CXRT2133 is a low-power decoding chip based on CMOS technology, designed for pairing with CXRT2132 encoding chip. Its operating voltage range is 6.0V to 16V, which is suitable for various power supply environments, has extremely high noise suppression capability, and can maintain stable decoding under complex electromagnetic interference.
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[ CXRT2133 ]"
Introduction
In the design of smart remote control system, the perfect cooperation between coding and decoding chips is the key to ensure communication reliability. As a dedicated matching decoding chip for CXRT2133, CXRT2132 is manufactured by Advanced CMOS technology and has up to 531441 address coding combinations, providing a safe and stable decoding solution for various remote control systems. This article will deeply analyze the technical characteristics, working principles and application scenarios of CXRT2133 to help engineers give full play to their performance advantages in the design process.
I. Product overview and technical features
CXRT2133 is a low-power decoding chip based on CMOS technology, designed for pairing with CXRT2132 encoding chip. Its operating voltage range is 6.0V to 16V, which is suitable for various power supply environments, has extremely high noise suppression capability, and can maintain stable decoding under complex electromagnetic interference.
Core features include:
· Up to 12-bit tri-state address pins, supporting 531441 address coding combinations, greatly reducing the risk of coding conflicts;
· Up to 6-bit data output pin, support latch output mode, data remains stable;
· External single resistance oscillator to simplify peripheral circuit design;
· Provide DIP18 and DIP 1000.00G packaging forms for easy integration and installation;
· Low Standby current (typical value: 1μa), suitable for battery power supply scenarios.
CXRT2133 is widely used in car security systems, garage door remote control, home security, industrial automation and other fields, and is an ideal choice for building high-reliability remote control systems.
II. Internal structure and pin function
The internal structure of CXRT2133 includes three-state address detection, data detection, frequency divider, controller, matching detection, synchronization detection, oscillator and output logic modules. Its pin design is scientific and supports multiple functions such as address input, data output, and signal reception.
Main pin description:
·A0 ~ A11/D0 ~ D5: address and data reuse pin, support three-state input (0, 1, suspended);
·DIN: serial data input pin to receive encoded waveform from CXRT2132;
·OSC1/OSC2: external timing resistor determines the chip operating frequency;
·VT: valid transmission confirmation pin, high level indicates successful decoding;
·VCC/VSS: Power supply and ground pin.
The chip provides DIP18 and DIP 1000.00g packages, and users can choose flexibly according to system requirements. It should be noted that the CXRT2133 is an electrostatic sensitive device, and anti-static measures should be taken during use and welding to avoid ESD damage.
III. Electrical parameters and performance indicators
CXRT2133 has excellent performance in limit parameters and electrical characteristics. The power supply voltage range is-0.3V to 18V, and the operating temperature range is-40℃ to 85℃, which is suitable for harsh environmental conditions. The chip has good output drive capability and supports a variety of load applications.
The key electrical parameters are as follows:
·Standby current: Typical value: 1μa (VCC = 12V);
·High Level Output Current:-10mA(VCC = 12V,VOH = 6V);
·Low level output current: 9mA(VCC = 12V,VOL = 6V);
·ESD protection: 3000V for human body mode and 300V for mechanical mode.
These parameters ensure high reliability and CXRT2133 of long service life in various application scenarios.
IV. Functional principle and decoding mechanism
CXRT2133 decodes the encoded waveform input by the DIN pin and restores it to address bits, data bits, and synchronization bits. The decoding process includes three key steps: address matching, data extraction and effective transmission confirmation.
4.1. Detailed explanation of decoding process:
4.1.1 waveform recognition: The chip identifies the input address/data bit and synchronization bit waveform;
4.1.2. Address matching: compares the decoded address with the address set locally;
4.1.3. Data output: When the addresses of two consecutive codewords match, the chip drives the corresponding data output pin and pulls up the VT pin;
4.1.4. Latch mechanism: In The latched output mode, the data output remains valid until the next decoding.
4.2. Coding structure description:
·Address/data bit: each pulse consists of two pulse cycles, each pulse contains 16 clock cycles;
·Synchronization bit: The length is 4 address bits, and the pulse width is 1/8 bits wide;
·Coded Word: consists of 12 addresses/data bits and 1 synchronization bit;
·Frame code: consists of multiple encoded words to ensure the integrity of data transmission.
V. Oscillator configuration and frequency matching
The built-in oscillator of CXRT2133 realizes accurate frequency control through a single external resistor. In order to ensure reliable communication with CXRT2132 coding chip, the oscillation frequency of CXRT2133 should be 2.5~8 times that of coding chip. We recommend that you set the decoding frequency in the center of the window to obtain the best anti-interference performance.
A typical resistor configuration example is as follows:
·CXRT2132 with 4.7mohm resistance, CXRT2133 should be equipped with 820kohm resistance;
·CXRT2132 with 3.3 Mohm resistance, CXRT2133 should be equipped with 680 Mohm resistance.
If the operating voltage of CXRT2133 is lower than 6V, the external resistance should be appropriately reduced to ensure normal operation. In addition, the chip also supports infrared operation mode. At this time, CXRT2132-IR outputs 38kHz carrier, and CXRT2133 needs to be configured with 1 Mohm resistor to realize matching decoding.
VI. Workflow and output mode
CXRT2133 Workflow includes power-on initialization, signal detection, address matching, and data output. The chip supports two output modes: instantaneous output and latch output. In the latch mode, the decoded data remains until the next effective transmission, which is suitable for applications where state retention is required.
Workflow description:
6.1. Enter standby mode after power on;
6.2. Detect DIN pin input signal;
6.3. Perform address matching and data decoding;
6.4. If the addresses of two consecutive frames match and the data is consistent, the data is driven to output and the effective transmission is confirmed;
6.5. In the latch mode, the data output is maintained until the next effective decoding.
7. Typical application scenarios
CXRT2133 can be widely used in a variety of remote control scenarios, including but not limited:
7.1. Car security systems: used for car door remote control, alarm trigger, etc;
7.2. Smart home: applied to lighting control, curtain remote control, security system;
7.3. Industrial Automation: realize remote device control and status monitoring;
7.4. Garage door and access control system: provides reliable access control solutions.
Its high coding capacity and strong anti-interference capability make it an ideal choice for high-security applications.
VIII. Packaging and mechanical dimensions
CXRT2133 provides DIP18 and DIP 1000.00G packaging forms, accurate size, in line with international standards. The length of the DIP18 package body is 22.64~23.04mm, and the width is 6.20~6.60mm; The DIP20 package size is slightly larger, which is suitable for more complex circuit layout. For detailed mechanical dimension parameters, see the package diagram in the data sheet.
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