BL5372

BL5372 is a low-power real-time clock IC that communicates with a CPU in real time via an I2C two-wire interface, designed for use in any system requiring a time base. The device can generate multiple periodic interrupt pulses (with a maximum period of up to 1 month) and features two alarm systems. BL5372 integrates an internal low-power voltage regulator, enabling the oscillator to maintain normal operation at very low power consumption even under harsh environmental conditions (typical: 400nA@3.6V). BL5372 incorporates an oscillator stop detection latch function; by monitoring this bit, the validity of internal clock data can be verified. BL5372 features a built-in digital time trimming circuit to ensure high-accuracy timekeeping, with two crystal selection modes: 32KHz and 32.768KHz. This product is fully compatible with the Ricoh RS5C372A.

Key features

• Ultra-low power consumption (typical 400nA@3.6V)
• Real-time clock (12-hour or 24-hour format)
• Automatic leap year / common year recognition (2000~2099)
• BCD-coded timekeeping (hours, minutes, seconds) and perpetual calendar (leap year, common year, month, date, day of week)
• 30-second digital time calibration
• Controllable 32.768KHz (or 32KHz) output
• Two programmable alarm outputs
• Two programmable square wave outputs providing multiple CPU interrupts (periodic interrupts from 1 month to 1 second)
• I2C two-wire interface to CPU (max data clock frequency 100KHz)
• Crystal oscillator stop detection latch ensures clock data validity
• 32KHz and 32.768KHz crystal selection
• High-precision time trimming circuit ensures accurate timekeeping
• Ultra-low voltage operation (minimum timekeeping voltage 1.8V, minimum communication voltage 1.8V)
• SOP8 or TSSOP8 package