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
µ
s
Turn on RX:
MAIN: RXTX = 0, F_REG = 0
RX_PD = 0, FS_PD = 0
CURRENT = ‘RX current’
PLL = ’RX pll’
Wait 250
µ
s
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
µ
s
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
µ
s
RX
TX
