4
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
•
Configurable TX power level
•
Power detector to monitor TX power level
•
Carrier cancellation circuitry
•
Differential RX input
•
Maximum sensitivity: -80 dBm
•
External 20 MHz TCXO, clipped sine wave
•
External reference: 20 MHz crystal
•
Usable frequency range: 840 MHz – 960 MHz
•
Two antenna connectors: SMB (female)
•
USB receptacle: Micro, B-Type
•
USB/UART bridge
•
Main supply: 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:
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Carrier cancellation tuning activity
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Carrier cancellation tuning OK
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OSC OK (20 MHz external reference)
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PLL OK
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RF ON
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No tag response
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Tag CRC error
–
Tag found
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Active antenna port
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Power amplifier option
–
BT OK (not installed)
•
Test points:
–
RF power levels of TX and RX signals
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UART signal lines
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SPI signal lines
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UART_LOG for debugging purposes
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Control voltage of internal VCO
–
RF power detector output voltage
–
20 MHz reference signal
–
External PA BIAS voltage
–
LDO output voltages
–
Enable line of LDO for power amplifier
•
Jumper for current consumption measurements:
UM2353
ST25RU3993-EVAL board features
UM2353
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Rev 2
page 5/48
Summary of Contents for ST25RU3993-EVAL
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 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 39: ...8 4 GND layer Figure 30 Layout GND layer UM2353 GND layer UM2353 Rev 2 page 39 48...