The CXRT2130 is a digital-analog mixed signal processing chip designed for microwave and infrared sensing, manufactured by COMS process, with a working voltage range of 3V ~ 6V. Its core strength lies in the ultra-low static power consumption (at 3V45 μA,5V75μA), especially suitable for battery-powered systems (such as wireless sensor lights, security equipment). The chip integrates high input impedance operational amplifier, double threshold comparator, delay timer and state controller, which greatly simplifies the peripheral circuit and reduces the overall cost.
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[ CXRT2130 ]"
1. Chip Overview
CXRT2130It is a digital-analog mixed signal processing chip designed for microwave and infrared sensing.COMS processManufacturing, operating voltage range 3V～ 6V. Its core strengths areUltra-low static power(<45μA at 3V, <75μA at 5V), especially suitable for battery-powered systems (such as wireless sensor lights, security equipment). The chip integrates high input impedance operational amplifier, double threshold comparator, delay timer and state controller, which greatly simplifies the peripheral circuit and reduces the overall cost.
2. core features
2.1) Minimalist peripheral design
2.1.1) Only the first stage op amp gain (through R2/R3 resistors) and the oscillator RC element (Cr capacitor RT resistor) need to be configured.
2.1.2) Built-in reference voltage source, eliminating external reference circuit.
2.2) Intelligent trigger control
2.2.1) Repeated/non-repeatable trigger mode(controlled by pin A):
2.2.1.1)A=0: It cannot be triggered repeatedly. After the first signal is triggered, it enters a fixed delay (Tx) blocking (Ti) period, during which new signals are ignored.
2.2.1.2)A=1: Repeatable trigger, new signal in Tx phase will reset the delay timing and extend the output time.
2.2.2) Trigger disable terminal (VC pin)：VC<0.2Vdd: Forced output low level, can be connected to the photoresistor to achieve "off during the day and enable at night".
2.3) High drive capability output: The OUT pin can directly drive the relay (± 25mA at 5V, ± 10mA at 3V) without additional amplification circuit.
3. typical application scenarios
| Application areas | Function Description |
|---|---|
| automatic lighting system | Human body induction trigger LED light, delay off |
| Security alarm | Infrared signal detects abnormal movement and alarms |
| Automatic door control | Microwave induction trigger generator open door leaf |
| Intelligent dryer | Induction of human body automatic start and stop |
4. Critical Circuit Design Guide
4.1. Oscillation frequency configuration
Tosc = 0.4 × RT × Cr × (rt/ (RT-20K))Determination (unit: RT = kΩ, Cr = nF, Tosc = μs):4.1.1) Example：RT=100kΩ, Cr=1nF → Tosc=50μs → 频率 f=20kHz.
4.1.2) Attention: RT needs to be> 100kΩ to ensure stability.
4.2. Delay and blocking time setting
| Model | Tx (time delay) | Ti (blockade) | K value | Applicable Scenarios |
|---|---|---|---|---|
| CXRT2130A | 100000 cycle | 20000 cycle | 5 | Short delay (<15 seconds) |
| CXRT2130G | 100000 cycle | 2000 cycle | 50 | Long blocking (anti-interference) |
Total Time：T = (Tx Ti) × Tosc(Example: Tosc = 50μs, CXRT2130D total delay & asymp;5.25 seconds).
4.3. Operational amplifier gain adjustment
first stage gainA1 = R3/R2, total gainA = A1 × 30(Fixed second stage gain):
4.3.1) Example: R2 = 10kΩ, R3 = 3MΩ & rarr; A1 = 300 & rarr; Total gain = 9000.
4.3.2) The detection distance of the infrared probe can be changed by adjusting R3 (Fig. 8.5a).
5. electrical characteristics and encapsulation
5.1) Limit parameters：
5.1.1) Power supply voltage:-0.3V ~ 7V
5.1.2) Working temperature:-45 ℃ ~ 85 ℃
5.2) Packaging Options：
5.2.1)SOP8Compact chip package, suitable for high density PCB.
5.2.2)CPC8: In-line package, easy to weld manually.
6. Design Considerations
6.1) Anti-interference design：
6.1.1) Use LDO (such as HT7533) to isolate Vdd power supply and suppress voltage fluctuation caused by load switching.
6.1.2) Add a high-frequency filter capacitor to the operational amplifier input stage (C3 in Figure 8.5a).
6.2) Photosensitive control scheme: Connect the partial voltage of the photosensitive resistor to the VC pin to realize the light intensity threshold control (VC>0.2Vdd enabled).
Conclusion
CXRT2130 by virtueHigh integration, ultra-low power consumption and flexible trigger logicIt is an ideal solution for microwave infrared induction design. Developers can quickly adapt to security, smart home, automation equipment and other scenarios by adjusting peripheral RC parameters, op amp gain and model suffix (K value), significantly shortening the development cycle and reducing BOM costs.
Technical Specification (Product PDF)Extended application: Combined with photoresistor and repeatable trigger mode (A = 1), an intelligent street lamp system with "automatic lighting at night and delayed shutdown by no one" can be developed.
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Product packaging diagram
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