PCA9615DP是NXP公司的一款I²C增强快速模式产品，PCA9615DP是2-channel multipoint Fast-mode Plus differential I2C-bus buffer with hot-swap logic ，本站介绍了PCA9615DP的封装应用图解、特点和优点、功能等，并给出了与PCA9615DP相关的NXP元器件型号供参考。
PCA9615DP - 2-channel multipoint Fast-mode Plus differential I2C-bus buffer with hot-swap logic - I²C增强快速模式 - I²C - 恩智浦, LLC
The PCA9615 is a Fast-mode Plus (Fm+) SMBus/I2C-bus buffer that extends the normalsingle-ended SMBus/I2C-bus through electrically noisy environments using a differentialSMBus/I2C-bus (dI2C) physical layer, which is transparent to the SMBus/I2C-bus protocollayer. It consists of two single-ended to differential driver channels for the SCL (serialclock) and SDA (serial data).
The use of differential transmission lines between identical dI2C bus buffers removeselectrical noise and common-mode offsets that are present when signal lines must passbetween different voltage domains, are bundled with hostile signals, or run adjacent toelectrical noise sources, such as high energy power supplies and electric motors.
The SMBus/I2C-bus was conceived as a simple slow speed digital link for short runs,typically on a single PCB or between adjacent PCBs with a common ground connection.Applications that extend the bus length or run long cables require careful design topreserve noise margin and reject interference.
The dI2C-bus buffers were designed to solve these problems and are ideally suited forrugged high noise environments and/or longer cable applications, allow multiple slaves,and operate at bus speeds up to 1 MHz clock rate. Cables can be extended to at least3 meters (3 m), or longer cable runs at lower clock speeds. The dI2C-bus buffers arecompatible with existing SMBus/I2C-bus devices and can drive Standard, Fast-mode, andFast-mode Plus devices on the single-ended side.
Signal direction is automatic, and requires no external control. To prevent bus latch up,the standard SMBus/I2C-bus side of the bus buffer, the PCA9615 employs static offset,care should be taken when connecting these to other SMBus/I2C-bus buffers that may notoperate with offset.
This device is a bridge between the normal 2-wire single-ended wired-OR SMBus/I2C-busand the 4-wire dI2C-bus.
Additional circuitry allows the PCA9615 to be used for ‘hot swap’ applications, wheresystems are always on, but require insertion or removal of modules or cards withoutdisruption to existing signals.
The PCA9615 has two supply voltages, VDD(A) and VDD(B). VDD(A), the card side supply,only serves as a reference and ranges from 2.3 V to 5.5 V. VDD(B), the line side supply,serves as the majority supply for circuitry and ranges from 3.0 V to 5.5 V.
