CC1100-RTY1 datasheet(70/100 Pages) TI1

70 / 100 page

CC1100

SWRS038D

Page 70 of 92

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)

1 = Disable (current optimized). Only for data rates

≤ 250 kBaud

The recommended IF frequency changes when the DC blocking is

disabled. Please use SmartRF® Studio [7] to calculate correct register

setting.

6:4

MOD_FORMAT[2:0]

0 (000)

R/W

The modulation format of the radio signal

Setting

Modulation format

0 (000)

2-FSK

1 (001)

GFSK

2 (010)

3 (011)

ASK/OOK

4 (100)

5 (101)

6 (110)

7 (111)

MSK

ASK is only supported for output powers up to -1 dBm

MSK is only supported for datarates above 26 kBaud

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 (010), 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

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