The **AB-RTC-TH** is an ultra-low power Real-Time Clock (RTC) module produced by Abracon. It is specifically designed for high-accuracy timekeeping and environmental sensing in compact electronic applications. Below is an overview of its electronic characteristics and components. --- ## 1. Core Technical Specifications The AB-RTC-TH integrates a specialized IC and a tuning fork crystal into a single package. | Parameter | Value/Range | | :--- | :--- | | **Supply Voltage (Vcc)** | 1.5V to 5.5V | | **Current Consumption** | ~450 nA (at 3V, Typical) | | **Communication Interface** | I²C (Fast Mode: 400 kHz) | | **Operating Temperature** | -40°C to +85°C | | **Frequency Stability** | ±5 ppm to ±20 ppm (Model dependent) | | **Package Size** | Compact SMD (e.g., 3.2 x 2.5 mm) | --- ## 2. Key Electronic Features ### A. Integrated Sensor Functionality Unlike standard RTCs, the "-TH" suffix often denotes **Temperature and Humidity** sensing capabilities. * **Temperature Compensation:** The internal oscillator adjusts for frequency drift caused by temperature changes. * **Environmental Data:** It provides digital output for ambient humidity and temperature, reducing the need for external sensors. ### B. Power Management * **Battery Backup Switchover:** Automatically switches to a backup power source (like a CR2032 or Supercapacitor) when the main Vcc fails. * **Trickle Charger:** Includes an internal programmable resistor to charge a backup capacitor. ### C. Timekeeping Registers The internal register map tracks: * Seconds, Minutes, Hours * Days, Weekdays, Months, Years * Leap year compensation up to the year 2099. --- ## 3. Pinout and Connection Diagram In a typical circuit, the AB-RTC-TH requires minimal external components, usually just decoupling capacitors and pull-up resistors for the I²C bus. ```cpp // Typical I2C Hardware Connection [MCU] [AB-RTC-TH] SDA <-----------> SDA (Serial Data) SCL <-----------> SCL (Serial Clock) GND <-----------> VSS (Ground) VCC <-----------> VDD (1.8V - 5.5V) INT <----------- IRQ (Interrupt Output) ``` --- ## 4. Primary Use Cases 1. **IoT Devices:** Where battery life must extend for years. 2. **Smart Agriculture:** Monitoring soil or air conditions while keeping a precise time log. 3. **Industrial Data Loggers:** Stamping environmental data with high-precision time. 4. **Wearables:** Due to its small form factor and low power draw.