CC1110Fx / CC1111Fx
15 Voltage Regulators
The voltage regulator requires an external
decoupling capacitor connected to the DCOUPL
pin as described in section 10 on page 36.
The CC1110Fx/CC1111Fx includes a low drop-out
voltage regulator. This is used to provide a 1.8
V power supply to the CC1110Fx/CC1111Fx digital
power supply. The voltage regulator should not
be used to provide power to external circuits
because of limited power sourcing capability
and also due to noise considerations.
15.1 Voltage Regulator Power-on
The voltage regulator is disabled when the
CC1110Fx/CC1111Fx is placed in power modes
PM2 or PM3 (see section 13.1). When the
voltage regulator is disabled, register and RAM
contents will be retained while the unregulated
2.0 V - 3.6 V power supply is present.
The voltage regulator input pin AVDD_DREG is
to be connected to the unregulated 2.0 V to 3.6
V power supply. The output of the digital
regulator is connected internally in the
CC1110Fx/CC1111Fx to the digital power supply.
16 Radio Test Output Signals
For debug and test purposes, a number of
internal status signals in the radio may be
output on the port pins P1_7 – P1_5. This
debug option is controlled through the RF
registers IOCFG2-IOCFG0. Table 74 shows
the value written to IOCFGx.GDOx_CFG[5:0]
with the corresponding internal signals that will
be output in each case.
Setting IOCFGx.GDOx_CFG to a value other
than 0 will override the P1SEL_SELP1_7,
P1SEL_SELP1_6,
and
P1SEL_SELP1_5
settings, and the pins will automatically
become outputs.
GDO0_CFG[5:0]
GDO1_CFG[5:0]
GDO2_CFG[5:0]
Description
000000
The pin is configured according to the I/O registers. See 13.4.11
Reserved
000001 – 000111
001000
Preamble Quality Reached. Asserts when the PQI is above the programmed PQT value.
001001
Clear channel assessment. High when RSSI level is below threshold (dependent on the current
CCA_MODEsetting)
001010 – 001101
001110
Reserved
Carrier sense. High if RSSI level is above threshold.
001111
CRC_OK. The last CRC comparison matched. Cleared when entering/restarting RX mode.
010000 - 010101
010110
Reserved
RX_HARD_DATA[1]. Can be used together with RX_SYMBOL_TICK for alternative serial RX output.
RX_HARD_DATA[0]. Can be used together with RX_SYMBOL_TICK for alternative serial RX output.
Reserved
010111
011000 – 011010
011011
PA_PD. Can be used to control an external PA or RX/TX switch. Signal is asserted when the radio
enters TX state.
LNA_PD. Can be used to control an external LNA or RX/TX switch. Signal is asserted when the radio
enters RX state.
011100
011101
RX_SYMBOL_TICK. Can be used together with RX_HARD_DATA for alternative serial RX output.
Reserved
011110 - 101110
HW to 0 (HW1 achieved by setting GDOx_INV=1). Can be used to control an external LNA/PA or
RX/TX switch.
101111
110000 - 111111
Reserved
Table 74: Radio Test Output Signals
SWRS033E
Page 226 of 239
TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
