CC2500-RTY1 datasheet(66/84 Pages) TI

66 / 84 page

CC2500

PRELIMINARY Data Sheet (Rev.1.2)

SWRS040A

Page 66 of 83

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 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)

When going from RX or TX back to IDLE

3 (11)

Every 4

th time when going from RX or TX to IDLE

In some automatic wake-on-radio (WOR) applications, using

setting 3 (11) can significantly reduce current consumption.

3:2

PO_TIMEOUT

1 (01)

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 CHIP_RDYn goes low (PO_TIMEOUT =

2 recommended).

If XOSC is off during power-down, the regulated digital supply

voltage has time to stabilize while waiting for the crystal to be

stable and PO_TIMEOUT can be set to 0.

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.

PIN_CTRL_EN

R/W

Enables the pin radio control option

XOSC_FORCE_ON

R/W

Force the XOSC to stay on in the SLEEP state.

CC2500-RTY1 Datasheet(PDF) 66 Page - Texas Instruments

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