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ST25R3911B Datasheet(PDF) 96 Page - STMicroelectronics

Part # ST25R3911B
Description  High performance HF reader / NFC initiator with 1.4 W supporting VHBR and AAT
PDF  116 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25R3911B Datasheet(HTML) 96 Page - STMicroelectronics

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Pinouts and pin description
The ST25R3911B pin and pad assignments are described in Figure 29 .
Figure 29. ST25R3911B QFN32 pinout
33
25
26
1
3
0
3
9
2
8
2
7
2
32
1
2
3
4
5
6
7
8
VDD_IO
VSP_D
CSO
XTO
XTI
VSN_D
VSP_A
VDD
9
5
1
6
1
3
1
4
1
1
1
2
1
10
24
23
22
21
20
19
18
17
AGD
RFI2
RFI1
VSS
TRIM2_0
TRIM1_0
TRIM2_1
TRIM1_1
QFN32
Note:
The above figure shows the package top view.
Table 94. ST25R3911B pin definitions - QFN32 package
Pin number
Pin name
Pin type
Description
1
VDD_IO
Supply pad
Positive supply for peripheral communication
2
CSO
Analog output
Capacitor sensor output
3
VSP_D
Digital supply regulator output
4
XTO
Xtal oscillator output
5
XTI
Analog input / Digital input
Xtal oscillator input
6
VSN_D
Supply pad
Digital ground
7
VSP_A
Analog output
Analog supply regulator output
8
VDD
Supply pad
External positive supply
9
VSP_RF
Analog output
Supply regulator output for antenna drivers
10
RFO1
Antenna driver output
11
RFO2
12
VSN_RF
Supply pad
Ground of antenna drivers
13
TRIM1_3
Analog I/O
Input to trim antenna resonant circuit
14
TRIM2_3
15
TRIM1_2
16
TRIM2_2
ST25R3911B
Pinouts and pin description
DS11793 - Rev 6
page 96/116



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