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Guide for Xilinx FPGAs

MAX16163 Nano Power Controller

Modern FPGA designs leverage advance fabrication techniques, enabling smaller process geometries and lower core voltages. This trend, however, necessitate the use of multiple voltage rails to accommodate legacy I/O standards. To guarantee system stability and prevent unexpected behavior, each of these voltage rails requires dedicated supervision. Analog Devices offers a comprehensive portfolio of voltage monitoring solutions, encompassing a wide range; from basic single-channel to feature-rich multi-voltage supervisors boasting industry-leading accuracy (up to ±0.3% across temperatures). The core, I/O, and auxiliary voltage requirements for various Xilinx® FPGA families are  resented in a clear and easy-to-reference table. Core voltage ranges typically span from 0.72 V to 1 V, while I/O voltage levels can vary between 1 V and 3.3 V.

ANALOG DEVICES MAX16163 Nano Power Controller

Multi-voltage Supervisors with Xilinx FPGAs

Xilinx FPGAs

Xilinx FPGA FamilyCore Voltage (V)Auxiliary Voltage (V)I/O Voltage (V)
Virtex UltraScale+0.85, 0.72, 0.901.81.0, 1.2, 1.35, 1.5, 1.8, 2.5, 3.3
Virtex UltraScale0.95, 11.81.0, 1.2, 1.35, 1.5, 1.8, 2.5, 3.3
Virtex 71, 0.901.8, 2.01.2, 1.35, 1.5, 1.8, 2.5, 3.3
Kintex UltraScale+0.85, 0.72, 0.901.81.0, 1.2, 1.35, 1.5, 1.8, 2.5, 3.3
Kintex UltraScale0.95, 0.90, 1.01.81.0, 1.2, 1.35, 1.5, 1.8, 2.5, 3.3
Kintex 71, 0.90, 0.951.81.2, 1.35, 1.5, 1.8, 2.5, 3.3
Artix UtraScale+0.85, 0.721.81.0, 1.2, 1.35, 1.5, 1.8, 2.5, 3.3
Artix 71.0, 0.95, 0.901.81.2, 1.35, 1.5, 1.8, 2.5, 3.3
Spartan Ultrascale+0.85, 0.72, 0.901.81.0, 1.2, 1.35, 1.5, 1.8, 2.5, 3.3
Spartan 71, 0.951.81.2, 1.35, 1.5, 1.8, 2.5, 3.3

ADI Multi-voltage Supervisors

Number of Voltages MonitoredPart NumberVoltages Monitored (V)Accuracy (%)
1MAX161321.0 to 5.0<1
1MAX16161,MAX161621.7 to 4.85, 0.6 to 4.85<1.5
2MAX161930.6 to 0.9, 0.9 to 3.3<0.3
3MAX161345.0, 4.8, 4.5, 3.3, 3.0,
2.5, 1.8, 1.2, 1.16, 1.0
<1
4LTC2962, LTC2963, LTC29645.0, 3.3, 2.5, 1.8, 1.5,
1.2, 1.0, 0.5V
<0.5
4MAX161355.0, 4.8, 4.5, 3.3, 3.0,
2.5, 2.3, 1.8, 1.5, 1.36,
1.22, 1.2, 1.16, 1.0
<1
4MAX160603.3, 2.5, 1.8, 0.62 (adj)<1
6LTC29360.2 to 5.8 (Programmable)<1

ANALOG DEVICES MAX16163 Nano Power Controller - Power SupplyANALOG DEVICES MAX16163 Nano Power Controller - Power Supply 1

Window Voltage Supervisors
Window voltage supervisors are used to ensure FPGAs operate within a safe voltage specification range.
They do this by having undervoltage (UV) and overvoltage (OV) thresholds and generating a reset output signal if it goes beyond the tolerance window to avoid system errors and prevent damage to your FPGAs and other processing devices. There are two main things to consider when choosing a window voltage supervisor: Tolerance and Threshold Accuracy.
Tolerance is the range around the nominal monitored value which sets the overvoltage and undervoltage thresholds. While, Threshold Accuracy, typically expressed in percentage, is the degree of the conformance of the actual to the target reset thresholds.
Undervoltage and overvoltage threshold variation with Threshold Accuracy

ANALOG DEVICES MAX16163 Nano Power Controller - UndervoltageSelecting the Right Tolerance Window
Choosing a window supervisor with the same tolerance as the core voltage requirement can lead to malfunctions due to threshold accuracy. Setting the same tolerance with the operating requirement of the FPGA can trigger a reset output near the maximum overvoltage threshold OV_TH (max) and minimum undervoltage threshold UV_TH (min). The figure below illustrates tolerance setting (a) same with core voltage tolerance vs. (b) within the core voltage tolerance.

ANALOG DEVICES MAX16163 Nano Power Controller - Window

Impact of Threshold Accuracy

Compare two window voltage supervisors with different threshold accuracy monitoring the same core voltage supply rail. The supervisor with higher threshold accuracy will deviate less from the threshold limits in comparison to voltage supervisors with lower accuracy.
Examining the figure below, window supervisors with lower accuracy (a) creates a narrow power supply window since the reset output signal can assert anywhere within the UV and OV monitoring range. In applications with unreliable power supply regulation, this could pose a more sensitive system prone to oscillation. On the other hand, supervisors with high threshold accuracy (b) expands this range to provide a wider safe operating range for your power supply which improves the systems overall performance.

ANALOG DEVICES MAX16163 Nano Power Controller - Window 1

Power Supply Sequencing
Modern FPGAs utilize multiple voltage rails for optimal performance. Defined power-up and power-down sequencing requirement is crucial for FPGA reliability. Improper sequencing introduce glitches, logic errors, and even permanent damage to sensitive FPGA components. Analog Devices offers a comprehensive range of supervisory/sequencing circuits specifically designed to address the challenges of FPGA power management. These devices orchestrate the power-up and powerdown sequence of various voltage rails, guaranteeing that each rail reaches its designated voltage level within its required ramp time and order. This power management solution minimizes inrush current, prevents voltage undershoot/overshoot conditions, and ultimately safeguards the integrity of your FPGA design.
ADI Supervisory and Sequencing Solutions

Number of Supplies MonitoredPart NumberOperating VrangeThreshold AccuracySequenceProgramming MethodPackage
1: cascadableMAX168951.5 to 5.5V1%UpR’s, C’s6 uDFN
1: cascadableMAX16052, MAX160532.25 to 28V1.8%UpR’s, C’s6 SOT23
2: cascadableMAX6819, MAX68200.9 to 5.5V2.6%UpR’s, C’s6 SOT23
2MAX160412.2 to 28V2.7% and
1.5%
UpR’s, C’s16 TQFN
3MAX1604220 TQFN
4MAX1604324 TQFN
4: cascadableMAX16165, MAX161662.7 to 16V0.80%Up, Reverse- Power DownR’s, C’s20 WLP,
20L TQFN
MAX160502.7 to 16V1.5%Up, Reverse- Power DownR’s, C’s28 TQFN
5: cascadableMAX16051
6: cascadableLTC29374.5 to 16.5V<1.5%ProgrammableI2C, SMBus28 QFN
8ADM11683 to 16V<1%ProgrammableSMBus32 LQFP
8ADM11693 to 16V<1%ProgrammableSMBus32 LQFP,
40 LFCSP
10: cascadable  (max of 4)ADM12603 to 16V<1%ProgrammableSMBus40 LFCSP
12: cascadableADM11663 to 16V<1%ProgrammableSMBus40 LFCSP,
48 TQFP
17: cascadableADM12663 to 15V<1%ProgrammablePMBus64 LFCSP

ANALOG DEVICES MAX16163 Nano Power Controller - Regulators

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Documents / Resources

ANALOG DEVICES MAX16163 Nano Power Controller [pdf] Instructions
MAX16163, MAX16164, MAX16132, MAX16133, MAX16134, MAX16135, LTC2937, MAX16163 Nano Power Controller, MAX16163, Nano Power Controller, Power Controller, Controller

References

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