CC2500RGPR Datasheet, PDF (72/99 Pages) Texas Instruments – Low-Cost Low-Power 2.4 GHz RF Transceiver

CC2500
0x18: MCSM0 – Main Radio Control State Machine Configuration
Bit Field Name
Reset
R/W Description
7:6 Reserved
5:4 FS_AUTOCAL[1:0]
3:2 PO_TIMEOUT
1 PIN_CTRL_EN
0 XOSC_FORCE_ON
0 (00)
1 (01)
0
0
R0
R/W Automatically calibrate when going to RX or TX, or back to IDLE
Setting When to perform automatic calibration
0 (00) Never (manually calibrate using SCAL strobe)
1 (01) When going from IDLE to RX or TX (or FSTXON)
2 (10)
3 (11)
When going from RX or TX back to IDLE
automatically
Every 4^th time when going from RX or TX to IDLE
automatically
In some automatic wake-on-radio (WOR) applications, using
setting 3 (11) can significantly reduce current consumption.
R/W Programs the number of times the six-bit ripple counter must
expire after XOSC has stabilized before CHP_RDYn goes low.
If XOSC is on (stable) during power-down, PO_TIMEOUT
should be set so that the regulated digital supply voltage has
time to stabilize before CHP_RDYn goes low (PO_TIMEOUT=2
recommended). Typical start-up time for the voltage regulator is
50 us.
If XOSC is off during power-down and the regulated digital
supply voltage has sufficient time to stabilize while waiting for
the crystal to be stable, PO_TIMEOUT can be set to 0. For
robust operation it is recommended to use PO_TIMEOUT=2.
Setting Expire count Timeout after XOSC start
0 (00) 1
Approx. 2.3 – 2.4 μs
1 (01) 16
Approx. 37 – 39 μs
2 (10) 64
Approx. 149 – 155 μs
3 (11) 256
Approx. 597 – 620 μs
Exact timeout depends on crystal frequency.
R/W Enables the pin radio control option
R/W Force the XOSC to stay on in the SLEEP state.
SWRS040C
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