features: ? direct interface with pir sensor ? two-stage differential amplifier ? amplifier gain and bandwidth externally controlled ? true and complementary output drives ? separate digital filters for processing positive and negative input signals ? single pulse/dual pulse/ concurrent pulse detection ? adjustable output pulse width ? optional 5v shunt regulator output ? 75? typical supply current ? undervoltage detection ? LS6511N (dip); LS6511N-s (soic) - see figure 1a ls6512 (dip); ls6512-s (soic) - see figure 1a ls6513 (dip); ls6513-s (soic) - see figure 1b applications: security system intrusion detection, automatic doors, motion triggered events such as remote animal photography, etc. description (see figure 5) the LS6511N , ls6512 and ls6513 are cmos integrated circuits designed for detecting motion from a pir sensor and initiating appro- priate responses. 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? lower and higher thresholds can be fixed relative to this bias. signal levels as low as 100? 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 2 outputs of the window comparator. one output detects positive input signals while the other output detects negative input signals. comparator digital filter the outputs of the window comparator are filtered so that motion must be present for a certain duration before it can be recognized and appear as pulses at the digital filter outputs. an external rc network sets the duration time. nominal duration is 50ms. mode select a tristate input pin selects how the detected signals are processed. single pulse (sp) mode is when detection from either a positive or negative input signal at the digital filter outputs will cause an led / relay output to occur. concurrent pulse (cp) mode is when detection from a positive and negative input signal must occur within a specific time before an output will occur. dual pulse (dp) mode is when any two detections within a specific time will cause an output to occur. sp mode = 0; cp mode = open; dp mode = 1. pir sensor interface september 2009 6511n-092509-1 programmable retriggerable one-shots positive and negative input signals at the digital filter outputs will gener- ate retriggerable one-shot pulses. in the concurrent pulse mode, outputs from each one-shot must occur together at some point in time to cause an output to occur. the one-shot pulse width is programmable using an external rc network. typical pulse widths used vary between 1 and 12 seconds. window timer in the dual pulse mode any two detections must occur within a timing window to cause an output to occur. the timing window is program- mable using an external rc network. typical windows are between 1 and 5 seconds. enable input a low on the enable input for ls6513 allows the led / relay and led / relay outputs to respond to the pir input detection. if the enable input is high, then the two outputs remain in their dormant state. the led / relay and led / relay outputs on LS6511N and ls6512 are always enabled. sel udv input for the ls6513 , a low on this input allows undervoltage to be detected. if left floating, undervoltage detection will not occur. output duration timer the duration timer is retriggerable and programmable using an external rc network. typical duration times are between 0.5 and 15 seconds. successive input detections will restart the timer. outputs the led / relay output is an open drain output that will sink current when an input signal is detected and processed. the LS6511N will also sink current when the power supply drops below 3.5v (typical) (under- voltage detection). the undervoltage detection will be removed when the power supply rises above 3.7v (typical). the led / relay output performs identically but is opposite in polarity. the output can sink current from a relay coil returned to a positive voltage (v dd to 15v maximum). the ls6512 will not respond to an undervoltage detection. the ls6513 can be selected to respond or not respond to a power supply undervoltage. the undervoltage detection feature in the LS6511N assures that in security systems tampering with the power supply by loading it and causing it to be reduced in value will be quickly detected. in battery operated non-security systems applications the undervoltage feature is not desireable because it produces unwanted outputs as the batteries age. the ls6512 should be selected for these applications. shunt regulator the LS6511N includes a 5v shunt regulator output which can be tied to the v dd pin so that the circuit can be powered from a higher voltage power supply. note: see figures 2, 3 and 4 for application schematics. lsi/csi l si c o m p u t e r sy s t e m s , i n c . 1 2 3 5 w a l t w h i t m a n r o a d , m e l v i l l e , n y 1 1 7 4 7 ( 6 3 1 ) 2 7 1 - 0 4 0 0 f a x ( 6 3 1 ) 2 7 1 - 0 4 0 5 LS6511N ls6512 ls6513 u l a3800
6511n-072009-2 1 2 3 4 6 7 8 9 10 11 12 13 14 lsi LS6511N ls6512 diff. amp. 2 input ( - ) diff. amp. 2 output cp mode / dp mode rc digital filter rc v dd ( + v ) diff. amp 1 input ( - ) diff. amp 1 input ( + ) 5v regulator output mode select duration timer rc led / relay output pin assignment - top view figure 1a diff. amp. 1 output v ss ( - v ) led / relay output 5 1 2 3 4 5 6 7 10 11 12 13 14 15 16 lsi ls6513 diff. amp. 2 input ( - ) diff. amp. 2 output cp mode / dp mode rc digital filter rc v dd ( + v ) diff. amp 1 input ( - ) diff. amp 1 input ( + ) 5v regulator output mode select duration timer rc pin assignment - top view figure 1b diff. amp. 1 output v ss ( - v ) led / relay output enable 8 9 led / relay output sel udv input 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.
absolute maximum ratings: parameter symbol value unit dc supply voltage v dd - v ss +7 v any input voltage v in v ss - 0.3 to v dd + 0.3 v operating temperature t a -40 to +85 ? storage temperature t stg -65 to +150 ? electrical characteristics: (all voltages referenced to v ss , t a = -40?c to +55?c, 4.5v v dd 6.5v, unless otherwise specified.) parameter symbol min typ max unit conditions supply current: vdd = 5v i dd - 75 100 ? led/relay, led/relay vdd = 4.5v - 6.5v i dd - 125 160 ? and regulator outputs not loaded regulator : voltage v r - 5 - v - current i r - - 15 ma - undervoltage: detection u dv 2.9 3.5 4.1 v } LS6511N recovery u rv 3.05 3.7 4.4 v } ls6513 min. operating voltage v dm - - 3.0 v } ls6512 } ls6513 differential amplifiers: open loop gain, each stage g 70 - - db - common mode rejection ratio c mrr 60 - - db - power supply rejection ratio p srr 60 - - db - input sensitivity v s 100 - - ?p-p t a = 25?c, with amplifier (minimum detectable voltage bandpass configuration to first amplifier when both as shown in figure 3 amplifiers are cascaded for a net gain of 8,000) input dynamic range - 0 - 1.75 v - diff. amp 2 internal v ir - 0.35v dd - v - reference comparator: lower reference v thl - v ir - 0.5v - v at v dd = 5.0v higher reference v thh - v ir + 0.5v - v at v dd = 5.0v digital filter: for 50ms filter time r df - 2.2 - m w - c df - 0.01 - ? - one shot r os - 2.2 - m w - (1 second) c os - 0.22 - ? - window timer r wt - 2.2 - m w - (2.5 second) c wt - 0.68 - ? - concurrent pulse t cp - 1 - sec r cp < 2.2m w } window c cp = 0.22uf } } pin 5 dual pulse t dp - 2.5 - sec r dp = 2.2m w } window c dp = 0.68uf } duration timer t dt - 4 - sec r dt = 2.2m w } pin 6 c dt = 0.68? } output drive current i o -20 - - ma v dd = 5v (v o = 0.5v max.) i o -10 - - ma v dd = v dm 6511n-092509-3
figure 2. typical relay application r1 = see note 2 r2 = 36k w r3 = 1.5m w r4 = 36k w r5 = 1.5m w r6 = 2.2m w (typical) r7 = 2.2m w (typical) r8 = 2.2m w (typical) r9 = 36k w r10 = 2.2k w (typical) note 1 : the relay coil is normally energized and the led is off. when an alarm occurs, the relay coil becomes de-energized and the led is turned on. using the typical application circuit as shown in figure 2, the outputs on pins 8 and 9 occur on power-up because of the large settling time in the amplifier stages. in applications where this is not desireable, the digital filter oscillator must be disabled on power-up long enough to enable the pir amplifiers to stabilize. replacing the r6-c6 circuit shown in figure 2 with the circuit shown in figure 3 will disable the digital filter oscillator until the voltage across the 220? capacitor reaches a value high enough for the oscillator to begin oscillating. component values that can be changed to speed up stabilization include c2, c3, c4 and c5. c3 and c5 become 0.001? and c2 and c4 become 10?. figure 3. inhibiting outputs upon power turn-on 6511n-061509-4 noise considerations layout of any circuit using a high-gain pir amplifier is critical. the pir amplifier components should be located close to the amplifier pins on the chip in order to minimize noise pickup.the oscillator and relay drive components should be located away from the amplifier components. other steps that can help reduce noise is adding a ground shield backplane to the pcb and enhancing the filtering of vdd; i.e., adding a 0.1uf high frequency capacitor across c1 and increasing c1 to 220 ?. pir = perkin-elmer lhi 958, 978 (typical) nicera re200b, sda02-54 (typical) all resistors 1/4w. all capacitors 10v . note 2 : r1 is selected to provide sufficient current to drive the LS6511N and pir sensor. any surplus current is available to drive additional loads applied to the 5v shunt regulator output or is absorbed by the 5v shunt regulator. refer to specifications for current limits. note 3: in sp mode, r7 and c7 are not used and pin 5 is tied to vss. note 4: adjust the value of r9 if the selected pir sensor causes the input static voltage at pin 13 to be out of the input dynamic range of 0v to 1.75v. ( see electrical characteristics on page 2 ) note 5: sensitivity can be adjusted to a lower value by increasing the value of r2 or r4 or by decreasing the value of r3 or r5. note 6 : pins shown in parentheses and connections shown by broken lines are for ls6513 only. c1 = 100? c2 = 10? c3 = 0.003? c4 = 10? c5 = 0.003? d1 = 1n4001 c6 = 0.01? (typical) c7 = 0.22? (cp mode; typical) c7 = 0.68? (dpmode; typical) c8 = 0.22? (typical) c9 = 0.1? c10 = 0.1? relay = no typical p/n amp 1 out amp 1 (-) in amp 2 (-) in amp 1 (+) in amp 2 out 5v reg out cp mode or dp mode rc v ss led / rel out v dd v dd c4 r4 c5 r5 1 2 3 4 5 6 7 9 ( 11 ) 10 ( 12 ) 11 ( 13 ) 12 ( 14 ) 13 ( 15 ) 14 ( 16 ) c2 r2 r9 c9 r1 c1 pir sensor r3 c3 LS6511N/ls6512 ( ls6513 ) c6 r6 + - + - + - 8 ( 10 ) v dd c7 r7 v dd c8 r8 v dd d1 led / rel out mode dig filter rc dur tim rc relay coil raw dc input r10 led s = 3-position spdt ( on-off-on ) s see note 3 c10 + - v dd enable ( 8 ) ( 9 ) sel udv in LS6511N - 4 2.2m 0.01? 220? 220k v dd r6 c6 + -
6511n-060909-5 r1 = 1k w r6 = 36k w c1 = 100? c6 = 10? r2 = 1.5m w r7 = 36k w c2 = 0.003? c7 = 0.01? r3 = 36k w r8 = 36k w c3 = 10? c8 = 0.1? r4 = 1.5 m w r9 = 5.6 m w c4 = 0.003? c9 = 0.1? r5 = 36 k w r10 = 2.4 m w c5 = 10? c10 = 0.1? pirs = perkin-elmer lhi 954, 958, 978; nicera re200b, sda02-54 (typical) all resistors 1/4 w. all capacitors 10v. notes : 1) a pair of pir sensors may be used in applications where a wider optical field of view is needed. 2) external 5v regulator drives the LS6511N and pir sensor. figure 4. differential interface to pir sensor pair figure 5. block diagram amp 1 out amp 1 ( - ) in amp 2 ( - ) in amp 1 ( + ) in amp 2 out 5v reg out c3 r3 c4 r4 1 2 3 12 13 ( 15 ) 14 ( 16 ) r8 c9 r1 c1 pir sensor 1 r2 c2 LS6511N / ls6512 ( ls6513 ) r7 c8 r10 r9 c7 r6 c6 r5 c5 pir sensor 2 + - + - + - + - v dd 5v c10 + - 11 ( 16 ) amp amp comp comp diff amp 2 output diff amp 2 input (-) diff amp 1 output diff amp 1 input (-) diff amp 1 input (+) shunt regulator programmable retriggerable one-shot output duration timer v dd window timer 5 v regulator output led/relay output driver m u x window comparator digital filter v dd v ss digital filter programmable retriggerable one-shot led/relay output driver digital filter rc mode select duration timer rc ( + v ) ( - v ) undervoltage detector - + - + + - + - concurrent pulse/ dual pulse rc sel udv enable
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