Integration Guide

ManualsBrandsSierra Wireless ManualsElectronicsCellular/PCS WCDMA/LTE Modem

4117336

Rev 1.0

May 18, 2015

AirPrime AR7552

Hardware Integration Guide

Summary of content (24 pages)

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Hardware Integration Guide AirPrime AR7552 4117336 Rev 1.
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Hardware Integration Guide Important Notice Due to the nature of wireless communications, transmission and reception of data can never be guaranteed. Data may be delayed, corrupted (i.e., have errors) or be totally lost.
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Hardware Integration Guide SPECIFIC DISCLAIMERS OF LIABILITY: CUSTOMER RECOGNIZES AND ACKNOWLEDGES SIERRA WIRELESS IS NOT RESPONSIBLE FOR AND SHALL NOT BE HELD LIABLE FOR ANY DEFECT OR DEFICIENCY OF ANY KIND OF CELLULAR OR GPS (INCLUDING A-GPS) SERVICES. Patents This product may contain technology developed by or for Sierra Wireless Inc. This product includes technology licensed from QUALCOMM®. This product is manufactured or sold by Sierra Wireless Inc.
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Hardware Integration Guide Document History Version Date Updates 1.0 May 18, 2015 Creation based on document 4116922: AirPrime - AR7558 - Hardware Integration Guide - Rev1.0. 4117336 Rev 1.
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Contents 1. INTRODUCTION .................................................................................................. 7 1.1. General Features...............................................................................................................7 2. POWER INTERFACE ........................................................................................... 8 2.1. Power Supply ....................................................................................................................
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List of Tables Table 1. AirPrime AR7552 Embedded Module ............................................................................... 7 Table 2. Power Supply Requirements ............................................................................................. 8 Table 3. Power Supply Pads ........................................................................................................... 8 Table 4. AirPrime AR7552 Absolute Maximum Ratings..................................................
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1. Introduction 1.1. General Features The AirPrime AR7552 embedded modules are designed for the automotive industry. They support LTE, WCDMA air interface standards and shares hardware and firmware interfaces with the AirPrime AR5550 and AR855x. They also have Global Navigation Satellite System (GNSS) capabilities including GPS and GLONASS. The AirPrime AR7552 embedded modules are based on the Qualcomm MDM9615 wireless chipset and support the following bands. Table 1.
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2. Power Interface 2.1. Power Supply The AirPrime AR7552 embedded module is powered via a single regulated DC power supply, 3.7V nominal. The power supply requirements can be found in the following table. Table 2. Power Supply Requirements Power Supply Min Typ Max Units Main DC Power Input Range 3.4 3.7 4.2 V 0 to 1kHz - - 200 mVpp >1kHz - - 50 mVpp AR7552 - - tbd mA Power Supply Ripple Maximum Current draw AirPrime AR7552 does not support USB bus-powered operation.
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Hardware Integration Guide Power Interface Parameter ESD1 Min Max Units Primary, RX2 and GNSS antenna pads - Contact - ±8 kV All other signal pads - Contact - ± 1.5 kV 1 The ESD Simulator configured with 330pF, 1000Ω. Caution: The AirPrime AR7552 embedded modules are sensitive to Electrostatic Discharge. ESD countermeasures and handling methods must be used when handling the AirPrime AR7552 devices. 2.3.
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3. RF Specification This section presents the WWAN RF interface of the AirPrime AR7552 series of embedded modules. The specifications for the LTE, CDMA and WCDMA interfaces are defined. 3.1. LTE RF Interface This section presents the LTE RF Specification for the AirPrime AR7552. 3.1.1. LTE Max TX Output Power The Maximum Transmitter Output Power of the AirPrime AR7552 embedded modules are specified in the following table. Table 5.
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Hardware Integration Guide Table 6. RF Specification Conducted RX Sensitivity 3GPP (BW: 10MHz) – LTE Bands (Note 1, 4) Band Standard (dBm) (Note 2) Room Typical (dBm) Class A (Extreme) Typical (dBm) (Note 5) Class A Limit ( dBm) (Note 5) B2 -94.3 -101 -100 -95.5 B4 -96.3 -101.5 -101 -97 B5 -94.3 -102.5 -102 -95.5 B7 -94.3 -100 -99 -95.5 B17 -93.3 -102 -101 -94.5 Note 1: Dual receiver (SIMO) Per 3GPP TS 36.521-1 Rx Sensitivity Specification. Note 2: Per 3GPP Specification.
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Hardware Integration Guide 3.3. RF Specification WWAN Antenna Interface The specification for the WWAN Antenna Interface of the AirPrime AR7552 embedded modules are defined in the table below. Table 9.
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Hardware Integration Guide 3.4. RF Specification Primary Antenna Diagnostics The primary antenna diagnostic feature allows the AirPrime AR7552 embedded module to determine if the primary antenna connected to the module is: open, shorted or normal. The antenna connected to this interface needs to have a DC resistance to ground of 10 kΩ ± 1k embedded inside. The ARx55x FW accepts two limits which are used to evaluate the status of the antenna, representing the short and open thresholds.
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Hardware Integration Guide RF Specification The following example illustrates the Antenna states and resistance values for a typical limit setting. AT+ANTLIMT=2,839,1088 Table 15. RX2 Antenna Diagnostics Ranges Antenna State Min ADC Max ADC Antenna Resistance Range Short 0 839 ~ ≤ 7 kΩ Normal 841 1086 7 kΩ < x < 13 kΩ Open 1088 1900 ≥ 13 kΩ Note: 4117336 Highlighted numbers in the table above are programmed as shortLim and openLim using the +ANTLIMT command. Rev 1.
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4. Audio The AirPrime AR7552 supports both Analog and Digital audio interfaces. The following diagram illustrates the Audio subsystem and identifies where various AT commands affect the audio subsystem. Refer to document [7] for details of the AT commands. 4.1. Analog Audio The AirPrime AR7552 provides a mono differential analog audio interface. Table 16. Analog Audio Interface Pads Pad Name CD9 AUDIO1_IN_P CC10 AUDIO1_IN_M CE6 AUDIO1_OUT_P CE8 AUDIO1_OUT_M Table 17.
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Hardware Integration Guide 4.2. Audio Digital Audio The AirPrime AR7552 provides a 4-wire digital audio interface. This interface can be configured as either a PCM or an I2S. Table 18.
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5. Routing Constraints and Recommendations Layout and routing of the AirPrime AR7552 device in the application is critical to maintaining the performance of the radio. The following sections provide guidance to the developer when designing their application to include an AirPrime AR7552 device and achieve optimal system performance. 5.1.
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Routing Constraints and Recommendations Hardware Integration Guide Poor routing Correct routing The yellow traces cross the RF trace. There is no signal around the RF path. Figure 2. RF Routing Examples  Fill the area around the RF traces with ground and ground vias to connect inner ground layers for isolation.  Cut out ground fill under RF signal pads to reduce stray capacitance losses.  Avoid routing RF traces with sharp corners. A smooth radius is recommended. E.g.
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Routing Constraints and Recommendations Hardware Integration Guide Figure 4. 5.2. Antenna Microstrip Routing Example Power and Ground Recommendations Power and ground routing is critical to achieving optimal performance of the AirPrime AR7552 devices when integrated into an application. Recommendations:  Do not use a separate GND for the Antennas  Connections to GND from the AirPrime AR7552 should be flooded plane using thermal reliefs to ensure reliable solder joints.
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Routing Constraints and Recommendations Hardware Integration Guide 5.4. Interface Circuit Recommendations The recommended interface implementation is to use open-drain non-inverting buffers with pull-ups to the appropriate voltage reference. This allows a host processor operating at a different voltage to communicate with the AirPrime AR7552 using the appropriate voltage levels. The figure below is a reference circuit for a digital input signal to the AirPrime AR7552 device.
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Routing Constraints and Recommendations Hardware Integration Guide Table 19. The specification of RF Trace of The CCB, Main Port Main Port Table 20. Length-1 (mm) Length-2 (mm) Length-3 (mm) Angel 1 (degree) 3.9 19.79 5.86 135 Angel 2 (degree) 135 Width (mm) 1.58 The specification of RF Trace of The CCB, Diversity and GPS Port Length (mm) Width (mm) Diversity Port 24.35 1.58 GPS Port 27.01 1.58 * Diversity Port is for Rx only. The figure below is the RF trace in AR7552 CCB.
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6. Regulatory Information 6.1. Important Notice Because of the nature of wireless communications, transmission and reception of data can never be guaranteed. Data may be delayed, corrupted (i.e., have errors) or be totally lost.
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Hardware Integration Guide Regulatory Information a mobile-only exposure condition must not exceed the gain values presented in the table below:  5.0 dBi in Cellular band  5.0 dBi in PCS band  5.0 dBi in LTE Band 4  7.0 dBi in LTE Band 7  5.0 dBi in LTE Band 17 3. The AR7552 modem may transmit simultaneously with other collocated radio transmitters within a host device, provided the following conditions are met:  Each collocated radio transmitter has been certfied by FCC / IC for mobile application.
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7. References 7.1. Reference Documents The table below lists the reference specifications for this product. Table 21. Reference Specifications Ref Title Issuer [1] Recommended Minimum Performance Standards for cdma2000 High Rate Packet Data Access Terminal – C.S0033 3GPP2 [2] Recommended Minimum Performance Standards for cdma2000 Spread Spectrum Mobile Stations – C.