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.
OSC OK:
Low active. Indicates that the reference frequency for the PLL is stable.
No Tag Response:
Is pulled low if the sent reader 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 reader is in its long range configuration.
INT_PA:
Is pulled low if the reader is in its short range configuration.
TUNING:
Is pulled low if the reader currently is re-tuning the carrier cancellation circuit.
Tuned:
Low active. Indicates that the self-jamming signal is sufficiently suppressed.
RF ON:
Low active. Indicates that the RF carrier is ON.
ANT1:
Low active. Indicates that antenna port 1 is active.
UM2353
Test points
UM2353
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Rev 2
page 20/48
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...