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R2221T-E2-F +BOM

TSSOP-10-2.8mm Real-time Clocks (RTC) ROHS

Manufacturer:

Nisshinbo Micro Devices Inc
Mfr.Part #:

R2221T-E2-F
Datasheet:

R2221T-E2-F Datasheet (PDF)
Logic Function:

Clock
EDA/CAD Models:

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R2221T-E2-F General Description

The R2221x, R2223x is a CMOS real-time clock IC connected to the CPU by two signal lines, SCL, SDA, and configured to perform serial transmission of time and calendar data to the CPU. The periodic interrupt circuit is configured to generate interrupt signals with six selectable interrupts ranging from 0.5 seconds to 1 month. The 2 alarm interrupt circuits generate interrupt signals at preset times. As the oscillation circuit is driven under constant voltage, fluctuation of the oscillator frequency due to supply voltage is small, and the time keeping current is small (TYP. 0.18µA at 3V).

Key Features

• Minimum Timekeeping supply voltage TYP:0.6 to 5.5v (Worst: 0.9V to 5.5v); VDD pin
• Ultra low power consumption 0.18µA TYP at VDD=3V (0.65µA MAX.)
• Two signal lines (SCL, SDA) required for connection to the CPU.
• Time counters (counting hours, minutes, and seconds) and calendar counters (counting years, months, days, and
weeks) (in BCD format)
• Interrupt circuit configured to generate interrupt signals (with interrupts ranging from 0.5 seconds to 1 month) to
the CPU and provided with an interrupt flag and an interrupt halt
• 2 alarm interrupt circuits (Alarm_W for week, hour, and minute alarm settings and Alarm_D for hour and minute
alarm settings)
• With Power-on flag to prove that the power supply starts from 0V
• 32-kHz clock output pin (CMOS push-pull output with control pin)
• Supply voltage monitoring circuit with supply voltage monitoring threshold settings
• Automatic identification of leap years up to the year 2099
• Selectable 12-hour and 24-hour mode settings
• High precision oscillation adjustment circuit
• Built-in oscillation stabilization capacitors (CG and CD)
• Package TSSOP10G (4.0mm x 2.9mm x 1.0mm: R2221T, R2223T)
QFN018018-12 (1.8mm x 1.8mm x 0.43mm: R2221L, R2223L)
• CMOS process