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ST25R3911B Datasheet(PDF) 101 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) 101 Page - STMicroelectronics

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Symbol
Parameter
Min Typ Max
Unit
Comments
•
resistance of MSB segment multiplied by two is the value of RRFO.
Zload
Load impedance
across
RFO1 and RFO2
8
10
50
Ω
Using a load impedance lower than the minimum value can result in permanent
damage to the device.
VRFI
RFI input sensitivity
-
0.5
-
mVrms fSUB = 848 kHz, AM channel with peak detector input stage selected.
RRFI
RFI input resistance
5
10
15
kΩ
-
VPOR
Power on Reset
voltage
1.31 1.5 1.75
V
-
VAGD
AGD voltage
1.4
1.5
1.6
V
Register 00h set to 0Fh (no clock on MCU_CLK), register 01h set to C0h (3 V
supply mode, disable VSP_D), register 02h set to 80h, register 03h set to 08h, other
registers in default state, short VSP_A and VSP_D.
VREG
Regulated voltage
2.80 3.0 3.32
V
Manual regulator mode, regulated voltage set to 3.0 V, measured on pin VSP_RF:
register 00h set to 0Fh, register 01h set to 80h (3 V supply mode), register 02h set
to E8h (one channel Rx, enable Tx), register 2Ah set to D8h.
TOSC
Oscillator
start-up time
0.65 0.7
10
ms
13.56 MHz or 27.12 MHz crystal
ESRMAX= 150 Ω max, load capacitance according to crystal specification, IRQ is
issued once the oscillator frequency is stable. This parameter changes with
ESRMAX parameter.
ST25R3911B
Electrical specifications
DS11793 - Rev 6
page 101/116



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