RS5C348 Series
4-wire Serial Interface Real Time Clock (RTC)
Description
The Rx5C348 are CMOS real-time clock ICs connected to the CPU by four signal lines, CE, SCLK, SI, SO, 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. 0.35 µA at 3V: Rx5C348A, TYP. 0.55 µA at 3V: Rx5C348B). 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 (N-channel open drain output) is intended to output sub-clock pulses for the external microcomputer. The 32-kHz clock circuit can be disabled by certain register settings for the Rx5C348A but cannot be disabled by any register settings for the Rx5C348B. The oscillation adjustment circuit is intended to adjust time counts with high precision by correcting deviations in the oscillation frequency of the crystal oscillator. SSOP10 and SSOP10G packages are available.
Related Product
Spec
| Timekeeping Supply Voltage Range | 1.45 V to 5.50 V | ||
| Supply Current | 0.35 µA (VDD = 3 V) | ||
| Connection to CPU | Four Signal Lines (SCLK, SI, SO, CE), Serial Interface, Maximum Clock Frequency: 2 MHz (VDD = 5 V) | ||
| Clock Output | 32.768 kHz Nch Open Drain Output Controllable by Command |
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| Package | SSOP10 | ||
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 |
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Functional Description
| ECO | ECO Function |
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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 |
Technical Documents
Quality & Packages
- Refer to the datasheets for the details on the product.
- The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
FAQ
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