AS3932-BTST austriamicrosystems, AS3932-BTST Datasheet - Page 13

• Manufacturer Part Number: AS3932-BTST
• Description: IC RF PROGRAM 16-TSSOP
• Manufacturer: austriamicrosystems

Specifications of AS3932-BTST

• Rf Type: Read / Write
• Frequency: 110kHz ~ 150kHz
• Features: RSSI Equipped
• Package / Case: 16-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AS3932-BTSTTR

AS3932
Datasheet - D e t a i l e d D e s c r i p t i o n
ON/OFF mode (Low Power mode 2).
An on-off duty-ratio is defined. This duty ratio is programmable see
Figure 12. ON/OFF Mode
For each of these sub modes it is possible to enable a further feature called Artificial Wake-up. The Artificial Wake-up is a counter based on the
used RTC. Three bits define a time window see
WAKE pin that lasts 128 µs. With this interrupt the microcontroller (µC) can get feedback on the surrounding environment (e.g. read the false
wakeup register, see Correlator register
8.1.3 Preamble Detection / Pattern Correlation
The chip can go in to this mode after detecting a LF carrier only if the data correlator function is enabled see
first for preamble frequency (constant frequency of Manchester clock defined according to bit-rate transmission) and then for data pattern.
If the pattern is matched the wake-up interrupt is displayed on the WAKE output and the chip goes in Data receiving mode. If the pattern fails the
internal wake-up (on all active channels) is terminated and no IRQ is produced.
8.1.4 Data Receiving
The user can enable this mode allowing the pattern correlation or just on the base of the frequency detection. In this mode the chip can be
retained a normal OOK receiver. The data is provided on the DAT pin and in case the Manchester decoder is enabled see
clock is present on the CL_DAT. It is possible to put the chip back to listening mode either with a direct command (CLEAR_WAKE
or by using the timeout feature. This feature automatically sets the chip back to listening mode after a certain time
www.austriamicrosystems.com/LF-Receiver/AS3932
Channel 2
Channel 3
of carrier
Channel 1
Presence
t 0
t 0 + T
R13<7:0>
All active channels are on at the same time but not for the whole time (time slot T is defined as 1ms).
R8<2:0>
) and/or take actions in order to change the setup.
. If no activity is seen within this time window the chip will produce an interrupt on the
2 * t 0
R4<7:6>
Revision 1.4
2 * t 0 + T
.
3 * t 0
R1<1>
R7<7:5>
. The correlator searches
R1<3>
.
, the recovered
(see Table
time
time
time
time
13 - 36
12))