CC2500-RTY1 datasheet(61/84 Pages) TI

61 / 84 page

CC2500

PRELIMINARY Data Sheet (Rev.1.2)

SWRS040A

Page 61 of 83

0x12: MDMCFG2 – Modem configuration

Bit

Field Name

Reset

R/W

Description

DEM_DCFILT_OFF

R/W

Disable digital DC blocking filter before demodulator.

0 = Enable (better sensitivity for data rates ≤ 250 kbps)

1 = Disable (current optimized)

The recommended IF frequency changes when the DC

blocking is disabled.

6:4

MOD_FORMAT[2:0]

0 (000)

R/W

The modulation format of the radio signal

Setting

Modulation format

0 (000)

FSK

1 (001)

GFSK

2 (010)

3 (011)

OOK

4 (100)

5 (101)

6 (110)

7 (111)

MSK

MANCHESTER_EN

R/W

Enables Manchester encoding/decoding.

0 = Disable

1 = Enable

2:0

SYNC_MODE[2:0]

2 (010)

R/W

Combined sync-word qualifier mode.

The values 0 (000) and 4 (100) disables preamble and

sync word transmission in TX and preamble and sync

word detection in RX.

The values 1 (001), 2 (001), 5 (101) and 6 (110)

enables 16-bit sync word transmission in TX and 16-

bits sync word detection in RX. Only 15 of 16 bits need

to match in RX when using setting 1 (001) or 5 (101).

The values 3 (011) and 7 (111) enables repeated sync

word transmission in TX and 32-bits sync word

detection in RX (only 30 of 32 bits need to match).

Setting

Sync-word qualifier mode

0 (000)

No preamble/sync

1 (001)

15/16 sync word bits detected

2 (010)

16/16 sync word bits detected

3 (011)

30/32 sync word bits detected

4 (100)

No preamble/sync, carrier-sense

above threshold

5 (101)

15/16 + carrier-sense above threshold

6 (110)

16/16 + carrier-sense above threshold

7 (111)

30/32 + carrier-sense above threshold

CC2500-RTY1 Datasheet(PDF) 61 Page - Texas Instruments

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