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42 / 92 page  JN5189 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved. Product data sheet Rev. 1.2 — June 2020 42 of 92 NXP Semiconductors IEEE 802.15.4 low power wireless MCU JN5189(T)/JN5188(T) 8.20.2 Modem The modem performs all the necessary modulation and spreading functions required for digital transmission and reception of data at 250 kbits/s in the 2.4 GHz radio frequency band in compliance with the IEEE802.15.4 standard. Features provided to support network channel selection algorithms include Energy Detection (ED), Link Quality Indication (LQI) and fully programmable Clear Channel Assessment (CCA). The modem provides a digital Receive Signal Strength Indication (RSSI) that facilitates the implementation of the IEEE802.15.4 ED function and LQI function. The ED and LQI are both related to receiver power. 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. 8.20.3 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. Fig 6. Modem system diagram VCO Spreading Modulation Sigma-delta modulator TX data interface TX gain Symbol Detection (Despreading) Demodulation IF signal RX data interface RX AGC Data Conditioning |
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