FX651 Consumer Microcircuits Limited, FX651 Datasheet - Page 13

• Manufacturer Part Number: FX651
• Description: Spm And Security Subsystem
• Manufacturer: Consumer Microcircuits Limited

SPM and Security Subsystem
System Timings (See also Table 1 on next page)
1997 Consumer Microcircuits Limited
(a) SPM (12kHz) channel. Toneburst and tonegaps less than the response and de-response
(b) Security tone (18kHz) channel. The response and de-response times are short to enable the
(c) Transmit Mode. TXOP is modulated by the NRZ DATA pin. An 18kHz toneburst represents logic
are ignored.
device to recognise the short ON-OFF bursts (20ms each).
"0" and "no tone" represents logic "1". Data packets with symbol periods greater than or equal to
6ms can be transmitted.
Figure 3 System Timing Diagrams
13
D/651/4
FX651
delays