MRF39RA Datasheet, PDF (55/72 Pages) Microchip Technology – Low-Power, Integrated UHF Receiver

MRF39RA
5.6 Temperature Sensor Registers
TABLE 5-6:
Name
(Address)
RegTemp1
(0x4E)
RegTemp2
(0x4F)
TEMPERATURE SENSOR REGISTERS
Bits
Variable Name
Mode
Default
Value
Description
7-4 —
3 TempMeasStart
2 TempMeasRunning
1-0 —
7-0 TempValue
r
0000 Unused
w
0 Triggers the temperature measurement
when set. Always reads ‘0’.
r
0 Set to ‘1’ while the temperature measure-
ment is running. Toggles back to ‘0’ when
the measurement is completed. The
receiver cannot be used while measuring
temperature
r
01 Unused
r
— Measured temperature
-1°C per Lsb
Needs calibration for accuracy
5.7 Test Registers
TABLE 5-7:
Name
(Address)
RegTestLna
(0x58)
TEST REGISTERS
Bits
Variable Name
7-0 SensitivityBoost
RegTestTcxo
(0x59)
7-5 Reserved
4 TcxoInputOn
RegTestPIIBW
(0x5F)
3-0 Reserved
3-2 PIIBW
RegTestDagc
(0x6F)
7-0 ContinuousDagc
RegTestAfc
(0x71)
7-0 LowBetaAfcOffset
Mode
rw
rw
rw
rw
rw
rw
rw
Default
Value
Description
0x1B
0x00
0x00
0x09
0x02
0x30
*
0x00
High Sensitivity or Normal Sensitivity mode:
0x1B  Normal mode
0x2D  High Sensitivity mode
Reserved
Controls the crystal oscillator
0  Crystal oscillator with external crystal
1  External clipped sine TCXO ac
coupled to XTA pin
Reserved
PLL 3 dB BW setting
0x00 75 kHz
0x01 150 kHz
0x10 300 kHz
0x11 600 kHz
Fading Margin Improvement (see
Section 2.4.3 “Continuous-Time DAGC”).
0x00  Normal mode
0x20  Improved margin, use if
AfcLowBetaOn=1
0x30  Improved margin, use if
AfcLowBetaOn=0
AFC offset set for low modulation index
systems, used if AfcLowBetaOn = 1.
Offset = LowBetaAfcOffset x 488 Hz
 2015 Microchip Technology Inc.
DS40001778B-page 55