Texas Instruments CC112 Series, User Manual, Page: 20 / 109

CC112X/CC1175
SWRU295C Page 20 of 108
13 RSSI_VALID RSSI calculation is valid
14 RSSI Signals
3 RSSI_UPDATE A pulse occurring each time the RSSI value is updated ( see Figure 14)
2 RSSI_UPDATE A pulse occurring each time the RSSI value is updated ( see Figure 14)
1 AGC_HOLD
AGC waits for gain settling
(
see Figure 14)
0 AGC_UPDATE A pulse occurring each time the front end gain has been adjusted
(
see Figure 14)
15 Clear channel assessment
3 CCA_STATUS Current CCA status
2 TXONCCA_DONE A pulse occurring when a decision has been made as to whether the
channel is busy or not. This signal must be used as an interrupt to the
MCU. When this signal is asserted/de-asserted,
TXONCCA_FAILED
can
be checked
1 CCA_STATUS Current CCA status
0 TXONCCA_FAILED TX on CCA failed
16 CARRIER_SENSE_VALID
CARRIER_SENSE
is valid
(
see Figure 14)
17 CARRIER_SENSE Carrier sense. High if RSSI level is above threshold (see section 5.8.1)
(
see Figure 14)
18 DSSS signals for DSSS repeat mode (RX).
MODCFG_DEV_E.MODEM_MODE = 01b
3 DSSS_CLK DSSS clock (see Section 4.1.6 for more details)
2 DSSS_DATA0 DSSS data0 (see Section 4.1.6 for more details)
1 DSSS_CLK DSSS clock (see Section 4.1.6 for more details)
0 DSSS_DATA1 DSSS data1 (see Section 4.1.6 for more details)
19 PKT_CRC_OK Asserted in RX when
PKT_CFG1.CRC_CFG = 01b or 10b
and a good
packet is received. This signal is always on if the radio is in TX or if the
radio is in RX and
PKT_CFG1.CRC_CFG = 00b
. The signal is de-
asserted when RX mode is entered and
PKT_CFG1.CRC_CFG ≠ 00b
20 MARC_MCU_WAKEUP
MCU wake up signal. Read
MARC_STATUS1.MARC_STATUS_OUT
to find
the cause of the wake up event (see Section 3.4.1.2 for more details)
21 SYNC_LOW0_HIGH1
DualSync Detect. Only valid when
SYNC_CFG0.SYNC_MODE = 111b
.
When
SYNC_EVENT
is asserted this bit can be checked to see which
sync word is found
22 Reserved (used for test)
23 LNA_PA_REG_PD Common regulator control for PA and LNA. Indicates RF operation
24 LNA_PD Control external LNA
2
25 PA_PD Control external PA
2
26 RX0TX1_CFG Indicates whether RF operation is in RX or TX (this signal is 0 in IDLE
state)
27 Reserved (used for test)
28 IMAGE_FOUND Image detected by image rejection calibration algorithm
29 CLKEN_SOFT Data clock for demodulator soft data (see Section 4.1.4 for more details)
30 SOFT_TX_DATA_CLK Data clock for modulator soft data (see Section 4.1.4 for more details)
31 - 32 Reserved (used for test)
2
This signal is active low. To control an external LNA, PA, or RX/TX switch in applications where the
SLEEP state is used it is therefore recommended to map this signal to GDO3 as this signal will be
hardwired to 1(0) in the SLEEP state.