ST ST25RU3993-EVAL User Manual
  1. Manuals
  2. Brands
  3. ST Manuals
  4. Motherboard
  5. ST25RU3993-EVAL
  6. User manual
ST ST25RU3993-EVAL User Manual

ST ST25RU3993-EVAL User Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
UM2353
User manual
ST25RU3993-EVAL board
Introduction
®
The ST25RU3993-EVAL board is a RAIN
(UHF) RFID reader system based on the integrated reader ST25RU3993 device.
®
The purpose of the ST25RU3993-EVAL board is to provide a comprehensive RAIN
RFID reader system, which allows user to
evaluate the properties and features of the ST25RU3993. The ST25RU3993 is a versatile RAIN reader device, which can be
deployed in mobile, hand-held and stationary reader applications alike. The architecture of the ST25RU3993-EVAL board
combines a long range and a short range reader design. Furthermore the ST25RU3993-EVAL board has been fitted with
numerous easy to access test points and measurement possibilities.
The ST25RU3993-EVAL board is controlled via a graphical user interface (GUI) software running on a host PC through an USB/
UART bridge (requires COM port driver installation). The GUI can be downloaded from www.st.com.
The ST25RU3993-EVAL is powered through an USB 3.0 port in order to provide sufficient power for the long range
configuration of the reader. If an USB 3.0 port is not available an USB 2.0 Y-cable or an external power supply can be used to
enable the long range capabilities of the reader. If neither is available only the short range reader configuration with lower RF
power is available.
The ST25RU3993-EVAL offers two SMB (female) antenna ports, which can be configured via the GUI as active RF output. To
®
enable scanning for RAIN
RFID transponders connect a suitable 50 Ω UHF antenna for the targeted frequency and RF power
range. The ST25RU3993-EVAL board supports 52 frequency channels ranging from 840 MHz to 960 MHz. In the reader
settings the appropriate frequency profile has to be selected.
Figure 1.
ST25RU3993-EVAL board (top view)
UM2353 - Rev 2 - November 2018
www.st.com
For further information contact your local STMicroelectronics sales office.

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the ST25RU3993-EVAL and is the answer not in the manual?

Questions and answers

Related Manuals for ST ST25RU3993-EVAL

Summary of Contents for ST ST25RU3993-EVAL

  • Page 1 The ST25RU3993-EVAL board is controlled via a graphical user interface (GUI) software running on a host PC through an USB/ UART bridge (requires COM port driver installation). The GUI can be downloaded from www.st.com.

  • Page 2: General Information

    UM2353 General information General information ® The ST25RU3993-EVAL supports Arm -based devices. Note: Arm is a registered trademark of Arm Limited (or its subsidiaries) in the US and/or elsewhere. UM2353 - Rev 2 page 2/48...

  • Page 3: Standard Connection Setup

    UM2353 Standard connection setup Standard connection setup The typical reader setup is shown in Figure 2. The host PC running the GUI is connected to the ST25RU3993- EVAL board via a micro USB cable. The antenna is connected to the active antenna port using a 50 Ω coax cable. An UHF transponder is within range of the antenna reader.

  • Page 4: St25Ru3993 Block Diagram

    UM2353 ST25RU3993 block diagram ST25RU3993 block diagram Figure 3. Functional block diagram 3.3 V Crystal: LDO: LDO: LDO: TCXO: (optional) LD39100PUR LD39100PUR LD39100PUR TXETDCSANF-20 NX32255A-20 3.3 V OSCO PA_LDO_EN USB/UART 3.6 V USB Connector: Bridge: MICRO-B FT231XQ-R SPI (Mode1) MIX_INP MCU: UHF RFID Reader IC: MIX_INN...

  • Page 5: St25Ru3993-Eval Board Features

    UM2353 ST25RU3993-EVAL board features ST25RU3993-EVAL board features ® • ST25RU3993 RAIN (UHF) RFID reader IC • Two power amplifier (internal/external) options - software-controlled • External PA: 29 dBm max TX power • Internal PA: 18 dBm max TX power •...
  • Page 6 UM2353 ST25RU3993-EVAL board features – Main supply • Buttons: – MCU Reset – MCU Boot Mode – BT module reset button (not installed) • Buzzer • Wireless Interface (not installed): – BT 4.0 - SPP Profile – JTAG interface: for BT module programming –...

  • Page 7: Hardware Description

    Depending on which differential output port pair is activated the modulated carrier frequency will be amplified accordingly. The 0-dBm output is used for the long-range configuration of the ST25RU3993-EVAL reader. The 0-dBm output with its differential output pin pairs RFONX (23) and RFOPX (24) is connected to a 2:1 Balun at which point the transmit signal is transformed from a 100 differential to a 50 Ω...

  • Page 8: Pa12

    The output of the external power amplifier and the output of the internal power amplifier are connected to an RF- switch, which can be controlled via the GUI of the ST25RU3993-EVAL reader. Only one power amplifier option can be active at a time.

  • Page 9: Microcontroller And Connections

    UM2353 Microcontroller and connections the leakage across the main directional coupler. To minimize the self-jamming signal a carrier cancellation circuit is connected to the coupled port of the main directional coupler. The carrier cancellation circuit is able to change its impedance and thereby is able to reflect a certain amount of the coupled power back into the directional coupler again.
  • Page 10 UM2353 Microcontroller and connections Figure 7. Main digital interfaces The ST25RU3993-EVAL is controlled by STM32L476RGT6 (U1), which is an ultra-low-power microcontroller with ® ® FPU Arm 32-bit Cortex -M4 MCU 80 MHz with 1 Mbyte Flash, LCD, USB OTG, DFSDM.

  • Page 11: Table 3. Mcu - Spi Interface And St25Ru3993 Connections

    UM2353 Microcontroller and connections STM32L476RGT6 is supplied by 3.3 volts, which is regulated by an LDO (U9). The clock source for STM32L476RGT6 is an external crystal (X1) generating 32.768 kHz and is connected to OSC32_in (3) and OSC32_out (4). The STM32L476RGT6 microcontroller communicates with the host PC via UART for which an USB/UART bridge is used.

  • Page 12: Table 4. Spi Interface Pinout At J10, J12 And J13

    UM2353 Microcontroller and connections Table 4. SPI interface pinout at J10, J12 and J13 Component: U5 Component: U6 Component: U7 Component: U8 J10 J12 J13 ST25RU3993 pin ST25RU3993 pin DTC1 pin DTC1 pin DTC2 pin DTC2 pin DTC3 pin DTC3 pin name number name...

  • Page 13: Table 7. Mcu - Connections To Leds

    UM2353 Microcontroller and connections Table 7. MCU - Connections to LEDs Component: U1 MCU pin number name 1 (C) 1(C) PC10 1(C) 1(C) PC12 1(C) 1(C) PB12 1(C) PB13 1(C) PC11 1(C) PB14 1(C) PB15 1(C) 1(C) 1(C) Table 8. MCU - connections to RF switches Component: U1 Component: S1...

  • Page 14: Firmware Programming

    There are two options how to program the firmware of the STM32L476RG microcontroller: The simplest way to program a new firmware version to the MCU is by connecting the ST25RU3993-EVAL board to the host PC with the micro USB cable and use the “Firmware Update” function of the GUI. For more information about this option refer to the user manual of the GUI.

  • Page 15: Boot Mode

    Entering the boot mode Power supply The ST25RU3993-EVAL is supplied by the USB 3.0 port of the host PC. An USB 3.0 port is required if the long range configuration using the external PA is set. If an USB 3.0 port is not available an USB 2.0 Y-cable or an external power supply can be used to enable the long range capabilities of reader.

  • Page 16: Table 12. Typical Voltage Levels

    UM2353 Power supply Figure 9. Connecting an external supply voltage The 5 V (VBUS) of the USB port is connected to three low-dropout regulators, which supply: • Digital components • RF components • External power amplifier For the digital components a 3.3 V supply is provided. RF components are supplied by 3.6 V and the external power amplifier is supplied by 4.1 V.

  • Page 17: Table 14. Digital Components Connected To 3V3 (3.3 V)

    UM2353 Power supply Table 14. Digital components connected to 3V3 (3.3 V) 3V3 (3.3 V) Schematic page Component Pin name Pin number External_Interfaces External_Interfaces External_Interfaces VBAT Controller 19, 32, 48, 64 Controller VDDA/VREF+ Controller NRST Controller BOOT0 Controller D1-D8, D11-D13, D16, D17 Power_Amplifier UHF_RFID UHF_RFID...

  • Page 18: Test Points

    UM2353 Test points Test Points The ST25RU3993-EVAL board provides numerous test points to test and to evaluate the ST25RU3993 reader device, and important circuit nodes in the reader design. Figure 10. Test points UM2353 - Rev 2 page 18/48...

  • Page 19: Supply Voltage Test Points

    UM2353 Test points 5.6.1 Analog test points Table 17. Analog test point connections Component: U5 Component: U2 Component: U3 Analog ST25RU3993 ST25RU3993 Power det. Power det. test point pin name pin number pin name pin number pin name pin number OSCO ATP1 VCO (LF_CEXT)

  • Page 20: Digital Test Points

    UM2353 Test points Figure 12. Connection an ampere meter to the supply voltage test points 5.6.3 Digital test points In addition to the four test points shown above a test point for each LED, connected to the STM32L476RG controller is placed. PLL OK: Indicates that the PLL of ST25RU3993 is locked and the carrier frequency is stable.

  • Page 21: Probing Rf Signals

    ANT2: Low active. Indicates that antenna port 2 is active. 5.6.4 Probing RF signals The ST25RU3993-EVAL board features four RF test points to measure RF power levels in-circuit. The Figure 13 shows available RF test points. Figure 13. RF test points In order to make use of these test points a connection adapter is required.

  • Page 22: Table 19. Rf Test Points - Default Power Levels

    Connecting to the RF test points with the SMB adapter In the Table 19 it is listed what typical power levels can be expected while the ST25RU3993-EVAL board is operating in its default configuration. Table 19. RF test points - default power levels...

  • Page 23: Table Of Contents

    UM2353 Schematics Schematics The following schematics are listed: • Figure 15. Schematic diagram of system overview • Figure 16. Schematic of UHF RFID reader device • Figure 17. Schematic of external power amplifier • Figure 18. Schematic of carrier cancellation circuit •...

  • Page 24: Figure 15. Schematic Diagram Of System Overview

    Figure 15. Schematic diagram of system overview UHF RFID reader Power amplifier Carrier Cancellation Antenna switch Title page UHF_RFID.SchDoc Power_Amplifier.SchDoc Carrier_Cancellation.SchDoc Antenna_switch.SchDoc Title_Page.SchDoc 93_RF_OUT 93_RF_OUT TX TX_RX TX_RX 93_intPA 93_intPA Ext_PA_BIAS 93_Signals RF_Detector ANT_SW_V2 RX_D PA_SW_V1 OSCO ANT_SW_V1 PA_SW_V2 RX_D Carrier_ Project page Cancellation...

  • Page 25: Figure 16. Schematic Of Uhf Rfid Reader Device

    Figure 16. Schematic of UHF RFID reader device...

  • Page 26: Figure 17. Schematic Of External Power Amplifier

    Figure 17. Schematic of external power amplifier...

  • Page 27: Figure 18. Schematic Of Carrier Cancellation Circuit

    Figure 18. Schematic of carrier cancellation circuit Figure 19. Schematic of antenna switch...

  • Page 28: Figure 20. Schematic Of Usb Supply / Uart Bridge

    Figure 20. Schematic of USB supply / UART bridge...

  • Page 29: Figure 21. Schematic Of Microcontroller

    Figure 21. Schematic of microcontroller...

  • Page 30: Figure 22. Schematic Of Supply Ldos

    Figure 22. Schematic of supply LDOs...

  • Page 31: Figure 23. Schematic Of External Interfaces And Connections

    Figure 23. Schematic of external interfaces and connections...

  • Page 32: Figure 24. Schematic Of Bt Classic Module

    Figure 24. Schematic of BT classic module...

  • Page 33: Figure 25. Schematic Of Rf Shield

    Figure 25. Schematic of RF shield...

  • Page 34: Pcb Stack Up

    UM2353 PCB stack up PCB stack up The ST25RU3993-EVAL board has in total six layers. The dielectric material between all copper layers is FR-4 type. No blind or buried vias are used on the ST25RU3993-EVAL board. Table 20. PCB layer stack...

  • Page 35: Pcb Layout

    UM2353 PCB layout PCB layout The ST25RU3993-EVAL board has six layers. The sections below show each layer and provide additional information. UM2353 - Rev 2 page 35/48...

  • Page 36: Top Layer

    UM2353 Top layer Top layer On the Top layer all components are placed. Therefore all component connections are done on this layer. All RF routing including 50 Ω - coplanar wave guide with ground plane, 100 Ω differential traces are done on the top layer.

  • Page 37: Rf Gnd Layer

    UM2353 RF GND layer RF GND layer The RF GND layer directly below the top layer is needed for the 50 Ω and 100 waveguide traces. The spacing between top layer and RF GND layer is relevant for the impedance of the wave-guides. RF currents tend to run back to its source directly underneath the wave-guides.

  • Page 38: Power Layer

    UM2353 Power layer Power layer The power layer is used to distribute the supply voltages through power planes as well as with few traces. Figure 29. Layout - Power layer UM2353 - Rev 2 page 38/48...

  • Page 39: Gnd Layer

    UM2353 GND layer GND layer Figure 30. Layout - GND layer UM2353 - Rev 2 page 39/48...

  • Page 40: Routing Layer

    UM2353 Routing layer Routing layer The Routing layer is used to interconnect the components, which help to minimize cross-talk effects on RF traces. Figure 31. Layout - Routing layer UM2353 - Rev 2 page 40/48...

  • Page 41: Bottom Layer

    UM2353 Bottom layer Bottom layer The bottom layer mostly consists of a GND plane, which acts as a shield for the above lying Routing layer. Figure 32. Layout - Bottom layer UM2353 - Rev 2 page 41/48...

  • Page 42: Federal Communications Commission (Fcc) And Industry Canada (Ic) Compliance

    UM2353 Federal Communications Commission (FCC) and Industry Canada (IC) compliance statements Federal Communications Commission (FCC) and Industry Canada (IC) compliance statements FCC Compliance Statement 9.1.1 Part 15.19 This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

  • Page 43: Table 21. Document Revision History

    Introduction, Section 4 ST25RU3993-EVAL board features, Section 5.1 RF circuit, Section 5.3 Firmware programming 12-Nov-2018 • Figure 1. ST25RU3993-EVAL board (top view), Figure 3. Functional block diagram, Figure 7. Main digital interfaces, Figure 10. Test points, Figure 13. RF test points, Figure 14.
  • Page 44 ST25RU3993-EVAL board features ........
  • Page 45 UM2353 Contents IC Compliance Statement ............42 9.2.1 Compliance Statement .
  • Page 46 UM2353 List of tables List of tables Table 1. TCXO/Crystal Configuration ............7 Table 2.
  • Page 47 ST25RU3993-EVAL board (top view)........
  • Page 48 ST’s terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’...

Table of Contents