Texas Instruments CC112 Series, User Manual, Page: 66 / 109

CC112X/CC1175
SWRU295C Page 66 of 108
CC112X
has one manual calibration option (using the
SCAL
strobe), and three automatic calibration
options that are controlled by the
SETTLING_CFG.FS_AUTOCAL
setting:
Calibrate when going from IDLE to either RX or TX (or FSTXON)
Calibrate when going from either RX or TX to IDLE automatically
Calibrate every fourth time when going from either RX or TX to IDLE automatically
If the radio goes from TX or RX to IDLE by issuing an
SIDLE
strobe, calibration will not be performed.
8.14.1 CC1125 Category 1 Operation under EN 300 220
In order to meet EN 300 220 [2] Category 1 adjacent channel selectivity requirements
FS_CHP.CHP_CAL_CURR
must be altered after calibration as shown in Figure 32.
Figure 32: CC1125 Category 1
8.15 FS Out of Lock Detection
To check whether the PLL is out of lock, the user can enable the lock detector through the
FS_LOCK_EN
bit in the
FS_CFG
register. The lock indication can be read through the
FSCAL_CTRL.LOCK
register. The state of the
LOCK
signal is only valid in RX, TX, and FSTXON state.
Note: The calibration values are maintained in SLEEP mode, so the calibration is still valid
after waking up from SLEEP mode unless supply voltage or temperature has changed
significantly.
cc112xSpiReadReg(CC112X_FS_CHP, &temp, 1);
temp += 0x0C;
cc112xSpiWriteReg(CC112X_FS_CHP, &temp, 1);