PT7C4372A

Product Description

PT7C4372A/C are I2C bus interface-compliant real-time clocks that have been adjusted for high precision. In addition to providing a function for generating six types of interrupts, a dual alarm function, an oscillation stop detection function (used to determine presence of valid internal data at power-on), they includes a digital clock precision adjustment function that can be used to set various levels of precision. Since the internal oscillation circuit is driven at a constant voltage, 32-kHz clock output is stable and free of voltage fluctuation effects. Table 1 shows the diverse functions of the two RTC circuits. More details are shown in section Overview of functions.

Product Features

• External quartz oscillator 32.000kHz and 32.768kHz selectable.
• Supports I2C-Bus's high speed mode (400 kHz)
• Includes time (Hour/Minute/Second) and calendar (Year/Month/Date/Day) counter functions (BCD code)
• Select between 12-hr and 24-hr clock display
• Auto calculation of leap years until 2099
• Built-in high-precision clock precision control logic
• Interrupt generation function (cycle time range: 1 month to 0.5 seconds, includes interrupt flags and interrupt stop function)
• Alarm functions (Alarm_A: Day/Hour/Min)
• 32-kHz clock output (/INTB output)
• Oscillation stop detection function (used to determine presence of internal data)
• Wide Time keeping voltage range: 1.3 V to 6 V
• Wide interface voltage range: 1.8 V to 6 V
• Low current consumption: 0.4 μA/3.0 V (Typ.)