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LS6507R Datasheet(PDF) 2 Page - LSI Computer Systems |
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LS6507R Datasheet(HTML) 2 Page - LSI Computer Systems |
2 / 12 page 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’s 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 |
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