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ST ST25RU3993-EVAL User Manual Download Page 24

Figure 15. 

Schematic diagram of system overview

Title page
Title_Page.SchDoc

Project page
Project_Page.SchDoc

DC supply
Supply.SchDoc

Extenal interfaces
Extenal_interfaces.SchDoc

USB interfaces
USB_interfaces.SchDoc

SPI

93_Signals

Carrier_Cancellation

JLINK
UART

OSCO

VCO

Ext_PA_BIAS

MUC_RESET_N

UART_LOG_TX

RF_Detector

PA_LDO_EN

BTC_JT

PA_LDO_EN

UART

UHF RFID reader
UHF_RFID.SchDoc

93_intPA

93_RF_OUT

SPI
93_Signals

OSCO

VCO

RX_D

TX TX_RX

Carrier_
Cancellation

SPI

RX_D

ANT_SW_V2

ANT_SW_V1

TX_RX

93_intPA

93_RF_OUT

Ext_PA_BIAS
RF_Detector
PA_SW_V1
PA_SW_V2

TX

Mechanical
Mechanical.SchDoc

SPI

93_Signals

Carrier_Cancellation
JLINK
UART

PA_SW_V2
PA_SW_V1
RF_Detector

ANT_SW_V2
MCU_RESET_N

ANT_SW_V1

UART_LOG_TX

PA_LDO_EN

SPI

BTC_RESET

BTC_BOOT

Power amplifier
Power_Amplifier.SchDoc

Carrier Cancellation
Carrier_Cancellation.SchDoc

Antenna switch
Antenna_switch.SchDoc

SPI

BTC_RESET

BTC_BOOT

BTC_JT

UM2353

 - 

Rev 2

page 24/48

UM2353

 

Summary of Contents for ST25RU3993-EVAL

Page 1: ...e 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...

Page 2: ...l 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 General information UM2353 Rev 2 pa...

Page 3: ...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 coax cable An UHF transponder is within range of the antenna read...

Page 4: ...oupler DC1722J5020AH 10 dB Coupler DC1722J5020AH Carrier cancellation circuit LED MCU LED intPA LED Tuning LED Tuned LED Tag LED RF LED extPA LED PLL LED OSC LED ANT1 LED ANT2 LED NO_RESP Led CRC_ERR...

Page 5: ...5V USB powered 1 A STM32L476RGT6 Arm 32 bit Cortex M4 64 MHz 128 Kbyte RAM 1 Mbyte Flash SPI mode 4MHz SWD debug interface LED indicators Carrier cancellation tuning activity Carrier cancellation tuni...

Page 6: ...Boot Mode BT module reset button not installed Buzzer Wireless Interface not installed BT 4 0 SPP Profile JTAG interface for BT module programming BT module boot mode jumper UM2353 ST25RU3993 EVAL boa...

Page 7: ...ed in close proximity An additional low pass filter stage is integrated in ST25RU3993 and is part of the loop filter circuit The loop filter output is the control voltage of the internal VCO The carri...

Page 8: ...o a 20 dB directional coupler which takes a portion of the transmit power 10 mW This sample power is further attenuated by a pi pad attenuator to limit the input power of the logarithmic power detecto...

Page 9: ...carrier cancellation circuit would result to low reflected power measurement result The main components of the carrier cancellation circuit are three digital tunable capacitors which are controlled b...

Page 10: ...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 UM2353 Microcontroller and...

Page 11: ...M32L476RGT6 to convert the RF power into a digital format The LDO U11 for the external power amplifier is controlled by the STM32L476RGT6 which completely shuts down the external power amplifier when...

Page 12: ...D2 1 OAD 2 EN 31 3 IRQ 32 4 NCS 33 5 ADC 6 Table 5 UART connections and pinout Component U1 Component U13 J7 MCU pin name MCUpin number FTDI pin name FTDI pin number Connector pin number NRST 7 RTS 19...

Page 13: ...36 1 C PB2 28 1 C PB1 27 1 C Table 8 MCU connections to RF switches Component U1 Component S1 Component S2 MCU pin name MCU pin number PA switch pin name PA switch pin number Antenna switch pin name...

Page 14: ...SET_N 10 5 3 Firmware programming There are two options how to program the firmware of the STM32L476RG microcontroller 1 The simplest way to program a new firmware version to the MCU is by connecting...

Page 15: ...ble or an external power supply can be used to enable the long range capabilities of reader If neither is available only the short range reader configuration with lower RF power is available If the ST...

Page 16: ...ents 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 Table 12 Typical voltage levels Voltage domain Typical voltage level 3V3 3 33...

Page 17: ...N 5 8 Bluetooth U12 BOOT0 6 9 Bluetooth B14 1 USB_Interface U12 VCCIO 20 1 Via ferrite bead FB3 2 Via pull up resistor R61 3 Via push button B2 4 Via ferrite bead FB4 5 Via ferrite bead FB2 6 Via J19...

Page 18: ...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 Test points UM23...

Page 19: ...1 GND 2 VBUS 2 3V3 2 VSUP 2 VPA 3 3V3 3 VSUP 3 VPA Supply voltage measurement At the output of each of the three LDOs two test points are placed in order to conveniently measure the regulated voltage...

Page 20: ...command is not replied by a tag Tag CRC Error Is pulled low if a CRC error is detected within a tag response Tag found Is pulled low every time a tag has been inventoried EXT_PA Is pulled low if the...

Page 21: ...3 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 connec...

Page 22: ...is the input for the external power amplifier 1 9 dBm RF TP2 External power amplifier RF output signal Measure here to evaluate the power Gain and the spectral properties of the RF signal at the outpu...

Page 23: ...er Figure 18 Schematic of carrier cancellation circuit Figure 19 Schematic of antenna switch Figure 20 Schematic of USB supply UART bridge Figure 21 Schematic of microcontroller Figure 22 Schematic of...

Page 24: ...r UHF_RFID SchDoc 93_intPA 93_RF_OUT SPI 93_Signals OSCO VCO RX_D TX TX_RX Carrier_ Cancellation SPI RX_D ANT_SW_V2 ANT_SW_V1 TX_RX 93_intPA 93_RF_OUT Ext_PA_BIAS RF_Detector PA_SW_V1 PA_SW_V2 TX Mech...

Page 25: ...Figure 16 Schematic of UHF RFID reader device UM2353 Rev 2 page 25 48 UM2353...

Page 26: ...Figure 17 Schematic of external power amplifier UM2353 Rev 2 page 26 48 UM2353...

Page 27: ...Figure 18 Schematic of carrier cancellation circuit Figure 19 Schematic of antenna switch UM2353 Rev 2 page 27 48 UM2353...

Page 28: ...Figure 20 Schematic of USB supply UART bridge UM2353 Rev 2 page 28 48 UM2353...

Page 29: ...Figure 21 Schematic of microcontroller UM2353 Rev 2 page 29 48 UM2353...

Page 30: ...Figure 22 Schematic of supply LDOs UM2353 Rev 2 page 30 48 UM2353...

Page 31: ...Figure 23 Schematic of external interfaces and connections UM2353 Rev 2 page 31 48 UM2353...

Page 32: ...Figure 24 Schematic of BT classic module UM2353 Rev 2 page 32 48 UM2353...

Page 33: ...Figure 25 Schematic of RF shield UM2353 Rev 2 page 33 48 UM2353...

Page 34: ...der resist 4 5 1 Top layer Signal Copper 0 043 Dielectric 1 Dielectric Core 0 25 FR 4 R 1755M 4 7 2 RF GND Signal Copper 0 032 Dielectric 2 Dielectric COre 0 1 FR 4 R 1755M 4 6 3 Power Signal Copper 0...

Page 35: ...8 PCB layout The ST25RU3993 EVAL board has six layers The sections below show each layer and provide additional information UM2353 PCB layout UM2353 Rev 2 page 35 48...

Page 36: ...ng 50 coplanar wave guide with ground plane 100 differential traces are done on the top layer Ground terminals of components have no thermal relief connect to the ground plane Figure 27 Layout top lay...

Page 37: ...source directly underneath the wave guides So it is important that the underlying RF GND layer is solid and uninterrupted providing a direct path for the RF currents If a trace on this layer would run...

Page 38: ...8 3 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 Power layer UM2353 Rev 2 page 38 48...

Page 39: ...8 4 GND layer Figure 30 Layout GND layer UM2353 GND layer UM2353 Rev 2 page 39 48...

Page 40: ...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 Routing layer UM2353 Rev 2 page 40...

Page 41: ...8 6 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 Bottom layer UM2353 Rev 2 page 41 48...

Page 42: ...t 9 2 1 Compliance Statement This device complies with Industry Canada license exempt RSS standard s Operation is subject to the following two conditions 1 this device may not cause interference and 2...

Page 43: ...4 ST25RU3993 EVAL board features Section 5 1 RF circuit Section 5 3 Firmware programming Figure 1 ST25RU3993 EVAL board top view Figure 3 Functional block diagram Figure 7 Main digital interfaces Figu...

Page 44: ...18 5 6 1 Analog test points 18 5 6 2 Supply voltage test points 19 5 6 3 Digital test points 20 5 6 4 Probing RF signals 21 6 Schematics 23 7 PCB stack up 34 8 PCB layout 35 8 1 Top layer 36 8 2 RF GN...

Page 45: ...9 2 IC Compliance Statement 42 9 2 1 Compliance Statement 42 9 2 2 D claration de conformit 42 Revision history 43 UM2353 Contents UM2353 Rev 2 page 45 48...

Page 46: ...ble 10 MCU connections to JTAG interface and pinout 14 Table 11 MCU connections to JLINK SWD interface and Pinout of connector 14 Table 12 Typical voltage levels 16 Table 13 Components connected to 5...

Page 47: ...r 22 Figure 15 Schematic diagram of system overview 24 Figure 16 Schematic of UHF RFID reader device 25 Figure 17 Schematic of external power amplifier 26 Figure 18 Schematic of carrier cancellation c...

Page 48: ...the choice selection and use of ST products and ST assumes no liability for application assistance or the design of Purchasers products No license express or implied to any intellectual property righ...

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