3-wire Serial Interface Real Time Clock (RTC) with Battery Backup Switch-over Function
The R2062 is a CMOS real-time clock IC connected to the CPU by three signal lines, CE, SCLK, and SIO, and configured to perform serial transmission of time and calendar data to the CPU. Further, battery backup switchover circuit and a voltage detector. 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. 0.4 µA at 3V). The oscillation halt sensing circuit can be used to judge the validity of internal data in such events as power-on; The supply voltage monitoring circuit is configured to record a drop in supply voltage below two selectable supply voltage monitoring threshold settings. The 32.768 kHz clock output function (CMOS output) is intended to output sub-clock pulses for the external microcomputer. The oscillation adjustment circuit is intended to adjust time counts with high precision by correcting deviations in the oscillation frequency of the quartz crystal unit. Battery backup switchover function is the automatic switchover circuit between a main power supply and a backup battery of secondary battery. Since the package for these ICs are QFN023023-16, high density mounting of ICs on boards is possible.
Timekeeping Supply Voltage Range 1.0 V to 5.5 V Minimum Timekeeping Supply Voltage Typ. 0.75 V Supply Current Typ. 0.4 µA (VDD = 3 V) Connection to CPU Three Signal Lines (CE, SCLK, SIO), Maximum Clock Frequency: 1 MHz Clock Output 32.768 kHz (CMOS Output with Level Shifter) Package QFN023023-16 Backup Switchover Voltage 2.7 V, 2.9 V
Protections / Functions
ECO Clock Adjust OSC Halt Sensing Supply Voltage Monitoring Circuit Automatic Identification of Leap Years Selectable 12-hour and 24-hour Backup Switch
- Refer to the datasheets for the details on the product.
- The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
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|Clock Adjust||Clock Adjust Function|
|OSC Halt Sensing||OSC Halt Sensing Function|
|Supply Voltage Monitoring Circuit||Supply Voltage Monitoring Function|
|Automatic Identification of Leap Years||Automatic Identification of Leap Years|
|Selectable 12-hour and 24-hour||Selectable 12-hour and 24-hour|
|Built-in VD with Delay Time||Built-in VD with Delay Time|