4채널 I2C 멀티플렉서 모듈 -PCA9518
(I2C MUX 6 CLICK)
개요
- 본 제품은 4채널 I2C 멀티플렉서 모듈 -PCA9518 입니다.
- I2C 버스에서 제어되는 4 채널 양방향 버퍼 PCA9518 칩을 기반으로 디자인된 제품입니다.
- Enable 핀을 이용하여 원하는 채널을 활성화할 수 있습니다.
특징
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I2C MUX 6 Click as its foundation uses the PCA9518, an expandable four-channel bidirectional buffer controllable through the I2C serial interface from Texas Instruments. The primary SCL/SDA signal pair is directed to four channels where only one SCL/SDA channel can be selected at a time, determined on the state of the four Enable pins, routed to the AN, RST, CS, and PWM pins of the mikroBUS™ socket. The PCA9518 overcomes the restriction of maximum bus capacitance by separating and buffering the I2C data (SDA) and clock (SCL) lines into multiple groups of 400pF I2C channels.
The PCA9518 has several multi-directional open-drain buffers designed to support the standard low-level-contention arbitration of the I2C bus. Except during arbitration, the PCA9518 acts like a pair of non-inverting open-drain buffers, one for SDA and one for SCL. It can communicate with other PCA9518 hubs through a 4-wire inter-hub expansion bus, located on the onboard header with EXP labeled pins, i.e., permits extension of the I2C-bus by buffering both the data (SDA) and the clock (SCL) lines enabling virtually an unlimited number of buses of 400pF.
The PCA9518 communicates with MCU using the standard I2C interface that supports Standard-Mode (100 kHz) and Fast-Mode (400 kHz) operation. As mentioned before, each Enable pin, ENx, controls its associated SDAx and SCLx channels. When the ENx pin is in a low logic state, it isolates its corresponding SDAx and SCLx lines from the system by blocking the inputs from SDAx and SCLx and disabling the output drivers on these lines. It is essential that the ENx change state only when both the global bus and the local port are in an IDLE state to prevent system failures.
This Click board™ is designed for 3.3V operation. It also has onboard terminals labeled as VCC-I2C to supply a voltage, 3.3V or 5V, for PCA9518's I2C lines, which are 5V-tolerant. However, the board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. The Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.
SPECIFICATIONS
Type I2C Applications Can be used for various applications from industrial to medical, communications, and automotive systems On-board modules PCA9518 - four-channel bidirectional buffer controllable through the I2C serial interface from Texas Instruments Key Features Low power consumption, fast I2C interface, 5V tolerant I2C and enable pins to support mixed-mode signal operation, powered-off high-impedance I2C pins, expansion bus, and more Interface I2C Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V
문서
연관제품
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