CC1100-RTR1 datasheet(49/100 Pages) TI1

49 / 100 page

CC1100

SWRS038D

Page 49 of 92

Voltage Regulators

CC1100 contains several on-chip linear voltage

regulators, which generate the supply voltage

needed

low-voltage

modules.

These

voltage regulators are invisible to the user, and

can be viewed as integral parts of the various

modules. The user must however make sure

that the absolute maximum ratings and

required pin voltages in Table 1 and Table 13

are not exceeded. The voltage regulator for

the

digital

core

requires

one

external

decoupling capacitor.

Setting the CSn pin low turns on the voltage

regulator to the digital core and starts the

crystal oscillator. The SO pin on the SPI

interface must go low before the first positive

edge of SCLK. (setup time is given in Table

16).

If the chip is programmed to enter power-down

mode, (SPWD strobe issued), the power will be

turned off after CSn goes high. The power and

crystal oscillator will be turned on again when

CSn goes low.

The voltage regulator output should only be

used for driving the

CC1100.

Output Power Programming

The RF output power level from the device

has

two

levels

programmability,

illustrated in Figure 22. Firstly, the special

PATABLE

selected output power settings. Secondly, the

3-bit FREND0.PA_POWER value selects the

PATABLE

entry to use. This two-level

functionality provides flexible PA power ramp

up and ramp down at the start and end of

transmission, as well as ASK modulation

shaping. All the PA power settings in the

PATABLE

from

index

the

FREND0.PA_POWER

value are used.

The power ramping at the start and at the end

of a packet can be turned off by setting

FREND0.PA_POWER

zero

and

then

program the desired output power to index 0 in

the PATABLE.

If OOK modulation is used, the logic 0 and

logic 1 power levels shall be programmed to

index 0 and 1 respectively.

Table 30 contains recommended PATABLE

settings

for

various

output

levels

and

frequency bands. Using PA settings from 0x61

to 0x6F is not recommended. See Section

10.6 on page 28 for PATABLE programming

details.

Table 31 contains output power and current

consumption for default PATABLE

setting

(0xC6). PATABLE must be programmed in

burst mode if you want to write to other entries

than PATABLE[0].

Note that all content of the PATABLE, except

for the first byte (index 0) is lost when entering

the SLEEP state.

315 MHz

433 MHz

868 MHz

915 MHz

Output

Power

[dBm]

Setting

Current

Consumption,

Typ. [mA]

Setting

Current

Consumption,

Typ. [mA]

Setting

Current

Consumption,

Typ. [mA]

Setting

Current

Consumption,

Typ. [mA]

-30

0x04

10.6

0x04

11.5

0x03

11.9

0x11

11.8

-20

0x17

11.1

0x17

12.1

0x0D

12.4

0x0D

12.3

-15

0x1D

11.8

0x1C

12.7

0x1C

13.0

0x1C

13.0

-10

0x26

13.0

0x26

14.0

0x34

14.5

0x26

14.3

-5

0x57

12.9

0x57

13.7

0x57

14.1

0x57

13.9

0x60

14.8

0x60

15.6

0x8E

16.9

0x8E

16.7

0x85

18.1

0x85

19.1

0x85

20.0

0x83

19.9

0xCB

22.1

0xC8

24.2

0xCC

25.8

0xC9

25.8

0xC2

27.1

0xC0

29.2

0xC3

31.1

0xC0

32.3

Table 30: Optimum PATABLE Settings for Various Output Power Levels and Frequency Bands

CC1100-RTR1 Datasheet(PDF) 49 Page - Texas Instruments

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