CONFORMITY Hereby, Microchip Technology Inc. declares that the radio equipment type RN4870/71 is in compliance with the Radio Equipment Regulations 2017. The full text of the UKCA declaration of conformity for this product is available (under Documents > Certifica- tions) at: https://www.microchip.com/en-us/product/RN4870...
  • Page 46: Appendix A: Revision History

    Added UKCA regulatory formity Assessed)” approval information Revision B (October 2017) Revision G (March 2023) • Added the new parts, RN4870-I/RMXXX and RN4871-I/RMXXX, released with increased • Updated (included Voltage Monitor/Reset IC on operating temperature range. the reference circuit) Figure...
  • Page 47 RN4870/71 NOTES:  2016-2023 Microchip Technology Inc. DS50002489G-page 47 Arrow.com. Downloaded from...
  • Page 48: The Microchip Website

    To register, access the Microchip website at www.microchip.com. Under “Support”, click on “Customer Change Notification” and follow the registration instructions.  2016-2023 Microchip Technology Inc. DS50002489G-page 48 Arrow.com. Downloaded from...
  • Page 49 RN4870/71 NOTES:  2016-2023 Microchip Technology Inc. DS50002489G-page 49 Arrow.com. Downloaded from...
  • Page 50: Product Identification System

    -40C to +85C (Industrial) is not printed on the device package. Check with your Microchip Sales Office for package availability with the Tape and Reel option. Package: RM = Radio Module  2016-2023 Microchip Technology Inc. DS50002489G-page 50 Arrow.com. Downloaded from...
  • Page 51 RN4870/71 NOTES:  2016-2023 Microchip Technology Inc. DS50002489G-page 51 Arrow.com. Downloaded from...
  • Page 52 RN4870/71  2016-2023 Microchip Technology Inc. DS50002489G-page 52 Arrow.com. Downloaded from...
  • Page 53 Microchip intellectual property rights unless otherwise stated. GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies.
  • Page 54 Sweden - Stockholm San Jose, CA Tel: 46-8-5090-4654 Tel: 408-735-9110 UK - Wokingham Tel: 408-436-4270 Tel: 44-118-921-5800 Canada - Toronto Fax: 44-118-921-5820 Tel: 905-695-1980 Fax: 905-695-2078  2016-2023 Microchip Technology Inc. and its subsidiaries DS50002489G-page 54 09/14/21 Arrow.com. Downloaded from...

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