Monitoring High Voltages with the ADM1062–ADM1069 Super Sequencers (AN-782)
Learn how to monitor voltage rails exceeding input limits on ADM1062–ADM1069 Super Sequencers using external resistor dividers for scalable power management.
Overview
This application note (AN-782) explains techniques for monitoring voltage rails that exceed the native input ranges of the Analog Devices ADM1062–ADM1069 Super Sequencer family. While these devices feature dedicated pins for monitoring—VH (up to 14.4V), VP (up to 6V), and VX (up to 1.375V)—higher voltages can be monitored by implementing external resistor dividers to scale the supply down to acceptable detection levels. The document details the configuration of internal programmable comparators for undervoltage (UV) and overvoltage (OV) detection, the use of the internal 12-bit ADC for voltage readback via SMBus, and the impact of resistor tolerance on monitoring accuracy.
Use Cases
- Monitoring voltage rails higher than 14.4V in power supply systems.
- Scaling 3.3V or 5V rails for monitoring on VX logic/monitor pins.
- Implementing multi-rail power sequencing and fault detection for high-voltage inputs.
- Real-time voltage telemetry and fault reporting via SMBus in industrial or telecommunications equipment.
Topics
Referenced Parts
Analog Devices
The devices with an on-board 12-bit ADC (ADM1062, ADM106 3, ADM106 4, ADM1066, ADM1069 )
| ADM1062 | Analog Devices | Monitoring High Voltages with the ADM1062–ADM1069 Super Sequencers™ |
| ADM1063 | Analog Devices | Monitoring High Voltages with the ADM1062–ADM1069 Super Sequencers™ |
| ADM1064 | Analog Devices | The devices with an on-board 12-bit ADC (ADM1062, ADM106 3, ADM106 4, ADM1066, ADM1069 ) |
| ADM1066 | Analog Devices | Note that the ADM1066 offers two auxiliary ADC inputs |
| ADM1067 | Analog Devices | The ADM1062–ADM1067 have 10 input pins dedicated to monitoring |
| ADM1068 | Analog Devices | the ADM1068 and ADM1069 have eight (VH, VP1 to VP3, VX1 to VX4). |
| ADM1069 | Analog Devices | the ADM1068 and ADM1069 have eight (VH, VP1 to VP3, VX1 to VX4). |
| ADM1065 | Analog Devices | The ADM1062–ADM1067 have 10 input pins dedicated to monitoring |