ax5031 AXSEM, ax5031 Datasheet - Page 24

• Manufacturer Part Number: ax5031
• Description: Datasheet Ax5031
• Manufacturer: AXSEM

24
Circuit Description
5.10. PWRMODE Register
The
A typical
1
2
3
4
6
Version 1.3
Step
PWRMODE
register
PWRMODE
0000
0100
0101
1100
1101
PWRMODE
POWERDOWN
STANDBY
SYNTHTX
FULLTX
POWERDOWN
PWRMODE
POWERDOWN
VREGON
STANDBY
SYNTHTX
FULLTX
register controls, which parts of the chip are operating.
Name
sequence for a transmit session :
Remarks
The settling time is dominated by the crystal used, typical value 3ms.
The synthesizer settling time is 5 – 50 µs depending on settings, see section AC
Characteristics
Data transmission
Description
All digital and analog functions, except the register file, are
disabled. The core supply voltage is reduced to conserve leakage
power. SPI registers are still accessible, but at a slower speed. FIFO
access is possible.
All digital and analog functions, except the register file, are
disabled. The core voltage, however is at its nominal value for
operation, and all SPI registers are accessible at the maximum
speed.
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.
Datasheet AX5031
Typical Idd
11 - 45 mA
0.25 µA
140 µA
500 µA
10 mA