Overview
The ADM1278-2ACPZ from Analog Devices Inc. is a hot swap controller and digital power and energy monitor designed to facilitate the safe insertion and removal of circuit boards from live backplanes. This device integrates a 12-bit analog-to-digital converter (ADC) and uses a PMBus™ interface to provide current, voltage, power, and temperature readback. It protects the external FET by limiting the time it remains on during maximum current conditions and employs a constant power foldback scheme to manage power dissipation during power-up and fault conditions. The ADM1278-2ACPZ also features overvoltage (OV) and undervoltage (UV) protection, which can be programmed using external resistor dividers on the UV and OV pins.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Voltage Range | 4.5V to 20V |
| Temperature Rating Range | -40°C to +85°C |
| Package Type | 32-lead frame chip scale package (LFCSP) |
| Number of Pins | 32 |
| Mounting Type | Surface Mount |
| ADC Accuracy | ±0.7% |
| Interface | PMBus™, SPI |
| Current Limit Default | 20mV (adjustable) |
| Moisture Sensitivity Level (MSL) | 3 - 168 hours |
Key Features
- Hot swap capability allowing circuit board insertion and removal from a live backplane
- Integrated 12-bit ADC for current, voltage, power, and temperature readback via PMBus™ interface
- Protection of external FET by limiting the time it remains on during maximum current conditions
- Constant power foldback scheme for controlling power dissipation during power-up and fault conditions
- Overvoltage (OV) and undervoltage (UV) protection programmed using external resistor dividers
- Remote temperature sensing with programmable warning and shutdown thresholds
- Split hot swap and power monitor inputs for additional external ADC filtering
- Reports power and energy consumption over time, peak detect registers for current, voltage, and power
- Current-limit time set by the choice of capacitor connected to the TIMER pin
- Active high enable pin and SPI interface
Applications
- Servers: power monitoring and control/power budgeting
- Telecommunication equipment
- Data communication equipment
Q & A
- What is the primary function of the ADM1278-2ACPZ?
The primary function of the ADM1278-2ACPZ is to act as a hot swap controller and digital power and energy monitor, allowing safe insertion and removal of circuit boards from live backplanes.
- What interface does the ADM1278-2ACPZ use for data communication?
The ADM1278-2ACPZ uses a PMBus™ interface and an SPI interface for data communication.
- What is the operating voltage range of the ADM1278-2ACPZ?
The operating voltage range of the ADM1278-2ACPZ is from 4.5V to 20V.
- What type of package does the ADM1278-2ACPZ come in?
The ADM1278-2ACPZ comes in a 32-lead frame chip scale package (LFCSP).
- What is the temperature rating range of the ADM1278-2ACPZ?
The temperature rating range of the ADM1278-2ACPZ is from -40°C to +85°C.
- How is the current limit set on the ADM1278-2ACPZ?
The current limit on the ADM1278-2ACPZ has a default value of 20mV but can be adjusted if required.
- What kind of protection does the ADM1278-2ACPZ offer for the external FET?
The ADM1278-2ACPZ protects the external FET by limiting the time it remains on during maximum current conditions and using a constant power foldback scheme.
- Can the ADM1278-2ACPZ monitor temperature remotely?
Yes, the ADM1278-2ACPZ supports remote temperature sensing with programmable warning and shutdown thresholds.
- What kind of energy monitoring does the ADM1278-2ACPZ provide?
The ADM1278-2ACPZ reports power and energy consumption over time and includes peak detect registers for current, voltage, and power.
- How is the current-limit time set on the ADM1278-2ACPZ?
The current-limit time on the ADM1278-2ACPZ is set by the choice of capacitor connected to the TIMER pin.
- What is the accuracy of the ADC in the ADM1278-2ACPZ?
The ADC in the ADM1278-2ACPZ has an accuracy of ±0.7%.
