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LS6511 Datasheet(PDF) 3 Page - LSI Computer Systems |
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LS6511 Datasheet(HTML) 3 Page - LSI Computer Systems |
3 / 4 page FIGURE 2. TYPICAL RELAY APPLICATION R1 = See NOTE 2 R2 = 36k Ω R3 = 1.5M Ω R4 = 36k Ω R5 = 1.5M Ω R6 = 2.2M Ω (Typical) R7 = 2.2M Ω (Typical) R8 = 2.2M Ω (Typical) R9 = 36k Ω R10 = 2.2k Ω (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 220µF 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 0.001µF and C2 and C4 become 10µF. FIGURE 3. INHIBITING OUTPUTS UPON POWER TURN-ON LS6511 - 4 2.2M .01µF 220µF 100k V DD R6 C6 + 6511-090606-3 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 µF. PIRs = 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 LS6511 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. C1 = 100µF C2 = 10µF C3 = 0.003µF C4 = 10µF C5 = 0.003µF D1 = 1N4001 C6 = 0.01µF (Typical) C7 = 0.22µF (CP Mode; Typical) C7 = 0.68µF (DPMode; Typical) C8 = 0.22µF (Typical) C9 = 0.1µF C10 = 0.1µF 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 10 11 12 13 14 C2 R2 R9 C9 R1 C1 PIR SENSOR R3 C3 LS6511 C6 R6 + - + - + - 8 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 + - |
Número de pieza similar - LS6511_06 |
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Descripción similar - LS6511_06 |
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