Related Manuals for UNICORECOMM UM982-EB
Summary of Contents for UNICORECOMM UM982-EB
- Page 1 HARDWARE USER MANUAL WWW.UNICORECOMM.COM UM982-EB Evaluation Board Copyright© 2009-2022, Unicore Communications, Inc. Data subject to change without notice.
- Page 2 Unicore holds the trademarks of “和芯星通”, “UNICORECOMM” and other trade name, trademark, icon, logo, brand name and/or service mark of Unicore products or their product serial referred to in this manual (collectively “Unicore Trademarks”).
- Page 3 UM982-EB User Manual Should you purchase our product and encounter any inconsistency, please contact us or our local authorized distributor for the most up-to-date version of this manual along with any addenda or corrigenda.
- Page 4 Foreword This manual provides information on the hardware composition and design of the UM982 evaluation board (EB). Target Readers This document is written for technicians who are familiar with GNSS modules.
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Page 5: Table Of Contents
UM982-EB User Manual Contents Product Overview ..................1 Interfaces...................... 4 Power Supply ....................6 3.3V LDO Power Supply ....................7 5V DC/DC Power Supply ....................8 Backup Power Supply ...................... 9 Antenna circuit ................... 10 Antenna Short Protection Circuit .................. 10 Antenna Feed Circuit ..................... -
Page 6: Product Overview
1 Product Overview UM982-EB is the evaluation board for UM982 and it consists of the UM982 module, a 3.3 V low dropout regulator (LDO), a 5V DC/DC boost circuit, two antenna short protection circuits and peripheral interfaces. The schematic of the UM982-EB can be used as the reference design for the UM982 module. - Page 7 UM982-EB User Manual The appearance of UM982-EB is shown as follows: Figure 1-2 Top View of UM982-EB (1) Silkscreen: It marks the signals of the pins. The smaller holes around are used to mount the UM982 socket. The printing adopts exposed copper to ensure the flatness of the surface.
- Page 8 Figure 1-3 Bottom View of UM982-EB (1) Antenna short protection circuit (2) Anti-static design and heat dissipation with exposed copper (3) VCC power supply and LDO circuit (4) Backup battery (5) 5 V DC/DC boost circuit for antenna feeding (6) Dual-row pins as external interfaces...
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Page 9: Interfaces
UM982-EB User Manual 2 Interfaces The dual-row 28 pins serve as the external interfaces of UM982-EB, and the pin pitch is 2 mm. The interfaces can be directly connected to the J18 on Unicore HPL EVK-V5.0 board. CH71283V100 Figure 2-1 UM982-EB Interfaces... - Page 10 Pin Name Description System reset, active low, and the active time RESET_N should be no less than 5 ms. RSV#12 — Reserved Event mark input, with adjustable frequency EVENT and polarity RSV#29 — Reserved TXD3 COM3 output, can be used as CAN TXD, LVTTL —...
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Page 11: Power Supply
The availability of the ports depends on the firmware version of the UM982 module. 3 Power Supply The power supply of the UM982-EB is input from the VIN pin, passing through a circuit with surge protection and filter capacitors, to provide power for the 3.3 V LDO circuit and 5 V DC/DC boost circuit. -
Page 12: Ldo Power Supply
3.1 3.3V LDO Power Supply VCC outputs 3.3 V voltage after passing through the LDO circuit to provide power to UM982-EB. 0805 TPS7A8101DRB 0805 Vout=0.8*(1+16/5.1)=3.31V Dropout Voltage: 170mV@1A Figure 3-3 3.3V LDO Circuit Notes: The rated output current of LDO should be more than twice the maximum operating current of UM982. -
Page 13: Dc/Dc Power Supply
UM982-EB User Manual 3.2 5V DC/DC Power Supply VCC outputs 5 V voltage after passing through the DC/DC boost circuit to feed the antenna. LT3467AIDDB Vout=1.225*(1+16/5.1)=5.07V Figure 3-4 5V DC/DC Boost Circuit Note: You can choose whether to use the 5 V power on the board to feed the antenna according to the antenna type. -
Page 14: Backup Power Supply
The input range of V_BCKP is 2.0 V to 3.6 V. Figure 3-5 Backup Power Circuit Figure 3-6 Backup Power Circuit on the Bottom of UM982-EB Note: The power supply for V_BCKP can be provided by the backup battery. The circuit that... -
Page 15: Antenna Circuit
UM982-EB User Manual V_BCKP. 4 Antenna circuit 4.1 Antenna Short Protection Circuit The antenna short protection circuit consists of a load management chip and peripheral circuits. The 5 V power source supplies the antenna after passing through the load management chip. -
Page 16: Antenna Feed Circuit
ESD protection. Removing R77 and R6 and soldering R79 and R8, you can directly use the 5 V power to supply the antenna. In this condition, the antenna short protection circuit on UM982-EB will be bypassed. The ESD protection diode should support high-frequency signal (above 2000 MHz). -
Page 17: Led Indicators
UM982-EB User Manual Figure 4-4 Antenna Feed Circuit on the Bottom of UM982-EB 5 LED Indicators There are LED indicators on UM982-EB to indicate the working status of each functional unit. Figure 5-1 LED Indicators LED Indicators UC-08-M31 EN P1.0.3... -
Page 18: Um982 Peripheral Design
Table 5-1 Description of the LED Status LED Indicator Color Description Power (5V or 3.3V) Green Light on when the power is normal Reset Light on when pressing the reset button Antenna Light on when antenna is shorted Green Light on when position is fixed Green Light on when RTK is fixed Light on when failing self-test... - Page 19 UM982-EB User Manual VCCIN powers the UM982 module only. R27 is a large-size resistor (with high rated power) to ensure the current capability. In the figure below, a 0805 resistor is used. Removing R27, connecting a power supply wire at TP1 and a ground wire at TP3 (as shown in Figure 7-1), you can use an external power to supply the module.
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Page 20: Debug Support
The UM982-EB has copper exposed on the bottom of the UM982 module, which not only enhances heat dissipation, but also provides a large area for grounding and is convenient to test. UM982 Figure 6-3 UM982 Pads (Y1-Y39) and Socket Mounting Holes (X1-X8) -
Page 21: Appendix
Figure 7-1 Debug Ports for the UM982 Module The silkscreen markings on the right of the test points are arranged in order to identify the function of each port. Figure 7-2 Through-Hole Test Points on UM982-EB Appendix Schematic of UM982-EB Appendix UC-08-M31 EN P1.0.3... - Page 22 19-21SURC/S530-A2/TR8 FLAGB2 3.3V 19-21SURC/S530-A2/TR8 RSTN 3.3V CH71283V100 19-21SYGC/S530-E2/TR8 SPIS_CSN SPIS_MOSI SPI_CS SPI_MOSI TXD3 3.3V 19-21SYGC/S530-E2/TR8 SPIS_SDRY SPIS_CLK RXD3 3.3V TPO_MID SPI_CLK 19-21SYGC/S530-E2/TR8 (LNA_PWR) LNA_PWR TXD2 3.3V 19-21SYGC/S530-E2/TR8 RXD3 SPIS_MISO RXD3 SPI_MISO RXD2 3.3V 19-21SYGC/S530-E2/TR8 RSV#12 RSTN TXD1 3.3V FRESET_N RESETIN_N 19-21SYGC/S530-E2/TR8 RSV#29 EVENT...
- Page 23 5.1k 3.3V BIF#25 ANT1_IN1 5.1k ANT1_IN 3.3V BIF#26 100pF FPF2004 22uH 68nH ANT1_BIAS ANT1_BIAS1 ANT1_BIAS2 BIF#25 VOUT MBR120LSFT1G Debug1 BIF#26 10uF 100nF 100nF VCCIN SMF5.0A 100nF 100pF 5.1k 5.1k PESD5V0F1BL,315 3.3V 3.3V FLAGB 5.1k FLAGB1 3.3V 5.1k 3.3V Ant1 Bias Ant1 3.3V ANT2_IN1...
- Page 24 Assembly Top of UM982-EB...
- Page 25 Assembly Bottom of UM982-EB...
- Page 26 和芯星通科技（北京）有限公司 Unicore Communications, Inc. 北京市海淀区丰贤东路 7 号北斗星通大厦三层 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...
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