CC1150-RTR1 datasheet(23/67 Pages) TI

23 / 67 page

CC1150

SWRS037A

Page 23 of 60

11.3

Optional Radio Control Feature

The

CC1150 has an optional way of controlling

the radio by reusing SI, SCLK, and CSn from

the SPI interface. This feature allows for a

simple three-pin control of the major states of

the radio: SLEEP, IDLE, and TX.

This optional functionality is enabled with the

MCSM0.PIN_CTRL_EN

configuration bit.

State changes are commanded as follows:

• If CSn is high, the SI and SCLK are set to

the desired state according to Table 17.

• If CSn goes low, the state of SI and SCLK

is latched and a command strobe is

generated internally according to the pin

configuration.

It is only possible to change state with the

latter functionality. That means that for

instance TX will not be restarted if SI and

SCLK are set to TX and CSn toggles. When

CSn is low the SI and SCLK has normal SPI

functionality.

All pin control command strobes are executed

immediately except the SPWD strobe. The

SPWD

strobe is delayed until CSn goes high.

CSn

SCLK

Function

Chip unaffected by SCLK/SI

↓

Generates SPWD strobe

↓

Generates STX strobe

↓

Generates SIDLE strobe

↓

Defined on the transceiver

version (

CC1101)

SPI

mode

SPI

mode

SPI mode (wakes up into

IDLE if in SLEEP/XOFF)

Table 17: Optional Pin Control Coding

12 Data Rate Programming

The data rate used when transmitting is

programmed by the MDMCFG3.DRATE_M and

the

MDMCFG4.DRATE_E

configuration

registers. The data rate is given by the formula

below. As the formula shows, the programmed

data rate depends on the crystal frequency.

()

XOSC

DRATE

DATA

DRATE

⋅

256

The following approach can be used to find

suitable values for a given data rate:

256

log

−

⋅

⎥

⎦

⎥

⎢

⎣

⎢

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

⋅

DRATE

XOSC

DATA

XOSC

DATA

DRATE

If DRATE_M is rounded to the nearest integer

and becomes 256, increment DRATE_E and

use DRATE_M=0.

The data rate can be set from 0.8 kBaud to

500 kBaud with the minimum data rate step

size changes according to Table 18 below.

Min Data

rate

[kBaud]

Typical data

rate

[kBaud]

Max Data

rate

[kBaud]

Data rate

step size

[kBaud]

0.8

1.2 / 2.4

3.17

0.0062

3.17

4.8

6.35

0.0124

6.35

9.6

12.7

0.0248

12.7

19.6

25.4

0.0496

25.4

38.4

50.8

0.0992

50.8

76.8

101.6

0.1984

101.6

153.6

203.1

0.3967

203.1

250

406.3

0.7935

406.3

500

1.5869

Table 18: Data Rate Step Size

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