CC1021-RTR1 datasheet(49/91 Pages) TI1

49 / 91 page

Not Recommended for New Designs NRND

CC1021

www.ti.com

SWRS045D – JANUARY 2006 – REVISED JANUARY 2015

5.13 VCO and LNA Current Control

The VCO current is programmable and should be set according to operating frequency, RX/TX mode and

output power. Recommended settings for the VCO_CURRENT bits in the VCO register are shown in

Table 5-16 and also given by SmartRF Studio. The VCO current for frequency FREQ_A and FREQ_B can

be programmed independently.

The bias currents for the LNA, mixer and the LO and PA buffers are also programmable. The FRONTEND

and the BUFF_CURRENT registers control these currents.

5.14 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 TX 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 5-27 shows a typical power-on and initializing sequence for

minimum power consumption.

Figure 5-28 shows a typical sequence for activating RX and TX mode from power down mode for

minimum power consumption.

NOTE

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 pullup resistor.

Application Note AN023 CC1020 MCU Interfacing (SWRA069) is also applicable for the CC1021 device

and includes example source code.

TI recommends resetting the CC1021 (by clearing the RESET_N bit in the MAIN register) when the chip is

powered up 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 5-26 through Figure 5-28.

NOTE

The CC1020 sub-routines are equally applicable for the CC1021.

With reference to Application Note AN023 CC1020 MCU Interfacing (SWRA069), TI recommends the

following sequence:

After power up:

1. ResetCC1020

2. Initialize

3. WakeUpCC1020ToRX

4. Calibrate

5. WakeUpCC1020ToTX

6. Calibrate

After calibration is completed, enter TX mode (SetupCC1020TX), RX mode (SetupCC1020RX) or power

down mode (SetupCC1020PD).

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CC1021-RTR1 Datasheet(PDF) 49 Page - Texas Instruments

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