CC2550-RTY1 datasheet(47/62 Pages) TI2

47 / 62 page

CC2550

SWRS039B

Page 47 of 58

0x18: MCSM0 – Main Radio Control State Machine Configuration

Bit

Field Name

Reset

R/W

Description

7:6

Reserved

5:4

FS_AUTOCAL[1:0]

0 (00)

R/W

Automatically calibrate when going to 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 TX (or FSTXON)

2 (10)

When going from TX back to IDLE

3 (11)

Every 4

th time when going from TX to IDLE

3:2

PO_TIMEOUT

2 (10)

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)

Approx. 2.3 – 2.4 µs

1 (01)

Approx. 37 – 39 µs

2 (10)

Approx. 149 – 155 µs

3 (11)

256

Approx. 597 – 620 µs

Exact timeout depends on crystal frequency.

In order to reduce start up time from the SLEEP state, this field is

preserved in powerdown (SLEEP state).

1:0

Reserved

Defined in the transceiver version

0x22: FREND0 – Front End TX Configuration

Bit

Field Name

Reset

R/W

Description

7:6

Reserved

5:4

LODIV_BUF_CURRENT_TX[1:0]

1 (01)

R/W

Adjusts current TX LO buffer (input to PA). The

value to use in this field is given by the SmartRF®

Studio software [4].

Reserved

2:0

PA_POWER[2:0]

0 (000)

R/W

Selects PA power setting. This value is an index to

the PATABLE. In OOK mode, this selects the

PATABLE index to use when transmitting a ‘1’.

PATABLE index zero is used in OOK when

transmitting a ‘0’.

CC2550-RTY1 数据表(PDF) 47 Page - Texas Instruments

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CC2550-RTY1 数据表(PDF) 47 Page - Texas Instruments

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