Fig 8. Typical Reading Distance Vs Tvdd Using Om5578 Board; Tvdd Supply Options; Config 1: Vbat Used To Generate Tvdd - NXP Semiconductors PN7150 Hardware Design Manual

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NXP Semiconductors

The strength of the field emitted by the PN7150 is linked to several parameters such as

the antenna geometrical characteristics, the antenna matching circuit and the voltage

level on TX output buffer.

The voltage level on TX output buffer is coming from TVDD. Typical TVDD influence on

RF reading distance is depicted on the below picture:

Fig 8.

TVDD can be regulated by the TXLDO which will be powered internally by the PN7150.

The voltages choice will depend on the configuration used.

Please note that if the product has already been certified, changing one RF

parameter like TVDD setting must lead to a full re-certification.

The programming of the TVDD configuration is described in PN7150 User Manual [2].

The Low drop Out Regulator has been designed to generate a 3.0 V, 3.3 V or 3.6 V

supply voltage to a transmitter with a current load up to 180 mA.

The input supply voltage of this regulator is a battery voltage connected to VBAT1 pin.

AN11756

Application note

COMPANY PUBLIC

Typical reading distance vs TVDD using OM5578 board

All information provided in this document is subject to legal disclaimers.

Rev. 1.2 — 15 January 2018

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AN11756

PN7150 Hardware Design Guide

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