AS3991-BQFT austriamicrosystems, AS3991-BQFT Datasheet - Page 26

• 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
RX Options (03) - Gen 2
Table 16. RX Options (03)
1. Preset at por=H or EN=L
TRcal Low Register (04) – Gen2
Table 17. TRcal Low Register (04)
1. Preset at por=H or EN=L
TRcal High and Miscellaneous Register (05) – Gen 2
Table 18. TRcal High and Miscellaneous Register (05)
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Gen2: 60 (160kHz)
Gen2: 35 (1333 steps: 133.3µs, DR=64/3(bit DR=1) => LF=160µs)
Bit
Bit
Bit
B7
B6
B5
B4
B3
B2
B1
B0
B7
B6
B5
B4
B3
B2
B1
B0
B7
B6
B5
Signal Name
Signal Name
Signal Name
vdd_io_low
vext_low
Rx_LF3
Rx_LF2
Rx_LF1
Rx_LF0
TRcal7
TRcal6
TRcal5
TRcal4
TRcal3
TRcal2
TRcal1
TRcal0
1
TRext
RFU
-
-
-
1
Link frequency selection
don’t care
don’t care
RX preamble length
don’t care
Decrease VDD_MIX
Supports low peripheral
communication voltage
TRcal <0:11> is a 12 bit
TRcal <11> is the MSB.
TRcal <0> is the LSB,
number (0 to 4095),
TRcal time
Function
Function
Function
Revision 3.81
RFU
1
0000: 40kHz
0011: 80kHz
0110: 160kHz
1000: 213.3kHz
1001: 256kHz
1100: 320kHz
1111: 640kHz
Set to 0
Set to 0
0: Short preamble
1: long preamble
Short preamble is supported for Miller 4 and
Miller 8 coding.
Set to 0
Gen2: 17.2µs…225µs
TRcal range 0.1µs…409µs (1…4096 steps)
step size 0.1µs
worst case relative resolution (0.1us/
17.2us=0.6%)
reserved for future use (RFU)
0: 4.8V
1: 3.7V
When high decreases output resistance of
logic outputs. Should be set high when
VDD_IO voltage is below 2.7V.
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