AS3932 Low Frequency IC

Description

The AS3932 is an ultra low power 3-axis ASK wakeup and data receiver that is able to generate a wakeup upon detection of an OOK modulated data signal which uses a low frequency carrier. The integrated correlator is available for analysis of the programmable wakeup pattern. The device can operate using one, two or three active channels.

AS3932 provides a digital RSSI value for each active channel, it supports a programmable data rate and Manchester decoding with clock recovery. AS3932 offers a fully integrated clock generator, which is either derived from a crystal oscillator or the internal RC oscillator.

The programmable features of AS3932 enable to optimize its settings for achieving a longer distance while retaining a reliable wakeup generation. The sensitivity level of AS3932 can be adjusted in presence of a strong field or in a noisy environment.

Key Features

• 3-channel ASK wakeup receiver
• Continuous data reception supported
• Low power listening modes
• High sensitivity at very low current consumption
• One, two or three channel operation
• Programmable wakeup pattern (16bits)
• Single/double wakeup pattern detection
• Wakeup without pattern detection supported
• Adjustable sensitivity level
• False wakeup counter
• Periodical forced wakeup (1s – 2h)
• Data rate adjustable from 0.5 - 4 kbps (Manchester)
• Manchester decoding with clock recovery
• Real-time monitoring of digital RSSI for each channel
• Power down mode
• clock generator based on XTAL or internal RC-OSC

Main characteristics

• Carrier frequency range 110 - 150 kHz
• Wakeup sensitivity 100 µVRMS (typ.)
• 3-channel listening: 1.7 µA (typ.) (on/off mode)
• 5 bit RSSI (dynamic range 64dB)
• Operating temperature range -40 to +85°C
• Operating supply voltage 2.4 - 3.6V (TA = 25°C)
• Bidirectional serial digital interface (SDI)
• Package option QFN16 (4x4), TSSOP16

Applications

• Real-time location systems
• High-value asset tracking
• Container tracking
• Operator identification
• Access control
• Wireless sensors

Block diagram for AS3932 Low Frequency IC