AX8052F131 datasheet(39/46 Pages) ONSEMI

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Transmitter

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AX8052F131

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

AX5031_PWRMODE register controls which parts of the transmitter are operating.

AX5031_PWRMODE

Name

Description

0000

POWERDOWN

All digital and analog transmitter functions, except the register file, are

disabled. VREG is reduced to conserve leakage power. The registers

are still accessible.

0100

VREGON

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.

0101

STANDBY

The crystal oscillator is powered on; the transmitter is off.

1100

SYNTHTX

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.

1101

FULLTX

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

POWERDOWN

STANDBY

The settling time is dominated by the crystal used, typical value 3ms.

SYNTHTX

The synthesizer settling time is 5 – 50 μs depending on settings, see section AC

Characteristics

FULLTX

Data transmission

POWERDOWN

AX8052F131 Datasheet(PDF) 39 Page - ON Semiconductor

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