JN517X Datasheet, PDF (30/100 Pages) NXP Semiconductors – Supports multiple network stacks

NXP Semiconductors
JN517x
IEEE802.15.4 Wireless Microcontroller
The ED and LQI are both related to received power in the same way, as shown in
Figure 20. LQI is associated with a received packet, whereas ED is an indication of signal
power on-air at a particular moment.
The CCA capability of the modem supports all modes of operation defined in the
IEEE802.15.4 standard, namely Energy above ED threshold, Carrier Sense and Carrier
Sense and/or energy above ED threshold.
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120
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80
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40
20
0
-105
-85
-65
-45
-25
Fig 20. Energy detect value versus receive power level
aaa-023522
-5
15
input power (dBm)
9.7.3 Baseband processor
The baseband processor provides all time-critical functions of the IEEE802.15.4 MAC
layer. Dedicated hardware guarantees air interface timing is precise. The MAC layer
hardware/software partitioning enables software to implement the sequencing of events
required by the protocol and to schedule timed events with millisecond resolution and the
hardware to implement specific events with microsecond timing resolution. The protocol
software layer performs the higher-layer aspects of the protocol, sending management
and data messages between End Device and Co-ordinator nodes, using the services
provided by the baseband processor.
JN517X
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2.0 — 8 November 2016
© NXP Semiconductors N.V. 2016. All rights reserved.
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