AX5043-QFN28-TU AXSEM, AX5043-QFN28-TU Datasheet - Page 23

• Manufacturer Part Number: AX5043-QFN28-TU
• Description: RF Transceiver Narrow-Band-IC
• Manufacturer: AXSEM

Specifications of AX5043-QFN28-TU

• Number Of Receivers: 1
• Number Of Transmitters: 1
• Wireless Frequency: 70 MHz to 1050 MHz
• Interface Type: SPI
• Output Power: 18 dBm to 22 dBm
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Maximum Supply Current: 60 mA
• Minimum Operating Temperature: - 40 C
• Modulation: ASK, FSK
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

23
Circuit Description
5.1.
Voltage Regulators
The
AX5043
uses an on-chip voltage regulator system to create stable supply voltages for the
internal circuitry from the primary supply VDD_IO. The I/O level of the digital pins is VDD_IO.
Pins VDD_ANA are supplied for external decoupling of the power supply used for the on-chip PA.
The voltage regulator system must be set into the appropriate state before receive or transmit
operations can be initiated. This is handled automatically when programming the device modes via
PWRMODE
the
register.
POWSTAT
Register
contains status bits that can be read to check if the regulated voltages are
ready (bit SVIO) or if VDD_IO has dropped below the brown-out level of 1.3V (bit SSUM).
In power-down mode the core supply voltages for digital and analog functions are switched off to
minimize leakage power. Most register contents are preserved but access to the FIFO is not
possible and FIFO contents are lost. SPI access to registers via SPI is possible, but at lower speed.
In deep-sleep mode all supply voltages are switched off. All digital and analog functions are
disabled. All register contents are lost. To leave deep-sleep mode the pin SEL has to be pulled low.
This will initiate startup and reset of the
AX5043.
Then the MISO line should be polled, as it will be
held low during initialization and will rise to high at the end of the initialization, when the chip
becomes ready for operation.
Version 0.2
Preliminary
Datasheet AX5043