Intel® FPGA Voltage Sensor IP Core User Guide

ID 683781
Date 2/09/2018
Document Table of Contents

6.1. Using Voltage Sensor in Intel® Arria® 10 and Intel® Cyclone® 10 GX Devices

You can use the voltage sensor feature to monitor critical on-chip power supplies and external analog voltages. The voltage sensor block for the Intel® Arria® 10 and Intel® Cyclone® 10 GX devices supports access from the FPGA core. The following sections describe the flow in using the voltage sensor for the Intel® Arria® 10 and Intel® Cyclone® 10 GX devices.

Figure 6. Voltage Sensor Components

The conversion speed of the ADC is 500 ksps cumulative. When multiple channels are used, the speed per channel is reduced accordingly.

Note: VREFP_ADC pins consume very little current, leakage current accounts for most of the current drawn, which is less than 10 µA. For VREFN_ADC pins, the current is less than 0.1 mA.

For better ADC performance, connect VREFP_ADC and VREFN_ADC pins to an external 1.25 V accurate reference source (±0.2%). An on-chip reference source (±10%) is activated by connecting the VREFP_ADC pin to GND. Treating VREFN_ADC as an analog signal together with the VREFP_ADC signal provides a differential 1.25 V voltage.

Connect both VREFP_ADC and VREFN_ADC pins to GND if no external reference is supplied.

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