CXRT2130 is a mixed signal processing chip designed specifically for microwave and infrared sensing. It is manufactured using COMS technology and operates within a voltage range of+3V to+6V. Its core advantage lies in ultra-low static power consumption (at 3V)At 45 μ A and 5V75μA）， Especially suitable for battery powered systems (such as wireless induction lights, security equipment). The chip integrates high input impedance operational amplifiers, dual threshold comparators, delay timers, and state controllers, greatly simplifying peripheral circuits and reducing overall costs.
-
[ CXRT2130 ]"
1、 Chip Overview
CXRT2130 It is a mixed signal processing chip designed specifically for microwave and infrared sensing, usingCOMS processManufacturing, operating voltage range+3V～+6VIts core advantage lies inUltra low static power consumption(3V<45μ); A. <75μ at 5V; A）， Especially suitable for battery powered systems (such as wireless induction lights, security equipment). The chip integrates high input impedance operational amplifiers, dual threshold comparators, delay timers, and state controllers, greatly simplifying peripheral circuits and reducing overall costs.
2、 Core Features
2.1) Minimalist peripheral design
2.1.1) Only the first stage operational amplifier gain (through R2/R3 resistors) and oscillator RC element (Cr capacitor+RT resistor) need to be configured.
2.1.2) Built in reference voltage source, eliminating the need for external reference circuits.
2.2) Intelligent trigger control
2.2.1) Repetitive/Non Repetitive Trigger Mode(Controlled by pin A):
2.2.1.1)A=0Cannot be triggered repeatedly. After the first signal is triggered, it enters a fixed delay (Tx)+lockout (Ti) cycle, during which new signals are ignored.
2.2.1.2)A=1Repeatable triggering, new signals during the Tx phase will reset the delay timer, extending the output time.
2.2.2) Trigger prohibition terminal (VC pin)：VC< 0.2VddForced output low level, can be connected to a photoresistor to achieve“ Closed during the day and enabled at night;.
2.3) High driving capability outputThe OUT pin can directly drive the relay (at 5V); 25mA, 3V± 10mA）， No additional amplification circuit is required.
3、 Typical application scenarios
| Application field | Functional Description |
|---|---|
| Automatic lighting system | Human body induction triggers LED light, delayed shutdown |
| Security alarm | Infrared signal detects abnormal movement and alerts |
| Automatic door control | Microwave induction triggers motor to open door |
| Intelligent dryer | Sensing human body automatic start stop |
4、 Guidelines for Key Circuit Design
4.1. Oscillatory frequency configuration
Tosc = 0.4 × RT × Cr × (RT/(RT-20K)) Decision (Unit: RT=kΩ); , Cr=nF, Tosc=μ s）：4.1.1) Example：RT=100kΩ , Cr=1nF → Tosc=50μ s → Frequency;f=20kHz.
4.1.2) AttentionRT needs to be>100kΩ To ensure stability.
4.2. Delay and blockade time setting
| model | Tx (Delay) | Ti (blockade) | K value | Applicable scenarios |
|---|---|---|---|---|
| CXRT2130A | 100000 cycles | 20000 cycles | five | Short latency (<15 seconds) |
| CXRT2130G | 100000 cycles | 2000 cycles | fifty | Long blockade (anti-interference) |
Total time：t = (Tx + Ti) × Tosc(Example: Tosc=50μ); At s, CXRT2130D total delay& amp; 5.25 seconds).
4.3. Operational amplifier gain adjustment
First level gain;A1 = R3/R2Total gain;A = A1 × thirty(Fixed second stage gain):
4.3.1) Example：R2=10kΩ , R3=3MΩ → A1=300 → The total gain is 9000.
4.3.2) By adjusting R3, the detection distance of the infrared probe can be changed (Figure 8.5a).
5、 Electrical characteristics and packaging
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 patch packaging, suitable for high-density PCBs.
5.2.2)CPC8Direct insertion packaging, convenient for manual soldering.
6、 Design considerations
6.1) Anti interference design：
6.1.1) Use LDO (such as HT7533) to isolate the VDD power supply and suppress voltage fluctuations caused by load switching.
6.1.2) Add a high-frequency filtering capacitor (as shown in C3 of Figure 8.5a) to the input stage of the operational amplifier.
6.2) Light sensitive control schemeConnect the voltage divider of the photoresistor to the VC pin to achieve threshold control of light intensity (VC>0.2VDD enabled).
Conclusion
CXRT2130 withHigh integration, ultra-low power consumption, and flexible triggering logicBecoming an ideal solution for microwave infrared induction design. Developers can quickly adapt to scenarios such as security, smart homes, and automation equipment by adjusting peripheral RC parameters, operational amplifier gains, and model suffixes (K values), significantly shortening development cycles and reducing BOM costs.
Technical Specifications (Product PDF);Extended applicationBy combining photoresistors with repeatable triggering mode (A=1), it is possible to develop“ At night, the lights automatically turn on when there is someone, and the lights turn off after a delay when there is no one; The intelligent streetlight system.
For detailed PDF specifications, please scan WeChat to contact us. You can also receive free samples and technical support！
Product packaging diagram;
Selection Guide for Related Chips; More similar products .....
| Microwave infrared induction; Infrared Induction | ||||||
| model | Working Voltage | quiescent current | feature | encapsulation | remark | |
| CXRT2124 | 3-5V | 50uA@VDD =3V | low power consumption | SOP16 | Microwave infrared induction compatible with BISS0001 | |
| 100uA@VDD =5V | ||||||
| CXRT2122 | 3-6V | 35uA@VDD =3V | low power consumption | SOP8 | The microwave infrared induction package is small, and the CXRT2124 has a simpler peripheral design | |
| 65uA@VDD =5V | ||||||
| CXRT2130 | 3-6V | 45uA@VDD =3V | low power consumption | SOP8\CPC8 | Microwave infrared induction is simpler than the CXRT2122 peripheral, and it lights up during the day when it is in a photosensitive state | |
| 75uA@VDD =5V | ||||||
| CXRT2131 | 3-5.5V | 45uA@VDD =3V | low power consumption | SOP8\CPC8 | Under microwave infrared induction photosensitive state, the light does not turn on during the day | |
| 75uA@VDD =5V | ||||||
| rolling code | ||||||
| model | Working Voltage | quiescent current | feature | encapsulation | remark | |
| CXRT2121 | 3.5-13.0V | 1uA | low power consumption | SOP8 | Rolling code encoding chip | |
| Power amplifier chip | ||||||
| model | Working Voltage | quiescent current | Maximum output power | efficiency | feature | encapsulation |
| CXAR41222 | 3-5V | 3mA@VDD =3V | 3W | 90% | 3W single channel D-class unfiltered audio amplifier | SOP8 |
| 5mA@VDD =5V | ||||||
| CXAR41218 | 2.2-5.2V | 3.6mA@VDD =3V | 3W | 90% | 3W dual channel unfilteredD-class audio amplifier | SOP16 |
| 5mA@VDD =5V | ||||||
| CXAR41219 | 2.5-5.5V | 6mA@VDD =5V | 3W | 88% | 3W anti chipping function dual channel no filterD-class audio amplifier | SOP16 |
| Operational amplifier comparator; Amplifier | ||||||
| model | Working Voltage | quiescent current | Maximum offset voltage | bandwidth | feature | encapsulation |
| CXAR41214 | 2.7-5.5V | 80uA | 6mV | 1M | Low power consumption, rail to rail input-output dual channel operational amplifier | SOP8 |
| CXAR41215 | 2.7-5.5V | 2.7-5.5V | 6mV | 4M | Low power consumption, rail to rail input-output high-speed dual channel rail to rail operational amplifier chip | SOP8 |
| CXAR41327 | 2.7-5.5V | 0.43mA | 6mV | 6M | Operational amplifier comparator, high-speed rail to rail dual channel operational amplifier | SOP8 |
| CXAO42299 | 3-18V | 1.5mA | 5mV | 1M | Operational amplifier comparator with four independent operational amplifiers | SOP14 |
| CXAO42300 | 3-30V | 0.7mA | 5mV | 1M | Operational amplifier comparator dual channel operational amplifier chip | SOP8 |
| CXAO42301 | 2-36V | 0.8mA | 5mV | 1M | Operational amplifier comparator, dual independent comparator | SOP8 |
