RM2642 Bluetooth Low Energy Module
Product Information: RM2642 Bluetooth Low Energy Module
Specifications
| Normal Operating Conditions | |
|---|---|
| Operating supply voltage | 1.7 – 5.5 VDC |
| Operating temperature range | -60°C to |
| Peak supply current | 7 mA – 19.3 mA |
Electrical Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| VIH | 0.8*VDDS V | |||
| VIL | 0.2*VDDS V | |||
| SPI freq to main MCU | MHz |
Radio Specifications
| Operating frequency | 2402 – 2480 MHz |
|---|---|
| Number of channels | 40 |
| Channel separation | 2 MHz |
| Occupied channel bandwidth | 1.1 MHz |
Product Usage Instructions
Integration Guide Purpose:
This guide is for integrating the RM2642 BLE module into
approved Rosemount products for a complete Bluetooth solution.
General Information – Product Description:
The BLE module complies with Bluetooth Low Energy Core
Specification 5.2, operating in the 2.4GHz ISM frequency band with
a minimum line-of-sight range of 50ft.
Regulatory and Standards Compliance:
The module meets FCC, ISED, and EU compliance standards. Refer
to the user manual for specific testing and documentation
requirements.
RF Exposure Considerations:
Please ensure compliance with RF exposure guidelines when
integrating the BLE module into your product.
Frequently Asked Questions (FAQ)
Q: What is the operating supply voltage range for the RM2642
BLE module?
A: The operating supply voltage range is 1.7V to 5.5VDC.
Q: What is the maximum distance the BLE module is expected to
operate at?
A: The BLE module is expected to operate at a minimum distance
of 50ft line of sight.
Q: What are the FCC compliance requirements for the RM2642 BLE
module?
A: The module undergoes FCC compliance testing and meets
labeling and documentation requirements as outlined in the user
manual.
RM2642 Integration Guide
Rosemount RM2642 Bluetooth Low Energy Module Integration
Guidance
Revision A5 23 July 2025
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RM2642 Integration Guide
Contents
1 Purpose ……………………………………………………………………………………………………………….3 2 General Information ……………………………………………………………………………………………….3
2.1 Product Description………………………………………………………………………………………….3 3 Specifications………………………………………………………………………………………………………..3
3.1 Normal Operating Conditions …………………………………………………………………………….3 3.2 Electrical Specifications ……………………………………………………………………………………3 3.3 Radio Specifications ………………………………………………………………………………………..3 4 Antenna Specifications……………………………………………………………………………………………4 5 Installation Guidelines …………………………………………………………………………………………….4 5.1 Spectrum Approval Test Modes …………………………………………………………………………4
5.1.1 Bluetooth Tests…………………………………………………………………………………………4 6 Regulatory and Standards Compliance……………………………………………………………………..5
6.1 FCC Compliance Testing ………………………………………………………………………………….5 6.1.1 FCC Labeling Requirements……………………………………………………………………….5 6.1.2 FCC Documentation Requirements ……………………………………………………………..6
6.2 ISED Compliance Testing …………………………………………………………………………………6 6.2.1 ISED Labeling Requirements………………………………………………………………………6 6.2.2 ISED Documentation Requirements …………………………………………………………….6
6.3 EU Compliance ……………………………………………………………………………………………….7 7 RF Exposure Considerations …………………………………………………………………………………..7
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RM2642 Integration Guide
1 Purpose
This document serves as a guide for integrating the RM2642 BLE module into approved Rosemount products for a complete Bluetooth solution.
2 General Information
2.1 Product Description
The BLE module has been designed to be fully compliant with Bluetooth Low Energy Core Specification 5.2. It operates in the 2.4GHz ISM frequency band and is expected to operate to a minimum distance of 50ft line of sight.
3 Specifications
3.1 Normal Operating Conditions
Min Typ Max Units
Comments
Operating supply voltage
1.7 3.3 5.5 VDC
Operating temperature range -60
85 °C
Peak supply current
7
mA 25C, 3VDC, Advertising mode
10.7
mA 25C, 3VDC, 2M constant TX
19.3
mA 85C, 1.85VDC, 2M constant TX
3.2 Electrical Specifications
Parameter
Test Conditions
VIH
TA = 25C, VDDS = 3.8V
VIL
TA = 25C, VDDS = 3.8V
SPI freq to main MCU
SPI freq to external flash
Min Typ
Max Units
0.8*VDDS
V
0.2*VDDS V
3.75
MHz
12
MHz
3.3 Radio Specifications
Operating frequency Number of channels Channel separation Occupied channel bandwidth Modulation Raw data rate Output power setting
Min Typ Max Units
Comments
2402
2480 MHz Channel center 2442MHz
40
2 1.1 GFSK 1 5
MHz MHz 99% at 1Mbps
IEEE 802.15.1 2 Mbps
dBm Output power rating: 2.2 dBm
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4 Antenna Specifications
RM2642 Integration Guide
The RM2642 module uses an on-board PCB trace antenna with a measured antenna gain as shown in EMPM0206 OTA report of -0.60 dBi. The antenna is permanently connected to the radio on the module. No other antennas are approved for use with this module.
5 Installation Guidelines
The RM2642 radio module is only available for use in Emerson products. Host integrators must consult with the manufacturer for specific pinout assignments for data and power. Host integrators must perform required testing to ensure compliance with host product regulations. This section describes the test modes needed for spectrum approvals. To access these test modes, special host test firmware must be loaded.
5.1 Spectrum Approval Test Modes
Spectrum approval test modes are accessed via serial commands using TI’s BTool software. Btool version 1.42.19 must be used. UART connections are available on pins 5 and 6 of the module. USB to UART serial converters from FTDI are recommended (TTL-232RG). Be sure to choose the correct voltage cable that matches with your supply voltage to the BLE module. These test modes are not accessible by the general public.
5.1.1 Bluetooth Tests
Radio testing for Bluetooth is performed as both radiated and/or conducted testing. The conducted tests require a Murata RF probe be connected to the BLE module (P/N MXHQ87WA3000) and routed to the labs test equipment. Transmit tests require the following BTool commands and runs at 100% duty cycle:
· HCIExt_SetTxPowerCmd Set transmit power to +5dBm · HCIExt_EnhancedModemTestTxCm Set PHY mode (1M or 2M) and RF channel to be
tested. · HCIExt_EndModemTestCmd Select this to change RF channels, PHY modes, or when
the test is complete. Receive tests require the following BTool command:
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RM2642 Integration Guide
· HCIExtModemTestRxCmd Place the module into receive mode for Receiver Spurious Emissions. Select channel to be tested (usually channels 0 and 39).
6 Regulatory and Standards Compliance
The RM2642 allows modular host product integration in the United States, Canada, and European Union. The following guidance must be reviewed to ensure final compliance to regulatory standards.
Host integrators must perform their own system level spectrum approval testing to ensure compliance with world area regulations.
6.1 FCC Compliance Testing
The RM2642 radio module has demonstrated compliance to FCC 15.247.
In order to fulfill FCC certification requirements, products incorporating the RM2642 must comply with the following:
1. An external label must be provided on the outside of the final product enclosure specifying the FCC identifier as described in below. a. Alternatively, if the device is always shipping with a graphical display, the business unit may incorporate an electronic label that incorporates the FCC identifier (according to e-labeling guidance per FCC KDB 784748 D02).
2. The system level device integrating the RM2642 must demonstrate compliance to FCC 15.247 requirements. a. The device integrating the RM2642 may not cause harmful interference, and must accept any interference received, including interference that may cause undesired operation.
3. An unintentional radiator scan must be performed on the device integrating the RM2642, per FCC rules and regulations, CFR Title 47, Part 15, Subpart B. See FCC rules for specifics on requirements for declaration of conformity.
4. A class II permissive change is required to add additional hosts. 5. See section 8 for unshielded limited module test plan per Appendix C of KDB 996369
D01 Reference KDB 996369 D04 Module Integration Guide v02 for detailed integration and testing guidance.
6.1.1 FCC Labeling Requirements
The outside of the final product enclosure must have a label with the following (or similar) text specifying the FCC identifier. The FCC ID must be in Latin letters and Arabic numbers, 4pt or larger, and visible without magnification.
Contains transmitter module FCC ID: LW2RM2642 Or Contains FCC ID: LW2-RM2642
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RM2642 Integration Guide
6.1.2 FCC Documentation Requirements
User documentation must contain the following statements:
· 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.
· This device must be installed to ensure a minimum antenna separation distance of 20 cm from all persons.
· Changes or modification to the equipment not expressly approved by Emerson could void the user’s authority to operate the equipment.
6.2 ISED Compliance Testing
The RM2642 radio module has demonstrated compliance to ISED RSS-247. The system level device integrating the RM2642 must demonstrate compliance to RSS-247 requirements and must meet all applicable requirements in RSS-Gen, including the radio frequency exposure compliance requirements in RSS-102.
6.2.1 ISED Labeling Requirements
The host product manufacturer must ensure that IC labeling requirements are met. The outside of the final product enclosure must have a label with the following (or similar) text specifying the IC identifier. Alternatively, if the device is always shipping with a graphical display, the business unit may incorporate an electronic label that incorporates the IC identifier (according to elabeling guidance in RSS-GEN, Annex B).
The IC ID and certification code must be in Latin letters and Arabic numbers, 4pt or larger, and visible without magnification.
Contains IC: 2731A-RM2642
6.2.2 ISED Documentation Requirements
This device contains licence-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canada’s licence exempt RSS(s). Operation is subject to the following two conditions:
(1) This device may not cause interference.
(2) This device must accept any interference, including interference that may cause undesired operation of the device.
L’émetteur/récepteur exempt de licence contenu dans le present appareil est conforme aux CNR d’Innovation, Sciences et Développement économique Canada applicables aux appareils radio exempts de licence. L’exploitation est autorisée aux deux conditions suivantes :
(1) L’appareil ne doit pas produire de brouillage;
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RM2642 Integration Guide
(2) L’appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d’en compromettre le fonctionnement.
6.3 EU Compliance
The RM2642 radio module has demonstrated compliance as a module to the following standards: EN 300 328 V2.2.2 EN 301 489-1 V2.2.2 EN 301 489-17 V3.2.4 EN 62311:2020 Host products are required to demonstrate compliance to the EU Radio Equipment Directive (RED) 2014/53/EU and follow all documentation and labeling requirements.
7 RF Exposure Considerations
The RM2642 module has demonstrated compliance to RF exposure limitations for FCC, ISED, and EU. The RM2642 must be installed to ensure a minimum antenna separation distance of 20 cm from all persons. The RM2642 must be installed in accordance with manufacturers specifications. To be used in any other way than granted, requires additional evaluation and testing.
8 Detailed Limited Modular Approval Test Plan
The RM2642 is an unshielded, limited module and requires testing and a class II permisive change to integrate into a new host. For any EIRP or output power changes, see 996369 D01 Module Certification Guide and use engineering judgment to determine a path forward. To integrate the RM2642 into a new host, the following must all be complete.
– Confirm and document the continued compliance for the fundamentals for each band under each specific rule part granted for the module.
– The test shall demonstrate each band’s worst-case modulation mode(s). Worst case can be chosen by completing pre-scans as outlined in the table below. If a worst-case is not chosen, full compliance testing will be required.
– Test band edge compliance for the widest and narrowest bandwidths per modulation type. The widest bandwidth, highest aggregate power, and highest power spectral density should be tested.
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RM2642 Integration Guide
-Include radiated spurious emissions with the antenna connected. Testing shall be performed for each supported modulation testing 15.31(m). In all cases, a test of each modulation is required for channels over the frequency range defined in 15.33(a) for unlicensed transmitters and 2.1057(a) for licensed transmitters.
-Confirm and demonstrate with the radiated test that no additional parasitic, non-compliant emissions exist due to ingress (parasitic oscillations, radiation of stray signals within a host, etc.) are present.
Below is the required test and method of 15.247 to test to when integrating the RM2642 into a new host.
Table 1: Test plan for module integration Table 2: Power line Conducted Emissions limit
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Documents / Resources
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Rosemount RM2642 Bluetooth Low Energy Module [pdf] User Guide RM2642, RM2642 Bluetooth Low Energy Module, Bluetooth Low Energy Module, Low Energy Module, Module |