CC1070-RTY1 datasheet(34/57 Pages) TI

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CC1070

SWRS043

Page 34 of 58

Power Down mode

*Time to wait depends

on the crystal frequency

and the load capacitance

TX mode

Power Down mode

Turn on frequency synthesizer

MAIN: F_REG=1, FS_PD=0

Wait until lock is detected from LOCK

pin or STATUS register

Turn off TX:

MAIN: PD_MODE = 1, FS_PD=1,

XOSC_PD=1, BIAS_PD=1

Turn on TX:

MAIN: PD_MODE = 0

Wait 100

µs then set PA_POWER

Turn on bias generator

MAIN: BIAS_PD = 0

Wait 150

µs

Turn on crystal oscillator core

MAIN: PD_MODE=1, FS_PD=1,

XOSC_PD=0, BIAS_PD=1

PA_POWER: 00h

Wait 1.2 ms*

Set PA_POWER = 00h

Wait 100

µs

Power Down mode

*Time to wait depends

on the crystal frequency

and the load capacitance

TX mode

Power Down mode

Turn on frequency synthesizer

MAIN: F_REG=1, FS_PD=0

Wait until lock is detected from LOCK

pin or STATUS register

Turn off TX:

MAIN: PD_MODE = 1, FS_PD=1,

XOSC_PD=1, BIAS_PD=1

Turn on TX:

MAIN: PD_MODE = 0

Wait 100

µs then set PA_POWER

Turn on bias generator

MAIN: BIAS_PD = 0

Wait 150

µs

Turn on crystal oscillator core

MAIN: PD_MODE=1, FS_PD=1,

XOSC_PD=0, BIAS_PD=1

PA_POWER: 00h

Wait 1.2 ms*

Set PA_POWER = 00h

Wait 100

µs

Figure 19. Sequence for activating TX mode

17 Crystal Oscillator

Any crystal frequency in the range 4 - 20

MHz can be used. The crystal frequency is

used as reference for the data rate (as

well as other internal functions) and in the

4 – 20 MHz range the frequencies 4.9152,

7.3728,

9.8304,

12.2880,

14.7456,

17.2032, 19.6608 MHz will give accurate

data rates as shown in Table 14. The

crystal

frequency

will

influence

the

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