Datasheet Si8931/32 (Silicon Labs) - 4
| Manufacturer | Silicon Labs |
| Description | Isolated Amplifier for Voltage Measurement |
| Pages / Page | 31 / 4 — 2. System Overview. Si8931. Transmitter. Receiver. Figure 2.1. Si8931 … |
| Revision | 0.5 |
| File Format / Size | PDF / 579 Kb |
| Document Language | English |
2. System Overview. Si8931. Transmitter. Receiver. Figure 2.1. Si8931 Functional Block Diagram. Si8932
Model Line for this Datasheet
Text Version of Document
Si8931/32 Data Sheet System Overview
2. System Overview
The input to the Si8931/32 is designed for 0 to 2.5 V nominal input. The Si8931/32 modulates the analog signal in a unique way for transmission across the semiconductor based isolation barrier. The input signal is first converted to a pulse-width modulated digital signal. On the other side of the isolation barrier, the signal is demodula- ted to faithfully reproduce the analog signal. This solution provides exceptional signal bandwidth and accuracy. The Si8931 provides a differential voltage output while the Si8932 provides a single-ended voltage output. The Si8931/32 implements a fail-safe output when the high-side supply voltage VDDA goes away. The fail-safe output is nominally 2.8 V which can be differentiated from the maximum clipping output voltage of 2.6 V to simplify diagnostics on the system level. The Si8931 outputs a negative differential output voltage while the single-ended Si8932 outputs a positive voltage. When a loss of VDDA supply occurs the part will automatically move into a lower power mode that reduces IDDB current to approxi- mately 1 mA. Similarly, a loss of VDDB supply will reduce IDDA current to approximately 1 mA. When the supply voltage is returned, normal operation begins in approximately 250 μs.
Si8931
VDDA VDDB OSC VIN AOP PWM PWM NC AON
Transmitter Receiver
GNDA CMOS Isolation GNDB
Figure 2.1. Si8931 Functional Block Diagram Si8932
VDDA VDDB OSC VIN AO PWM PWM NC NC
Transmitter Receiver
GNDA CMOS Isolation GNDB
Figure 2.2. Si8932 Functional Block Diagram silabs.com
| Building a more connected world. Preliminary Rev. 0.5 | 4 Document Outline 1. Ordering Guide 2. System Overview 3. Voltage Sense Application 4. Electrical Specifications 4.1 Regulatory Information 4.2 Typical Operating Characteristics 5. Pin Descriptions 5.1 Si8931 Pin Descriptions 5.2 Si8932 Pin Descriptions 6. Packaging 6.1 Package Outline: 8-Pin Wide Body Stretched SOIC 6.2 Package Outline: 8-Pin Narrow Body SOIC 6.3 Land Pattern: 8-Pin Wide Body Stretched SOIC 6.4 Land Pattern: 8-Pin Narrow Body SOIC 6.5 Top Marking: 8-Pin Wide Body Stretched SOIC 6.6 Top Marking: 8-Pin Narrow Body SOIC 7. Document Revision History
2. System Overview
The input to the Si8931/32 is designed for 0 to 2.5 V nominal input. The Si8931/32 modulates the analog signal in a unique way for transmission across the semiconductor based isolation barrier. The input signal is first converted to a pulse-width modulated digital signal. On the other side of the isolation barrier, the signal is demodula- ted to faithfully reproduce the analog signal. This solution provides exceptional signal bandwidth and accuracy. The Si8931 provides a differential voltage output while the Si8932 provides a single-ended voltage output. The Si8931/32 implements a fail-safe output when the high-side supply voltage VDDA goes away. The fail-safe output is nominally 2.8 V which can be differentiated from the maximum clipping output voltage of 2.6 V to simplify diagnostics on the system level. The Si8931 outputs a negative differential output voltage while the single-ended Si8932 outputs a positive voltage. When a loss of VDDA supply occurs the part will automatically move into a lower power mode that reduces IDDB current to approxi- mately 1 mA. Similarly, a loss of VDDB supply will reduce IDDA current to approximately 1 mA. When the supply voltage is returned, normal operation begins in approximately 250 μs.
Si8931
VDDA VDDB OSC VIN AOP PWM PWM NC AON
Transmitter Receiver
GNDA CMOS Isolation GNDB
Figure 2.1. Si8931 Functional Block Diagram Si8932
VDDA VDDB OSC VIN AO PWM PWM NC NC
Transmitter Receiver
GNDA CMOS Isolation GNDB
Figure 2.2. Si8932 Functional Block Diagram silabs.com
| Building a more connected world. Preliminary Rev. 0.5 | 4 Document Outline 1. Ordering Guide 2. System Overview 3. Voltage Sense Application 4. Electrical Specifications 4.1 Regulatory Information 4.2 Typical Operating Characteristics 5. Pin Descriptions 5.1 Si8931 Pin Descriptions 5.2 Si8932 Pin Descriptions 6. Packaging 6.1 Package Outline: 8-Pin Wide Body Stretched SOIC 6.2 Package Outline: 8-Pin Narrow Body SOIC 6.3 Land Pattern: 8-Pin Wide Body Stretched SOIC 6.4 Land Pattern: 8-Pin Narrow Body SOIC 6.5 Top Marking: 8-Pin Wide Body Stretched SOIC 6.6 Top Marking: 8-Pin Narrow Body SOIC 7. Document Revision History
