AS3909 Просмотр технического описания (PDF) - austriamicrosystems AG
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AS3909 Datasheet PDF : 77 Pages
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Application Information
Code
000111
001000
001001
001010
010000
010001
010010
010011
010100
010101
010110
010111
011000
011001
011010
011100
Command
Transmit WUPA
NFC transmit with Initial RF
Collision Avoidance
NFC transmit with Response
RF Collision Avoidance
NFC transmit with Response
RF Collision Avoidance with
n=0
Mask receive data
Unmask receive data
AD convert
Measure RF
Squelch
Clear Squelch
Adjust regulators
Calibrate modulation depth
Calibrate antenna (1)
Check antenna resonance
Clear RSSI
Transparent mode
Comments
Transmits WUPA command (ISO-14443A mode only)
Equivalent to Transmit with CRC with additional RF
Collision Avoidance
Equivalent to Transmit with CRC with additional RF
Collision Avoidance
Equivalent to Transmit with CRC with additional RF
Collision Avoidance
Receive after this command is ignored
Receive data following this command is normally
processed (this command has priority over internal
mask receive timer)
A/D conversion of signal on AD_IN pin is performed,
result is stored in A/D Converter Output Register
RF amplitude is measured, result is stored in A/D
Converter Output Register
Performs gain reduction based on the current noise
level.
Resumes gain settings which were in place before
sending Squelch command
Adjusts supply regulators according to the current
supply voltage level
Starts sequence which activates the TX, measures the
modulation depth and adapts it to comply with the
specified modulation depth
Starts the sequence to adjust parallel capacitances
connected to TRIMx pins so that the antenna LC is in
resonance.
Measurement of antenna LC tank resonance to
determine whether calibration is needed.
Clears RSSI bits and restarts the measurement
Enter in Transparent mode
Note(s) and/or Footnote(s):
1. Only available in AS3910.
Set Default
This direct command puts the AS3909/10 in the same state as
power-up initialization. All registers are initialized to the default
state. Please note that results of different calibration and adjust
commands are also lost. This direct command is accepted in all
operating modes.
ams Datasheet, Confidential: 2013-Oct [3-02]
AS3909/AS3910 – 29
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