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AS3911 Datasheet(PDF) 104 Page - ams AG

Part # AS3911
Description  NFC Initiator / HF Reader IC
PDF  159 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3911 Datasheet(HTML) 104 Page - ams AG

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Page 104
ams Datasheet
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[v2-11] 2016-Jun-13
AS3911 − Application Information
RFO Normal Level Definition Register
Figure 90:
RFO Normal Level Definition Register
Note(s):
1. Default setting is set at power-up and after Set Default command.
2. Applying value FFh to the register 27h will put the drivers in tristate.
External Field Detector Threshold Register
Figure 91:
External Field Detector Threshold Register
Note(s):
1. Default setting is set at power-up and after Set Default command.
Address 27h: RFO Normal Level Definition Register
Type: RW
Bit
Name
Default
Function
Comments
7droff7
0
Bit7 = 2
Ω
Antenna drivers are composed of 8
binary weighted segments. Setting
a bit droff to 1 will disable
corresponding segment during
normal non-modulated operation.
The TX drivers are made up of 8
segments. Binary weighted from
2
Ω to 256 Ω. y setting register 0x27
to 0xc0 you disable the 2
Ω and 4Ω
segments.
6droff6
0
Bit6 = 4
Ω
5droff5
0
Bit5 = 8
Ω
4
droff4
0
Bit4 = 16
Ω
3droff3
0
Bit3= 32
Ω
2
droff2
0
Bit2 = 64
Ω
1
droff1
0
Bit1 = 128
Ω
0
droff0
0
Bit0 = 256
Ω
Address 29h: External Field Detector Threshold Register
Type: RW
Bit
Name
Default
Function
Comments
7Not used
6trg_l2
0
Peer Detection Threshold MSB
Peer Detection Threshold.
Refer to Peer Detection
Threshold as Seen on RFI1
Input.
5trg_l1
1
4trg_l0
1
Peer Detection Threshold LSB
3
rfe_t3
0
Collision Avoidance Threshold MSB
Collision Avoidance Threshold.
Refer to Collision Avoidance
Threshold as Seen on RFI1
Input.
2rfe_t2
0
1rfe_t1
1
0
rfe_t0
1
Collision Avoidance Threshold LSB



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