Related Manuals for unicore UM982eb
Summary of Contents for unicore UM982eb
- Page 1 HARDWARE USER MANUAL WWW.UNICORECOMM.COM UM982eb Evaluation Board Copyright© 2009-2023, Unicore Communications, Inc. Data subject to change without notice.
- Page 2 Information, such as product specifications, descriptions, features and user guide in this manual, are subject to change by Unicore at any time without prior notice, which may not be completely consistent with such information of the specific product you...
- Page 3 UM982eb 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 UM982eb (evaluation board). Target Readers This document is written for technicians who are familiar with GNSS modules.
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Page 5: Table Of Contents
UM982eb 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 UM982eb 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 UM982eb can be used as the reference design for the UM982 module. - Page 7 UM982eb User Manual The appearance of UM982eb is shown as follows: Figure 1-2 Top View of UM982eb (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 UM982eb (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
UM982eb User Manual 2 Interfaces The dual-row 28 pins serve as the external interfaces of UM982eb, 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 UM982eb Interfaces... - Page 10 Pin Name Description RSV#12 — Reserved EVENT Event input, with adjustable frequency and polarity RSV#29 — Reserved TXD3 COM3 output, can be used as CAN TXD, LVTTL — Ground TXD1 COM1 output, LVTTL RXD1 COM1 input, LVTTL — Ground TXD2 COM2 output, LVTTL RXD2 COM2 input, LVTTL...
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Page 11: Power Supply
UM982eb User Manual 3 Power Supply The power supply of the UM982eb 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 UM982eb. 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
UM982eb 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. MS621T-FL11E Figure 3-5 Backup Power Circuit Figure 3-6 Backup Power Circuit on the Bottom of UM982eb Note: The power supply for V_BCKP can be provided by the backup battery. The circuit that... -
Page 15: Antenna Circuit
UM982eb User Manual V_BCKP. The backup battery may run out of power if it is not used for a long time, so it is recommended to charge the evaluation board for more than two hours when you first use it. -
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 UM982eb will be bypassed. The ESD protection diode should support high-frequency signal (above 2000 MHz). -
Page 17: Led Indicators
UM982eb User Manual Figure 4-4 Antenna Feed Circuit on the Bottom of UM982eb 5 LED Indicators There are LED indicators on UM982eb to indicate the working status of each functional unit. Figure 5-1 LED Indicators LED Indicators UC-08-M31 EN R1.0... - Page 18 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...
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Page 19: Um982 Peripheral Design
UM982eb User Manual 6 UM982 Peripheral Design TVS anti-surge protection is added at the input of the UM982 module. ESD protection is added at all pins. Use large and small VCC filter capacitors together, with a total capacitance greater than 30 uF. - Page 20 The GND pads at the bottom of the module should be grounded to ensure heat dissipation. The UM982eb 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.
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Page 21: Debug Support
UM982eb User Manual 7 Debug Support As mentioned above, TP1 and TP10 can be used to connect an external power to supply VCCIN and V_BCKP and to measure the supply voltage and current. TP2, TP4, TP6 and TP8 are used for internal debugging, of which TP6 and TP8 can be used to debug I J1 and J2 are used for MMCX connection. -
Page 22: Appendix
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 UM982eb Appendix Schematic of UM982eb UC-08-M31 EN R1.0 Appendix... - Page 23 (SPEED) EVENT RXD1 3.3V TXD3 TXD3 PVT_STAT 19-21SYGC/S530-E2/TR8 RXD1 TXD1 RXD1 TXD1 RTK_STAT 19-21SYGC/S530-E2/TR8 TXD2 TXD2 ERR_STAT 19-21SURC/S530-A2/TR8 RXD2 RXD2 UM982eb-PCB-V1R0 PVT_STAT 3.3V 19-21SYGC/S530-E2/TR8 RSV#31_R PPS1_R RSV#31 (FWR) 19-21SYGC/S530-E2/TR8 ERR_R RTK_R ERR_STAT RTK_STAT TPI+ TPO+ 19-21SURC/S530-A2/TR8 FLAGB1 3.3V SCL1_R SDA1_R...
- Page 24 PIN16 PIN16 100pF 100nF 10uF 10uF 10uF SMF5.0A RTK_STAT RTK_STAT PIN17 PIN17 RXD1 RXD1 PIN18 PIN18 TXD1 TXD1 Unicore Communications,Inc Unicore Communications,Inc Unicore Communications,Inc PIN19 PIN19 PIN22 PIN22 RXD2 RXD2 Title Title Title PIN20 PIN20 PIN21 PIN21 UM982eb UM982eb UM982eb...
- Page 25 Assembly Top of UM982eb...
- Page 26 UM982eb User Manual Assembly Bottom of UM982eb...
- Page 27 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 www.unicorecomm.com...