AS3933 LF Receiver IC

AS3933 LF Receiver IC Programmable 3D LF wake-up receiver

The AS3933 is a 3-channel low power ASK receiver that is able to generate a wake-up upon detection of a data signal which uses a LF carrier frequency between 15-150 kHz. The integrated correlator can be used for detection of a programmable 16-bit or 32-bit Manchester wake-up pattern. The device can operate using one, two, or three active channels.

The AS3933 provides a digital RSSI value for each active channel,
it supports a programmable data rate and Manchester decoding with clock recovery. The AS3933 offers an internal Clock Generator, which is either derived from a crystal oscillator or the internal RC oscillator.
The user can decide to use the external clock generator instead.

The programmable features of AS3933 enable to optimize its settings for achieving a longer distance while retaining a reliable wake-up generation. The sensitivity level of AS3933 can be adjusted in presence of a strong field or in noisy environments.

Antenna tuning is greatly simplified, as the automatic tuning feature ensures perfect matching to the desired carrier frequency.

AS3933 Blockdiagram

AS3933 LF Receiver IC features and benefits


  • 3-channel ASK wake-up receiver
  • Carrier frequency range 15 – 150 kHz
  • 1-D, 2-D, or 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

Product properties

  • Channels {#} 3
  • Wake-Up Sensitivity [µVpp] 225
  • LF Carrier Freq. Range [kHz] 15 - 150
  • Data Rate (manch). [kbit/s) 0,5 - 4
  • Dynamic Range [dB] 64
  • RSSI Step [dB] 2
  • Package TSSOP16 \ QFN-16 (4x4)
  • Features 32bit programmable wake-up pattern
  • Supply [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


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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.