WT8076 eltrend Passive Infrared (PIR) Controller Version 1.0 25-May-1995 Weltrend Semiconductor, Inc. All Rights Reserved GENERAL DESCRIPTION The WT8076 is a PIR controller IC which integrates amplifier, window detector and light control functions. The light can be controlled by a Relay or Triac with adjustable delay time. A CDS interface is provided to sense day time and night time. A walk-test fuction helps user while setting up the light set. The line remote control function can switch the light set between auto mode and always-on mode. FEATURES • Adjustable detection range • Adjustable delay time • CDS interface to differentiate night time and day time • Walk-test function • Line remote control to switch auto mode and always on mode • Relay or Triac output • High noise immunity • Low power consumption ( operating 500uA, standby 130uA, Typ. ) PIN ASSIGNMENT WT8076N16P1 UOU1 NII1 II1 VREF GND TB TCI 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 WT8076S16P1 UOU2 NII2 II2 CDS VDD ZCD RELAY TRIAC GND TB TCI TRIAC RELAY ZCD VDD 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VREF II1 NII1 UOU1 UOU2 NII2 II2 CDS WT8076N18P2 UOU1 NII1 II1 VREF GND TB TCI TRIAC Ordering Information PART No. WT8076N16P1 WT8076S16P1 WT8076N18P2 PACKAGE 16 Pin P-DIP 16 Pin SOIC 18 Pin P-DIP 1 Weltrend Semiconductor Inc. 2F, No. 24, Industry E. 9 th RD., Science-Based Industrial Park, Hsin-Chu, Taiwan TEL:886-3-5780241 FAX:886-3-5794278.5770419 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 UOU2 NII2 II2 CDS VDD ND WK ZCD RELAY WT8076 eltrend Passive Infrared (PIR) Controller PIN DESCRIPTION Pin No. Name Descriptions 1 2 3 4 5 6 UOU1 NII1 II1 VREF GND TB 3 4 7 8 --TCI 9 10 11 5 6 7 9 10 11 TRIAC RELAY ZCD * * 12 WKT * * 13 ND 12 13 8 9 14 15 VDD CDS 14 15 16 10 11 12 16 17 18 II2 NII2 UOU2 Output of the first stage OP amplifier. Non-inverting input of the first stage OP amplifier. Inverting input of the first stage OP amplifier. Reference voltage output. Ground. Time Base. A RC oscillaror is connected on this pin. Typical frequency is 30kHz. No connection. Time control input. A RC oscillator is connected on this pin. It controls the delay time of the light. Triac control pin. Active low. Relay control pin. Active hight. Zero-crossing input. It detects the zero-crossing point of the AC line. The ouput of TRIAC pin is synchronous to this pin. Walk-Test function enable/disable. Internal pull low. The walt-test function is disbled when this pin is high level. Night and day detection enable/disable. Internal pull low. The night-and-day detection is disbled when this pin is high level. Power supply. Connect a photo-sensitive resistor to detect night time and day time. If the input level is lower than 1.2V, it is day time. If the input level is higher than 1.9V, it is night time. Inverting input of the second stage OP amplifier. Non-inverting input of the second stage OP amplifier. Output of the second stage OP amplifier. N16P1 S16P1 N18P1 1 2 3 4 5 6 13 14 15 16 1 2 7 8 * WT8076N16P1 and WT8076S16P1 : Walk-Test and Night&Day function is always enabled. 2 Weltrend Semiconductor Inc. WT8076 eltrend Passive Infrared (PIR) Controller BLOCK DIAGRAM VDD WT8076 TB System Clock OSC WKT VDD ND CONTROL VDD TCI Counter OSC ZCD LOGIC RELAY CDS CDS 3.2V 1.25V VREF TRIAC Window Detector REF. VOLTAGE Pulse Width Detector 1.95V PIR NII1 1.6V II1 UOU1 NII2 II2 UOU2 WT8076 Block Diagram 3 Weltrend Semiconductor Inc. WT8076 eltrend Passive Infrared (PIR) Controller FUNCTIONAL DESCRIPTION PIR Amplifier The amplifier has two stages, please see block diagram . The voltage gain and frequency response can be adjusted by the external resisters and capacitors. Window Detector If the amplified PIR signal is between VH (1.95V) and VL (1.25V), the signal is ignored and the output of the window detector is low level. If the amplified signal is larger than VH or smaller than VL, the output of the window detector is high level. Pulse Width Detector The pulse width detector detects the pulse width of the window detecter's output. If the pulse width is less than 90ms ( fTB = 30kHz ), this pulse is ignored. If the pulse width is larger than 90ms, it will trigger the light to turn on. Light Control The light is controlled by the RELAY pin or TRIAC pin. The RELAY pin outputs a high level when a valid pulse is detected. The delay time is determined by the RC on the TCI pin. If another valid pulse occurs during the delay time, the delay time will be reset. Fig. 1 shows the relationships. The TRIAC pin is an open drain NMOS output. The turn on angle is about 24O . 1.95V Signal on UOU2 Pin 1.25V <90ms >90ms >90ms <90ms >90ms Window detector output Pulse width detector output RELAY pin delay time 90ms TRIAC pin ZCD pin Figure.1 Timing Relationship 4 Weltrend Semiconductor Inc. eltrend WT8076 Passive Infrared (PIR) Controller CDS Interface The CDS interface detects the level on the CDS pin. If the level is higher than 1.95V, it is night time. If the level is lower than 1.25V, it is day time. Operating Modes The operating modes of WT8076 are: (1) Auto mode: The light will turn on when a valid pulse is detected in the night time. (2) Always on mode: If the ND pin is low level, the light is always on in the night time. When it detects day time, the light will be turn off, and back to auto mode. If the ND pin is high level, the light is always on. (3) Walk-test mode: The walk-test mode is active after the power is on. This mode is same as the auto mode except the CDS is ignored. That is, the light will be turn on when a valid pulse is detected no matter it is night time or day time. Remote Control To switch auto mode between always on mode, the WT8076 detects the zero crossings of the AC line. If the line switch OFF and ON one time in 3 seconds, it toggles the auto mode and always on mode. Time Base The RC oscillator on the TB pin generates the system clock. The frequency is 30kHz typically (R =30Kohm, C=1000pF) . The following parameters are decided by the time base : (1) Trigger angle of the TRIAC (24O , if time base is 30kHz). (2) Pulse width (90ms,if time base is 30kHz). (3) Remote control switch time. (4) Disable PIR after the light is off. (5) Total walk-test time. The RC oscillator on the TCI pin sets the delay time. Figure 2 shows the relationship betwteen delay time and the R ( C=1000pF). 5 Weltrend Semiconductor Inc. WT8076 eltrend Passive Infrared (PIR) Controller ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings Item Symbol Ratings Uit supply voltage 6 V VDD Input Voltage -0.5 to V DD +0.5 V VIN O Operating Temperature -25 to 70 C T OPR O StorageTemperature -65 to 150 C T STG Power Dissipation 500 mW PD Note: Stress above those conditions listed may cause permente damage to the device. Electrical Characteristics ( VDD=5.0V, TA=25OC ) Item Operating Voltage Standby Current Operating Current Reference Voltage Ripple of VREF Time Base Frequency CDS VT+ CDS VTTCI Frequency TRIAC pin Sink Current RELAY pin Source Current Symbol VDD IDDS IDDO VREF fT B VT+ VT+ fTCI IOL IOH Test Condition No load on output. R=30K,C=1000p VOL = 1.5V VOH = 3.5V Min 4.5 3 28 1 - Typ 5 130 500 3.2 30 1.95 1.25 - Max 5.5 600 1000 3.4 0.5 32 2.1 50k 15 5 Unit V mA mA V mV kHz V V Hz mA mA Min Typ Max Unit 4 7 3.5 - 100 65 80 10 10 5 - nA nA mV V uA mA dB dB dB Characteristics of OP Amplifier ( VDD=5.0V, TA=25OC ) Item Symb ol Input Bias Current Input Offset Current Input Offset Voltage Output Swing Voltage Output Source Current Output Sink Current Differential Gain Commom Mode Rejection Ration Power Supply Rejection Ration Ibias Ioffset Voffset Vswing Isource Isink Av CMRR PSRR Test Condition RL=470K 6 Weltrend Semiconductor Inc. WT8076 eltrend Passive Infrared (PIR) Controller TYPICAL APPLICATION CIRCUIT WT8076N18P1 Application Circuit For RELAY Output R9 CDS 470K D1 1N4001 R8 C9 C12 0.47u/250V C10 100u 10V C8 15K 0.047u R6 18 17 L Lamp ZD2 5.6V C11 220u 25V ZD1 12V AC 110V R13 100 560K C7 47u FUSE 1M R11 2.4K R7 51K 47u R12 47 R10 16 15 14 13 12 11 10 UOU2 NII2 II2 CDS VDD ND WKT ZCD RELAY D3 1N4148 RELAY R14 5.6K C13 0.047u 250V N WT8076 UOU1 NII1 II1 VREF GND 1 2 3 4 C6 C3 0.1u R5 100u 5 TB 6 TCI TRIAC 7 9 R2 30K R1 20K C2 1000p C1 1000p 820K R4 15K C5 33u 8 PIR C4 0.01u R3 47K Note: (1) To adjust delay time, change R1 value. ( R1=20K, delay time is about 10 sec ) (2) For different CDS, R8 value should be adjusted. 7 Weltrend Semiconductor Inc. WT8076 eltrend Passive Infrared (PIR) Controller WT8076N18P1 Application Circuit For TRIAC Output CDS R9 470K R10 1M R8 C9 L R7 51K 47u 15K C10 100u 10V D1 C8 0.047u R6 ZD1 5.6V 1N4004 R12 100K 560K C7 47u 18 17 UOU2 NII2 16 II2 15 14 CDS VDD 13 12 11 ND WKT ZCD RELAY R11 WT8076 7 C3 0.1u TCI TRIAC 8 9 100u R2 30K R1 20K C2 1000p C1 1000p 820K R4 15K C5 33u Lamp C11 N 0.1u/250V R13 330 C6 R5 TB 6 AC 110V 10 47 UOU1 NII1 II1 VREF GND 1 2 3 4 5 TRIAC PIR C4 0.01u R3 47K Note: (1) To adjust delay time, change R1 value. ( R1=20K, delay time is about 10 sec ) (2) For different CDS, R8 value should be adjusted. 8 Weltrend Semiconductor Inc.