ata5780 ATMEL Corporation, ata5780 Datasheet - Page 6

• Manufacturer Part Number: ata5780
• Description: Uhf Ask/fsk Receiver
• Manufacturer: ATMEL Corporation

2. System Operation Modes
2.1
6
Operation Mode Overview
Atmel ATA5780 [Preliminary]
This section provides an overview of the standard modes and the transition between them.
In the OFF mode all the circuit blocks of the receiver are deactivated. The IC can be woken up
by activating the PWRON pin or NPWRON pins.
In the idle modes most receiver circuits are deactivated. If not, at minimum the oscillators are
deactivated. The Atmel
activates the RC oscillator in the microcontroller section. The second one is IDLE_XTO; in this
mode the Crystal oscillator is active in additional to the RC oscillators.
In RX mode all the circuits necessary for receiving telegrams are active.
In polling mode the receiver is switched between active mode and sleep mode to reduce cur-
rent consumption. During active mode the receiver scans for a valid signal. If no valid signal is
available, the receiver automatically goes into sleep mode. The polling cycle and the wake-up
criteria can be set in the EEPROM of the receiver. In the polling scenario three different appli-
cations can be covered: the Remote Keyless Entry (RKE), the Tire Pressure Monitoring
System (TPMS), and the Remote Start (RS). For the RKE up to three operating frequencies
can be used. Because of the flexibility of the IC the wake-up criteria and polling cycle for each
application can be defined separately in the EEPROM.
®
ATA5780 features two idle modes. The first is IDLE_RC which only
9207BS–RKE–01/11