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ST25R3911B 데이터시트(PDF) 19 Page - STMicroelectronics

부품명 ST25R3911B
상세설명  Automatic antenna tuning system providing tuning of antenna LC tank
PDF  129 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25R3911B 데이터시트(HTML) 19 Page - STMicroelectronics

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ST25R3911B
Functional overview
71
Table 3 provides information on the recommended filter settings. For all supported operation
modes and receive bit rates there is an automatic preset defined, additionally some
alternatives are listed. Automatic preset is done by sending direct command Analog Preset.
There is no automatic preset for Stream and Transparent modes. Since the selection of the
filter characteristics also modifies gain, the gain range for different filter settings is also
listed.
Digitizing stage
The digitizing stage produces a digital representation of the sub-carrier signal coming from
the receiver. This digital signal is then processed by the receiver framing logic. The digitizing
stage consists of a window comparator with adjustable digitizing window (five possible
Table 2. Low pass control
rec1<5> lp2
rec1<4> lp1
rec1<3> lp0
-1 dB point
0
0
0
1200 kHz
001
600 kHz
011
300 kHz
100
2 MHz
101
7 MHz
Others
Not used
Table 3. Receiver filter selection and gain range
Gain (dB)
Comments
Max
all
Min1
Max23
Max1
Min23
Min
all
With
boost
000
0
0
0
43.4
28.0
26.4
11.0
49.8
Automatic preset for ISO14443A fc/128 and NFC
Forum Type 1 Tag
000
1
0
0
44.0
29.0
27.5
12.0
49.7
Automatic preset for ISO14443B fc/128 ISO14443
fc/64
001
1
0
0
44.3
29
27.0
11.7
49.8
Recommended for 424/484 kHz sub-carrier
000
0
1
0
41.1
25.8
23.6
8.3
46.8
Alternative choice for ISO14443 fc/32 and fc/16
100
0
1
0
32.0
17.0
17.2
2.0
37.6
Automatic preset for ISO14443 fc/32 and fc/16
Alternative choice for fc/8 (1.7 kb/s)
100
0
0
0
32.0
17.0
17.2
2.0
37.6
Alternative choice for fc/8 (1.7 kb/s)
000
0
1
1
41.1
25.8
23.6
8.3
46.8
Automatic preset FeliCa™ (fc/64, fc/32)
Alternative choice for ISO14443 fc/32 and fc/16
101
0
1
0
30.0
20.0
12.0
2.0
34.0
Alternative choice for fc/8 and fc/4
101
1
0
0
30.0
20.0
12.0
2.0
34.0
Automatic preset for fc/8 and fc/4
000
1
0
1
36.5
21.5
24.9
9.9
41.5
Automatic preset for NFCIP-1 (initiator and target)



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