AS3991-BQFT austriamicrosystems, AS3991-BQFT Datasheet - Page 38

• Manufacturer Part Number: AS3991-BQFT
• Description: IC UHF RFID READER 64-QFN
• Manufacturer: austriamicrosystems

Specifications of AS3991-BQFT

• Rf Type: Read / Write
• Frequency: 840MHz ~ 960MHz
• Features: ISO-18000-6
• Package / Case: 64-VFQFN, Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AS3991-BQFT; AS3991-BQFTTR

AS3990/AS3991
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
TX Length Byte2 – adr 1E hex low nibbles of complete bytes, which will be transferred through FIFO and information
if there is broken byte and how many bits from it should be transferred.
Table 43. TX Length Byte2 - adr 1E hex
1. Default: reset to 00 at pro=H and EN=L
Note: For transmission, the register 1E is write only. The written value is used for the transmission but can not be
FIFO I/O Register – adr 1F hex 24 bytes FIFO register filled and read in cyclical way.
Direct Commands
Table 44
the command bit (MSB) high as described in the MCU control interface description below.
Table 44. Command Codes
www.austriamicrosystems.com
read out by the micro controller. For reception bits B0 to B4 are read only. The value read out is the number of
valid bits in the last received byte. Bits B0 to B4 are updated at the end of the last successful reception. In case
the last received byte is not complete, the valid bits are on the LSB side.
Bit
B7
B6
B5
B4
B3
B2
B1
B0
lists out the direct commands supported in the UHF reader IC. The value in the first column (Cmd) includes
Cmd (hex)
8F
80
83
84
85
87
90
91
92
93
94
96
97
98
99
Signal Name
Txl3
Txl2
Txl1
Txl0
Bb2
Bb1
Bb0
Bbf
1
number of complete byte– bn[3]
number of complete byte– bn[2]
number of complete byte– bn[1]
number of complete byte– bn[0]
broken byte number of bits bb[2]
broken byte number of bits bb[1]
broken byte number of bits bb[0]
broken byte flag
Idle
Soft init (software initialization, same as power on reset)
Hop to main frequency
Hop to auxiliary frequency
Trigger AD conversion
Reset FIFO
Transmission with CRC
Transmission with CRC expecting header bit (Gen2 RX)
Transmission without CRC
Delayed transmission without CRC (not used in EPC Gen2)
Delayed transmission with CRC (not used in EPC Gen2)
Block RX
Enable RX
Query (=TX with TX CRC5, no RX CRC)
QueryRep (=TX no TX CRC, no RX CRC)
Revision 3.81
Function
Command
Low nibble of complete bytes to be
transmitted or received.
Number of bits in the last (broken) byte
to be transmitted or number of bits that
is valid in the last (broken) received
byte. It is taken into account only when
broken byte flag is set.
1: indicates that last byte is not
complete 8 bit wide.
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