LSI/CSI LS6521 UL ® A3800 LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 ADVANCE INFORMATION PIR SENSOR INTERFACE WITH VERY LOW SUPPLY CURRENT DIFFERENTIAL AMPLIFIER Each stage of the two stage Differential Amplifier can be set to have its own amplification and bandwidth. The two inputs to the first stage allow for single-ended or differential connection to PIR Sensors. This stage can be biased anywhere in its dynamic range. The second stage is internally biased so that the Window Comparator’s lower and higher thresholds can be fixed relative to this bias. Signal levels as low as 100µV can be detected. WINDOW COMPARATOR The Window Comparator provides noise filtering by enabling only those signals equal to or greater than a fixed threshold at the output of the Differential Amplifier to appear at the two outputs of the Window Comparator. One output detects positive input signals while the other output detects negative input signals. COMPARATOR DIGITAL FILTER, OUTPUT DURATION TIMER An external timer RC network sets both the digital filter duration time and the output duration timer. The outputs of the Window Comparator are filtered so that motion must be present for a 50ms duration before it can be recognized and appear as pulses at the Digital Filter outputs. The output duration timer is normally set to 4 seconds but is retriggerable depending on the inhibit timer select input. WINDOW TIMER In the Dual Pulse Mode any two detections must occur within a timing window to cause an output to occur. In the triple pulse mode any three detections must occur within a timing window to cause an output to occur. The timing window is programmable using an external RC network. PIN ASSIGNMENT - TOP VIEW (Actual Pin Assignment TBD) DIFF. AMP. 1 OUTPUT 1 DIFF. AMP. 2 INPUT (-) 2 DIFF. AMP. 2 OUTPUT 3 TIMER RC 4 WINDOW TIMER RC 5 LOW BATTERY ADJUST INPUT 6 11 INTRUSION DETECTION OUTPUT MODE SELECT 7 10 LED OUTPUT INHIBIT INPUT 8 9 LS6521 DESCRIPTION: The LS6521 is a CMOS Silicon Gate integrated circuit, designed for detecting motion from a PIR Sensor and initiating appropriate responses. Referring to Figure 2, the detailed description of the functional blocks are as follows: July 2000 16 DIFF. AMP 1 INPUT (-) 15 DIFF. AMP 1 INPUT (+) 14 LOW BATTERY DETECTION 13 V DD 12 V SS (- V ) LSI FEATURES: • Ideal for wireless applications • 4 µA Typical Supply Current • Direct Interface with PIR Sensor • Two-Stage Differential Amplifier • Amplifier Gain and Bandwidth externally controlled • CMOS Compatable Intrusion Detection Output • Separate digital filters for processing positive and negative input signals • Single Pulse/Dual Pulse/Triple Pulse Detection • Battery Saver Output Inhibit • Low Battery Detection Output • System Test Mode • LS6521 (DIP); LS6521-S (SOIC) - See Figure 1 6521-081000-1 (631) 271-0400 FAX (631) 271-0405 (+V ) TEST INPUT TIMER RC FIGURE 1 MODE SELECT The detection mode is selected using a tristate input pin as follows: MODE INPUT Vss Float VDD DETECTION MODE Positive or Negative Input (Single Pulse Mode) Any two detections occuring within a specific time (Dual Pulse Mode) Any three detections occuring within a specific time (Triple Pulse Mode) INHIBIT TIMER SELECT INPUT After the successful detection of an input signal, additional inputs can be inhibited for either 1.5 minutes, 3 minutes or not at all as determined by a tristate input pin. LOW BATTERY ADJUST INPUT An external resistor divider network at the low battery adjust input is used to set the voltage where the low battery indicator output occurs. INTRUSION DETECTION OUTPUT The intrusion detection output produces a high level CMOS compatible signal whenever a valid input occurs whose duration is equal to the output duration timer. LOW BATTERY OUTPUT The low battery output normally provides a high level signal for 2 seconds set by the external timer RC when detecting low battery. The LS6521 power supply is sampled midway during the intrusion detection output so that a low battery condition can be detected under load conditions. TEST INPUT, LED DRIVER OUTPUT Upon the application of power, a power-on reset circuit enables the intrusion detection circuitry to drive an open drain output so that the system can be tested by observing an LED connected to the output. After a time determined by an external R-C network at the test input, the LED driver output is disabled. ABSOLUTE MAXIMUM RATINGS: PARAMETER SYMBOL VALUE UNIT DC supply voltage Any input voltage Operating temperature Storage temperature VDD-VSS VIN TA TSTG +7.5 VSS-0.3 to VDD + 0.3 -40 to +85 -65 to +150 V V °C °C ELECTRICAL CHARACTERISTICS: ( All voltages referenced to VSS, TA = -40˚C to +55˚C, 2.0V ≤ VDD ≤ 7.0V, unless otherwise specified.) PARAMETER SYMBOL SUPPLY CURRENT: VDD = 3.0V VDD = 2.0V- 7.0V MIN TYP MAX UNIT CONDITIONS IDD IDD - 3 4 4.5 7.0 µA µA LED output not loaded LED output not loaded G CMRR PSRR 70 60 60 - - dB dB dB - VS 100 - - µV P-P - 0 - 1.5 V At VDD = 3.0V VIR - 0.3VDD - V - VTHL VTHH - VIR-0.4V VIR+0.4V - V V At VDD = 3.0V At VDD = 3.0V RW CW - 10 0.01 - MΩ µF RT CT - 10 100 - MΩ pF - RTR CTC - - 10 0.1 - MΩ µF - IO -5 - - mA At VDD = 3.0V LB 1.9 - - V - DIFFERENTIAL AMPLIFIERS: Open Loop Gain, Each Stage Common Mode Rejection Ratio Power Supply Rejection Ratio Input Sensitivity (Minimum Detectable Voltage to first amplifier when both amplifiers are cascaded for a net gain of 8,000) Input Dynamic Range Diff. Amp 2 Internal Reference COMPARATOR: Lower Reference Higher Reference Window Timer Timer RC Test Input Timer RC OUTPUT DRIVE CURRENT TA = 25˚C - - (Vo = 0.5V Max.) LOW BATTERY DETECTION The information included herein is believed to be accurate and reliable. However, LSI Computer Systems, Inc. assumes no responsibilities for inaccuracies, nor for any infringements of patent rights of others which may result from its use. 6521-062800-2 TIMER RC INHIBIT INPUT 4 8 INHIBIT TIMER TIMING GENERATOR DIFF AMP 2 3 OUTPUT DIFF AMP 2 INPUT (-) 2 DIFF AMP 1 OUTPUT 1 MODE SELECT 7 WINDOW COMPARATOR OUTPUT DURATION TIMER + - DIFF AMP 1 15 INPUT (+) + - 11 INTRUSION DETECTION OUTPUT DIGITAL FILTER COMP DIFF AMP 1 16 INPUT (-) DRIVER AMP AMP + V DD DIGITAL FILTER + CNT = 2 M U X COMP - WINDOW TIMER WINDOW TIMER RC 5 POR (+V) VDD 13 VSS 12 LOW BATTERY DETECT TIMER LED DRIVER 9 6 LOW BATTERY ADJUST INPUT 14 TEST INPUT RC LOW BATTERY DETECT OUTPUT FIGURE 2. LS6521 BLOCK DIAGRAM 6521 - 070600-3 10 LED OUTPUT