CC2500-RTY1 datasheet(70/99 Pages) TI1

70 / 99 page

CC2500

SWRS040C

Page 70 of 89

0x16: MCSM2 – Main Radio Control State Machine Configuration

Bit

Field Name

Reset

R/W

Description

7:5

Reserved

RX_TIME_RSSI

R/W

Direct RX termination based on RSSI measurement (carrier

sense).

RX_TIME_QUAL

R/W

When the RX_TIME timer expires the chip stays in RX mode if

sync word is found when RX_TIME_QUAL=0, or either sync

word is found or PQT is set when RX_TIME_QUAL=1.

2:0

RX_TIME[2:0]

7 (111)

R/W

Timeout for sync word search in RX for both WOR mode and

normal RX operation. The timeout is relative to the

programmed EVENT0 timeout.

The RX timeout in µs is given by EVENT0·C(RX_TIME, WOR_RES) ·26/X, where C is given by the table below and

X is the crystal oscillator frequency in MHz:

RX_TIME[2:0]

WOR_RES = 0

WOR_RES = 1

WOR_RES = 2

WOR_RES = 3

0 (000)

3.6058

18.0288

32.4519

46.8750

1 (001)

1.8029

9.0144

16.2260

23.4375

2 (010)

0.9014

4.5072

8.1130

11.7188

3 (011)

0.4507

2.2536

4.0565

5.8594

4 (100)

0.2254

1.1268

2.0282

2.9297

5 (101)

0.1127

0.5634

1.0141

1.4648

6 (110)

0.0563

0.2817

0.5071

0.7324

7 (111)

Until end of packet

As an example, EVENT0=34666, WOR_RES=0 and RX_TIME=6 corresponds to 1.95 ms RX timeout, 1 s polling

interval and 0.195% duty cycle. Note that WOR_RES should be 0 or 1 when using WOR because using

WOR_RES > 1 will give a very low duty cycle. In applications where WOR is not used all settings of WOR_RES

can be used.

The duty cycle using WOR is approximated by:

RX_TIME[2:0]

WOR_RES = 0

WOR_RES = 1

0 (000)

12.50%

1.95%

1 (001)

6.250%

9765 ppm

2 (010)

3.125%

4883 ppm

3 (011)

1.563%

2441 ppm

4 (100)

0.781%

5 (101)

0.391%

6 (110)

0.195%

7 (111)

Note that the RC oscillator must be enabled in order to use setting 0-6, because the timeout counts RC oscillator

periods. WOR mode does not need to be enabled.

The timeout counter resolution is limited: With RX_TIME=0, the timeout count is given by the 13 MSBs of EVENT0,

decreasing to the 7 MSBs of EVENT0 with RX_TIME=6.

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