NXP Semiconductors PN7462 series User Manual page 36

NXP Semiconductors
(1)
T X2
antenna
T X1
supply
PN7462 family
T VSS
(1) Using the PN7462 family´s TXLDO
(2) Without using PN7462 family´s TXLDO
The capacitance value must be chosen so that the capacitance value is correct at 5 V
Fig 12. Powering the contactless interface – using an external RF transmitter supply
6.1.3 Contact reader supply
In order to use the contact reader functionality of the PN7462 family, following pads need
to be supplied:
• VBUS
• PVDD_IN (if PVDD_OUT is not used needs to be shorted to GND)
• VBUSP
• DVDD pin must be connected to VDD and buffered with 1 µF capacitor to GND
For SPI/ I²C master interface following supply is also needed
• PVDD_M_IN
The contact interface is powered through VBUSP which is connected to VBUS, as shown
on the schematic in
The various ISO 7816 contact card classes (A, B, or C) require different voltages:
• VBUSP > 2.7 V: support of class B and class C contact cards
• VBUSP > 3 V: support of class A contact cards
Remark: To support Class A cards, DC-to-DC converter has to be used. To support
Class B cards with VBUSP < 3.9 V, DC-to-DC converter also has to be used. The
13.shows how to connect the contact interface related pins, when no contact interface is
used.
UM10858
User manual
COMPANY PUBLIC
VBUS PN7462 family
supply
470 nF
PN7462 family
VUP_T X
RF transmitter
supply
1 µF
T VDD_OUT
T VDD_IN
6.8 µF
Fig 13.
All information provided in this document is subject to legal disclaimers.
Rev. 1.4 — 14 May 2018
314514
PN7462 family HW user manual
(2)
T X2
antenna
T X1
supply
PN7462 family
T VSS
UM10858
VBUS PN7462 family
supply
470 nF
VUP_T X
T VDD_OUT
PN7462 family
T VDD_IN
RF transmitter
supply
6.8 µF
aaa-021 144
Fig
© NXP B.V. 2018. All rights reserved.
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