Shakespeare Electronic SE500 Spezifikationen PDF herunterladen (Seite 30)

CC1000

SWRS048A Page 30 of 55

Figure 19. Sequence for activating RX or TX mode

Turn on crystal oscillator core

MAIN: CORE_PD = 0

Wait 2 ms*

Turn on bias generator

BIAS_PD = 0

Wait 200 µs

Turn on RX:

MAIN: RXTX = 0, F_REG = 0

RX_PD = 0, FS_PD = 0

CURRENT = ‘RX current’

PLL = ’RX pll’

Wait 250 µs

RX or TX?

Power Down

*Time to wait depends on the crystal frequency

and the load capacitance

RX mode

Turn off RX:

MAIN: RX_PD = 1, FS_PD = 1,

CORE_PD=1, BIAS_PD=1

Power Down

Turn on TX:

PA_POW = 00h

MAIN: RXTX = 1, F_REG = 1

TX_PD = 0, FS_PD = 0

CURRENT = ‘TX current’

PLL = ’RX pll’

Wait 250 µs

TX mode

Turn off TX:

MAIN: TX_PD = 1, FS_PD = 1,

CORE_PD=1, BIAS_PD=1

PA_POW = 00h

Power Down

PA_POW = ‘Output power’

Wait 20 µs

RX TX

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