RF02
d2
d1
d0
Clock Output
Frequency [MHz]
The resulting output frequency can be calculated as:
fout = f0 – (-1)SIGN * (M + 1) * (30 kHz)
where:
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
1
1.25
1.66
2
f0 is the channel center frequency (see the next
command)
M is the three bit binary number <m2 : m0>
SIGN = (ms) XOR (FSK input)
Note:
2.5
3.33
5
• Use M in a range from 0 to 6.
10
2. Power Management Command
bit 15 14 13 12 11 10
9
0
8
0
7
6
5
4
3
2
1
0
POR
1
1
0
0
0
0
a1 a0 ex es ea eb et dc C000h
Bits 5-0, enable the corresponding block of the transmitters, i.e. the crystal oscillator is enabled by
the ex bit, the synthesizer by es, the power amplifier by ea and the low battery detector by eb, while the
wake-up timer by et. The bit dc disables the clock output buffer.
When receiving the Data Transmit Command, the chip supports automatic on/off control over the
crystal oscillator, the PLL and the PA.
If bit a1 is set, the crystal oscillator and the synthesizer are controlled automatically. Data Transmit
Command starts up the crystal oscillator and as soon as a stable reference frequency is available the
synthesizer starts. After a subsequent delay to allow locking of the PLL, if a0 is set the power amplifier is
turned on as well.
Note:
To enable the automatic internal control of the crystal oscillator, the synthesizer and the power
amplifier, the corresponding bits (ex, es, ea) must be zero in the Power Management Command.
The ex bit should be set in the Power Management Command for the correct control of es and ea.
The oscillator can be switched off by clearing the ex bit after the transmission.
The Sleep Command can be used to indicate the end of the data transmission process.
For processing the events caused by the peripheral blocks (POR, LBD or wake-up timer) the chip
requires operation of the crystal oscillator. This operation is fully controlled internally, independently from
the status of the ex bit, but if the dc bit is zero, the oscillator remains active until Sleep Command is
issued. (This command can be considered as an event controller reset.)
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