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Sub 1 GHz Transceiver Architecture Description
MKW01xxRM Reference Manual, Rev. 3, 04/2016
Freescale Semiconductor, Inc.
5-23
Figure 5-11. Optimized AFC (AfcLowBetaOn=1)
As shown on
, a standard AFC sequence uses the result of the FEI to correct the LO frequency
and align both local oscillators. When the optimized AFC is enabled (
AfcLowBetaOn=1
), the receiver’s
LO is corrected by “
FeiValue
+
LowBetaAfcOffset
”.
When the optimized AFC routine is enabled, the receiver startup time can be computed as follows:
TS_RE_AGC&AFC (optimized AFC) =
Tana + 4*Tcf + 4*Tdcc + 3*Trssi + 2*Tafc + 2*Tpllafc
5.7.16
Temperature Sensor
When temperature is measured, the receiver ADC is used to digitize the sensor response. Most receiver
blocks are disabled, and temperature measurement can only be triggered in Standby or Frequency
Synthesizer modes.
The response of the temperature sensor is -1°C / Lsb. A CMOS temperature sensor is not accurate by
nature, therefore it should be calibrated at ambient temperature for precise temperature readings.
Figure 5-12. Temperature Sensor Response
f
TX
RX
f
RX
&
TX
Standard AFC
AfcLowBetaOn = 0
f
TX
RX
TX
RX
LowBetaAfcOffset
f
AfcValue
AfcValue
FeiValue
FeiValue
Optimized AFC
AfcLowBetaOn = 1
Before AFC
After AFC
-40
°
C
+85
°
C
TempValue
Ambient
Returns150d (typ.)
Needs calibration
t t+1
TempValue(t)
TempValue(t)-1
-1
°
C/ Lsb
Содержание MKW01Z128
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Страница 130: ...MKW01xxRM Reference Manual Rev 3 04 2016 Freescale Semiconductor Inc A 1 Appendix A MKW01Z128 MCU Reference Manual...
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