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AS3911 Datasheet(PDF) 49 Page - ams AG

Part # AS3911
Description  NFC Initiator / HF Reader IC
PDF  149 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3911 Datasheet(HTML) 49 Page - ams AG

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ams Datasheet, Confidential: 2013-Oct [2-03]
AS3911 – 49
Appl icatio n I n f o rm a t i o n
D1
Unmask Receive
Data
Receive data following this
command is normally
processed (this command
has priority over internal
mask receive timer)
Yes
No
en, rx_en
D2
(see note 2)
Not used
D3
Measure
Amplitude
Amplitude of signal
present on RFI inputs is
measured, result is stored
in A/D Converter Output
Register
No
Yes
en
D4
Squelch
Performs gain reduction
based on the current noise
level
No
No
en, rx_en
D5
Reset Rx Gain
Clears the current Squelch
setting and loads the
manual gain reduction
from Receiver
Configuration Register 4
No
No
en (10)
D6
Adjust Regulators
Adjusts supply regulators
according to the current
supply voltage level
No
Yes
en (5)
D7
Calibrate
Modulation Depth
Starts sequence which
activates the Tx, measures
the modulation depth and
adapts it to comply with
the specified modulation
depth
No
Yes
en
D8
Calibrate Antenna
Starts the sequence to
adjust parallel
capacitances connected to
TRIMx pins so that the
antenna LC tank is in
resonance
No
Yes
en
D9
Measure Phase
Measurement of phase
difference between the
signal on RFO and RFI
No
Yes
en
DA
Clear RSSI
Clears RSSI bits and
restarts the measurement
Yes
No
en
DC
Transparent Mode
Enter in Transparent mode
No
No
en
DD
Calibrate
Capacitive Sensor
Calibrates capacitive
sensor
No
Yes
(see note 6)
Command
Code
(hex)
Command
Comments
Command
Chaining
Interrupt
after
Termination
Operation
Mode (1)



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