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LS6522 Datasheet(PDF) 1 Page - LSI Computer Systems |
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LS6522 Datasheet(HTML) 1 Page - LSI Computer Systems |
1 / 8 page FEATURES: • Low Quiescent Current • Direct Interface with PIR Sensor • Two-Stage Differential Amplifier • Amplifier Gain and Bandwidth externally controlled • Window Comparator and Digital Filter limit Noise • Triac or Relay Output Drive • Programmable Output Duration Timer • Ambient Light Level Inhibit input • Selectable Dead Time • Single or Dual Pulse Detection • Timing derived from RC Oscillator or 50Hz/60Hz AC • Regulated 5V Output for PIR Sensor • Motion Detection LED Indicator • LS65 22 (DIP); LS6522-S (SOIC-NB); LS65 22-SW (SOIC-WB) - See Figure 1 APPLICATIONS: Indoor occupancy sensors and outdoor motion-triggered lighting for energy savings, security and convenience. . DESCRIPTION: (See Figure 2) The LS65 22 is a CMOS integrated circuit, designed for detecting motion from a PIR Sensor and initiating appropri- ate responses. The detailed description of the functional blocks is as follows: 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 con- nection 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 thresh- olds can be fixed relative to this bias. 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 output of the Window Comparator. COMPARATOR DIGITAL FILTER The output of the Window Comparator is filtered so that motion must be present for a certain duration before it can be recognized and appear as pulses at the Digital Filter output. OUTPUT DURATION TIMER The voltage level at the TIMER CONTROL input can select 16 different timeouts for this Timer (See Table 1). The selection can be made by varying the setting of a potentiometer. The Timer is retriggerable and controls the ON duration of the TRIAC/RELAY output. The trigger for the Timer is generated from pulses appearing at the Digital Filter output. SINGLE PULSE/DUAL PULSE MODES A Single Pulse or Dual Pulse (two pulses occurring within a specified time period) at the Digital Filter output can be selected as the trigger for the Output Duration Timer. This selection is made by the logic level at the PULSE MODE SELECT input. Logic 0 = Single Pulse Mode, logic 1 = Dual Pulse Mode. LED OUTPUT This is an open drain output which is turned on by pulses generated by a retriggerable one-shot. The one-shot is triggered by the leading edge of pulses appearing at the Digital Filter output. When turned on, this output can sink current from a series Resistor-LED network returned to a positive voltage (V DD to 12.5V maximum). This results in the LED lighting whenever motion is detected. PIR SENSOR INTERFACE February 201 4 65 22-021214-1 LSI/CSI LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405 LS65 22 UL ® A3800 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 DIFF. AMP. 2 INPUT (- ) DIFF. AMP. 2 OUTPUT AC INPUT OSCILLATOR INPUT TRIAC/RELAY OUTPUT V DD DIFF. AMP 1 INPUT (- ) DIFF. AMP 1 INPUT (+) 5V REGULATOR OUTPUT TIMER CONTROL INPUT DEAD TIME SELECT INPUT INHIBIT INPUT PULSE MODE SELECT INPUT LED OUTPUT PIN ASSIGNMENT - TOP VIEW FIGURE 1 DIFF. AMP. 1 OUTPUT V SS |
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