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Si8284 датащи(PDF) 3 Page - Silicon Laboratories |
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Si8284 датащи(HTML) 3 Page - Silicon Laboratories |
3 / 43 page 2. System Overview 2.1 Isolation Channel Description The operation of an Si828x channel is analogous to that of an optocoupler and gate driver, except an RF carrier is modulated instead of light. This simple architecture provides a robust isolated data path and requires no special considerations or initialization at start-up. A simplified block diagram for a single Si828x channel is shown in the figure below. RF OSCILLATOR MODULATOR DEMODULATOR + NOISE FILTER A Semiconductor- Based Isolation Barrier Transmitter Receiver Input Logic Gnd VDD VH VL Figure 2.1. Simplified Channel Diagram A channel consists of an RF Transmitter and RF Receiver separated by a semiconductor-based isolation barrier. Referring to the Transmitter, input A modulates the carrier provided by an RF oscillator using on/off keying. The Receiver contains a demodulator that decodes the input state according to its RF energy content and applies the result to output B via the output driver. This RF on/off keying scheme is superior to pulse code schemes as it provides best-in-class noise immunity, low power consumption, and better immunity to magnetic fields. 2.2 Device Behavior The following table shows state relationships for the Si828x inputs and outputs. Table 2.1. Si8281/82/83/84 Truth Table IN+ IN– VDDA State VDDB–VMID State Desaturation State VH VL RDY FLTb H H Powered Powered Undetected Hi-Z Pull-down H H H L Powered Powered Undetected Pull-up Hi-Z H H L X Powered Powered Undetected Hi-Z Pull-down H H X X Powered Unpowered — — — L H X X Powered Powered Detected Hi-Z Pull-down1 H L Note: 1. Driver state after soft shutdown. Si8281/82/83/84 Data Sheet System Overview silabs.com | Smart. Connected. Energy-friendly. Preliminary Rev. 0.5 | 2 |
Аналогичный номер детали - Si8284 |
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Аналогичное описание - Si8284 |
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