Programmable 3D LF Wake-up Receiver

AS3933 LF Receiver ICThe AS3933 is a three-channel low power ASK receiver that is able to generate a wake-up signal when it detects a data signal with an LF carrier frequency of 15-150 kHz. The inbuilt correlator can detect a configurable 16- or 32-bit Manchester wake-up pattern. The device can work on one, two, or three active channels.

The AS3933 offers digital RSSI values for each active channel, customizable data rates, and Manchester decoding with clock recovery. The AS3933 includes an internal clock generator that is either obtained from a crystal oscillator or an internal RC oscillator. The user has the option of using an external clock generator instead.

AS3933’s configurable capabilities allow you to optimize its settings for a greater distance while maintaining reliable wake-up generation. AS3933’s sensitivity can be modified in the presence of a strong field or in noisy settings.

Antenna tuning is substantially simplified because the automated tuning capability provides precise matching to the required carrier frequency.

  • 3-channel ASK wake-up receiver
  • Carrier frequency range 15 – 150 kHz
  • 1-D, 2-D, 3-D wake-up pattern detection
  • 32-bit programmable wake-up pattern
  • Supporting doubling of wake-up pattern
  • Wake-up without pattern detection selectable
  • Wake-up sensitivity 80μVRMS (typ.)
  • Sensitivity level adjustable
  • False wake-up counter
  • Periodical forced wake-up supported (1s-2h)
  • Current consumption in 3-channel listening mode 2.3 μA (typ.)
  • RTC based 32 kHz XTAL, RC-OSC, or external clock
  • Operating supply range 2.4V – 3.6V (TA = 25°C)
  • Operation temperature range -40°C to 85°C”
  • Enables low power active tags
  • Selectable carrier frequency
  • One, two, or three channel operation
  • Highly resistant to false wake-ups
  • Improved immunity to false wake-ups
  • Allows frequency only detection
  • Improved range with best-in-class sensitivity •
  • Provides tracking of false wake-ups
  • Supporting doubling of wake-up pattern
  • Extended battery life
  • Flexible clock configuration
  • Operates from a 3V battery
  • Active RFID Tags
  • Real-Time Location Systems (RTLS)
  • Operator Identification
  • Passive Keyless Entry (PKE)
  • Wireless Sensors


as3933 block diagram



Channels [#] 3
Wake-up sensitivity [µVpp] 225
LF carrier freq. range [kHz] 15-150
Data rate (manch.) [kb/s] 0.5-4
Dynamic range [dB] 64
RSSI step [dB] 2
Package TSSOP-16, QFN-16 (4×4)
Features 32bit programmable wake-up pattern
Supply voltage [V] 2.4-3.6V
Current Consumption [(PD/Listening/Active) µA] -/2.3/8.3
Interface Serial Peripheral Interface
Temperature Range [°C] -40 to +85


Documentation & Downloads

AS3933 Demo Kit

The AS3933 Demo Board demonstrates the main features of the AS3933. These include 3D wake-up pattern detection, readout of false wake-ups, possibility to measure current consumption in different operating modes, and measurement access to SPI communication and data output.

Demonstration Kit »

Demo Kit User Guide »