AS3991-BQFT austriamicrosystems, AS3991-BQFT Datasheet - Page 34

• 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
Table 33. CL_SYS, Analog Out and CP Control (14)
1. Preset at por=H or EN=L
Modulator Control Register (15) – (three bytes deep)
Table 34. Modulator Control Register (15)
www.austriamicrosystems.com
Default setting: 00 04 40 (Medium VCO bias, CLSYS: 5MHz, min. CP current)
17:16
13:8
7:6
Bit
23
22
21
20
19
18
15
14
Bit
1
0
mod_dep<5:0>
ask-rate<1:0>
Signal Name
main_mod
trfon<1:0>
aux_mod
use_corr
e_amod
lin_mod
tpreset
pr-ask
e_lpf
Signal Name
cp<1>
cp<0>
Analog modulation
Modulation connected to main TX
Modulation connected to aux. TX
Test bit
Enable low pass filter
ASK Modulation transient rate
Selects linear modulation transient
PR-ASK enable
ASK modulation depth/
PR delimiter adjust
RF on/off transition time
Charge pump current
1
Function
RFU
1
Revision 3.81
Function
0: IO3 is digital modulation input in direct
mode.
1: ADC is analog mod. input in direct mode
(allowed when ADC not used).
Should be low for normal operation
reserved for future use (RFU)
00: Tari determined
01: Skip 2
10: Skip 4
11: Skip 8
Default is shaped modulation transient for
ASK and PR-ASK modulation.
In case Tari is 25µs, the ook_ask bit defines
delimiter transient in PRASK modulation
mode: ook_ask=1 forces ASK shaped
transient, ook_ask=0 forces PRASK shaped
transient. In case Tari is 12.5µs or 6.25µs,
the ASK delimiter transient is used
regardless ook_ask bit value.
ASK shaped delimiter transient offers
correct and adjustable delimiter length. The
TX spectrum is not affected to a visible level
due to ASK delimiter transient. Other field
transitions are done in PRASK mode.
in case pr_ask=0 and ook_ask=0: 00…3E:
ASK modulation depth, 3F: 100%
in case pr_ask=1 or ook_ask=1: Adjust
delimiter length, range 9.6µs to 15.9µs, step
0.1µs. 1D=12.5µs
00: Tari determined
01: 100µs
10: 200µs
11: 400µs
00: 150µA
01: 300µA
10: 600µA
11: 1200µA
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