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NXP Semiconductors
UM10883
PN7462 family Quick Start Guide - Development Kit
UM10883
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User manual
COMPANY PUBLIC
Rev. 1.6 — 14 May 2018
319816
30 of 120
Fig 32.
Power supply status LEDs
5.4 Supply options for PVDD, PVDD_M, VUP_TX and TVDD
The PN7462AU allows different options of supplying:
•
PVDD_IN (pad supply voltage input)
•
PVDD_M_IN (pad supply voltage input for master interfaces)
•
VUP_TX (supply of the contactless TX_LDO)
•
TVDD_IN (antenna driver supply voltage input)
5.4.1 Supply options for PVDD and PVDD_M
The default power setting for pad supply is to use the internal LDO supply for PVDD and
PVDDM, in this cases JP42 is open and resistor jumper R181 and R179 placed.
If external 3V3 supply is needed then R179 and R181 needs to be removed. JP42 closed
to turn off internal LDO and 3V3 directly soldered to the R179 and R181 pads marked
red Fig 33.
5.4.2 Supply options for VUP_TX
Internal contactless TX LDO is by default supplied from on board 5V LDO. In this case
resistor jumper R213 is placed and R188 removed.
To supply VUP_TX from external source from JP16 pin 2, R213 needs to be removed
and resistor jumper R188 needs to be placed. See Fig 33, jumper resistors are marked
green.
5.4.3 Supply options for TVDD
Antenna driver supply voltage input, TVDD_IN is by default supplied from the board’s 5V
LDO. In this case (on board 5V) jumper JP1 is closed (see Fig 25).
To supply TVDD_IN from external source from JP16 pin 3, the jumper resistor R191
needs to be placed and R189 needs to be removed. The jumper resistors R189 and
R191 are marked yellow on the Fig 33.