## ADM1026JSTZ-R7: Overview and Technical Specifications The **ADM1026JSTZ-R7** is a complete system hardware monitor designed for use in servers, workstations, and high-performance proprietary systems. Manufactured by Analog Devices (onsemi), it is highly integrated, combining thermal management, voltage monitoring, and fan control into a single chip. --- ### 1. Key Internal Components The device functions as a data acquisition system. Below are the primary electronic functional blocks: | Feature | Description | | :--- | :--- | | **ADC (Analog-to-Digital Converter)** | A 10-bit Sigma-Delta ADC used to convert analog voltage and temperature readings into digital data. | | **Temperature Sensors** | Includes one internal sensor and inputs for up to two external remote thermal diodes (e.g., inside a CPU). | | **Voltage Monitors** | Features 17 voltage measurement channels to monitor various power rails (e.g., 12V, 5V, 3.3V, Vccp). | | **Fan Control** | 8 dedicated fan speed monitoring inputs (Tachometer) and 2 PWM/DAC outputs for speed control. | | **GPIOs** | 8 General Purpose I/O pins that can be configured for various logic functions or interrupts. | | **Communication Interface** | Uses a standard 2-wire SMBus/I2C compatible serial interface. | --- ### 2. Detailed Pinout & Packaging The "JSTZ" suffix indicates the package type and environmental compliance. * **Package Type:** 48-lead LQFP (Low-profile Quad Flat Pack). * **RoHS Status:** Lead-free and compliant with environmental standards. * **Tape and Reel:** The "R7" suffix indicates the part is delivered in a 7-inch tape and reel format (usually 1,000 units). --- ### 3. Electrical Characteristics These parameters are critical for hardware integration: | Parameter | Value/Range | | :--- | :--- | | **Supply Voltage (Vcc)** | 3.0 V to 5.5 V | | **Temperature Accuracy** | ±1°C (Internal), ±3°C (Remote) | | **Operating Temperature** | 0°C to +100°C | | **Supply Current** | ~2.5 mA (Active mode) | | **ADC Resolution** | 10 Bits | --- ### 4. Typical Application Circuit In a typical server motherboard environment, the ADM1026 acts as a "Watchdog": 1. **Thermal Monitoring:** It measures the heat of the processor and ambient air. 2. **Logic Processing:** If a threshold is exceeded, the internal logic triggers an **SMBALERT#** interrupt. 3. **Active Cooling:** The system responds by increasing the PWM duty cycle to speed up the chassis fans. 4. **Voltage Safety:** It ensures that power rails do not fluctuate beyond ±5% or ±10% limits, preventing hardware damage. ---