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| eltrend WT8076 Passive Infrared (PIR) Controller Version 1.0 25-May-1995 (c)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 UOU2 NII2 II2 CDS VDD ZCD RELAY TRIAC WT8076S16P1 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 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 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 eltrend WT8076 Passive Infrared (PIR) Controller PIN DESCRIPTION Pin No. N16P1 S16P1 N18P1 Name 1 2 3 4 5 6 7 8 9 10 11 UOU1 NII1 II1 VREF GND TB --TCI TRIAC RELAY ZCD Descriptions 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. 1 2 3 4 5 6 7 8 9 10 11 13 14 15 16 1 2 3 4 5 6 7 * * * * 12 13 WKT ND 12 13 8 9 14 15 VDD CDS 14 15 16 10 11 12 16 17 18 II2 NII2 UOU2 * WT8076N16P1 and WT8076S16P1 : Walk-Test and Night&Day function is always enabled. 2 Weltrend Semiconductor Inc. eltrend BLOCK DIAGRAM WT8076 Passive Infrared (PIR) Controller VDD WT8076 TB VDD ND VDD CONTROL TCI OSC Counter LOGIC RELAY CDS CDS Window Detector TRIAC ZCD OSC System Clock WKT 1.25V VREF REF. VOLTAGE 1.95V 3.2V Pulse Width Detector PIR NII1 1.6V II1 UOU1 NII2 II2 UOU2 WT8076 Block Diagram 3 Weltrend Semiconductor Inc. eltrend FUNCTIONAL DESCRIPTION WT8076 Passive Infrared (PIR) Controller 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 . Signal on UOU2 Pin 1.95V 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. eltrend ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings WT8076 Passive Infrared (PIR) Controller Item Symbol Ratings Uit supply voltage 6 V VDD Input Voltage -0.5 to VDD+0.5 V VIN O Operating Temperature -25 to 70 C TOPR O StorageTemperature -65 to 150 C TSTG 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 Test Condition VDD IDDS IDDO VREF fTB VT+ VT+ fTCI IOL IOH Symb ol 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 Characteristics of OP Amplifier ( VDD=5.0V, TA=25OC ) Item 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 Test Condition Min 4 7 3.5 Typ 100 65 80 Max 10 10 5 Unit nA nA mV V uA mA dB dB dB Ibias Ioffset Voffset Vswing Isource Isink Av CMRR PSRR RL=470K 6 Weltrend Semiconductor Inc. eltrend TYPICAL APPLICATION CIRCUIT WT8076 Passive Infrared (PIR) Controller WT8076N18P1 Application Circuit For RELAY Output CDS R9 470K R8 C9 47u R7 51K 15K C8 0.047u R6 560K C7 47u 18 17 16 15 14 13 12 11 10 D3 1N4148 R14 5.6K RELAY C10 100u 10V ZD2 5.6V C11 220u 25V ZD1 12V D1 1N4001 R10 1M R11 2.4K R12 47 C12 0.47u/250V FUSE L Lamp AC 110V R13 100 C13 0.047u 250V UOU2 NII2 II2 CDS VDD ND WKT ZCD RELAY N WT8076 UOU1 NII1 II1 VREF GND 1 2 C6 C3 0.1u R5 820K R4 15K C5 33u 100u 3 4 5 TB 6 7 TCI TRIAC 8 9 R2 30K C2 1000p R1 20K C1 1000p 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. eltrend WT8076 Passive Infrared (PIR) Controller WT8076N18P1 Application Circuit For TRIAC Output CDS R9 470K R10 1M R8 C9 47u R7 51K 15K C8 0.047u R6 560K C7 47u 18 17 16 II2 15 14 13 12 11 10 R11 47 C11 C10 100u 10V D1 1N4004 ZD1 5.6V L TRIAC R12 100K AC 110V Lamp N UOU2 NII2 CDS VDD ND WKT ZCD RELAY WT8076 UOU1 NII1 II1 VREF GND 1 2 3 4 5 C6 C3 0.1u R5 820K R4 15K C5 33u 100u TB 6 7 TCI TRIAC 8 9 R13 330 R2 30K C2 1000p R1 20K C1 1000p 0.1u/250V 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. |
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