NXP Semiconductors
AN11744
PN5180 Evaluation board quick start guide
AN11744 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2018. All rights reserved.
Application note Rev. 1.3 — 2 February 2018
COMPANY PUBLIC 371213 35 / 45
1. LPCD has not been started yet.
Figure 30. PN5180 LPCD
Auto_Calibration: the LPCD calibration is done automatically when the LPCD is started,
using the gear and threshold as defined in the EEPROM. This mode always uses the
same gear for the LPCD, and is the fastest and easiest way to start the LPCD. It is
recommended to choose a gear, which always keeps the ITVDD and field strength limits,
so normally e.g. the highest available gear number.
Self_Calibration: The LPCD calibration must be manually triggered, with reading or
writing into the AGCREF_CONFIG register. The LPCD calibration can be done in two
different options:
Option 1: Read AGC_REF_CONFIG register: This command executes a standard RF
Field on. So, depending on the load condition the DPC adjusts the output power. The
final gear is take as gear for the LPCD. This option guarantees that the maximum output
power is taken for the LPCD.
Option 2: Write AGC_REF_CONFIG register: This command executes a LPCD
calibration ping with the gear number, as defined in the AGC_REF_CONFIG, bit 10..13.
This option allows a flexible use of any of the defined gears for the LPCD.
Enable GPO1 or GPO2 Control and Time: Refer to [1].
Standby time: This value defines the time between two pings in ms.
FieldOn Current: This value is the ITVDD under the loading condition, when RF field is
on with the used gear. This value does not have any influence on the LPCD execution
or performance as such, but simply is used to estimate the overall average current
consumption. This current estimation is calculated, when the LPCD is started.
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