CC1021-RTR1 datasheet(37/91 Pages) TI1

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CC1021

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SWRS045D – JANUARY 2006 – REVISED JANUARY 2015

5.9.12 Automatic Power-Up Sequencing

CC1021 has a built-in automatic power-up sequencing state machine. By setting the CC1021 into this

mode, the receiver can be powered-up automatically by a wake-up signal and will then check for a carrier

signal (carrier sense). If carrier sense is not detected, it returns to power-down mode. A flow chart for

automatic power-up sequencing is shown in Figure 5-18.

The automatic power-up sequencing mode is selected when PD_MODE[1:0] = 11 in the MAIN register.

When the automatic power-up sequencing mode is selected, the functionality of the MAIN register is

changed and used to control the sequencing.

By setting SEQ_PD = 1 in the MAIN register, CC1021 is set in power down mode. If SEQ_PSEL = 1 in the

SEQUENCING register the automatic power-up sequence is initiated by a negative transition on the PSEL

pin.

If SEQ_PSEL = 0 in the SEQUENCING register, then the automatic power-up sequence is initiated by a

negative transition on the DIO pin (as long as SEP_DI_DO = 1 in the INTERFACE register).

Sequence timing is controlled through RX_WAIT[2:0] and CS_WAIT[3:0] in the SEQUENCING register.

VCO and PLL calibration can also be done automatically as a part of the sequence. This is controlled

through SEQ_CAL[1:0] in the MAIN register. Calibration can be done every time, every 16th sequence,

every 256th sequence, or never. See the register description for details. A description of when to do, and

how the VCO and PLL self-calibration is done, is given in Section 5.12.2.

See also Application Note AN070 CC1020 Automatic Power-Up Sequencing (SWRA279).

Detailed Description

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CC1021-RTR1 Datasheet(PDF) 37 Page - Texas Instruments