User Manual
Table Of Contents
- 1 Introduction
- 2 Features
- 3 Transceiver description
- 4 System and power management
- 5 Radio Peripherals
- 6 MKW2xDxxxV operating modes
- 7 MKW2xDxxxV electrical characteristics
- 8 MCU Electrical characteristics
- 8.1 Maximum ratings
- 8.2 General
- 8.3 LVD and POR operating requirements
- 8.4 Switching specification
- 8.5 Core modules
- 8.6 Clock modules
- 8.7 Memories and memory interfaces
- 8.8 Analog
- 8.9 Communication interfaces
- 8.9.1 USB electrical specifications
- 8.9.2 USB DCD electrical specifications
- 8.9.3 VREG electrical specifications
- 8.9.4 DSPI switching specifications (limited voltate range)
- 8.9.5 DSPI switching specification (full voltage range)
- 8.9.6 Normal Run, Wait and Stop mode performance over the fulloperating voltage range
- 8.9.7 VLPR, VLPW, and VLPS mode performance over the full operating voltage range
- 9 Transceiver electrical characteristics
- 10 Crystal oscillator reference frequency
- 11 Pin assignments
- 12 Packaging information
MKW2xDxxxV Product Electrical Specification, Rev. 0.1
8 Freescale Semiconductor
3.3.2 Transmit path
MKW2xDxxxV transmits OQPSK modulation having power and channel selection adjustment per user
application. After the channel of operation is determined, coarse and fine tuning is executed within the
Frac-N PLL to engage signal lock. After signal lock is established, the modulated buffered signal is then
routed to a multi-stage amplifier for transmission. The differential signals at the output of the PA
(RFOUTP, RFOUTN) are converted as single ended (SE) signals with off chip components as required.
3.3.3 Clear channel assessment (CCA), energy detection (ED), and link
quality indicator (LQI)
MKW2xDxxxV supports three clear channel assessment (CCA) modes of operation to include energy
detection (ED) and link quality indicator (LQI). Functionality for each of these modes is provided in the
sections that follow.
3.3.3.1 CCA mode 1
CCA mode 1 has two functions:
• To estimate the energy in the received baseband signal.This energy is estimated based on receiver
signal strength indicator (RSSI).
• To determine whether the energy is greater than a threshold.
The estimate of the energy can also be used as the Link Quality metric. In CCA Mode 1, MKW2xDxxxV
warms up from Idle to Receive mode where RSSI (Receiver Signal Strength Indicator) averaging takes
place right after 170µs of receiver warm-up.
3.3.3.2 CCA mode 2
CCA mode 2 detects whether there is any 802.15.4 signal transmitting at the frequency band that an
802.15.4 transmitter intends to transmit. From the definition of CCA mode 2 in the 802.15.4 standard, the
requirement is to detect an 802.15.4 complied signal. Whether the detected energy is strong or not is not
important for CCA mode 2.
3.3.3.3 CCA mode 3
CCA mode 3 as defined by 802.15.4 standard is implemented using a logical combination of CCA mode
1 and CCA mode 2. Specifically, CCA mode 3 operates in one of two operating modes:
• CCA mode 3 is asserted if both CCA mode 1 and CCA mode 2 are asserted.
• CCA mode 3 is asserted if either CCA mode 1 or CCA mode 2 is asserted.
This mode setting is available through a programmable register.