Resmed Sensor Technologies BM11 Sensor Module User Manual Manual
Resmed Sensor Technologies Ltd Sensor Module Manual
Manual
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| Document ID | 1571818 |
| Application ID | DQt9JDfVvgO19p4ykN8F4g== |
| Document Description | Manual |
| Short Term Confidential | No |
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| Document Type | User Manual |
| Display Format | Adobe Acrobat PDF - pdf |
| Filesize | 35.42kB (442703 bits) |
| Date Submitted | 2011-11-01 00:00:00 |
| Date Available | 2011-11-02 00:00:00 |
| Creation Date | 2011-10-17 13:54:18 |
| Producing Software | Adobe PDF Library 9.0 |
| Document Lastmod | 2011-10-17 13:54:24 |
| Document Title | Manual |
| Document Creator | Acrobat PDFMaker 9.1 for Word |
| Document Author: | Paul |
BM11 Movement & Breathing Sensor OEM Installation Instructions BiancaMed Ltd Dublin Ireland Phone: +353 1 716 3755 www.biancamed.com BM11_DOC2 v01-Oct11 Table of Contents About the BM11 Movement & Breathing Sensor ..................................................................................2 BM11 Technology Overview ............................................................................................................2 Module Specifications.........................................................................................................................3 Physical Specifications.....................................................................................................................3 Radio Frequency Sensor Specifications.............................................................................................4 Electrical Specifications ...................................................................................................................6 Analogue Sensor Data .....................................................................................................................7 Environmental Specifications...........................................................................................................9 Parts & Materials................................................................................................................................9 Testing Standards/Conformance to Collateral/ International Standards ...............................................10 Module Mounting & Product Integration Considerations ....................................................................11 Interference from Internal Wireless Devices...................................................................................11 Information for OEM User Leaflet & Labeling .....................................................................................12 Mandatory .......................................................................................................................................12 Device Label: ................................................................................................................................12 User Leaflet: .................................................................................................................................12 Information......................................................................................................................................13 Device Information .......................................................................................................................13 Device Placement .........................................................................................................................13 Device Specifications.....................................................................................................................14 Page 1 About the BM11 Movement & Breathing Sensor The BM11 sensor is a complete non-contact breathing detector on a small circuit board. The sensor uses Radio Frequency, centred on 10.525 GHz, which is a license-free operating band. The BM11 is designed to be easily incorporated into Original Equipment Manufacturers’ own products, where the breathing rate and rhythm of a subject is required. The key features are: • • • • • Small antenna horn: easy to incorporate the circuit board into another product. Slender and enclosed circuitry: gives maximum flexibility in enclosure design. Very low emitted power, less than home broadband router or mobile phone BlueTooth. Non-contact: ease of use and comfort for the customer. Very short range: the sensor is selective. The sensor has 2 channels, I and Q, providing movement and breathing data. The sensor data is provided as an analogue signal. BM11 Technology Overview The sensor module is designed to emit very low power RF waves that are reflected by a human subject within the field of the sensor. The reflected waves received by the sensor contain information about the motion of the human subject based on the Doppler Effect. The system detects movement of the subject due to breathing and also due to change in position. The sensor module translates the movement of the human subject into electrical signals. To maximise the information obtained from the sensor, the signals are converted into two voltage signals. These signals are referred to as the ‘I’ and ‘Q’ channels. The sensor module outputs these two analogue voltage signals and they are presented to the OEM host device for digitising. There is a companion software library available, that extracts breathing, movement and sleeping information from the sensor data. This software library can reside within the OEM application and provide the information under the application’s control. See BiancaMed product specification BM012_DES01 for details. Page 2 Module Specifications The BiancaMed BM11 Sensor is a 10.525GHz motion detector. It comprises a motherboard PCBA, an integral RF PCBA, die cast RF metalwork and a custom plastic anti-tamper enclosure. Physical Specifications Parameter Circuit board dimensions Complete assembly (including anti-tamper enclosure) dimensions Value 44.5mm by 77.5mm by 6 mm 63.75mm (x) by 79.3mm (y) by 10mm (z) main body of enclosure, Complete assembly weight <100 gm Remarks See diagram below 13.8 mm (z) at enclosure hump 22.5mm (z) max by horn, see Figure 2 below Figure 1: PCB Layout, showing the Antenna Horn on the top side and the connector at the bottom Page 3 z Figure 2: 3-D Model of PCB Enclosed in Anti-Tamper Enclosure NB: A Solidworks 3D model is available from BiancaMed upon request. Radio Frequency Sensor Specifications Parameter Centre frequency fc Peak RF power (conducted at antenna) Value 10.525 GHz 2 dBm nominal power Spurious Conducted Power OBW (99%) <-26dBm OBW will lie within fc±15 MHz and OBW will be ≤18 MHz RF t/x Pulse PRF RF Duty Cycle Antenna Type 1000nS 500 KHz 50% Antenna Gain Antenna Beam width Azimuth* Broadside pyramidal HORN reflector antenna with planar monopole feed. 6 dBi @ fo 60-70 degrees ( 3dB) Page 4 Remarks +/- 10 MHz (Rated power +/- 50%) fo = fundamental frequency see sample beam pattern below at Figure 3a Parameter Antenna Beam width Elevation* Value 50-60 degree (3dB) Remarks see sample beam pattern below at Figure 3b Typical breathing detection range Can detect bio-motion signals inside 1.5M. Cannot be measured outside 1.8M. Comply with following Regulatory Approval Specifications: ARIB-std T73v1.1 Electrical safety: IEC60065:2005 EMC & ESD: IEC60601-1, 1-2 (2nd) FCC part 15.245 Target aspect is not important, ie the target can be sitting, lying down, face up face down, on side etc. • *The antenna characterization applies to the unhoused sensor module – antenna characteristics may vary when inserted into an OEM housing – it is the responsibility of the system integrator to ensure that the final antenna characteristics are fit for purpose. 10.525 GHz combined polarisation for azimuth 350355 345 10 340 335 330 325 320 315 310 305 300 -10 295 290 285 -20 280 275 270 -30 265 260 255 250 245 240 235 230 225 220 215 210 205 200 195 190185 180 5 10 15 2025 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 145 150 155 160 165 170 175 Figure 3a: Azimuth Beam Pattern (arrow depicts line of sight of the sensor) Page 5 10.525 GHz combined polarisation for elevation 180 175 170 10 165 160 155 150 145 140 135 130 125 -10 120 115 110 -20 105 100 95 -30 90 85 80 75 70 65 60 55 50 45 40 3530 2520 1510 -175 -170 -165 -160 -155 -150 -145 -140 -135 -130 -125 -120 -115 -110 -105 -100 -95 -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -15-20 0 -5 -10 Figure 3b: Elevation Beam Pattern (arrow depicts the line of sight of the antenna, 5 deg below horizontal in standard mounting) Electrical Specifications Parameter Input voltage Value +4.5 to 12 VDC Maximum current draw nominal current draw Maximum voltage ripple allowed 25 mA 22mA 40 µVrms /(√ (Hz)) over 10 Hz to 100 KHz bandwidth Maximum supply voltage allowed Minimum tolerable supply voltage Reference Voltage 12 Vdc Reference Voltage line output 1 kOhm Remarks Prefer 5 to 6 Vdc to reduce power dissipation on the sensor board. See notes 1 & 2 below. Avoid any noise peak around 5 kHz (close to IF in the sensor) +4.5 Vdc 1.25 Vdc Provided back to motherboard from the sensor as analogue zero for ADC conversion Page 6 Parameter impedance Sensor start time before data is available Value Remarks n/a Connector Hirose 10-Way 2mm Pitch Header Connector Largely dependent upon software analysis algorithms. Sensor itself requires <5s before supplying a stable data stream. • Note 1: If the OEM motherboard has a regulator that is dedicated to the sensor alone, then a low loss linear regulator would be suitable as the dedicated supply. The output voltage to the sensor should be in the region 5 to 6VDC to limit the power dissipation on the sensor PCB. An example suitable regulator is LM78L05. Note 2: If supplying a number of sub-assemblies (eg sensor and clock), then a switchedmode power supply can be used, but the individual sub-assemblies should be wired in “star” formation so that noise generated on the power line by one sub-assembly does not affect the sensor sub-assembly. If that is a possible design solution, then BiancaMed could provide some advice on suitable SMPS and attendant circuitry. Though, the inherent stability and isolation that a dedicated power supply provides is much preferred. Analogue Sensor Data Where: Input: VDC = +4.5 to +12 VDC Shutdown = active low, connect to pin 2 to enable sensor Output: M-I= Movement I channel data R-I= Respiration I channel data M-Q= Movement Q channel data R-Q= Respiration Q channel data Figure 4: Pin out of Connector Note: Changes to pins 4, 5 & 6: no longer used, to be left floating Page 7 Parameter Value Movement I & Q Channel Signal bandwidth 50 mHz – 8 Hz DC offset voltage 1.25 Vdc Voltage range 0 – 2.5 Vdc Noise <8 mVrms R I & Q Channels Not used in this implementation Buffering Remarks See ADC below Reference voltage provided within the sensor to centre the analogue signal around 1.25Vdc It is recommended that pins 4, 5, 6, 8 & 10, which are not used in this implementation, are left unconnected. If, for production reasons, a full 10way ribbon cable is used, then pins 4, 5, 6, 8 & 10 should be terminated at the host motherboard and left floating, not tied to ground. The sensor module output See figure 5 below for pins 5, 7 & 9 must be followed examples by additional levels of buffering and isolation >30dB before interfacing with a user’s A/D circuitry Analogue to Digital The analogue signal is to be conversion (ADC) requirement digitised by the OEM motherboard at a rate of 64 samples per second (sps), with 10 to 12 bit precision. Post ADC, the sample rate is to be down sampled to 16 sps by averaging. Page 8 The 64 sps is to avoid Nyquist aliasing on the source signal (8Hz bandwidth). Down sampling then reduces the memory overhead for data buffering by the OEM motherboard. Example down sampling routine is available from BiancaMed From pin: V ref M-I M-Q Edge of MCU Figure 5: Example of Buffering of Sensor Pins Environmental Specifications Parameter Value Operating Temperature Range +15 to +35 deg C Operating Humidity Range 30 to 75% RH (non condensing) Storage Temperature range -20 to +60C Storage Humidity Range 20 to 95 RH (non-condensing) IP value Not Applicable Remarks To conform to IEC60065 To conform to IEC60065 IP value provided by OEM enclosure Parts & Materials Test Parameter Chemicals used in manufacture Standard no/name RoHS Page 9 Remarks Only Lead-free solder used in PCBA Test Parameter Chemicals/materials incorporated into product Standard no/name RoHS, WEEE directive Remarks Testing Standards/Conformance to Collateral/ International Standards Test Parameter Environmental test of packaged item Standard no/name IEC60065 Electrical safety test IEC60065 Electro Static Discharge IEC60601-1-2; EN61000-4-2 EMC – Radiation emitted IEC60601-1-2, ETSI EN 300 440-1, by the BM11 FCC part 15.245 EMC - Susceptibility to IEC60601-1-2 external radiation Device life Radio Standards 5 years by component analysis R&TTE Directive 1999/5/EC, FCC part 15.245, ARIB-std T73v1.1 Audio & video equipment safety requirements IEC60065 Remarks BM11 tested in a representative enclosure, but the OEM is responsible for confirming the compliance in the OEM enclosure BM11 tested in a representative enclosure, but the OEM is responsible for confirming the compliance in the OEM enclosure BM11 tested in a representative enclosure, but the OEM is responsible for confirming the compliance in the OEM enclosure BM11 tested in a representative enclosure, but the OEM is responsible for confirming the compliance in the OEM enclosure The sensor’s conformance to the relevant parts of IEC60065 is satisfied by the IEC60601 tests, a table of compliance is available from BiancaMed Page 10 Module Mounting & Product Integration Considerations • • • • The sensor module consists of a broadside pyramidal horn reflector antenna with a planar monopole feed. The module is encased in a “hard to access” plastic housing. Ideally, the BM11 sensor module would be positioned with no other components within 5 cm, to prevent the influence of other components on the RF tuning. It is recommended that OEMs liaise with BiancaMed during the preliminary design of the product enclosure to ensure the best positioning of the components within the product. The following design guidelines should be considered: o The antenna should not have any metallic object in its line of sight (the full cone angle as specified above). o There should be 5 to 10mm air gap between the mouth of the antenna and the enclosure skin. o The order of preference for the enclosure skin in the way of the antenna is: Nothing or a totally RF transparent material, eg speaker cloth. A planar surface of plastic. A curved surface of plastic, with no reinforcing ribs. OEMs should provide BiancaMed with an example of the intended product enclosure at the preliminary design stage. BiancaMed can then test the effects of the enclosure design on the sensor for shift in centre frequency or beam modification. No moving parts with an oscillating frequency below 10 Hz should exist within the product’s housing. Any internal movement may be detected by the BM11 sensor and thus lead to measurement inaccuracies. Interference from Internal Wireless Devices Other RF devices within the enclosure have the potential to interfere with the BM11 sensor; such effects will depend upon operating frequency, radiated power and antenna position. BiancaMed should be consulted if it is intended to incorporate other RF devices within, or in close proximity to the product. Page 11 Information for OEM User Leaflet & Labeling The following items are provided for OEMs to include in the user leaflets of products that incorporate the BiancaMed BM11 Sensor. The items are categorised as Mandatory and Information. • • Mandatory items are required by regulatory authorities to be included in device documentation. The Information items are for guidance and can be altered in tone and language to suit the house style. It is recommended that the draft device labels and user information leaflet are reviewed by BiancaMed to ensure their accuracy and regulatory compliance. Mandatory Device Label: (For US Market) 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. The final end product must be labeled in a visible area with the following: “Contains TX FCC ID: YAKBM11” or “Contains FCC ID: YAKBM11”.FCC ID: YAKBM11 User Leaflet: (For US Market) This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures: - Reorient or relocate the receiving antenna. - Increase the separation between the equipment and re ceiver. - Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Page 12 - Consult the dealer or an experienced radio/TV technician for help. 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. FCC Caution: Any changes or modifications not expressly approved by “OEM name” could void the user's authority to operate this equipment. Note for OEM: This transmitter module is authorized to be used in other devices only by OEM further transmitter testing will not be required. However, the OEM integrator is still responsible for testing their endproduct for any additional compliance requirements required with this module installed (for example, digital device emissions, PC peripheral requirements, etc.). The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the user manual of the end product. Information Device Information The non-contact sensor is a very low power Radio Frequency (RF) emitter. The RF power levels are much less than the BlueTooth on your mobile/cell phone and a WLAN router. The sensor has a maximum range of 1.5m and is designed to measure the breathing and body movement of an adult within range. If there are 2 persons in the bed, the sensor is will measure the parameters of the nearer person. Device Placement The product should be placed on a bedside table on the same side of the bed as the user. The height of the bedside table should ensure that there is a clear line of sight between the sensor and your upper chest when you are lying on the bed. This is typically a table top height of level with the mattress to around 6” (15cm) above the mattress. Do not place the product so that it has to “look” through the mattress at you: the springs in the mattress are likely to disrupt the RF beam. The product should be placed on the bedside table such that it is within easy arm’s reach of your normal sleeping position. Tips for initial setup: • • • Place the product on your bedside table as outlined above. Angle the product so that the screen is at an easy reading angle when you are lying down, and that the sensor (or front of the product) is aimed approximately at the top of your chest when in your normal sleeping position. Run the application with the live breathing display active. Page 13 • • • Lie on the bed in your normal sleeping position. After approximately 30 seconds, a breathing rate should be displayed. Continue to breath in a normal and steady rate, the displayed breathing rate should stabilise after approximately 1 minute. If you move, the breathing rate display should be suspended whilst you are moving and then return approximately 15 seconds after you cease moving. Small movements are ignored. If you get any periods of “absent” indicated during your test, the sensor is having difficulty locking on to you. If this happens, re-position the product so that there is a clear line of sight to your upper chest area, and if necessary, bring the product a bit closer. Device Specifications Parameter Centre frequency Antenna Beam width Value 10.525 GHz 50 to 60 deg Typical breathing detection range 1.5m Remarks +/- 10MHz ie 25 to 30 deg either side of direct line of sight Target aspect not important, ie can be sitting, lying down on back/side/front Page 14
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