AS3991-BQFT austriamicrosystems, AS3991-BQFT Datasheet - Page 16

• 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 - D e t a i l e d D e s c r i p t i o n
Table 7. EPC_gen2 - Tari Combinations
Direct Mode
Direct mode is applied if the user wants to use analog functions only and bypass the protocol handling supported in the
reader IC.
Direct Mode Using Parallel Interface
The reader IC enters the direct mode when option bit ‘direct’ is set to high in the ‘Chip status control register’ (00). As
the direct mode starts immediately, all the register settings that help to configure the operation of the chip needs to be
done prior to entering the direct mode. The ‘write’ command for direct mode should not be terminated by stop condition
since the stop condition terminates the direct mode. This is necessary as direct mode uses four IO pins (IO2, IO3, IO5,
IO6) and normal parallel or serial communication is not possible in direct mode. To terminate the direct mode, the user
needs to send the stop condition. After stop condition, normal communication via. interface and access to the registers
are possible.
Direct Mode Using Serial Interface (SPI)
To enter direct mode via SPI, bit direct should be set to high in the ‘Chip status control register’ (00) and stop condition
(IO4 L-to-H transition) has to be sent. As the direct mode starts immediately, all the register settings that help to
configure the operation of the chip needs to be done prior to entering the direct mode. The direct mode persists till
writing bit direct to low (IO4 H-to-L, SPI write to reg00). Since the direct mode uses four IO pins (IO2, IO3, IO5, IO6), it
is not possible to read registers during the direct mode (IO6 which is MISO in SPI mode is used as direct mode data or
subcarrier output). It is possible to write register 00 to terminate the direct mode. After direct mode termination, normal
communication via SPI interface and access to the registers are possible.
For more information on transmit modulation input signal possibilities, refer to
For more information on the receive output signal possibilities, refer to
www.austriamicrosystems.com
213.3
213.3
640
160
256
320
640
160
256
320
640
Zero and one length (RT CAL)
40
80
40
80
TARI settings
64/3
64/3
64/3
64/3
64/3
64/3
64/3
64/3
8
8
8
8
8
8
8
200.00
100.00
533.33
266.67
133.33
100.02
33.33
50.00
37.51
31.25
25.00
12.50
83.33
66.67
33.33
2.1333
1.6003
1.3333
Revision 3.81
2.5
1.6
-
-
-
-
-
-
-
-
-
-
-
25µs
1.3333
1.7778
1.3335
1.1111
3
-
-
-
-
-
-
-
-
-
-
-
Receiver on page
2.6667
2.1333
2.5
1.6
-
-
-
-
-
-
-
-
-
-
-
-
Modulator on page
12.5µs
1.3333
2.2222
1.7778
18.
3
-
-
-
-
-
-
-
-
-
-
-
-
17.
2.1333
2.4004
2.1333
2.5
1.6
2
-
-
-
-
-
-
-
-
-
-
6.25µs
1.7778
2.0003
1.6667
1.3333
1.7778
16 - 51
3
-
-
-
-
-
-
-
-
-
-