AS3991-BQFT austriamicrosystems, AS3991-BQFT Datasheet - Page 47

• 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
Timing Parameters
Table 47. Timing Parameters
FIFO
The FIFO is loaded in a cyclical manner. The FIFO and its pointers should be cleared by the Reset FIFO command
(0F) prior each FIFO write for transmission. Data coming from the MCU is stored in the FIFO at address 1F hex from
location 0 to 23. When the bytes are loaded in the reader, the input FIFO counter is counting the number of bytes
loaded into the FIFO. When data is read from the FIFO, an output FIFO counter is incremented and it follows the status
of the bytes read.
The input and output counters are 12 bits each. They are used to control the data flow in and out of the FIFO. This
control sends an interrupt request if the number of bytes in the FIFO is less than 6 and if number of bytes increases to
above 18 so that MCU can send new data or remove the data as necessary. It additionally checks that the number of
data bytes to be sent does not surpass the value defined in ‘TX length’ bytes. It also signals the transmit logic when the
last data to be sent was moved from FIFO to the transmit logic. The number of bytes in the FIFO is available in the
FIFO status register. This register also contains three status flags:
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General
Write timing
Read timing
Symbol
BR
t
t
t
Fove bit is set in case of FIFO overflow
Flol bit is set in case of low FIFO level during transmission
Fhil bit is set in case of high FIFO level during reception
t
DOH
DOD
t
t
t
DIH
DIS
CH
EH
CL
SDI
Data in setup time
Data out hold time
Data in hold time
Enable hold time
Clock high time
Clock low time
Data out delay
Parameter
Bit rate
Revision 3.81
Conditions
-
-
-
-
-
-
-
-
Min
250
250
300
150
20
10
Typ
Max
150
2
Units
Mbps
47 - 51
ns
ns
ns
ns
ns
ns
ns