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User Manual for unicorecomm models including: UM220-IV L Single Frequency Multi-GNSS Timing Module, UM220-IV L, Single Frequency Multi-GNSS Timing Module, Multi-GNSS Timing Module, Timing Module
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DocumentDocumentINSTALLATION AND OPERATION USER MANUAL WWW.UNICORECOMM.COM UM220-IV L Single Frequency Multi-GNSS Timing Module Copyright© 2009-2022, Unicore Communications, Inc. Data subject to change without notice. Revision History Version Revision History R1 Initial version R1.1 Update the range of VCC and V_BCKP R1.2 R1.3 Add the Note in Section 4.2 If hot start is not used, connect V_BCKP to VCC. Revise the VSWR in Table 1-2 Date 2020-01-06 2021-08-31 2021-11-17 2022-11-29 Disclaimer This manual provides information about the products of Unicore Communications, Inc. This document does not transfer the patent, trademark, copyright of the company or any third party, or any right or permission under it by implication, estoppel or otherwise. Except as stated in the sales terms and conditions of the products, the company shall not assume any other responsibilities. Furthermore, Unicore Communications, Inc. makes no warranty, express or implied, for the sale and/or use of its products, including the suitability of a particular purpose and marketability of products, or liability for infringement of any patent, copyright or other intellectual property rights. If the connection or operation is not in accordance with the manual, the company is not liable. Unicore Communications, Inc. may make changes to product specifications and product descriptions at any time without prior notice. The company's products may contain certain design defects or errors, which will be included in the corrigendum once found, and may therefore result in differences between the products' actual specifications and the published ones. Updated corrigendum is available upon request. Before placing an order, please contact our company or local distributors for the latest specifications. * Unicore Communications, UNICORECOMM, UFirebird and its logo have been applied for trademark registration by Unicore Communications, Inc. Other names and brands are the property of their respective owners. © Copyright 2009-2022 Unicore Communications, Inc. All rights reserved. i UM220-IV L User Manual Foreword This document describes the product features and information of the hardware design, installation, specification and the use of UNICORECOMM UM220-IV L module. Audience This manual is created for the technical personnel, who possess the expertise of GNSS receivers. ii Contents Contents.......................................................................................................................... i 1 Product Introduction............................................................................................... 1 1.1 Overview ...........................................................................................................................1 1.2 Features............................................................................................................................2 1.3 Block Diagram..................................................................................................................2 1.4 Performance.....................................................................................................................3 1.5 Precision Timing and Raw Data Output.........................................................................4 1.6 Pulses per Second (1PPS) ..............................................................................................5 1.7 UART .................................................................................................................................5 1.8 Protocol ............................................................................................................................5 1.9 Clock .................................................................................................................................6 1.10 Antenna ............................................................................................................................6 2 Installation .............................................................................................................. 7 2.1 Prerequisites ....................................................................................................................7 2.2 Installation .......................................................................................................................8 3 Technical Specifications ........................................................................................ 9 3.1 Electrical Specifications ..................................................................................................9 3.2 Operating Conditions.......................................................................................................9 3.3 Mechanical Specifications............................................................................................10 3.4 Pin Definition..................................................................................................................11 3.5 PCB Packaging ..............................................................................................................14 4 Hardware Design .................................................................................................. 15 4.1 Power Supply VCC .........................................................................................................15 4.2 Antenna Design..............................................................................................................15 4.2.1 Passive Antenna ........................................................................................................15 4.2.2 Active Antenna ...........................................................................................................16 4.2.3 Active Antenna State Detection................................................................................18 4.3 UART ...............................................................................................................................20 i UM220-IV L User Manual 4.4 RESET Time Sequence ..................................................................................................21 4.5 TIME PULSE Output .......................................................................................................21 4.6 Layout Recommendation ..............................................................................................22 5 Packaging ............................................................................................................. 23 5.1 Product Labeling............................................................................................................23 5.2 Packaging Description ..................................................................................................23 6 Soldering and Disassembly..................................................................................25 6.1 Disassembly...................................................................................................................25 6.2 Clean ...............................................................................................................................25 6.3 Reflow Soldering ............................................................................................................25 ii 1 Product Introduction 1.1 Overview UM220-IV L is a GNSS multisystem, high-precision timing module, based on the low power, multisystem, high-performance SoC-UFirebird independently developed by UNICORECOMM. It supports GPS, BDS, GLONASS and Galileo, etc. Moreover, it is capable to receive and process data of two or three systems concurrently, or work on a single system. UM220-IV L module supports SBAS, QZSS and DGNSS input function, and provides the advanced AGNSS function. It can improve the positioning speed through the assistant data service of UNICORECOMM in the scenario of networking. With the combined function of filter, linear amplifier and antenna protection, and optimized RF architecture and interference rejection capability, UM220-IV L module provides the reliable performance in complex electromagnetic environments. UM220-IV L module supports various timing modes including fixed-location timing, optimized-location timing and positioning timing, which ensure the good timing accuracy even in complex signal environmental conditions. UM220-IV L module features compact dimensions, SMT PADS, full-automatic integration of standard pick-and-place and reflow soldering, and is especially suitable for low-cost, low-power applications. UC-00-M15 EN R1.3 Product Introduction 1 Professional Automotive GPS/QZSS BDS GLONASS Galileo 3.0V UART 1 UART 2 Antenna Detection 1PPS Antenna Feed Built-in flash Update Rate AGNSS DGNSS 1.2 Features Table 1- 1 Product Feature Variant Grade Size UM220-IV L User Manual GNSS Supply Interfaces Features UM220IV L 17x22 mm 1 Hz 1.3 Block Diagram UM220-IV L SAW LNA Power Supply Antenna Supply & Supervisor Antenna Supply GNSS IC TCXO RTC Crystal Figure 1- 1 UM220-IV L Block Diagram RESET_N UART PPS UC-00-M15 EN R1.3 Product Introduction 2 1.4 Performance Table 1- 2 Specifications Power Voltage 3.0~3.6VDC Power Consumption1 62mW @3.3V RF Input VSWR 2.5 Input Impedance 50 Antenna Gain 535dB Physical Characters Dimensions 17.0mm*22.4mm*2.4mm Weight 1.7g Environment Operating Temperature -40 ~ +85 Storage Temperature -40 ~ +85 RoHS2.0 Compliant Input/ Output Data Interface UART UART*2, LVTTL. Baud Rate: 4800~115200 bps GNSS Performance Constellations TTFF2 (Time to First Fix) BDS B1: 1561.098MHZ GPS L1: 1575.42MHZ GLONASS L1OF: 1602MHZ Galileo E1-B/C: 1575.42MHZ Cold Start: 28s Hot Start: 1s Reacquisition: 1s AGNSS3: 4s Positioning Accuracy (CEP)4 2.0m (Horizontal) 3.5m (Vertical) Velocity Accuracy (RMS)5 0.1m/s (Horizontal) Sensitivity6 Cold Start GPS BDS -147dBm -144dBm GLONASS -142dBm Galileo -135dBm 1 Continuous positioning, typical value 2 All satellites C/N0 at 41 3 Assisted data injection in time 4 All satellites C/N0 at 41 5 All satellites C/N0 at 41 6 Tested with a good external LNA UC-00-M15 EN R1.3 Product Introduction 3 1PPS (RMS)7 Data Update Rate Format UM220-IV L User Manual Tracking -160dBm -160dBm -158dBm Hot Start -155dBm -151dBm -150dBm Reacquisition -155dBm -151dBm -150dBm 20ns 1Hz NMEA 0183Unicore ProtocolRTCM3.2 -154dBm -143dBm -140dBm 1.5 Precision Timing and Raw Data Output UM220-IV L module supports three timing modes: fixed-location timing, optimizedlocation timing and positioning timing. Switch or query the above timing modes through CFGTM. It can also track all four GNSS systems including GPS, BDS, GLONASS and Galileo, and switch back and forth between these four systems using CFGGNSS. UM220-IV L module is set to optimized-location timing mode by default, and outputs information of real-time position and site-specific position, which can be queried by TIMPPOS. Refer to UM220-IV L_Protocol Specification for more details. Fixed-location Timing Fixed-location timing mode is applied to static scenes. In this mode, users are required to input the exact position of receiver antenna center through CFGTM manually, which are used by UM220-IV L module to calculate the distance between the antenna and the satellite, and calculate time to perform timing service. Optimized-location Timing Optimized-location timing mode is another application used in static scenes. In this mode, the receiver collects a set number of positioning points (within observation time) and calculates the exact position of the antenna. After that, the exact position is locked down, and the timing mode is switched to the fixed-location timing mode. The observation time and accuracy are configured through CFGTM, but only when both above-mentioned conditions are met to use fixed-location timing mode. Query the observation status through TPFINFO. The position estimation process is only required once after the UM220-IV L is installed. When the position optimization is completed, the timing mode set in the receiver automatically switches to the fixed-location timing mode. 7 Open sky UC-00-M15 EN R1.3 Product Introduction 4 If the position of UM220-IV L antenna changes, the command CFGTM must be sent again to switch the timing mode back to the optimized position mode to recalibrate the antenna position. Refer to UM220-IV L_ Protocol Specification for more details. Positioning Timing Positioning timing is the only timing mode that supports dynamic timing. In this mode, UM220-IV L calculates the antenna position and time in real time. The timing quality depends on the satellite environment, and it is difficult to guarantee the timing accuracy. 1.6 Pulses per Second (1PPS) UM220-IV L module provides a pulse width output and 1PPS signal of which the pulse polarity is adjustable, and can be configured and queried through CFGTP. TIMTP is used to describe the related 1PPS information including the corresponding time and time accuracy indicators. 1.7 UART Two UART interfaces are integrated in the UM220-IV L module. UART1 is the master serial port, supports data transmission and firmware upgrade, the I/O signal type is LVTTL. The Default Baud rate is 115200bps and the baud rate can be configured by users. Please ensure that UART1 is connected to a PC or external processor to support firmware upgrade. Serial 2 only supports data transmission and is unavailable for firmware upgrade, only for backup. 1.8 Protocol Table 1- 3 Supported Interface Protocols Protocol Type NMEA0183 I/O, ASCII, NMEA3.0, NMEA4.1Default output Unicore Protocol I/O, ASCII, Unicore Protocol RTCM8 Input, RTCM3.2 8 Refer to UM220-IV L_Protocol Specification for more details UC-00-M15 EN R1.3 Product Introduction 5 UM220-IV L User Manual 1.9 Clock The industrial TCXO is built into the UM220-IV L module to ensure the stability of the clock system and the ability to capture signals quickly in weak signal environments. UM220-IV L also integrates the 32k crystal to maintain the RTC clock. When the main power supply is removed, the normal operation of the RTC can be maintained by providing V_BCKP. 1.10 Antenna The filter and linear amplifier are built in the UM220-IV L module. They support active antennas and passive antennas, and the former provides better performance. UC-00-M15 EN R1.3 Product Introduction 6 2 Installation 2.1 Prerequisites Most components on the UM220-IV L module are static sensitive devices (SSD) and require ESD protection for IC circuits and other devices. Perform the following protection measures before opening antistatic plastic boxes. Perform the steps in section 2.2 Installation in the correct order; Electrostatic discharge (ESD) may cause a damage to the device. All operations referred to in this section should be performed on an ESD workbench using wrist straps and conductive foam pads. If there is no anti-static workbench, wear wrist straps and connect their other ends to the metal frame to avoid electrostatic damages; Hold the edge of the module, do NOT touch the components directly; Carefully check the module for any apparent loose or damaged components. If there are any questions, please contact Unicore or the local distributors. Figure 2- 1 Typical Installation of UM220-IV L shows the typical installation of the UM220-IV L EVK. Antenna PC Built in UM220-IV L EVK or the receiver Figure 2- 1 Typical Installation of UM220-IV L Have the following accessories ready before starting the installation: UM220-IV L EVK (including a power supply) UM220-IV L User Manual uSTAR_L executable file UC-00-M15 EN R1.3 Installation 7 UM220-IV L User Manual Qualified GNSS antennas Antenna cable Straight-through cable Desktop or laptop computer with serial port and installed with uSTAR_L Please keep the packing box and anti-static box for storage and handling. 2.2 Installation Follow the below steps to install UM220-IV L and EVK. Step 1. Ensure adequate anti-static measures, such as wrist straps, workbench grounding, etc. Step 2. Open UM220-IV L EVK suite, and take out the evaluation board. Step 3. Select the GNSS antenna with the appropriate gain (the system frequency supported by the antenna should be consistent with the module) , fix it in the non-occluded area, and use the appropriate cable to connect the antenna and the UM220-IV L EB (evaluation board); Step 4. Connect the PC to the EVK serial port using a straight-through cable. Step 5. Power on the evaluation board and initialize UM220-IV L. Step 6. Open the uSTAR_L software. Step 7. Configure the receiver through uSTAR to display constellations view, messages, and receiver status, etc. UC-00-M15 EN R1.3 Installation 8 3 Technical Specifications 3.1 Electrical Specifications Table 3- 1 Absolute Maximum Ratings Parameter Symbol Min Power Supply Voltage VCC -0.5 VCC Maximum Ripple Backup Power Supply Voltage Antenna Bias Voltage Vrpp 0 V_BCKP -0.5 V_ANT VCC_RF Voltage VCC_RF Input Pin Voltage Vin -0.5 Storage Temperature Tstg -40 Maximum ESD Stress VESD (HBM) Max 3.6 50 3.6 6 3.6 VCC+0.2 85 500 Units V mV V V V V V Condition 3.2 Operating Conditions Table 3- 2 Operating Conditions Parameter Symbol Min Power Supply Voltage VCC 3.0 Typical Value 3.3 Peak Current Backup Power Supply Voltage Antenna Bias Voltage Iccp V_BCKP 1.65 V_ANT 2.8 VCC_RF Voltage VCC_RF VCC-0.1 Low Level Input Voltage Vin_low High Level Input Voltage Vin_high 0.7*VCC Low Level Output Voltage Vout_low High Level Output Voltage Vout_high VCC0.4 Antenna Gain Gant 5 Noise Figure Nftot 4 Operating Temperature Topr -40 Max Units Condition 3.6 V 100 mA VCC=3.0V 3.6 V 5.5 V V 0.2*VCC V V 0.4 V Iout=8mA V Iout=8mA 35 dB dB 85 UC-00-M15 EN R1.3 Technical Specifications 9 UM220-IV L User Manual 3.3 Mechanical Specifications Table 3- 3 Dimensions Parameter Min (mm) A 22.1 B 16.9 C 2.1 D 2.45 E 1.0 F 3.7 G 2.75 H K 0.7 M 0.9 N 0.4 Typical Value (mm) Max (mm) 22.4 23.0 17.0 17.1 2.4 2.7 2.55 2.85 1.1 1.2 3.8 3.9 2.85 3.15 0.82 0.8 0.9 1.0 1.1 0.5 0.6 UC-00-M15 EN R1.3 Technical Specifications 10 Figure 3- 1 Mechanical Layout 3.4 Pin Definition Figure 3- 2 UM220-IV L Pin Assignment UC-00-M15 EN R1.3 Technical Specifications 11 UM220-IV L User Manual Table 3- 4 Pin Definition No Name I/O 1 TXD2 O 2 RXD2 I 3 TXD1 O 4 RXD1 I 5 NC 6 VCC I 7 GND 8 VCC_OUT O 9 NC 10 nRESET I 11 V_BCKP I 12 NC 13 GND -- 14 GND -- 15 GND -- 16 RF_IN I 17 GND -- 18 VCC_RF O 19 V_ANT I Electrical Level LVTTL LVTTL LVTTL LVTTL Description COM2 is for data transmission. Firmware upgrade is not supported. Leave this pin floating if idle. COM2 is for data transmission. Firmware upgrade is not supported. Leave this pin floating if idle. COM1 is for data transmission. Firmware upgrade is supported. COM1 is for data transmission. Firmware upgrade is supported. 3.0V~3.6V 3.0V~3.6V Power supply Ground Power supply output, leave this pin floating if idle LVTTL 1.65V~3.6V External Reset Pin, low active When the main power supply VCC of the module is cut off, V_BCKP supplies power to RTC and SRAM; Current value is about 50A. V_BCKP is necessary for hot start. If you do not use the hot start function, connect V_BCKP to VCC. Do NOT leave it floating or connect it to ground. 3.0V~3.6V Ground Ground Ground GNSS signal input Ground RF power supply output, leave this pin floating if idle Antenna bias voltage, ground this pin if idle UC-00-M15 EN R1.3 Technical Specifications 12 No Name I/O 20 ANT_DET_N I 21 NC 22 NC 23 NC 24 NC 25 NC 26 NC 27 NC TIME 28 O PULSE Electrical Level LVTTL Description Open circuit detection of the active antenna LVTTL 1PPS, leave this pin floating if idle UC-00-M15 EN R1.3 Technical Specifications 13 3.5 PCB Packaging UM220-IV L User Manual Figure 3- 3 UM220-IV L Recommended PCB Packagingunit: mm, in brackets: mil When designing PCB solder mask, make sure that the area under UM220-IV l module is completely coated with solder mask. UC-00-M15 EN R1.3 Technical Specifications 14 4 Hardware Design 4.1 Power Supply VCC VCC is the main power supply of UM220-IV L module, which requires a good monotonic function when powering up, while undershoot and ringing should be guaranteed within 5% VCC. For the VCC to be powered back on after a power failure, the power failure time must exceed 10ms. If the VCC power supply does not meet the requirements described above, there is a certain probability that the module will not start properly 4.2 Antenna Design 4.2.1 Passive Antenna The RF input port of the module can be connected directly to the RF_IN without providing a DC voltage. There are a few things to note when using a passive antenna: Select a proper installation position of the antenna to reduce the interference of electromagnetic noise, so as to enable the optimum performance of the antenna; A 50 impedance match of RF link is needed; Antenna GND RF_IN UM220-IV L UC6226 SAW LNA V_ANT ANT_DET_N VCC_RF FB VCC Figure 4- 1 UM220-IV L Passive Antenna Solution To improve the performance of RF analog front-end, a low noise amplifier (LNA) can be added behind the passive antenna. UM220-IV L module provides a 3.3V power supply (VCC_RF) for LNA. Note: If the user has a high requirement for ESD (higher than the maximum specification UC-00-M15 EN R1.3 Hardware Design 15 UM220-IV L User Manual in User Manual), the user should consider other method to power the LNA rather than using the VCC_RF pin. In this case, it is recommended to choose a power supply chip with high ESD protection level. Gas discharge tube, varistor, TVS tube and other high-power protective devices may also be used in the power supply circuit to further protect the module from ESD damage or other Electrical Over-Stress (EOS). Antenna LNA GND RF_IN UM220-IV L UC6226 SAW LNA V_ANT ANT_DET_N VCC_RF FB VCC Figure 4- 2 UM220-IV L Passive Antenna High-performance Solution 4.2.2 Active Antenna The active antenna increases the system power consumption when improving the system performance. The 3.3V Power Supply (VCC_RF) provided by the UM220-IV l module can be used to power the antenna directly if the function of detecting the state of the antenna inside the module is not used and the working voltage of the antenna is 3.3V. UC-00-M15 EN R1.3 Hardware Design 16 Active Antenna Coaxial Aerial Cable GND DC-Block RF_IN 100pF L V_ANT 68nH ANT_DET_N 10nF R1 10 VCC_RF UM220-IV L UC6226 SAW LNA FB VCC Figure 4- 3 UM220-IV L Active Antenna Solution Powered by VCC_RF Note: If the user has a high requirement for ESD (higher than the maximum specification in User Manual), the user should consider other method to feed the antenna rather than using the VCC_RF pin. In this case, it is recommended to choose a power supply chip with high ESD protection level. Gas discharge tube, varistor, TVS tube and other highpower protective devices may also be used in the power supply circuit to further protect the module from ESD damage or other Electrical Over-Stress (EOS). When the working voltage of the active antenna is not 3.3V, the antenna can be powered by the external power supply. Active Antenna Coaxial Aerial Cable GND DC-Block RF_IN 100pF L V_ANT 68nH ANT_DET_N R1 10 DC 10nF VCC_RF UM220-IV L UC6226 SAW LNA FB VCC Figure 4- 4 UM220-IV L Active Antenna Solution Powered by External Power Supply UC-00-M15 EN R1.3 Hardware Design 17 UM220-IV L User Manual 4.2.3 Active Antenna State Detection UM220-IV L module can detect the active antenna state including open-circuit, shortcircuit and normal state. The host computer enables or disables the antenna state detection function by transmitting commands via serial ports, and receives the detected antenna state via serial ports. The module cuts off the power supply automatically when detecting the short-circuit state of antenna. 1) Antenna Short-circuit Detection If the antenna short-circuit detection function is required, connect the antenna power supply to the module's V_ANT Pin after cascading an appropriate value of resistance, and feed the antenna through the internal switch. If the V_ANT pin is directly connected without a serial resistor, the module will be damaged when the antenna is shortcircuited. The internal switch is turned off by default, which can be switched with the CFGANT command. When the module detects an antenna short-circuit, the antenna feed is cut off immediately through the internal switch, periodically feeds the antenna and detects the state. Use ANTSTAT for the query. If the working voltage of the antenna is 3.3V, the 3.3V power supply (VCC_RF) provided by the module can be connected in series with a 10 resistor to the V_ANT pin, and turn on the internal switch through CFGANT to power the antenna. If an antenna short circuit is detected at this time, the module will automatically turn off the switch. When there is a need to save the power consumption, turn off the switch through CFGANT. Refer to UM220-IV L_ Protocol Specification for more details UC-00-M15 EN R1.3 Hardware Design 18 Active Antenna Coaxial Aerial Cable GND RF_IN UM220-IV L UC6226 SAW LNA R1 10 10nF V_ANT ANT_DET_N VCC_RF FB VCC Figure 4- 5 UM220-IV L Antenna Short-circuit Detection Powered by VCC_RF When the working voltage of the antenna is 5V, the antenna can be powered by connecting an external power supply with a 10 serial resistor to the V_ANT pin. Since this power supply is directly connected to the RF_IN pin of the module, this power supply cannot introduce noise. It's recommended to use the power supply from analog network. Active Antenna Coaxial Aerial Cable GND RF_IN UM220-IV L UC6226 SAW LNA V_ANT R1 10 10nF ANT_DET_N DC VCC_RF FB VCC Figure 4- 6 UM220-IV L Antenna Short-circuit Detection Powered by External Power Supply 2) Antenna Shot-circuit and Open-circuit Detection If the short-circuit and open-circuit detection functions of the module are required concurrently, use the ANT_DET_N pin to cooperate with an external circuit. The UC-00-M15 EN R1.3 Hardware Design 19 UM220-IV L User Manual threshold current for open circuit detection can be calculated by formula (4-1). When the antenna working current is less than the calculated value, the module determines that the antenna is open-circuit. The resistance of the series resistor R1 can be adjusted according to the antenna working current. Active Antenna Coaxial Aerial Cable GND RF_IN UM220-IV L UC6226 SAW LNA 100nF R2 560 R3 100K R1 10 V_ANT ANT_DET_N VCC_RF - OP + LT6000 FB VCC Figure 4- 7 UM220-IV L Antenna Short-circuit and Open-circuit Detection Powered by VCC_RF I = (2+23) 1 _ 4-1 If an external power supply is used to power the antenna, the maximum power supply voltage cannot exceed 5.5V to protect the ANT_DET_N pin, Use ANTSTAT to query the antenna state. 4.3 UART The two serial ports of UM220-IV L are LVTTL levels, which need to be converted through RS232 level if connected to PC. UC-00-M15 EN R1.3 Hardware Design 20 UART1 RS232 1 UM220-IV L RS232 Converter PC UART2 RS232 2 Figure 4- 8 Connect to PC through UART It is recommended that users reserve a test point for serial port 2 as the debug port. If there is data input on the module input ports (RXD, GPIO) when the module is not powered on, it will form a string of electricity voltage on the module VCC. When the string voltage is higher than 1.6V, it may cause a start failure when the module is powered on. To prevent the string power, ensure that the IO port connected to the module is in high impedance or low level when the module is not powered on. 4.4 RESET Time Sequence There is a reset chip inside the module. When VCC is lower than 2.63V (typical value of ambient temperature) or nRESET is at low level, the module is in reset state. After VCC rises to 2.63V or nRESET changes from low to high, the reset state of the chip will continue to remain for 200ms. It is recommended to keep the reset signal of the nRESET pin for 10ms after VCC is valid at power-up. During normal operation, the minimum valid time of the reset signal for the nRESET pin is 500ns. 4.5 TIME PULSE Output The period of the TIME PULSE output signal is 1s, the peak-to-peak value is VCC, and the default duty cycle is 10%. UC-00-M15 EN R1.3 Hardware Design 21 UM220-IV L User Manual 4.6 Layout Recommendation Power supply: Stable and low ripple power is necessary for good performance. Make sure the peak-to-peak voltage ripple does not exceed 50mV. - Use LDO to ensure the purity of power supply; - Place LDO to the module as close as possible in layout; - Widen the power circuit wiring or use split copper surface to transmit current; - Avoid the highpower or high inductance devices such as magnetic coil. Antenna interface: note with the antenna impedance matching, and the circuit is short and smooth, try to avoid acute angles. Connect the RF signal to the antenna and make sure the 50 impedance match on the circuit. Antenna location: to obtain a good signal-to-noise ratio, ensure that the antenna is well isolated from electromagnetic radiation sources, especially electromagnetic radiation in the frequency range of 1559 to 1605 MHz. Try to avoid circuits below the UM220-IV L module. UM220-IV L module is a temperature sensitive device, rapid temperature changes will result in reduced performance. Keep it as far away from the highpower high-temperature air and heating devices as possible. UC-00-M15 EN R1.3 Hardware Design 22 5 Packaging 5.1 Product Labeling Product Model Serial Number Figure 5- 1 Product Label Part Number Product QR Code 5.2 Packaging Description UM220-IV L modules use carrier tape and reel (suitable for mainstream surface mount equipment), packaged in vacuum-sealed aluminum foil antistatic bags, with a desiccant inside to prevent moisture. When using reflow welding process to weld modules, please strictly comply with IPC standard to conduct humidity control on modules. As packaging materials such as carrier belt can only withstand the temperature of 65 degrees Celsius, modules shall be removed from the packaging during baking. Figure 5- 2 UM220-IV L Package Diagram UC-00-M15 EN R1.3 Packaging 23 Table 5- 1 Package Instructions Item Description Module Reel size Carrier tape 500 pics/reel tray13" external diameter: 330mm, internal diameter: 100mm, width: 24mm thickness: 2.0mm Space between: 20mm UM220-IV L User Manual UM220-IV L module is rated at MSL level 3, refer to the relevant IPC/JEDEC standards for baking requirements. Please access to the website www.jedec.org to download for details. The shelf life of UM220-IV L module is one year. UC-00-M15 EN R1.3 Packaging 24 6 Soldering and Disassembly 6.1 Disassembly When it is necessary to remove the module, it is recommended to melt the soldering tin of the pins on both sides of the module with an electric soldering iron and remove the module with tweezers. Do NOT use other means to remove the module (for example, the module is blown off by a hot air gun), which may lead to module damage. 6.2 Clean Do NOT use alcohol or other organic solvents to clean, it may lead to flux residues into the shielding shell, causing mildew and other problems 6.3 Reflow Soldering In order to avoid component falling off, the module should be placed on the upper part of the motherboard when soldering. The reflow temperature curve is recommended as shown in figure 6-1 below (M705-GRN360 is recommended for solder paste). Note: The module can only be soldered once. Figure 6- 1 Reflow Soldering Curve UC-00-M15 EN R1.3 Soldering and Disassembly 25 Unicore Communications, Inc. 7 F3, No.7, Fengxian East Road, Haidian, Beijing, P.R.China, 100094 www.unicorecomm.com Phone: 86-10-69939800 Fax: 86-10-69939888 info@unicorecomm.com