NCS36000GEVB

NCS36000GEVB NCS36000 PIR Sensor Evaluation Board User's Manual General The Passive InfraRed (PIR) sensor evaluation board is designed to evaluate the NCS36000, a fully integrated mixed-signal CMOS device designed for low-cost passive infrared controlling applications. This device integrates two low-noise amplifiers and a LDO regulator to drive the sensor. The output of the amplifiers goes to a window comparator that uses internal voltage references from the regulator. The detection logic processes the output from the window comparator and provides the output to the ‘OUT’ pin. A blinking LED indicates startup and depending on the status of the ‘LED_EN’ pin the LED also lights up when a valid movement is detected. The EVB can be powered from a micro-USB cable connected to a host-USB interface (e.g. pc). Alternatively an external power source ranging from 4–9 V can be connected to pins ‘GND’ and ‘+’ of the 3 pins header ‘H1’. www.onsemi.com EVAL BOARD USER’S MANUAL General Usage Power the evaluation board by plugging a micro-USB cable in connector USB1 or by connecting an external power source with a voltage ranging 4–9 V DC between ‘GND’ and ‘+’ terminal of pin header H1. After power up, the LED1 starts blinking. This lasts about 30 seconds depending on the ‘TIMER’ setting. When LED1 stops blinking, the evaluation board is ready for normal operation. There are two potentiometers on the board. One is labeled ‘SENSITIVITY’ which controls the gain of the band-pass filter. For more information, see the ‘Filter characteristics’ section. The other potentiometer is labeled ‘TIMER’ and controls the system oscillator frequency. Its setting affects the logic subsystems that determine if a movement is detected or not. For more information see the ‘Timing characteristics’ section. Wave your hand above the Fresnel lens. This motion is detected when LED1 turns on. Simultaneously the logic level on the ‘OUT’ pin of pin header ‘H1’ is high. ‘OUT’ is the output of the digital signal processing block. It is possible to monitor the input of the window comparator by probing the ‘OP2_O’ test pin ‘TP2’. The total current consumption of the application can easily be measured by removing the 0 W jumper marked ‘CURR’ and putting an Amp meter in series. Jumpers JP3 (MODE) and JP5 (LED Enable) has following function: Figure 1. Top View of Evaluation Board Figure 2. Bottom View of Evaluation Board Table 1. JUMPER SETTING Jumper State MODE Open Dual Pulse Mode Function MODE Close Single Pulse Mode LED EN Open LED will Not Toggle* LED EN Close LED Toggles after Motion Detected * During start-up LED1 will blink for about 30 s. After this initialization period the LED is disabled. © Semiconductor Components Industries, LLC, 2015 July, 2015 − Rev. 0 1 Publication Order Number: EVBUM2304/D NCS36000GEVB H1 + TP1 D1 U1 GND VIN 1 OUT 5 USB1 BAV170 VBUS C9 4,7  F D− ON / OFF 3 NR/FB 4 2 GND 3V3 CURR MC78PC33 C10 GND_bar C11 100 nF R8 4,7  F 3V3 D+ ID GND R7 3V3 NC VDD 14 VREF C6 IRA−E900 1 LDO & VREF 9 LED 12 MODE 10 XLED_EN JP 5 JP 3 OP 1_P 5 R5 C5 3 8 WINDOW COMPARATOR 100 nF 2 S1 6 OUT 11 DIGITAL CONTROL U2 680 E LED1 OP 1_N 7 3 43 k 100 nF VSS OP 1_O C2 C3 560 k 10 k 2 OP 2_N 33  F R1 R3 P1 10 k OP 2_O R7 P2 500 k 47 k C7 20 k 100 nF SENSITIVITY TP2 C1 MODE 3V3 OSC 10 nF R4 1M LED_EN 13 1 C4 10 nF R2 33  F OSC NCS36000 4 TIMER PC 20 150116.1 Figure 3. Schematic Diagram Filter Characteristics The table shows the gain and the cut-off frequencies for different values of P1 + R4 combination, where P1is the ‘SENSITIVITY’ potentiometer. The band-pass filter is built around 2 low noise operational amplifiers as illustrated in Figure 3. The gain is determined by: G[dB] + 20 @ log Example: G[dB] + 20 @ log NJƪ 1) NJƪ R2 R1 ƫ ƪ @ 1) ƫ ƪ P1 ) R4 R3 560k 800k 1) @ 1) 10k 10k ƫNj ƫNj Table 2. GAIN SETTING (eq. 1) (eq. 2) G[dB] + 73.3 dB The lower cut-off frequency is mainly determined by poles formed by R1 − C1 and R3 − C3. The higher cut-off frequency is dominated by the pole formed by (P1 + R4) – C4. P1 + R4 Gain f−3dB Lo f−3dB Hi 300 kW 64.4 dB 0.72 Hz 24.3 Hz 500 kW 68.8 dB 0.71 Hz 20.4 Hz 700 kW 71.7 dB 0.71 Hz 16.7 Hz 800 kW 72.8 dB 0.70 Hz 16.0 Hz 900 kW 73.8 dB 0.70 Hz 14.8 Hz 1,1 MW 75.5 dB 0.69 Hz 13.1 Hz 1,3 MW 76.9 dB 0.69 Hz 11.7 Hz In Figure 4 gain versus frequency is plotted for different potentiometer settings. www.onsemi.com 2 NCS36000GEVB 80 Band-Pass Filter (dB) 75 70 65 60 55 50 45 40 35 100m 200m 400m 1 2 4 10 20 40 100 Frequency (Hz) Figure 4. Gain of the Band-Pass Filter vs. Frequency; RVAR = P1 + R4 Timing Characteristics window comparator input exceeds VH (positive threshold) or VL (negative threshold) AND the pulse duration TSP is at least 3 clock periods: Potentiometer P2, marked ‘TIMER’ sets the oscillator frequency, which is the clock of the detection system. Changing the frequency influences the reaction time and the sensitivity of the system. In single pulse mode (Jumper JP3 “MODE” closed) a signal from the sensor is detected when the amplitude at the T SP u 3 @ T CLK (eq. 3) This will trigger a mono-flop and ‘OUT’ will be toggled high for 120 clock periods. Figure 5. Single Pulse Detection In dual pulse mode (Jumper JP3 “MODE” removed), 2 consecutive pulses will trigger the mono-flop when the interval TDP between these 2 consecutive pulses is less than 360 clock cycles: T DP t 360 @ T CLK T CLK + ǒP 2 ) R 7Ǔ @ C 7 @ 0.727 (eq. 5) A good choice for most applications is a clock period TCLK = 16 ms, equivalent to an oscillator frequency, fCLK = 62.5 Hz. From equation 5 this corresponds with P2 + R7 = 220 kW and C7 = 100 nF. By using equations 3 and 4 this results in TSP = 48 ms and TDP = 5,76 s. (eq. 4) The oscillator clock period depends on P2 + R7 and C7 and can be calculated as: www.onsemi.com 3 NCS36000GEVB Figure 6. Dual Pulse Detection Interfacing Microcontroller The easiest way to connect a MCU development PCB to the PIR sensor evaluation board is by using pin header H1. Power and ground connections can be shared and the logic levels are 3,3 V compliant. By connecting “OUT” to a general purpose I/O of the microcontroller the sensor output can be easily monitored. It is possible to control the evaluation board more advanced, but this requires some additional wiring. Some suggestions are illustrated in Figure 7 described in the next paragraphs. Figure 7. Schematic Diagram The sensitivity is set by the gain of low noise amplifier 2. See Table 2. In series of R3 a digital potentiometer can be placed controlled by the microcontroller. P1 is removed and R4 is set to 300 kW. See Figure 7 where a CAT5119 in the 10 k version is used needing only 2 control lines. Increasing the gain will extend the detection range. Motion detection is influenced by the mode of operation. In single pulse mode the output toggles for every pulse received under the condition the amplitude and duration are high enough. In dual pulse mode 2 consecutive pulses need to be detected. This avoids false detections. By connecting the MODE input (JP3) directly to an I/O of the microcontroller this selection can be made in software. www.onsemi.com 4 NCS36000GEVB Test-point TP2 is the output of the second low noise amplifier. It is possible to bypass the integrated Detection Logic of NCS36000 by connecting TP2 to an ADC of an external microcontroller. This allows the user to build a customized detection algorithm in software. www.onsemi.com 5 onsemi, , and other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba “onsemi” or its affiliates and/or subsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of onsemi’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. onsemi is an Equal Opportunity/Affirmative Action Employer. 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