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pir sensor interface june 2009 6506r-060209-1 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 ls6506r LS6507R u l a3800 description the ls6506r is a cmos integrated circuit designed for room oc- cupancy detection and can be used for switching power on to all types of ac loads. the circuit drives a two-coil latching relay (figure 2). when the latching relay is engaged, full ac power is connected to the load. the ls6506r draws its power from the ac hot line and the house- ground connection that is located in a standard wall box. the maximum current draw from the ground line is 500? rms. the LS6507R draws its power from the ac hot and ac neutral lines. all timing is gener- ated from the ac input. the circuit contains a two stage pir amplifier. the sensitivity can be ad- justed by replacing r5 in figure 2 with a potentiometer. upon power up all inputs are disabled for a period of 56 seconds (60hz operation) or 67 seconds (50hz operation) in order for the pir amplifier to reach its quiescent operating state. the circuit contains two operating modes. re- fer to figure 5 for state diagrams. operation for mode 1 is as follows: refer to figure 2. the ic will power up in the off-state , s0 . a mo- mentary pressing of the pushbutton switch sw1, or occupancy de- tection, will cause a negative-going output pulse, lr1, to occur and turn on the light and place the ic in the on-state , s1 . if occupancy is not de- tected, a negative-going output pulse, lr2, will cause the lights to turn off after a time-out of 5, 10, 20 or 30 minutes, or 30 seconds, as se- lected by a potentiometer control at the timer control input. if oc- cupancy is detected before time-out occurs, the selected time-out be- gins again. if time-out occurs and the lights switch off, then occupancy detection, or pressing the pushbutton switch, will switch the lights back on again. once the unit is in s1 , pressing the on/off push-button switch places the unit in the off-state , s2 , and turns the lights off and keeps them off as long as motion is detected, or if motion is not detected the lights will stay off for the time-out period. at the end of the time-out pe- riod, the unit will revert to s0 . whether the lights are on or off, detected motion will cause the led indicator light to blink. features: ? latching relay drive ( ls6506r ) ? ls6506r is suitable for incandescent and fluorescent lights, electronic and magnetic ballasts, motors and heaters, etc. ? triac drive ( LS6507R ) ? sensitivity adjustment ? push-button for manual on/off control ? ambient light override adjustment ? selectable time-out adjustments ? 3 operating modes: 1. manual on or auto on / (manual off and delayed auto on) or (manual off and manual on) or auto off 2. manual on / manual off or auto off 3. manual on or auto on / manual off or auto off ? led indicator light for motion detection ? controls 115vac and 220vac applications ? ls6506r (dip), ls6506r-s (soic); LS6507R (dip), LS6507R-s (soic) - see figures 1a & 1b operation for mode 2 is as follows: in this mode, lights can only be turned on by pressing the on/off push- button. lights will remain on if occupancy is detected. lights will turn off automatically when occupancy no longer exists and the time-out occurs. lights can also be turned off by pressing the on/off push- button. operation for mode 3 is as follows: in this mode, pins 10 and 12 are connected together. one momentary switch is used instead of the two as shown in figures 2 and 3. lights can be turned on by pressing the momentary pushbutton or by oc- cupancy detection. lights will remain on if occupancy is detected. lights will turn off automatically when occupancy no longer exists and the time-out occurs. lights can also be turned off by pressing the mo- mentary pushbutton. refer to the application schematic of figure 2: whenever the mo- mentary switch sw1 is pressed, a 7 second delay period (60hz opera- tion) or an 8.4 second delay period (50hz operation) occurs in which the momentary switch operation is disabled. this enables capacitor c9 to be recharged so that the next operation of sw1 will be properly rec- ognized. an additional control potentiometer at the ldr input is used to adjust the amount of ambient light required to prevent occupancy detection from turning the lights on (mode 1 only) and from resetting the time-out counter. the occurrence of an ambient light condition will not affect a timeout already in progress. the ls6506r can operate using a 12v latching relay. figure 2 shows typical resistor and capacitor values for a 12v relay. z1 is specified as a 15v zener diode. the chip generates its own 5v regulator to power its internal circuits and a separate 5v regulator to power the two stage pir amplifier and external pir. the ls6506r generates 16ms pulses on two outputs for setting/resetting the latching relay. upon power up, the ls6506r generates a reset pulse as soon as its supply voltage reaches the relay coil? set/reset voltage. this ensures that the relay comes up in the off position and occurs 20 seconds (60hz operation) or 24 seconds (50hz operation) after power is applied. for triac operation, the LS6507R is shown in the figure 3 application schematic. the LS6507R has the same features as the ls6506r . this circuit is intended for driving lamps, motors and heaters. the LS6507R has a single output that generates a 50? negative pulse to drive the gate of a triac. the pulse output is delayed from the ac zero- crossover point by 1.2ms. this delay still enables 99% power to be de- livered to the load while allowing circuit power to be derived from the connection to the load. the LS6507R application schematic does not require connection to the house-ground. for calibration purposes in either mode, connecting the timer control to v reg will set the time-out to be 30 seconds allowing for walking test to set the desired sensitivity. note also that a two- position switch may be used instead of a potentiometer for time-out control. in that case, either 5 minutes or 30 seconds is available for time-out. the circuit also has a built-in 2 second dead time at the end of the time-out to pre- vent false turn-ons from occurring.
input / output description pir amplifier this is a two stage amplifier. each stage can be set to have its own amplification and bandwidth. pins 15 and 16 make up the positive and negative inputs for stage 1 and pin 1 is the output. the two inputs allow for single-ended or differential connection to pir sensors. pin 2 is the negative input for stage 2. the output of stage 2 is applied to an internal compar- ator. the positive input of stage 2 is internally biased so that the comparator? lower and higher threshold can be fixed relative to this bias. only those signals greater than a fixed threshold appear at the output of the window comparator. refer to figure 4. lr1 / lr2 output ( ls6506r, pin 6 / pin7 ) for the ls6506r , a 16.66ms negative going pulse appears on the lr1 output whenever conditions call for the latching relay to turn on. when conditions call for the latching relay to turn off, a 16.66ms negative going pulse appears on the lr2 output. each output is capable of sinking 50ma. the outputs are gener- ated in synchronism with the ac voltage input such that the leading edge of these outputs always occur when the ac voltage input switches low. refer to figure 6. potentiometers r2 and r5 are adjusted so that the relay contacts always close and open at the ac zero-crossover at the load. triac output ( LS6507R, pin7 ) with the output duration timer on and a 2.7v p-p 60hz signal applied to the ac input, the output pro- duces a negative going 32us wide pulse in each half-cycle delayed a nominal 1.2ms from the zero- crossing. refer to figure 3. resistors r9 and r10 are used to generate the input which is then ac- coupled into the chip through c9. ac input ( pin 5 ) this input is derived from the ac hot line input. for the ls6506r it is used for synchronizing the relay drive outputs. for the LS6507R it is used for gener- ating the triac output. it is also the source for all tim- ing in the ls6506r and LS6507R . on/off input ( pin 12 ) the on/off input is a momentary input used to turn the latch- ing relay on or off ( ls6506r ) or to enable or disable output pulses to a triac ( LS6507R ). refer to the state diagrams of figure 5. this input has a pull-up resistor which allows the use of a spst momentary switch. ldr input ( pin 11 ) the light determining resistor (ldr) input is used to inhibit motion from turning on the load during daylight hours. re- ferring to figure 2, the ambient level for inhibiting turn-on can be adjusted. there is also approximately 10% hysteresis between inhibiting and enabling at the ldr input. under cer- tain conditions the ldr input is also used to keep the load off when motion is detected. refer to figure 5, mode 1. time control input ( pin 13 ) the voltage level at the time out control input selects 5 differ- ent timeouts and the walking test as shown in table 1. a potentiometer can be used for these selections as shown in figure 2. mode input ( pin 10 ) this input has a pull-up resistor. when this input is left float- ing, mode 1 is selected. when this input is tied to ground, mode 2 is selected. led output ( pin 9 ) this is an open drain output which generates negative-going pulses whenever motion is detected. the output is not af- fected by the ldr input. it is used to sink current from a se- ries resistor ?led network as shown in figure 3. 5v regulator output ( pin 14 ) this regulator is used to provide power to the pir sensor and the internal pir amplifiers as well as the external time- out and ldr networks. 6506r-042908-2
6506r-042308-3 table 1 output operation time as a function of time out input control voltage input voltage 60hz operation 50hz operation units v in = 0 5 6 minutes v in = 0.25v reg 10 12 minutes v in = 0.5v reg 20 24 minutes v in = 0.75v reg 30 36 minutes *v in = v reg 30 36 seconds *walking test: ambient light will not prevent motion from turning the lights on or resetting the time-out counter . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 lsi ls6506r diff. amp. 2 input ( - ) diff. amp. 2 output ac v dd diff. amp 1 input ( - ) diff. amp 1 input ( + ) 5v regulator output time-out input ldr input led output pin assignment - top view figure 1a diff. amp. 1 output on/off v ss mode input lr1 lr2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 lsi LS6507R diff. amp. 2 input ( - ) diff. amp. 2 output triac output v dd diff. amp 1 input ( - ) diff. amp 1 input ( + ) 5v regulator output time-out input on / off ldr input mode input led output pin assignment - top view figure 1b diff. amp. 1 output ac n/c v ss
absolute maximum ratings: parameter symbol value unit dc supply voltage v dd - v ss +17 v any input voltage (except ac) v in vss - 0.3 to v r + 0.3 v ac input voltage v ac vss - 0.3 to v dd + 0.3 v operating temperature t a -40 to +70 ? storage temperature t stg -65 to +150 ? electrical characteristics: (all voltages referenced to v ss , t a = -40?c to +55?c, v dd = 15v, unless otherwise specified.) parameter symbol min typ max unit conditions supply current: v dd = 15v i dd - 250 350 ? figure 2 configuration regulator : voltage v r 4.0 - 6 v - current i r - 100 150 ? - differential amplifiers: open loop gain, each stage g 70 - - db - common mode rejection ratio cmrr - 60 - db - power supply rejection ratio psrr - 60 - db - input sensitivity v s 100 - - ? t a = 25?c, with amplifier (minimum detectable voltage bandpass configuration to first amplifier when both as shown in figure 2 amplifiers are cascaded for a net gain of 5,000) input dynamic range - 0 - 2.0 v - diff. amp 2 internal v ir - 0.3v r - v - reference comparator: lower reference v thl - v ir - 0.5 - v - higher reference v thh - v ir + 0.5 - v - digital filter: input pulse width t pw 66.6 - - ms 60hz operation (for recognition) t pw 80.0 - - ms 50hz operation ldr input: inhibit threshold v thi - 3 0.5v r - v - enable threshold v the - 0.45v r - v - latching relay: output sink current lr1 / lr2 i lo 50 - - ma v out 1.75v drive output pulse width l pw - 16.66 - ms 60hz operation l pw - 20.0 - ms 50hz operation on / off & mode inputs: i nput current source i ds 1 - 4 ua - on threshold voltage ] v thn - - 3 0.5v r v - mode 1 selection ] on threshold voltage ] v thf 0.25v r - - v - mode 2 selection ] 6506r-012608-4
parameter symbol min typ max unit conditions triac: output drive current i to -75 - - ma v o = v dd - 3v 3v triac gate drive output timing: pulse width t pw 20 30 45 us - delay from t od 1.00 1.20 1.32 ms freq = 60hz, zero-crossover and 2.7v p-p ac input delay difference t odd - - 150 us - between zero-crossovers ac input impedance z ac - 2.9 - m w LS6507R led output: sink current i ls 2 - - ma v dd = 15v, v o = 0.5v pulse width d pw - 32 - ms minimium repetition rate d ps - - 2 sec 6506r-042308-5 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.
r1 = 1.5m w r7 = 390k w r2 = 33k w r8 = 1m w r3 = 1.5m w r9 = 1m w r4 = 33k w r10 = 910k w r5 = 1.5m w r11 = 12k w r6 = 36k w r12 = 12k w r7 = 220k w r13 = 56k w , 1/2w r13 = 120k w , 1/2w all rs 1/4w, all cs 10v unless otherwise specified. * = component change for 220vac c1 = 100? c7 = 100pf, 25v sw1 = spst momentary c2 = 10? c8 = 50?, 25v sw2 = spst c3 = 0.01? c9 = 100uf, 25v sw3 = spst c4 = 10? d2, d3 = 1n4148 c5 = 0.01? ldr = silonex nsl-19m51 (typical) c6 = 0.1uf z1 = 15v, 1/2w, 5% d1 = df02 bridge rectifier d1 = df04 bridge rectifier lr = two-coil latching relay (typical): schrack rt314f12, matsushita nais dspia-l2-dc12v panasonic adj23012 pir = perkin-elmer lhi 958 or 878, nicera re200b, sda02-54 (typical) notes: 1. the c8, d1, z1, r7 components generate the dc supply voltage for the ls6506r. 2. the r2, c2, r3, c3, r4, c4, r5, c5, r6, c6 components and the two on-chip differential amplifiers set a nominal gain of 2,000 with bandpass filtering of 0.5hz to 10hz. 3. r5 may be replaced with a potentiometer in order to adjust the sensitivity. 4. the value of r6 may have to be adjusted if the selected pir sensor causes the input static voltage at pin 15 to be out of the input dynamic range. 5. lr1 output closes contacts of relay lr. lr2 output opens contacts of relay lr. 6. total earth ground current is typically 450ua rms. figure 2. typical two-coil latching relay wall switch application 6506r-121508-6 * * * amp 1 out amp 1 ( - ) in amp 2 ( - ) in amp 1 ( + ) in amp 2 out lr1 time out ac ldr v dd v dd v ss r7 z1 r1 c8 c4 r4 c5 r5 1 2 3 6 7 5 8 9 11 12 13 14 15 16 c2 r2 r6 c1 pir sensor r8 r10 ldr r9 r11 led r3 c3 ls6506r c6 + - + - + - + - mode on/off lr2 n 10 v dd p v ss load ac mains 5v reg. out 4 v ss r12 lr led out d1 earth gnd d2 d3 + c9 - sw1 sw3 c7 sw2 r13
r1 = 12k w r8 = 1k w r2 = 33k w r9 = 910k w r3 = 1.5m w r10 = 7.5k w r4 = 33k w r10 = 3.6k w r5 = 1.5m w r11 = 100 w r6 = 36k w r12 = 1.0m w r7 = 270 w , 1/2w r13 = 1.0m w r7 = 1k w , 1w r14 = 910k w all resistors 1/4w, all capacitors 10v unless otherwise specified. c1 = 100? c8 = 1000?, 25v sw1 = spst momentary c2 = 10? c9 = 0.1?, 25v sw2 = spst c3 = 0.01? sw3 = spst c4 = 10? d1 = 1n4004 c5 = 0.01? ldr = silonex nsl-19m51 (typical) c6 = 0.1? z1 = 15v, 1/2w, 5% c7 = 0.47?, 250v t1 = q4008l4 (typical) c7 = 0.33?, 400v t1 = q5004l4 (typical) pir = perkin-elme r lhi 958 or 878 (typical) nicera re200b, sda02-54 (typical) * = component change for 220vac note: the r9, r10, c9 network provides a 2.7v p-p ac signal input to pin 5. figure 3. typical triac wall switch application 6506r-101308-7 ** * * * amp 1 out amp 1 ( - ) in amp 2 ( - ) in amp 1 ( + ) in amp 2 out 5v reg out v ss time out control ac on / off n/c ldr triac out led out v dd v dd v dd ac mains load ti mt2 mt1 r7 r11 c7 z1 d1 r9 c9 r10 c8 r8 v dd c4 r4 c5 r5 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 c2 r2 r6 pir sensor r12 r13 r1 led r3 c3 LS6507R c6 g + - + - p r14 ldr n mode 10 v ss v ss + - + - c1 sw1 sw2 sw3
figure 4. ls6506r / LS6507R block diagram 6506r-042908-8 14 8 4 16 1 2 15 3 13 11 12 5v reg outpu t v dd v ss 5v regulator v reg 5v internal power supply diff amp 1 input ( + ) diff amp 1 input ( - ) diff amp 1 output + - amp + - amp + - cmp + - cmp v reg v reg v reg digital filter 2-sec pulse gen. driver 9 led output driver driver 6 lr1 (6506r) nc (6507r) 7 lr2 (6506r) 1 0 mode input 5 ac + - cmp diff amp 2 input ( - ) diff amp 2 output debounce filter on / off ldr input time-out input adc output duration timer zero cross-over detect control logic triac output (6507r)
md = motion detect nal = no ambient light to = time-out pb = push-button pressed wt = walking test figure 5. state diagrams 6506r-060209-9 mode 1 por (md and (nal or wt)) or (pb) (md and (nal or wt)) s0 off to to s1 on s2 off (md and (nal or wt)) mode 2 s0 off por pb pb (md and (nal or wt)) s1 on pb (to + pb) por s0 off s1 on (to or pb) (md and (nal or wt)) mode 3 (md and (nal or wt)) or pb note: mode 3 is entered by connecting pins 10 and 12 together and using one momentary switch.
u1 = cd4049ub/cd4050b r1, r4 = 51k w , 1/4w r2, r5 = 2m w potentiometer, 1/4w r3, r6 = 100k w , 1/4w c1, c2 = 0.01uf, 25v note: connect u1 pins 11 and 14 to gnd. outputs lr1 and lr2 occur on the negative edge of the ac input at pin 5 of the ls6506r. variable resistors r2 and r5 are adjusted so the relay contact closes and opens at the at the ac zero-crossover at the load. figure 6. zero-crossing adjustment 6506r-012608-10 ac mains lr d2 d3 c9 r12 load sw3 p n 6 10 9 7 4 5 3 2 u1 u1 u1 u1 v dd v dd r1 r2 r3 c1 r4 r5 r6 c2 ls6506r lr2 lr1 v dd 6 7
q1 = mpsa42 or equivalent r1 = 1.5m w , 1/4w (reference figure 2) r2 = 180k w , 1/4w r3 = 12k w , 1/4w r4 = 4.7m w , 1/4w r5 = 91k w , 1w c7 = 0.001uf, 25v (reference figure 2) c8 = 50?, 25v (reference figure 2) z1 = 15v, 5%, 1/2w (reference figure 2) z2 = 5.6v, 10%, 1/4w the ac current drawn from earth ground is regulated to remain virtually constant as the ac mains voltage varies from 120vrms to 277vrms figure 7. earth ground current regulator 6506r-042308-11 d1 q1 r2 r3 r4 z2 z1 c8 r1 sw3 ls6506r v dd ac 5 8 c7 ac mains p n earth gnd r5
6506r-060209-12 figure 8. output timing

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