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Summary of Contents for unicore UM681 Series
- Page 1 HARDWARE REFERENCE DESIGN WWW.UNICORE.COM UM681 Series Multi-System Dual-Frequency High Precision RTK Integrated Positioning Module Copyright© 2009-2024, Unicore Communications, Inc. Data subject to change without notice.
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Page 2: Revision History
This manual does not represent, and in any case, shall not be construed as a commitments or warranty on the part of Unicore with respect to the fitness for a particular purpose/use, the accuracy, reliability and correctness of the information contained herein. - Page 3 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.
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Page 4: Target Readers
UM681 Series Hardware Reference Design Foreword This document provides the hardware reference design of Unicore UM681 series modules. UM681 series modules consist of the following models: Product Main model Sub-model UM681A (automotive) UM681A-12 UM681 series UM681 (industrial) UM681-12 Target Readers... -
Page 5: Table Of Contents
Contents Block Diagram ................... 1 UM681 Peripheral Design ................2 Main Power VCC ......................4 Backup Power V_BCKP ....................4 Active Antenna Feed Circuit .................... 5 Reset Circuit ........................5 Odometer Interfaces .................. 6 Hardware Interface ......................6 3.1.1 Odometer Reference Circuit and Waveform Diagram ..........7 3.1.2 Odometer Speed and Direction Signals .............. -
Page 6: Block Diagram
UM681 Series Hardware Reference Design 1 Block Diagram UFirebird II UM681 UART1/2 EVENT Interface Filter ANT_IN RESET_N GNSS GNSS RTK_STAT D_SEL CLOCK TCXO MEMS (Gyro, Acc) Figure 1-1 UM681 Block Diagram C, SPI, EVENT and RTK_STAT are reserved interfaces, not supported currently. SPIS and I C/UART1 share the same pins. -
Page 7: Um681 Peripheral Design
2 UM681 Peripheral Design Connect the ANT_IN signal to the antenna, and note the 50 Ω impedance matching. Connect all the GND pins to the ground. Leave the IO pins open if not used. Recommended to add TVS anti-surge protection at the power input of the module. ... - Page 8 UM681 Series Hardware Reference Design UM681 RF Line R0805 UM681 Module Note: PINs leave OPEN if not used Figure 2-1 UM681 Peripheral Design UC-08-M101 EN R1.0 UM681 Peripheral Design...
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Page 9: Main Power Vcc
The GND pads at the bottom of the module should be grounded to ensure heat dissipation. Figure 2-2 UM681 GND Pads Main Power VCC The working voltage range of VCC is 2.7 V to 3.6 V. Note: The VCC initial level when power-on should be less than 0.4 V. The VCC ramp when power-on should be monotonic, without plateaus. -
Page 10: Active Antenna Feed Circuit
UM681 Series Hardware Reference Design Power-on time interval: The time interval between the power-off (V_BCKP < 0.4 V) to the next power-on must be larger than 500 ms. When the hot start function is not used, connect V_BCKP to VCC or a backup power source. -
Page 11: Odometer Interfaces
3 Odometer Interfaces Odometer data can be input to the UM681 module via hardware interface or software interface. The two ways cannot be used at the same time. Hardware Interface The pin 22 (WT) of the UM681 module is used to receive the speed pulse signal (WHEELTICK) from the odometer, and the pin 23 (DIR) is used to receive the direction signal (FWD) from the odometer. -
Page 12: Odometer Reference Circuit And Waveform Diagram
UM681 Series Hardware Reference Design 3.1.1 Odometer Reference Circuit and Waveform Diagram VCCIN VCCIN 1. VCCIN:2.7V~3.6V 2. WT/DIR: High: 0.7*VCC ~ 3.6V VCCIN Low: -0.3V~0.2*VCC VCCIN Figure 3-2 Reference Circuit for Odometer Figure 3-3 Odometer Waveform Diagram UC-08-M101 EN R1.0... -
Page 13: Odometer Speed And Direction Signals
3.1.2 Odometer Speed and Direction Signals 3.1.2.1 Voltage Requirements The voltage requirements of VCC, V_BCKP, WT and DIR are shown in the table below. Table 3-1 Voltage Requirements Item Symbol Min. Typ. Max. Unit Main Supply Backup Supply V_BCKP Ripple Voltage WT/DIR Low Level Input Voltage -0.3 0.2*VCC... -
Page 14: Software Interface
UM681 Series Hardware Reference Design Software Interface Speed and direction information can be input to the UM681 module via UART1 or UART2, which can be configured by the following command. Syntax: $ODODATA,time,speed,forward,RSV,RSV,RSV Example: $ODODATA,091649.00,10000,1,,, Table 3-2 Parameter Description of ODODATA... - Page 15 ANT BIAS UM681 RF Line UM681 R0805 UM681 Module Note: PINs leave OPEN if not used Appendix: Schematics of Reference Design UC-08-M101 EN R1.0...
- Page 16 UM681 Series Hardware Reference Design VCCIN VCCIN 1. VCCIN:2.7V~3.6V 2. WT/DIR: High: 0.7*VCC ~ 3.6V VCCIN Low: -0.3V~0.2*VCC VCCIN UC-08-M101 EN R1.0 Appendix: Schematics of Reference Design...
- Page 17 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.unicore.com Phone: 86-10-69939800 Fax: 86-10-69939888 info@unicorecomm.com www.unicore.com...
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