The **ADM8642T100ACBZ-R7** is a high-precision, low-power voltage detector and supervisory circuit manufactured by Analog Devices. It is primarily used to monitor power supply levels and provide a reset signal to processors or controllers when voltage thresholds are breached. --- ### 1. Key Technical Specifications | Feature | Specification | |:---|:---| | **Threshold Voltage ($V_{TH}$)** | 1.0V (Fixed) | | **Supply Voltage ($V_{CC}$)** | 0.6V to 5.5V | | **Output Stage** | Open-Drain (Active-Low) | | **Supply Current ($I_{CC}$)** | 230 nA (Typical) | | **Package Type** | 4-ball WLCSP (Wafer Level Chip Scale Package) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Functional Details #### Power Consumption The most notable feature of this part is its **ultra-low power consumption** (230 nA). This makes it ideal for battery-powered Internet of Things (IoT) devices, wearables, and portable electronics where power conservation is critical. #### Open-Drain Output The device features an **Open-Drain** output. This requires an external pull-up resistor to a voltage source. This architecture is beneficial because: * It allows for level-shifting (interfacing the reset pin with a different voltage rail than the monitored supply). * Multiple reset sources can be "OR-ed" together on a single line. #### Threshold Accuracy The device offers a high-accuracy threshold (typically ±1.5% over temperature), ensuring that the system resets reliably before the supply voltage drops below the operating range of the connected microcontroller. --- ### 3. Pin Configuration (WLCSP) Since this is a 4-ball WLCSP package, it uses a grid layout: | Ball | Name | Function | |:---:|:---:|:---| | **A1** | $V_{DD}$ | Power Supply / Monitored Input | | **A2** | $V_{OUT}$ | Open-drain active-low reset output | | **B1** | GND | Ground | | **B2** | NC | No Connect (Leave floating) | --- ### 4. Typical Application Circuit ```mermaid graph LR VCC((Power Source)) --- VDD[ADM8642 A1] VCC --- R1[Pull-up Resistor] R1 --- VOUT[ADM8642 A2] VOUT --- MCU_Reset[Microcontroller Reset Pin] GND[GND B1] --- Ground((Ground)) ``` --- ### 5. Part Number Breakdown: `ADM8642T100ACBZ-R7` * **ADM8642**: Base model series. * **T**: Denotes the specific delay/output configuration. * **100**: Represents the 1.0V threshold voltage. * **ACBZ**: Indicates the WLCSP package type and halogen-free status. * **R7**: Indicates Tape and Reel packaging (7-inch reel).