Microchip Technology RN4020 User Mnaual Technical Spec.
Bluetooth® Low Energy Module
DRAFT
Features
• Fully qualified Bluetooth® version 4.1 module
• Onboard Bluetooth Low Energy 4.1 stack
• ASCII command interface API over UART
• Multiple IOs for control and status
• Secure AES128 encryption
• GAP, GATT, SM, L2CAP and integrated public
profiles
• Create custom services using command API
• Microchip Low Energy Data Protocol (MLDP) for
streaming data applications
• Software configurable role as peripheral or central, client or server
• Compact form factor 11.5 x 19.5 mm
• Low-power consumption
• UART interface, GPIO, ADC
• 64 KB internal serial flash
• Castellated SMT pads for easy and reliable PCB
mounting
• Environmentally friendly, RoHS compliant
• Certifications: FCC, IC, CE, QDID
• Device Firmware Upgrade (DFU)
Description
Microchip’s RN4020 Bluetooth Low Energy Module
provides a highly integrated solution for delivering low
power Bluetooth 4.1 solu tions. The advanced command interface offers rapid time to market.
The RN-4020 module complies with Bluetooth specification version 4.1. It integrates RF, a baseband controller, command API processor, making it a compl ete
Bluetooth Low Energy Solution.
The RN4020 can be use d with either low cost microcontroller for intelligent Bluetooth Low Energy applications. For simpl e sensor ap plications, the RN4020
internal scripting capabilities enable basic functions to
be implemented without the need for external host
MCU or software development tools.
RN4020
Applications
• Health/Medical Devices
- Glucose Meters
- Heart rate
-Scale
• Sports Activity and Fitness
- Pedometer
- Cycling computer
- Heart rate
• Retail
-POS
- Asset tagging and tracking
- Proximity Advertising
• Beacon applications
• Internet of Things Sensor tag
• Remote Control
- Keyboard Mice
- AV consoles, game controllers
• Wearable smart devices and accessories
• Industrial Control
- Private (custom) services
- Low bandwidth cable replacement
• Smart Energy/Smart Home
2014 Microchip Technology Inc. DSXXXXXXXXA-page 1
RN4020
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Table of Contents
1.0 Device Overview........................................................................................................................................................................... 3
2.0 General Specifications.................................................................................................................................................................. 5
3.0 Microcontroller to RN4020 Interface ............................................................................................................................................. 6
4.0 Physical Dimensions..................................................................................................................................................................... 7
5.0 Typical Application Schematic ...................................................................................................................................................... 8
6.0 ASCII Command API .................................................................................................................................................................... 9
7.0 Supported Services .................................................................................................................................................................... 10
8.0 Regulatory Approval ................................................................................................................................................................... 13
9.0 Ordering Information................................................................................................................................................................... 19
Appendix A: Revision History ............................................................................................................................................................... 21
The Microchip Web Site ....................................................................................................................................................................... 23
Customer Change Notification Service................................................................................................................................................. 23
Customer Support ................................................................................................................................................................................ 23
Product Identification System............................................................................................................................................................... 25
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DSXXXXXXXXA-page 2 2014 Microchip Technology Inc.
1.0 DEVICE OVERVIEW
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FIGURE 1-1: RN4020 TOP VIEW
Figure 1-2 shows the module’s pinout and
Table 1-1 describes the pins.
RN4020
FIGURE 1-2: RN4020 PIN DIAGRAM
2014 Microchip Technology Inc. DSXXXXXXXXA-page 3
RN4020
DRAFT
TABLE 1-1: PIN DESCRIPTION
Pin Symbol Description Function
1 GND Ground Ground
2 AIO2 Bi-directional with programmable analog IO 1.65V input, 1.35V out, and 30mA max out
3 AIO1 Bi-directional with programmable analog IO 1.65V input, 1.35V out, and 30mA max out
4 AIO0 Bi-directional with programmable analog IO 1.65V input, 1.35V out, and 30mA max out
5 UART TX UART TX Output from RN4020
6 UART RX UART RX Input to RN4020
7 WAKE-SW Deep Sleep Wake; active high to wake
module from deep sleep
8 CMD/DATA Command or Data – In Command , UART
traffic is sent to command interpreter, other
maybe routed to Microchip Serial Data service.
9 GND Ground Ground
10 SPI-CLK
GPIO[1]
11 SPI-CS#
GPIO[2]
12 SPI-MOSI
GPIO[3]
13 SPI-MISO
GPIO[4]
14 CTS
GPIO[6]
15 WAKE-HW Hardware wake from Hibernate or Dormant
16 GND Ground Ground
17 SPI/PIO
18 RTS
GPIO[5]
19 ADVCONN
GPIO[7]
20 RSVD Do not connect. Factory diagnostics NC
SPI-CLK for diagnostics and factory calibration if pin 17 asserted. Default state is output: Active Low indicates module is
connected to remote device. High level indicates disconnected state. Configurable as
GPIO[1] via software command.
SPI-CS# for diagnostics and factory calibration if pin 17 asserted. Default state is output. Active High indicates module has a
pending event. Low level indicates no
events. Event only triggered in DATA , pin 8
is high. Configurable as GPIO[2] via software command.
SPI-MOSI for diagnostics and factory calibration if pin 17 asserted. Default state is
output. Active High indicates module is
awake and active. Low level indicates a
sleep state. Configurable as GPIO[3] via
software command.
SPI-MISO for diagnostics and factory calibration if pin 17 asserted. Configurable as
GPIO[4] via software command.
Reserved for CTS if hardware flow control is
on UART. Configurable as GPIO[6] if hardware flow control is disabled.
state
SPI/PIO for pins 10-13, Active High Input with internal pull down; selects SPI on 10-
Reserved for RTS if hardware flow control
on UART. Configurable as GPIO[5] if hardware flow control disable
Active Low; In Peripheral the input put
module in advertising state (discoverable
and open for connection). In Central , initiates connect to stored address.
Input; weak pull down
Input; Active High to enter Command
• SPI-CLK
• Connected Status (Green LED)
• GPIO[1]
• SPI-CS#
• Event Pending (Red LED)
• GPIO[2]
• SPI-CLK
• Wake Status (Blue LED)
• GPIO[3]
• SPI-CLK
• GPIO[4]
• CTS (input)
• GPIO[6]
Active High; internal pull down
13
• RTS (output)
• GPIO[5]
Initiate Advertising state or connect to stored
address
DSXXXXXXXXA-page 4 2014 Microchip Technology Inc.
TABLE 1-1: PIN DESCRIPTION (CONTINUED)
DRAFT
Pin Symbol Description Function
21 RSVD Do not connect. Factory diagnostics NC
22 RSVD Do not connect. Factory diagnostics NC
23 VDD Supply voltage: 2.0 to 4.2V Supply Voltage, 2.0 to 4.2
24 GND Ground Ground
RN4020
2.0 GENERAL SPECIFICATIONS
Table 2-1 provides the general specifications for the
module. Ta bl e 2 -2 , Ta bl e 2 -3 , and Table 2-4 provide
the module’s weight, dimensions, electrical characteristics, and current consumption.
TABLE 2-1: GENERAL SPECIFICATIONS
Specification Description
Standard Bluetooth 4.1
Frequency Band 2.4 ~ 2.48 GHz
Modulation Method GMSK
Maximum Data Rate 1 Mbps
Antenna PCB and chip (0dBi)
Interface UART, PIO, AIO, SPI
Operation Range 100 meters
Sensitivity -93 dBm at 0.1% BER
RF TX Power +8.5 dBm (max)
Temperature (operating) -30°C to +85°C
Temperature (storage) -40°C to +85°C
ESD JESD22-A224 class 0
product
Humidity 10% ~ 90% non-con-
densing
TABLE 2-4: CURRENT CONSUMPTION
Mode Typical Current at 3V
Dormant <700nA
Hibernate <2.0uA
Deep Sleep <5.0uA
Idle <1.5mA
Tx/Rx active 16 mA at 0 dBM
TABLE 2-2: WEIGHT AND DIMENSIONS
Specification Description
Dimensions RN4020: 19.5 x 11.5 x 2.5 mm
Weight 1.2 g
TABLE 2-3: ELECTRICAL
CHARACTERISTICS
Specification Description
Supply Voltage 3Vport: 2.0 - 4.2 V DC
Working current Depends on profiles, 12 mA
typical
Standby current
(disconnected)
2014 Microchip Technology Inc. DSXXXXXXXXA-page 5
<0.5 mA)
RN4020
DRAFT
3.0 MICROCONTROLLER TO RN4020 INTERFACE
FIGURE 3-1: INTERFACE DESCRIPTION
Figure 3-1 illustrates the interface between PIC micro-
controller and RN4020 module. The minimum interface
consists of UART and WAKE HW line. This enables the
microcontroller to communi cate with RN 4020 module
using ASCII comman d API. T he command API is
described in Sec XX.
3.1 CTS/RTS Hardware Flow Control
For customer applications using the Microch ip Low
Energy Data Protocol (MLEDP), Pin 8 (CMD/DATA) is
required. CTS/RTS hardware control is also highly recommended for this service to avoid buffer overruns.
3.2 Microchip Low Energy Data Protocol (MLDP)
The Microchip Low En ergy Data Protocol is a private
BTLE service that provides a 20kbps serial data transport over Bluetooth Low Energy on the RN4020. Pin 8
(CMD/DATA) is required. CTS/RTS hardware control is
also highly recommended for this service to avoid data
loss.
Refer to “ RN4020 Command Reference”, for more
information on how to configure the MLDP service
mandatory for DFU over UART.
DSXXXXXXXXA-page 6 2014 Microchip Technology Inc.
RN4020
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4.0 PHYSICAL DIMENSIONS
Figure 4-1 shows the physical dimensions for RN4020 module. Figure 4-2 shows the recommended PCB layout.
FIGURE 4-1: PHYSICAL DIMENSIONS FOR RN4020
FIGURE 4-2: RECOMMENDED PCB FOOTPRINT
2014 Microchip Technology Inc. DSXXXXXXXXA-page 7
RN4020
DRAFT
5.0 TYPICAL APPLICATION SCHEMATIC
Figure 5-1 shows schematic for the RN4 020 PICtail™/PICtail Plus Daughter Board development tool, PN-
XXXXXXXXXX.
FIGURE 5-1: RN4020 TYPICAL APPLICATION SCHEMATIC
DSXXXXXXXXA-page 8 2014 Microchip Technology Inc.
6.0 ASCII COMMAND API
DRAFT
The RN4020 command API is documented in RN4020
Command Reference: doc-xxx-xxxxxx:
Commands are categorized into the following functions:
• Built-in public services
- Enable/Disable service as Server or Client
- Red value
- Set value
•Max Tx Power
- Set Power in DB
•Role
- Peripheral or Central
• Advertising
- Start/Stop
• Bonding
- Bond/Unbond to Master
• Private Service
- Set Private Service UUID
- Set Characteristic UUID for Private Service
• Microchip Low Energy Data Protocol
- Enable/Disable
- Peripheral side configuration
- Central side configuration
• Device Information Profile settings
• Connection
-Status
- Disconnect
- Kill active connection
- Establish connection (Central role only)
- Start/Stop inquiry scan for other devices
(Central role only)
•IO
- Configure GPIO mask
- Set/Get GPIO states
- Ready raw ADC values
• System
- Reboot
- Enter deep sleep
- Factory default
- Test functions for type approval
- Display configuration
RN4020
2014 Microchip Technology Inc. DSXXXXXXXXA-page 9
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