CC1010-RTY1 datasheet(89/150 Pages) TI2

89 / 150 page

CC1010

SWRS047A

Page 89 of 146

17.5 RF Transceiver RX/TX control and power management

The

RFMAIN

controls

the

operation mode (RX or TX), use of the

dual

frequency

registers

and

several

power down modes. In this way the

CC1010

offers

great

flexibility

for

power

management in order to meet strict power

consumption

requirements

battery-

operated applications. Different power-

down

modes

are

controlled

through

individual bits in the RFMAIN register.

There are separate bits to control the RX

part,

the

part,

the

frequency

synthesiser and the crystal oscillator. This

individual control can be used to optimise

for lowest possible current consumption in

a certain application.

A typical power-on sequence for minimum

power consumption is shown in Figure 22.

The figure assumes that frequency A is

used for RX and frequency B is used for

TX. If this is not the case, simply invert the

F_REG

setting.

RFMAIN (0xC8) - RF Main Control Register

Bit

Name

R/W

Reset value

Description

RXTX

R/W

RX/TX Switch.

0 : RX

1 : TX

F_REG

R/W

Select the frequency registers A or B

0 : Select frequency registers A

1 : Select frequency registers B

RX_PD

R/W

Select power down for the LNA, mixer, IF filter and digital

demodulator.

0 : Power up

1 : Power down

TX_PD

R/W

Select power down of the digital modem and PA.

0 : Power up

1 : Power down

FS_PD

R/W

Select power down of the frequency synthesizer

0 : Power up

1 : Power down

CORE_PD

R/W

Power down of main crystal oscillator core.

0 : Power up

1 : Power down

BIAS_PD

R/W

Power down of bias current generator and crystal

oscillator buffer.

0 : Power up

1 : Power down

Reserved, read as 0

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