AS3933 LF Receiver IC

Programmable 3D LF Wake-up Receiver

The 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.

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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.

FEATURES

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

BENEFITS

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

AS3933 APPLICATIONS

Active RFID Tags
Real-Time Location Systems (RTLS)
Operator Identification
Passive Keyless Entry (PKE)
Wireless Sensors

Product	Part Number	RoHS compl.	PB Free	Package	Packing QTY	Shipping Package
AS3933	AS3933-BQFT	Y	Y	QFN16	1000	TAPE & REEL
AS3933	AS3933-BTST	Y	Y	TSSOP16	1000	TAPE & REEL
AS3933	AS3933-DK		Y	SYSTEM	1	BOX

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