Sub 1 GHz Transceiver Architecture Description
MKW01xxRM Reference Manual, Rev. 3, 04/2016
5-24
Freescale Semiconductor, Inc.
It takes less than 100 microseconds for the transceiver to evaluate the temperature (from setting
TempMeasStart
to 1 to
TempMeasRunning
reset).
5.7.17
Timeout Function
The MKW01Z128 includes a Timeout function, which allows it to automatically shut-down the receiver
after a receive sequence and therefore save energy.
•
Timeout interrupt is generated
TimeoutRxStart * 8 * Tbit
after switching to RX mode if
RssiThreshold
flag does not raise within this time frame
•
Timeout interrupt is generated
TimeoutRssiThresh * 8 * Tbit
after
RssiThreshold
flag has been
raised.
This timeout interrupt can be used to warn the MCU to shut down the receiver and return to a lower power
mode.
5.8
High Bit Rate Operations
High Bit rate operation is available in FSK mode. For operations in high bit rate, the frequency deviation
should respect thefollowing equation: FDA + BRF/2 =<500kHz, where FDA is the Frequency Deviation
and BR is the Bit Rate.
5.8.1
500 kbps Operation
For operation at 500 kbps, the following settings are recommended:
•
FDA = 250kHz, where FDA is the Frequency Deviation (FSK operation with a Modulation index
of 1)
•
Crystal should be selected for a maximum of +/- 20ppm frequency stability.
•
Carrier frequency of the receiver should be programmed with 50kHz offset from the programmed
carrier frequency of transmitter. This offset takes into account the po/-20ppm drifts of
Crystals. No AFC is needed.
5.8.2
600 kbps Operation
For operation at 600kbps, the following settings are recommended:
•
FDA = 150kHz, where FDA is the Frequency Deviation (FSK operation with a Modulation index
of 0.5)
•
Crystal should be selected for a maximum of +/- 15ppm frequency stability.
•
Carrier frequency of the receiver should be programmed with 40kHz offset from the programmed
carrier frequency of transmitter. This offset takes into account the po/-15ppm drifts of
Crystals. No AFC is needed.
NOTE
For both 500 and 600 kbps operations, RegTestPll must be set to 0x0C.
Содержание MKW01Z128
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