## Overview of ADM1175-4ARMZ-R7 The **ADM1175-4ARMZ-R7** is a high-performance, integrated **Hot Swap Controller** and **Digital Power Monitor** with an I2C interface. It is designed to allow boards to be safely inserted and removed from a live backplane while providing precise telemetry for voltage and current. --- ### Technical Specifications | Feature | Specification | | :--- | :--- | | **Manufacturer** | Analog Devices Inc. (ADI) | | **Input Voltage Range** | 3.15 V to 16.5 V | | **Operating Current** | 1.7 mA (typical) | | **ADC Resolution** | 12-bit | | **Interface** | I2C (Serial Data/Clock) | | **Package** | 10-Lead MSOP (Mini Small Outline Package) | | **Operating Temp** | -40°C to +85°C | --- ### Core Functions and Features #### 1. Hot Swap Control The device controls an external N-channel MOSFET to manage the "soft start" of a circuit. It limits the inrush current to prevent power spikes that could damage components or cause the system voltage to sag. #### 2. Digital Power Monitoring It includes an internal 12-bit Analog-to-Digital Converter (ADC). This allows the system to monitor: * **VCC Voltage:** The supply voltage level. * **SENSE Voltage:** The voltage drop across a shunt resistor to calculate current consumption. #### 3. Protection Mechanisms * **Overcurrent Protection:** If the current exceeds a programmable threshold, the gate drive is pulled low to turn off the MOSFET. * **Undervoltage Lockout (UVLO):** Ensures the device does not operate until the input voltage is high enough for stable performance. #### 4. I2C Programmability The ADM1175-4 version features specific internal address settings and allows for: * Configuring the ADC sampling rate. * Reading back status flags (e.g., fault conditions). * Manually controlling the MOSFET gate. --- ### Pin Configuration (10-Lead MSOP) | Pin No. | Name | Description | | :--- | :--- | :--- | | 1 | **VCC** | Positive Supply Input (3.15 V to 16.5 V). | | 2 | **SCL** | I2C Serial Clock Input. | | 3 | **SDA** | I2C Serial Data I/O. | | 4 | **ADR** | Address Pin (Sets the I2C slave address). | | 5 | **GATE** | Gate Drive Output for external N-channel MOSFET. | | 6 | **SENSE** | Current Sense Input (connected to shunt resistor). | | 7 | **TIMER** | Sets the duration of the current-limit period. | | 8-10 | **NC/GND** | Ground and No-Connect pins for thermal/electrical stability. | --- ### Typical Application Circuit In a standard design, a **Sense Resistor** is placed between $V_{CC}$ and the $SENSE$ pin. An **N-Channel MOSFET** is placed in the power path, with its gate controlled by the ADM1175. When the board is powered, the ADM1175 slowly ramps the gate voltage to maintain a safe inrush current level.