unicore UT986eb User Manual Download Page 11 | Manualshive

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unicore UT986eb User Manual Download Page 11

6

Power Supply

UC-08-M37 EN R1.0

3

Power Supply

The power supply of the evaluation board 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.

The input range of VIN is 3.2V to 5V.

FC1

NFM21PC104R1E3D

Figure 3-1 Power Filter Circuit

Figure 3-2 3.3 V LDO and 5 V DC/DC on the Bottom of EB

3.3V LDO

稳压

5V DCDC

升压

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Summary of Contents for UT986eb

Page 1: ...WWW UNICORECOMM COM Copyright 2009 2023 Unicore Communications Inc Data subject to change without notice UT986eb Evaluation Board HARDWARE USER MANUAL...

Page 2: ...UT986eb User Manual i Revision History Version Revision History Date R1 0 First release Nov 2023...

Page 3: ...mplied by estoppel or any other form the granting or transferring of Unicore rights and or interests including but not limited to the aforementioned trademark rights in whole or in part Disclaimer The...

Page 4: ...l iii Foreword This manual provides information on the hardware composition and design of the UT986 evaluation board UT986eb Target Readers This document is written for technicians who are familiar wi...

Page 5: ...6 3 1 3 3 V LDO Power Supply 7 3 2 5 V DC DC Power Supply 8 3 3 Backup Power Supply 9 4 Antenna Circuit 11 4 1 Antenna Short Protection Circuit 11 4 2 Antenna Feed Circuit 12 5 LED Indicators 13 6 UT9...

Page 6: ...opout regulator LDO a 5V DC DC boost circuit an antenna short protection circuit and peripheral interfaces The schematics of the evaluation board can be used as the reference design for the module UT9...

Page 7: ...6 socket The printing adopts exposed copper to ensure the flatness of the surface 2 UT986 module The pin pads are designed long which is convenient for soldering testing and debugging For detailed pac...

Page 8: ...ottom View of UT986eb 1 Ports used to connect jumpers 2 Anti static design and heat dissipation with exposed copper 3 Debug ports 4 VCC power supply and LDO circuit 5 Dual row pins as external interfa...

Page 9: ...scription No Pin Name I O Description 1 NC No connection inside 2 NC No connection inside 3 NC No connection inside 4 NC No connection inside 5 LNA_PWR I Antenna feed voltage for LNA 6 VIN I Main powe...

Page 10: ...LVTTL 20 GND Ground 21 NC No connection inside 22 GND Ground 23 PPS O PPS output 24 NC No connection inside 25 NC No connection inside 26 NC No connection inside 27 NC No connection inside 28 NC No c...

Page 11: ...IN 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 The input range of VIN is 3 2V to 5V FC1 NFM21PC104R...

Page 12: ...ent of LDO should be more than twice the current of the module R16 is a series resistor placed at the input of the LDO which is used for debugging When selecting the resistor choose one with high rate...

Page 13: ...nd R28 are series resistors connected to the DC DC circuit at the input and output which are used for debugging When selecting the resistors choose those with suitable rated power according to the pow...

Page 14: ...tery supplies power to V_BCKP the battery charging circuit should be designed to prevent reverse current to ensure that the battery only supplies power to V_BCKP and the current does not flow back int...

Page 15: ...ble before testing the hot start function 1 Use a multimeter to measure the voltage of the micro battery If the voltage is above 2 6 V and is stable it indicates that the power of the micro battery is...

Page 16: ...ds the antenna via the chip When the antenna current is larger than 100 mA the circuit triggers a short protection and FLAGB gives a low level indication After removing R44 and R45 the antenna short p...

Page 17: ...Removing R45 and soldering R46 the antenna short protection circuit is bypassed Then you can use the 5 V DC DC circuit output directly to feed the antenna The ESD protection diode should support high...

Page 18: ...1 Description of the LED Status LED Indicator Color Description Power 5V or 3 3V Green Light on when the power is normal Reset Red Light on when pressing the reset button Antenna Red Light on when an...

Page 19: ...a total capacitance greater than 30 F Add series resistors at the IO pins for the convenience of debugging VCCIN powers the module only R18 is a large size resistor with high rated power to ensure th...

Page 20: ...UT986eb User Manual UC 08 M37 EN R1 0 UT986 Series Peripheral Design 15 0805 U1A UT986 Figure 6 1 UT986 Peripheral Design...

Page 21: ...gure 6 2 UT986 Peripheral Circuit The GND pads at the bottom of the module should be grounded to ensure heat dissipation The evaluation board has copper exposed on the bottom of the module which not o...

Page 22: ...or internal debugging J1 is used for MMCX connection After soldering the MMCX connector it can be used to measure the PPS signals J2 J3 J6 and J7 are debug ports Connect the signal that needs to be te...

Page 23: ...18 Appendix UC 08 M37 EN R1 0 The silkscreen markings of the test points are arranged in order to identify the function of each port Figure 7 2 Through Hole Test Points Appendix UT986eb schematics...

Page 24: ...eration range 3 2V 5V DC DC 5V Vout 1 225 1 16 5 1 5 07V Hole Title Size Document Number Rev Date Sheet of UT986eb Title Size Document Number Rev Date Sheet of UT986eb Title Size Document Number Rev D...

Page 25: ...D C C B B A A UT986 Module Title Size Document Number Rev Date Sheet of UT986eb Title Size Document Number Rev Date Sheet of UT986eb Title Size Document Number Rev Date Sheet of UT986eb Ant J5 Ant Bia...

Page 26: ...UT986eb User Manual UC 08 M37 EN R1 0 Appendix 21 Assembly Top of UT986...

Page 27: ...22 Appendix UC 08 M37 EN R1 0 Assembly Bottom of UT986...

Page 28: ...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 www unicorecomm com...

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