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Si8281BD-IS Datasheet(PDF) 3 Page - Silicon Laboratories

No. de pieza Si8281BD-IS
Descripción Electrónicos  4.0 Amp ISODrivers with Integrated DC-DC Converters
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Fabricante Electrónico  SILABS [Silicon Laboratories]
Página de inicio  http://www.silabs.com
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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


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