AX8052F131 Datasheet, PDF (39/46 Pages) ON Semiconductor – SoC Ultra-Low Power RF-Microcontroller

Transmitter 39
6.6. PWRMODE Register
The AX8052F131 transmitter features its own independent power management, independent
from the microcontroller. While the microcontroller power mode is controlled through the PCON
register, the AX5031_PWRMODE register controls which parts of the transmitter are operating.
AX5031_PWRMODE
register
Name
Description
0000
0100
0101
1100
1101
POWERDOWN
VREGON
STANDBY
SYNTHTX
FULLTX
All digital and analog transmitter functions, except the register file, are
disabled. VREG is reduced to conserve leakage power. The registers
are still accessible.
All digital and analog transmitter functions, except the register file, are
disabled. VREG, however is at its nominal value for operation, and all
registers are accessible.
The crystal oscillator is powered on; the transmitter is off.
The synthesizer is running on the transmit frequency. The transmitter
is still off. This mode is used to let the synthesizer settle on the correct
frequency for transmit.
Synthesizer and transmitter are running. Do not switch into this mode
before the synthesizer has completely settled on the transmit
frequency (in SYNTHTX mode), otherwise spurious spectral
transmissions will occur.
A typical AX5031_PWRMODE sequence for a transmit session:
Step PWRMODE[3:0] Remarks
1
POWERDOWN
2
STANDBY
The settling time is dominated by the crystal used, typical value 3ms.
3
SYNTHTX
The synthesizer settling time is 5 – 50 μs depending on settings, see section AC
Characteristics
4
FULLTX
Data transmission
5
POWERDOWN
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AX8052F131