CC1070-RTY1 datasheet(34/57 Pages) TI2

34 / 57 page

CC1070

SWRS043A

Page 34 of 54

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

programming of the CLOCK_A, CLOCK_B

and MODEM registers.

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