DS1308U-18+

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Real time clocks (RTCs) are components that can be used to measure time and keep track of when events occur. The DS1308U-18+ is a low-power RTC module specifically designed for applications that require precise timing. It features an on-chip voltage reference and temperature-compensated oscillator circuitry, thereby eliminating the need for a large, external crystal. The DS1308U-18+ is ideal for applications such as timekeeping systems, time-stamping and user-activity tracking, thermal drift compensation, and power-saving alarms.

The DS1308U-18+ is an eight-pin device that operates over a wide voltage range of 2.2–5.5V. It contains a 32.768 kHz crystal and an integrated temperature-compensated oscillator (TCXO) circuit that provides excellent accuracy and stability. It also includes an integrated oscillator buffer, a 1-Hz counter, and a watchdog timer. The DS1308U-18+ is highly accurate and only consumes 3μA (typ) of current, making it ideal for battery-operated systems.

The DS1308U-18+ also includes a number of functions for data protection and system management. It contains an on-chip voltage reference, a watchdog timer, tamper detection, and secure boot capability. The on-chip voltage reference ensures accuracy even when power is lost, and the watchdog timer can help prevent system lock-ups. The tamper detection feature can detect hardware modifications and disable critical functions, while the secure boot capability can protect against unauthorized software modifications.

The DS1308U-18+ supports multiple communication interfaces, including I2C and SPI, allowing it to be easily integrated into existing systems. It also has an interrupt output that can be used to signal a time- or event-based interrupt. The DS1308U-18+ is available in both a leaded package and a RoHS-compliant chip format, making it suitable for a wide range of applications.

In summary, the DS1308U-18+ is an accurate, low-power RTC module specifically designed for applications that require precise timing. It includes a 32.768 kHz crystal and integrated TCXO circuitry, as well as an integrated voltage reference, watchdog timer, tamper detection, and secure boot capability. The DS1308U-18+ supports multiple communication interfaces, including I2C and SPI, and is available in both a leaded package as well as a RoHS-compliant chip format, making it an ideal choice for battery-operated systems that require accurate, real-time clock solutions.

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