Philips Medical Systems North America MDL4851 2.4 GHz Radio Module User Manual

Philips Medical Systems North America Co. 2.4 GHz Radio Module Users Manual

Contents

Users Manual

Page 1 of 8 1 Patient Monitoring Quality & Regulatory Group 3000 Minuteman Road Mailstop 0490 Andover, MA 01810 Tel: (978) 659-7383 Fax: (978) 685-5624 Application Note: MDL4851-MODULE Prepared by: Delroy Smith Last revised: 22-Nov-06 The following information is intended for Philips internal use only. It is a guide for the incorporation of the MDL4851 module into Philips patient monitoring medical devices. Interested Philips engineers should contact the Wireless ER Manager for additional information and referral to specific design specialists. This document is an internally controlled document under the Philips Quality System. Philips Medical Systems
Page 2 of 8 2 1 Table of Contents 1 Table of Contents ..................................................................................................................... 2 2 Introduction............................................................................................................................... 2 3 Host Interface ........................................................................................................................... 3 4 Serial Connection ..................................................................................................................... 4 4.1 Serial Specification: ............................................................................................................ 4 4.2 Maximum User Data Rate: ................................................................................................. 4 5 MDL4851-MODULE RF Shielding. .......................................................................................... 5 6 MDL4851-MODULE Mounting Considerations. ....................................................................... 6 7 RF Input/Output, Antenna ........................................................................................................6 7.1 RF Transmitter Specifications ............................................................................................ 6 8 Fault Conditions ....................................................................................................................... 7 8.1 Over/ Under Voltage........................................................................................................... 7 8.2 Excessive Signal Level on Serial Input .............................................................................. 7 8.3 Excessive Data Rate on Serial Input.................................................................................. 7 9 Accompanying Documentation for products incorporating the MDL4851-MODULE ............... 8 2 Introduction The MDL4851-MODULE is a serial network adapter designed to be used with specialized medical devices manufactured by Philips Medical Systems (Figure 1). It enables the host medical device to wirelessly establish bi directional communication with other remote devices using the Philips’ 2.4GHz ROW infrastructure.
Page 3 of 8 3 Figure 1: MDL4851-MODULE Block Diagram 3 Host Interface The MDL4851 radio module interfaces to the host though a single I/O connector (Figure 2). Via this connector the host must supply DC power, signal ground and modulating data to the radio module. The communication between the host device and the radio module is a two wire asynchronous serial interface (Table 1). Figure 2: MDL4851-MODULE Interface Host Connector
Page 4 of 8 4 Pin Name I/O Function 1 Ground First of two ground connections for the module. 2 ITS_Tx OUT Serial data to host. 3 ITS_Rx IN Serial data from host. 4 Ground Second of two ground connections for the module. 5 +5 vdc + 5 vdc +/- 5%, Sinks 38 mA average, 320 mA Peak during radio Tx/Rx 6 Not Connected Table 1: Host Connector pin assignment 4 Serial Connection 4.1 Serial Specification: The interface to the Host is a serial communication link (Table 2): Æ Flow Control: Tx, Rx; no hardware flow control Æ Baud Rate: 115.2 kbaud; Æ Parity: No parity bit Æ Bits: 8 bits of data, plus 1 Start/Stop bits Æ Logic Levels: TTL levels, 5 volt tolerant. Logical Zero Logical One Conditions LOW HIGH 0.1 V max 100uA sink 0.55V max 24mA sink 2.9V min 100uA load ITS_Tx 2.3V min 24mA load ITS_Rx 0.6V max 2.2V min - Table 2: Serial Lines, Electrical DC Characteristics 4.2 Maximum User Data Rate: The maximum user data rate that the radio supports is 12 kbits/second in each direction. This maximum over the air data rate is fixed by design and cannot be modified by the user.
Page 5 of 8 55 MDL4851-MODULE RF Shielding. The module contains all necessary RF shielding. The host device does not need to provide additional shielding. The available module metal enclosure is optional, it is not needed to achieve EMC compliance.
Page 6 of 8 66 MDL4851-MODULE Mounting Considerations. The module is self-contained and can be mounted anywhere using the supplied threaded pem nuts. No special heat sinking considerations are required. There are no orientation constraints. 7 RF Input/Output, Antenna The MDL4851 Radio Module is approved for use with multiple antennas specified by Philips, part numbers M4842-61400 and M8100-66490. This antenna cannot be replaced with an antenna of a different type. However, antenna of equivalent gain & type to the qualified antennas can be used. The RF input and output of the MDL4851-MODULE is matched to 50 ohms. A coaxial cable brings the RF outside the metal enclosure. This cable uses a unique non standard connector manufactured by JST (JST part number AYUI-1S-12676-221). The coaxial cable connects to a JST to reversed TNC adapter made by Amphenol (Amphenol part number 031-6101) where the antenna plugs in. The antenna is made by Radial to Philips’ specifications (Philips specifications number A-M4842-61400-1, rev A). 7.1 RF Transmitter Specifications The following table summarizes general transmitter specifications (Table 3). For complete details (including details on the receiver section) refer to ES-M4840-90145: Parameter Specification Frequency range ISM Band: 2400-2483.5MHz Radio Channel assignment 48 Radio Channel assigned from 2401.056 MHz to 2482.272 MHz, with Channels Spacing: 1.728 MHz Frequency Control Frequency Control to select smart hopper operating frequencies, only 3 frequencies needed to achieve performance. A maximum of 6 channels can be selected from the list of 48 channels. RF Output Power FCC: 17 dBm +/-1dB (40 mW to 63 mW, nominal 50mW), into antenna load ETSI: 7.0 dBm +/-1dB (4 mW to 6.3 mW, nominal 5.0mW), into antenna load. Japan: 8.5 dBm +/-1dB (5.6 mW to 8.9 mW, nominal 7.1mW), into antenna load. Note: a) Antenna gain is 2.0dBi max Transceiver frequency accuracy during normal operation <+60/-100KHz relative to channel frequency, includes temperature compensation & aging effects.
Page 7 of 8 7Modulation type GFSK, Gaussian Frequency Shift keying (1M40Q7D) Modulation Bandwidth Typically 1.4MHz (20dB Bandwidth) Out of band spurious emission Levels < -41dBm in 1MHz bandwidth for FCC limit Meets ETSI, RS210, FCC, ARIB standards Table 3: MDL4851 Radio Module, Transmitter Specifications Applicable Regulatory Rule Allowed channels Operating Frequency Range Max Power from Antenna (EIRP) ETSI 1-46 2402.784 - 2480.544 MHz 10 dBm FCC, RS-210 0-47 2401.056 - 2482.272 MHz 20 dBm JAPAN, ARIB 0-47 2401.056 - 2482.272 MHz 12.1dBm AUS/NZ 1-46 2402.784 - 2480.544 MHz 10 dBm Table 4 Radio Specification, MDL4851 Channel Frequency Rules 8 Fault Conditions 8.1 Over/ Under Voltage The input voltage from the DC power source to the module must remain between the values specified in Table 1. Operating the radio module from a voltage lower source lower than 4.75VDc or higher that 5.25 vdc can cause the regulator section to shut down ceasing operation of the radio module. 8.2 Excessive Signal Level on Serial Input The data input signal levels must be observed as specified in Table 2. Driving the input data line over 5 vdc can cause damage to the radio module input buffers, causing interruption of data transfer. 8.3 Excessive Data Rate on Serial Input The host serial communication data rate is fixed at 115.2 kbaud. Clocking data at different baud rates will result in incorrect data transfer. The maximum host/user over the RF link data rate is 12 kbps. Attempting to send data at a faster rate will result in data buffer overrun and data loss.
Page 8 of 8 89 Accompanying Documentation for products incorporating the MDL4851-MODULE Products which incorporate this device will be labeled “Contains FCC ID: PQC-MDL4851”, and their accompanying documentation should prominently display the following: Self declaration FCC logo ‘This device complies with part 15 of the FCC Rules. Operation is subject to the condition that this device does not cause harmful interference’

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