LF Wakeup Receiver

Contents. Introduction LF Wakeup Receiver Example Further Works ATA5283 AS3933 Example Further Works

Introduction Energy save Category SW / HW Passive / Active Identity(address)/Range

ATA5282 Features Three Input Channels for 3D Antennas 2.8 mVPP Sensitivity Typically Ultra Low Current Operation Consumption 2 μA Standby Current Typically 4 μA Active Current Typically Power Supply 2 V to 4.2 V Carrier Frequency Range from 100 kHz to 150 kHz Wake-up Function for a Microcontroller Header Detection Baud Rate up to 4 kbps (ASK Manchester Modulation) Bi-directional Two-wire Interface ESD According to Automotive Requirements

ATA5282 (Block Diagram)

ATA5282 (AGC)

ATA5282 (State)

ATA5282 (Operation)

ATA5282 (Current)

AS3933 Key Feature 3-channel ASK wakeup receiver Carrier frequency range 15 - 150 kHz Programmable wakeup pattern (16-bit or 32-bit) Wakeup sensitivity 80 µVRMS (typ) Adjustable sensitivity level Highly resistant to false wakeups Self calibration of the internal RC-oscillator False wakeup counter Periodical forced wakeup supported (1s – 2h) 3-channel listening mode 1.7 µA (typ) Data rate adjustable from 0.5- 4 kbps (Manchester)

AS3933 (Block Diagram)

AS3933 (Flow chart)

AS3933 (Operation)

Example

Further Works Low power transceiver Auto Poll VS. Standby Mode TX/RX power < 5mA Freq. (400MHz, 800~900MHz, 2.4GHz) Auto Poll VS. Standby Mode