CC1150-RTR1 datasheet(52/67 Pages) TI

52 / 67 page

CC1150

SWRS037A

Page 52 of 60

0x18: MCSM0 – Main Radio Control State Machine configuration

Bit

Field Name

Reset

R/W

Description

7:6

Not Used.

5:4

FS_AUTOCAL[1:0]

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

R/W

Programs the number of times the six-bit ripple counter must expire

after XOSC has stabilized before CHP_RDY_N goes low.

The XOSC is off during power-down and if 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 µs – 2.7 µs

1 (01)

Approx. 37 µs – 43 µs

2 (10)

Approx. 146 µs – 171 µs

3 (11)

256

Approx. 585 µs – 683 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 on the transceiver version (

CC1101)

0x22: FREND0 – Front end TX configuration

Bit

Field Name

Reset

R/W

Description

7:6

Not Used.

5:4

LODIV_BUF_

CURRENT_TX[1:0]

R/W

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

Not Used.

2:0

PA_POWER[2:0]

R/W

Selects PA power setting. This value is an index to the PATABLE,

which can be programmed with up to 8 different PA settings. In

ASK mode, this selects the PATABLE index to use when

transmitting a ‘1’. PATABLE index zero is used in ASK when

transmitting a ‘0’. The PATABLE settings from index ‘0’ to the

PA_POWER value are used for ASK TX shaping, and for power

ramp-up/ramp-down at the start/end of transmission in all TX

modulation formats.

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