Sierra Wireless AirPrime AR7558 Hardware Integration Manual
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Sierra Wireless AirPrime AR7558 Hardware Integration Manual

Sierra Wireless AirPrime AR7558 Hardware Integration Manual

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Hardware Integration Guide
AirPrime AR7558
4116922
1.1
March 9, 2015

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Summary of Contents for Sierra Wireless AirPrime AR7558

  • Page 1 Hardware Integration Guide AirPrime AR7558 4116922 March 9, 2015...
  • Page 2 Data may be delayed, corrupted (i.e., have errors) or be totally lost. Although significant delays or losses of data are rare when wireless devices such as the Sierra Wireless modem are used in a normal manner with a well-constructed network, the Sierra Wireless modem should not be used in situations where failure to transmit or receive data could result in damage of any kind to the user or any other party, including but not limited to personal injury, death, or loss of property.
  • Page 3 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. or its affiliates under one or more patents licensed from InterDigital Group and MMP Portfolio Licensing. Copyright ©...
  • Page 4 Hardware Integration Guide Document History Version Date Updates Creation based on document 4114188: AirPrime - AR7558 - Hardware January 21, 2015 Integration Guide - Rev1.0. Some correction for power tolerance – Rev1.1 March 9, 2015 4116922 Rev 1.1 January 21, 2015...

  • Page 5: Table Of Contents

    Contents 1. INTRODUCTION ....................11 1.1. General Features ......................11 2. FUNCTIONAL SPECIFICATIONS ..............12 2.1. Modes of Operation ......................12 2.2. Communications Functions ..................... 12 2.3. Block Diagram ......................... 13 3. HARDWARE SPECIFICATIONS ................ 14 3.1. Environmental Specifications ..................14 3.2.
  • Page 6 Hardware Integration Guide 6. BASEBAND SPECIFICATION ................30 6.1. Power Supply ........................30 6.1.1. Under-Voltage Lockout (UVLO) ................30 6.2. VCOIN ..........................31 6.3. ON/OFF Control ......................32 6.3.1. ON/OFF Timing ......................32 6.3.2. Software-Initiated Power Down ................34 6.3.3. Deep Sleep.......................
  • Page 7 Hardware Integration Guide 7.4. Interface Circuit Recommendations ................55 8. REGULATORY INFORMATION ................. 56 8.1. Important Notice ......................56 8.2. Safety and Hazards ......................56 8.3. Important Compliance Information for USA OEM Integrators ......... 56 9. REFERENCES ....................59 10. ABBREVIATIONS ....................60 4116922 Rev 1.1 January 21, 2015...
  • Page 8 AirPrime AR7558 Mechanical Dimensions Drawing ............16 Figure 4. AirPrime AR7558 Footprint ..................... 17 Figure 5. AirPrime AR7558 Recommended Application Land Pattern ........... 17 Figure 6. AirPrime AR7558 Heatsink Contact Area ............... 18 Figure 7. VGNSS_ANT vs. ADC Readings Relationship ............... 26 Figure 8.
  • Page 9 AirPrime AR7558 Absolute Maximum Ratings ..............14 Table 6. AirPrime AR7558 Embedded Module Dimensions ............15 Table 7. AirPrime AR7558 Maximum LTE Transmitter Output Power .......... 19 Table 8. AirPrime AR7558 Minimum LTE Receiver Sensitivity ............. 19 Table 9. AirPrime AR7558 Maximum CDMA Transmitter Output Power ........20 Table 10.
  • Page 10 Hardware Integration Guide Table 38. Period of Wake Intervals ....................34 Table 39. Deep Sleep Function Availability ..................34 Table 40. USB Pad Details ......................35 Table 41. USB Characteristics ......................36 Table 42. UART Pads ........................36 Table 43. Ring Indicator Pad ......................

  • Page 11: Introduction

    1.1. General Features The AirPrime AR7558 embedded modules are designed for the automotive industry. They support LTE, CDMA, 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.

  • Page 12: Functional Specifications

    2. Functional Specifications This chapter highlights the features of the AirPrime AR7558 series of embedded modules. 2.1. Modes of Operation The AirPrime AR7558 supports 2G/3G/4G operations and also supports GNSS operation. For complete details, refer to the table below. Table 2.

  • Page 13: Block Diagram

    Hardware Integration Guide Functional Specifications 2.3. Block Diagram Figure 1. AirPrime AR7558 Block Diagram 4116922 Rev 1.1 January 21, 2015...

  • Page 14: Hardware Specifications

    Unless otherwise stated, full performance should return to normal after the excessive constraint(s) have been removed. 3.2. Electrical Specifications This section provides details for some of the key electrical specifications of the AirPrime AR7558 embedded modules. 3.2.1. Absolute Maximum and ESD Ratings This section defines the Absolute Maximum and Electrostatic Discharge (ESD) Ratings of the AirPrime AR7558 embedded modules.

  • Page 15: Mechanical Specifications

    3.3.1. Physical Dimensions and Connection Interface The AirPrime AR7558 embedded modules are a Land Grid Array (LGA) form factor device. The device does not have a System or RF connectors. All electrical and mechanical connections are made via the 303 pad LGA on the underside of the PCB.

  • Page 16: Mechanical Drawing

    Hardware Integration Guide Hardware Specifications 3.3.2. Mechanical Drawing Figure 2. AR55x Assembly Drawing Figure 3. AirPrime AR7558 Mechanical Dimensions Drawing The dimensions in this document’s figures are preliminary and subject to change. Note: 4116922 Rev 1.1 January 21, 2015...

  • Page 17: Footprint

    3.3.3. Footprint The AirPrime AR7558 device LGA footprint is a 303 pad array of 0.9mm, 1.45mm, and 1.90mm pads. The following drawing illustrates the device footprint. The application footprint is recommended to mirror the device footprint as illustrated in the following drawing (subject to change).

  • Page 18: Thermal Consideration

    Hardware Specifications 3.3.4. Thermal Consideration The AirPrime AR7558 device is designed to work over an extended temperature range. In order to do this efficiently a method of sinking heat from the product is recommended. Refer to application notes (TBD) for details.

  • Page 19: Rf Specification

    4. RF Specification This section presents the WWAN RF interface of the AirPrime AR7558 series of embedded modules. The specifications for the LTE, CDMA and WCDMA interfaces are defined. 4.1. LTE RF Interface This section presents the LTE RF Specification for the AirPrime AR7558.

  • Page 20: Cdma Max Tx Output Power

    Hardware Integration Guide RF Specification 4.2.1. CDMA Max TX Output Power The Maximum Transmitter Output Power of the AirPrime AR7558 embedded module is specified in the following table. Table 9. AirPrime AR7558 Maximum CDMA Transmitter Output Power Band Class Frequency Band...

  • Page 21: Wwan Antenna Interface

    869 MHz to 894 MHz -106 dBm (Class B) 4.4. WWAN Antenna Interface The specification for the WWAN Antenna Interface of the AirPrime AR7558 embedded modules are defined in the table below. Table 13. AirPrime AR7558 WWAN Antenna Characteristics CDMA BC0,...

  • Page 22: Primary Antenna Diagnostics

    16383 Voltage/ADC step ~0.0011 Volts 1 Assumes 10kΩ Nominal DC resistance in the attached antenna and internal to AirPrime AR7558 device The following example illustrates the Antenna states and resistance values for a typical limit setting. AT+ANTLIMT=1,839,1088 Table 17. Primary Antenna Diagnostics Ranges...

  • Page 23: Table 18. Rx2 Antenna Adc Characteristics

    Hardware Integration Guide RF Specification The AirPrime AR7558 FW accepts two limits which are used to evaluate the status of the antenna, representing the short and open thresholds. Refer to document [7] for the syntax of AT+ANTLIMT. Table 18. RX2 Antenna ADC Characteristics...

  • Page 24: Gnss Specification

    2.5 dB Noise Figure. 5.2. GNSS Antenna Interface The specification for GNSS Antenna Interface is defined in the table below. The AirPrime AR7558 provides biasing for an active antenna as well as onboard circuitry for diagnostics of this antenna interface.

  • Page 25: Gnss Antenna Recommendations

    Hardware Integration Guide GNSS Specification Minimum isolation between the GNSS and WWAN Antenna must be 10 dB for the AirPrime AR7558. Table 22. GNSS Antenna Interface Pads Name Direction Function GNSS Antenna Ground GNSS_ANT Input GNSS Antenna Interface GNSS Antenna Ground 5.2.1.

  • Page 26: Figure 7. Vgnss_Ant Vs. Adc Readings Relationship

    Hardware Integration Guide GNSS Specification The following table identifies some key VGNSS_ANT current draw values and the associated ADC values. Table 25. VGNSS_ANT Current Draw I (mA) Nominal 1242 1558 1877 2194 2494 2821 3188 3444 3747 4065 4292 4319 The graph below illustrates the relationship between current drawn on VGNSS_ANT vs the ADC readings used to monitor the GNSS Antenna status.

  • Page 27: Current Consumption

    GNSS Power Supply and Antenna Diagnostics Block Diagram 5.4. Current Consumption The table below summarizes some key current consumption values for various modes of the AirPrime AR7558 devices. Table 26. AirPrime AR7558 Current Consumption Values Mode Parameter Typical Units Maximum TX Output – 1xRTT/1xEVDO On Call –...

  • Page 28: Digital Io Characteristics

    Hardware Integration Guide GNSS Specification Mode Parameter Typical Units USB Enumerated Registered Idle – LTE USB Not Enumerated Searching for network – LTE Average current, QPCH, SCI=2 Sleep Mode Average current, WCDMA, DRX=8 Average current, LTE μA Power OFF Current Acquisition (Airplane mode, cold start) GNSS Tracking (Registered)

  • Page 29: Internal Device Frequencies

    Digital IOs shall not be pulled-up to an external voltage as this may cause VCC_1V8 to not go low when the AirPrime AR7558 device is powered down. Also, this would partially bias the AirPrime AR7558 device which could potentially damage the device or result in GPIOs being set to undetermined levels.

  • Page 30: Baseband Specification

    VBATT falls below the threshold. Figure 9. Under-Voltage Lockout (UVLO) Diagram The AirPrime AR7558 will power down and remain off until the level of VBATT returns to the valid range and the ON/OFF signal is active. 4116922 Rev 1.0...

  • Page 31: Vcoin

    Hardware Integration Guide Baseband Specification Note: If the AirPrime AR7558 device has 6 UVLO events without a valid power down or reset sequence, it enters a mode in which only the DM port enumerates on the USB. Table 31. UVLO Thresholds...

  • Page 32: On/Off Control

    6.3.1. ON/OFF Timing The ON/OFF pin is a low pulse toggle control. The first pulse powers the AirPrime AR7558 ON, a second pulse instructs the AirPrime AR7558 to begin the Shutdown process. The diagram below illustrates the recommended application implementation for ON/OFF control.

  • Page 33: Figure 11. Alternate On/Off Control

    OFF pulse is complete and when shutdown is completed by pwroff the AirPrime AR7558 devices. This duration is network and device dependent, i.e. in a CDMA network a power down registration is initiated by the AirPrime AR7558 device, when the acknowledgement is received from the network power OFF completes.

  • Page 34: Software-Initiated Power Down

    Mode portion of the current consumption tables in section 5.4 Current Consumption. The Slot Cycle Index is the lower of the values stored in the AirPrime AR7558 or the value being broadcast by the wireless network that the AirPrime AR7558 is registered on.

  • Page 35: Sequence To Enter Deep Sleep Mode

    6.3.3.1. Sequence to Enter Deep Sleep Mode The following list defines the sequence needed by the application to allow the AirPrime AR7558 to enter Deep Sleep mode: 1. AR7558 has registered on the WWAN network (or callbox), and is not in a call.

  • Page 36: Uart

    Maximum Input Capacitance (Min ESR = 50 mΩ) 1 With the AirPrime AR7558 device powered ON. 6.5. UART The AirPrime AR7558 has two UART interfaces. The primary UART is an 8-wire electrical interface and the secondary UART is a 2-wire electrical interface. Table 42.

  • Page 37: Uim Interface

    UIM_DETECT is used to detect the physical presence of a SIM/UIM card in the holder. It has a 3.0uA to 30µA pull-up to 1.8V inside the AirPrime AR7558. It should be set to GND if a SIM/UIM is present. All signals must be ESD-protected near the UIM holder.

  • Page 38: General Purpose Io

    Refer to the Digital IO Characteristics section for electrical characteristics of these signals. 6.8.1. AT Port Switch The AirPrime AR7558 supports switching the active AT command port between USB and UART. Table 46. AT Port Switch States Name State AT Port...

  • Page 39: I 2 C

    C signals are open drain outputs with 2.2 kΩ pull-up resistors to VCC_1V8 internal to the AirPrime AR7558. 6.11. Voltage Reference The AirPrime AR7558 utilizes 1.8V logic. A voltage reference output for this rail is provided below. Table 49. Voltage Reference Pad...

  • Page 40: Adc

    Ground the signal when necessary to RESET the module. Note: Use of the RESIN_N signal to RESET the AirPrime AR7558 could result in memory corruption if used inappropriately. This signal should only be used if the AirPrime AR7558 has become unresponsive and it is not possible to perform a power cycle.

  • Page 41: Led

    Units Full-Scale Voltage Level ADCx Resolution Input Impedance >4 MΩ 6.14. LED The AirPrime AR7558 provides an LED control output signal pad. This signal is an open drain input. Table 55. LED Interface Pad Name Direction Function If Unused Output...

  • Page 42: Digital Audio

    1 Direction when defined in Master mode. 6.15.2.1. The AirPrime AR7558 PCM interface can be configured in one of two modes: primary PCM or auxiliary PCM mode. The table below defines the configurations for each of these two modes. Table 59.

  • Page 43: Figure 18. Pcm_Fs Timing Diagram (2048 Khz Clock)

    D – Data  V – Volume padding 6.15.2.1.2. Primary PCM Timing The table and drawings below illustrate the PCM signals timing when the AirPrime AR7558 module is operating in Primary PCM mode. Table 60. Primary PCM Timing Parameter Description...

  • Page 44: Figure 19. Pcm Codec To Ar Device Timing Diagram (Primary Pcm)

    AR Device to PCM Codec Timing Diagram (Primary PCM) 6.15.2.1.3. Auxiliary PCM Timing The table and drawings below illustrate the timing of the PCM signals when the AirPrime AR7558 module is operating in Auxiliary PCM mode. Table 61. Auxiliary PCM Timing...

  • Page 45: I2S

    DAC/ADC. The I2S interface is a 4-wire interface: serial clock (I2S_SCLK), word select (I2S_WS), serial uplink data (I2S_DIN), and serial downlink data (I2S_DOUT). The AirPrime AR7558 I2S interface can be configured as a master or slave and either transmitter or receiver.

  • Page 46: Figure 24. I2S Signals Timing Diagram

    6.15.2.2.1. I2S_DIN and I2S_DOUT The serial PCM stereo-data stream for both channels are output from the AirPrime AR7558 on the I2S_DOUT signal pin and input on the I2S_DIN signal pin. Serial data is transmitted in two’s complement, with the MSB first. The transmitter and receiver are not required to have the same word length: ...

  • Page 47: Spi Bus

    Hardware Integration Guide Baseband Specification 6.16. SPI Bus The AirPrime AR7558 embedded module provides one SPI bus (4-wire interface). SPI bus interface includes:  A CLK signal  An O signal  An I signal  A CS (Chip Select) signal 6.16.1.

  • Page 48: Spi Pin Description

    Hardware Integration Guide Baseband Specification Table 63. SPI Master Timing Characteristics Parameter Unit SPI clock frequency SPI clock period t(ch) Clock high t(cl) Clock low t(mov) Master output valid t(mis) Master input setup t(moh) Master output hold t(tse) Tri-state enable t(tsd) Tri-state disable 6.16.4.

  • Page 49: Hsic Bus

    Hardware Integration Guide Baseband Specification 6.17. HSIC Bus The AirPrime AR7558 embedded module provides one HSIC bus (2-wire interface). HSIC bus interface includes:  HSIC strobe signal  HSIC data signal  Calibration pad for HSIC port signal 6.17.1. HSIC Pin Description Refer to the following table for the HSIC interface pin description.

  • Page 50: Application

    Hardware Integration Guide Baseband Specification 6.17.3. Application A 4-wire SPI configuration has the input and output data lines disassociated. HSIC_Ready HSIC_STB Customer AirPrime AR755X Application HSIC_DATA HSIC_CAL 240ohm Figure 28. Example of HSIC Bus Application Note: Trace length to 10cm maximum Skew between data and strobe signals <...

  • Page 51: Temperature Monitoring

    Hardware Integration Guide Baseband Specification 6.18. Temperature Monitoring The AirPrime AR7558 has internal temperature monitoring of both the PMIC device and the Power Amplifier devices. Application asserts ON/OFF High Temperature Critical current_temp < TEMP_HI_WARN Issues AT!POWERDOWN (Low power mode) current_temp > TEMP_HI_CRIT current_temp >...

  • Page 52: Routing Constraints And Recommendations

    7. Routing Constraints and Recommendations Layout and routing of the AirPrime AR7558 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 AR7558 device and achieve optimal system performance.

  • Page 53: Figure 31. Rf Routing Examples

    Routing Constraints and Hardware Integration Guide Recommendations Poor routing Correct routing The yellow traces cross the RF trace. There is no signal around the RF path. Figure 31. RF Routing Examples  Fill the area around the RF traces with ground and ground vias to connect inner ground layers for isolation.

  • Page 54: Power And Ground Recommendations

    Figure 33. Antenna Microstrip Routing Example 7.2. Power and Ground Recommendations Power and ground routing is critical to achieving optimal performance of the AirPrime AR7558 devices when integrated into an application. Recommendations:  Do not use a separate GND for the Antennas ...

  • Page 55: Interface Circuit Recommendations

    This allows a host processor operating at a different voltage to communicate with the AirPrime AR7558 using the appropriate voltage levels. The figure below is a reference circuit for a digital input signal to the AirPrime AR7558 device. VCC_1V8...

  • Page 56: Regulatory Information

    Sierra Wireless and its affiliates accept no responsibility for damages of any kind resulting from delays or errors in data transmitted or received using Sierra Wireless modem, or for failure of the Sierra Wireless modem to transmit or receive such data.
  • Page 57 2400-2500 1. Valid collocated Transmitter combinations: WLAN+BT; WiMAX+BT. (WLAN+WiMAX+BT is not permitted.) 4. A label must be affixed to the outside of the end product into which the AirPrime AR7558 device is incorporated, with a statement similar to the following:...
  • Page 58 Hardware Integration Guide Regulatory Information Note: If this module is intended for use in a portable device, you are responsible for separate approval to satisfy the SAR requirements of FCC Part 2.1093 and IC RSS-102. 4116922 Rev 1.1 January 21, 2015...

  • Page 59: References

    USB Implementers Forum Communication Devices Universal Serial Bus Class Definitions for Communication Devices USB Implementers Forum AirPrime AR Series Customer Process Guidelines Sierra Wireless AirPrime AR7 Series AT Command Interface Specification Sierra Wireless AirPrime AR7 Series Firmware Download Guide Sierra Wireless 4116922 Rev 1.0...

  • Page 60: Abbreviations

    10. Abbreviations The table below lists several abbreviations used in this document. Table 68. Abbreviations Abbreviation Description CDMA Code Division Multiple Access Discontinuous Receive GNSS Global Navigation Satellite System Global System for Mobile Communications HSPA High Speed Packet Access Long Term Evolution Slot Cycle Index Universal Serial Bus WCDMA...

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