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NCS36000DRG Datasheet(PDF) 4 Page - ON Semiconductor |
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NCS36000DRG Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 8 page NCS36000 www.onsemi.com 4 APPLICATIONS INFORMATION Oscillator The oscillator uses an external resistor and capacitor to set the system clock frequency. Multiple clock frequencies can be selected using different combinations of resistors and capacitors. Figure 2 shows a simplifier block diagram for the system oscillator. + − + − OSC 13 Q Q SET CLR S R 14 VDD Figure 2. Block Diagram of System Oscillator Circuit LDO Regulator The LDO regulator provides the reference voltage for the sensor and all other analog blocks within the system. The nominal voltage reference for the sensor is 2.7 V ±5%. An external capacitor is needed on the VREF pin to guarantee stability of the regulator. Differential Amplifiers The two differential amplifiers can be configured as a bandpass filter to condition the PIR sensor signal for the post digital signal processing. The cutoff frequencies and passband gain are set by the external components. See Figure 5. 10 −1 10 0 10 1 20 30 40 50 60 70 80 Figure 3. Plot Showing Typical Magnitude Response of Differential Amplifiers When Configured as a Bandpass Filter Window Comparator The window comparator compares the voltage from the second differential amplifier to two reference voltages from the LDO regulator. COMP_P triggers if OP2_O is greater than the Vh voltage and COMP_N triggers if OP2_O is lower than the Vl voltage. See Figures 4 and 5. Vh Vl Vdd Vss Comp_P Vdd Vss Comp_N OP2_O Vm Figure 4. Plot Showing Functionality of Window Comparator for an Analog Input OP2_O |
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