ATA5830N-PNQW Atmel, ATA5830N-PNQW Datasheet - Page 10

• Manufacturer Part Number: ATA5830N-PNQW
• Manufacturer: Atmel

Specifications of ATA5830N-PNQW

• Lead Free Status / Rohs Status: Supplier Unconfirmed

To achieve low current in IDLEMode the Atmel ATA5830 can be configured in the EEPROM to
work with the 125kHz RC oscillator (this mode is named IDLEMode(RC)). The Atmel ATA5830
can also be configured for autonomous multi channel and multi application PollingMode(RC).
The external microcontroller is notified with IRQ if an appropriate RF message is received.
Until that takes place, the Atmel ATA5830 periodically switches to RXMode, checks the differ-
ent channels and applications configured in the EEPROM and returns to the IDLEMode(RC)
®
all the while with the external host AVR
microcontroller in a deep sleep mode to achieve a
low average current while being polling for valid RF messages. Once a valid RF message is
detected, it can be buffered within the Atmel ATA5830 to allow the microcontroller time to
wake-up and retrieve the buffered data.
In applications that use the 4.5 to 5.5V supply (VS), it is important to note that only Atmel
ATA5830 Ports PB0..PB7, PC0..PC5 and the external host microcontroller use this supply.
The power amplifier of the Atmel ATA5830 is limited to 3.6V therefore an internal LDO delivers
2.7V to 3.3V supply voltage in TXMode on pin VS_PA. The capacitor on pin VS_PA is needed
to stabilize this regulator and decouple the power amplifier supply voltage. The ports
PC0..PC5 have internal 50k pull-up resistors and can be left open. The ANT_TUNE pin must
be left open.
As in the 3V applications, RF_OUT and RF_IN are matched to SPDT_TX and SPDT_RX by
absorbing the parasitics of the SPDT switch into the matching network, hence the SPDT_ANT
is a 50 RX and TX port. The impedance of the SAW filter is transformed with LC matching
circuits to the SPDT_ANT port and also to the antenna. Care has to be taken to insure the
transmit power going through the SAW does not exceed its power handling capability. The
series capacitor on pin SPDT_ANT is needed because the DC voltage on this pin is set to
VS_PA/2 voltage in TXMode and SAW filters normally should not be subjected to a DC volt-
age. Alternatively, the SAW can also be inserted between SPDT_RX and RF_IN. In this case,
special care for spurious and harmonics of the TX signal is required.
Atmel ATA5830/ATA5830N
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9208DS–RKE–07/11