NCS36000GEVB

NCS36000GEVB NCS36000 PIR Sensor Evaluation Board User s Manual General The Passive InfraRed (PIR) sensor evaluation board is designed to www.onsemi.com evaluate the NCS36000, a fully integrated mixed-signal CMOS device designed for low-cost passive infrared controlling applications. This EVAL BOARD USERS MANUAL 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 49 V can be connected to pins GND and + of the 3 pins header H1. General Usage Power the evaluation board by plugging a micro-USB cable in connector USB1 or by connecting an external power source with Figure 1. Top View of Evaluation Board a voltage ranging 49 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 Figure 2. Bottom View of Evaluation Board 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 jumper marked CURR and putting an Amp meter in series. Jumpers JP3 (MODE) and JP5 (LED Enable) has following function: Table 1. JUMPER SETTING Jumper State Function MODE Open Dual Pulse Mode 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 1 Publication Order Number: July, 2015 Rev. 0 EVBUM2304/DNCS36000GEVB H1 + TP1 D 1 U 1 GND VIN OUT 1 5 3V3 CURR MC78PC33 USB1 NR/FB 3 4 BAV170 GND bar 2 C ON / C C 9 10 11 OFF VBUS R8 4,7 F GND 100 nF 4,7 F D D+ 3V3 ID GND R 7 3V3 680 E LED U 1 NC 2 VDD OUT 8 14 11 LED 9 6 WINDOW VREF LDO & VREF COMPARATOR MODE C 12 6 IRAE900 1 10 XLED EN 100 nF JP 5 JP 3 2 OP 1 P 5 R 5 C5 OSC NCS36000 LED EN MODE OP 1 N 4 7 3 2 1 13 3 100 nF 43 k S 1 3V3 OP 1 O VSS OP 2 N OP 2 O OSC C 4 R C 10 nF 7 2 10 nF 47 k P R P R 2 C 3 1 4 500 k R 3 2 C 7 10 k 20 k 560 k 1M 33 F R 100 nF 1 SENSITIVITY TIMER TP2 C PC 20 150116.1 1 33 F Figure 3. Schematic Diagram Filter Characteristics The table shows the gain and the cut-off frequencies for The band-pass filter is built around 2 low noise different values of P + R combination, where P1is the 1 4 operational amplifiers as illustrated in Figure 3. The gain is SENSITIVITY potentiometer. determined by: Table 2. GAIN SETTING R P R 2 1 4 (eq. 1) G dB 20 log 1 1 P1 + R4 Gain f Lo f Hi 3dB 3dB R R 1 3 64.4 dB 0.72 Hz 24.3 Hz 300 k Example: 500 k 68.8 dB 0.71 Hz 20.4 Hz 560k 800k 700 k 71.7 dB 0.71 Hz 16.7 Hz (eq. 2) G dB 20 log 1 1 10k 10k 800 k 72.8 dB 0.70 Hz 16.0 Hz 900 k 73.8 dB 0.70 Hz 14.8 Hz G dB 73.3 dB 1,1 M 75.5 dB 0.69 Hz 13.1 Hz The lower cut-off frequency is mainly determined by 1,3 M 76.9 dB 0.69 Hz 11.7 Hz poles formed by R C and R C . The higher cut-off 1 1 3 3 frequency is dominated by the pole formed by (P + R ) 1 4 In Figure 4 gain versus frequency is plotted for different C . 4 potentiometer settings. www.onsemi.com 2 10 k DIGITAL CONTROL