CC1021-RTR1 datasheet(54/92 Pages) TI

54 / 92 page

CC1021

SWRS045

Page 54 of 91

17.

Power Management

CC1021 offers great flexibility for power

management in order to meet strict power

consumption requirements in battery-

operated applications. Power down mode

is controlled through the MAIN register.

There are separate bits to control the RX

part,

the

part,

the

frequency

synthesizer and the crystal oscillator in the

MAIN register. This individual control can

be used to optimize for lowest possible

current consumption in each application.

Figure 30 shows a typical power-on and

initializing sequence for minimum power

consumption.

Figure 31 shows a typical sequence for

activating RX and TX mode from power

down

mode

for

minimum

power

consumption.

Note that PSEL should be tri-stated or set

to a high level during power down mode in

order to prevent a trickle current from

flowing in the internal pull-up resistor.

Application Note AN023 CC1020 MCU

Interfacing is also applicable for the

CC1021. This application note includes

example source code and is available from

the Chipcon web site.

Chipcon recommends resetting the CC1021

(by clearing the RESET_N bit in the MAIN

initially. All registers that need to be

configured should then be programmed

(those which differ from their default

values). Registers can be programmed

freely in any order. The CC1021 should

then be calibrated in both RX and TX

mode. After this is completed, the CC1021

is ready for use. See the detailed

procedure flowcharts in Figure 29 - Figure

31.

With reference to Application Note AN023

CC1020

MCU

Interfacing

Chipcon

recommends the following sequence. Note

that the CC1020 sub-routines are equally

applicable for the CC1021.

After power up:

1) ResetCC1020

2) Initialize

3) WakeUpCC1020ToRX

4) Calibrate

5) WakeUpCC1020ToTX

6) Calibrate

After calibration is completed, enter TX

mode

(SetupCC1020TX),

mode

(SetupCC1020RX) or power down mode

(SetupCC1020PD)

From power-down mode to RX:

1) WakeUpCC1020ToRX

2) SetupCC1020RX

From power-down mode to TX:

1) WakeUpCC1020ToTX

2) SetupCC1020TX

Switching from RX to TX mode:

1) SetupCC1020TX

Switching from TX to RX mode:

1) SetupCC1020RX

CC1021-RTR1 Datasheet(PDF) 54 Page - Texas Instruments

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