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18. VCO and LNA current control
The VCO current is programmable and
should be set according to operating
frequency RX/TX mode and output power.
Recommended
settings
VCO_CURRENT bits in the CURRENT
register are shown in the tables on page
41.
RF freq-
Current
uency
consumption
[MHz]
[mA]
433
9.3
433
7.4
868
11.8
868
9.6
Note: Current consumption and sensitivity are typical figures at 2.4 kBaud Manchester encoded data, BER 10
Table 10. Receiver sensitivity as function of current consumption
19. Power management
CC1000
offers great flexibility for power
management in order to meet strict power
consumption
requirements
operated applications. Power Down mode
is controlled through the MAIN register.
There are separate bits to control the RX
part,
the
TX
part,
synthesiser and the crystal oscillator (see
page 39). This individual control can be
used to optimise for lowest possible
current
consumption
application.
for
the
Sensitivity
CURRENT register
[dBm]
VCO_
CURRENT
[3:0]
-110
0100
-109
0100
-107
1000
-105
1000
in
battery
the
frequency
in
a
certain
SWRS048A
The bias current for the LNA, and the LO
and PA buffers are also programmable.
Table 10 shows the current consumption
and
receiver
sensitivity
settings (2.4 kBaud Manchester encoded
data).
LO_DRIVE
PA_DRIVE
[1:0]
[1:0]
01
00
00
00
11
00
10
00
A
typical
power-on
sequence
for
consumption is shown in Figure 18 and
Figure 19.
PALE should be tri-stated or set to a high
level during power down mode in order to
prevent a trickle current from flowing in the
internal pull-up resistor.
PA_POW should be set to 00h before
power down mode to ensure lowest
possible leakage current.
CC1000
for
different
FRONT_END register
BUF_CUR
LNA_CUR
RENT
RENT[1:0]
0
10
0
00
1
10
0
00
-3
and
initialising
minimum
power
Page 28 of 55
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