AS3930 Low Frequency IC

Description

The AS3930 is a single-channel low power ASK receiver that is able to generate a wakeup upon detection of a data signal which uses a LF carrier frequency between 110 - 150 kHz. The integrated correlator can be used for detection of a programmable 16-bit wakeup pattern.

The AS3930 provides a digital RSSI value, it supports a programmable data rate and Manchester decoding with clock recovery. The AS3930 offers a clock generator, which is either derived from a crystal oscillator or the internal RC oscillator.

The programmable features of AS3930 enable to optimize its settings for achieving a longer distance while retaining a reliable wakeup generation. The sensitivity level of AS3930 can be adjusted in presence of a strong field or in noisy environments.

The device is available in 16 pin TSSOP and QFN 4x4 16 LD packages.

Key Features

• Single channel ASK wakeup receiver
• Carrier frequency range 110 - 150 kHz
• Programmable wakeup pattern (16bits)
• Doubling of wakeup pattern supported
• Wakeup without pattern detection supported
• Wakeup sensitivity 100μVRMS (typ.)
• Adjustable sensitivity level
• Highly resistant to false wakeups
• False wakeup counter
• Periodical forced wakeup supported (1s – 2h)
• Low power listening modes
• Current consumption in listening mode 1.37 μA (typ.)
• Data rate adjustable from 0.5 - 4 kbps (Manchester)
• Manchester decoding with clock recovery
• Digital RSSI
• Dynamic range 64dB
• 5 bit RSSI step (2dB per step)
• Clock generator based on 32kHz XTAL, RC-OSC, or external clock
• Operating temperature range -40 to +85ºC
• Operating supply voltage 2.4 - 3.6V (TA = 25ºC)
• Bidirectional serial digital interface (SDI)

Applications

The AS3930 is ideal for Active RFID tags, real-time location systems, operator identification, access control, and wireless sensors.

Block diagram for AS3930 Low Frequency IC