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About RICOH Electronic Devices
R2262
3-wire Serial Interface Real Time Clock (RTC) with Battery Backup Switch-over Function
Product Specifications
The R2262 is a CMOS real-time clock IC connected to the CPU by three signal lines, CE, SCLK, SIO, and configured to perform serial transmission of time and calendar data to the CPU. Further, battery backup switchover circuit and a voltage detector are incorporated for secondary battery. 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. 0.30 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 supply voltage monitoring threshold setting. 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 crystal oscillator. 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 this IC is TSSOP10G or QFN0202-18, high density mounting of ICs on boards is possible.
FEATURES
| Minimum Timekeeping supply voltage | Typ. 0.6 V to 5.5 V (Worst: 0.9 V to 5.5 V); BAT pin |
|---|---|
| Supply Current | Typ. 0.30 µA (VBAT = 3V) |
| Connected to the CPU | Three signal lines (CE, SCLK, and SIO), Maximum clock frequency of 1 MHz (with VCC = 3V) |
| Functions | 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 | |
| Supply voltage monitoring circuit with supply voltage monitoring threshold setting | |
| Automatic identification of leap years up to the year 2099 | |
| Selectable 12-hour and 24-hour mode settings | |
| Built-in Circuits | Backup switchover (can be used for a secondary battery, or an electric double-layer capacitor) |
| Voltage detector with delay | |
| High precision oscillation adjustment | |
| Oscillation stabilization capacitors (CG and CD) | |
| Clock Output | 32-kHz (CMOS push-pull output. “H” level is always equal to VCC.) |
| Packages | QFN0202-18, TSSOP10G |
PIN DESCRIPTION
QFN0202-18
2.0 mm × 2.0 mm| 1 | (TAB) |
| 2 | CE |
| 3 | VSS |
| 4 | VDCC |
| 5 | (TAB) |
| 6 | INTR |
| 7 | (VSS) |
| 8 | OSCOUT |
| 9 | OSCIN |
| 10 | (TAB) |
| 11 | VRG |
| 12 | VCC |
| 13 | BAT |
| 14 | (TAB) |
| 15 | CLKOUT |
| 16 | SCLK |
| 17 | SIO |
| 18 | (VSS) |
*) Tab is VSS level. The tab is better to be connected to the VSS.
TSSOP10G
2.9 mm × 4.0 mm| 1 | BAT |
| 2 | SCLK |
| 3 | SIO |
| 4 | CE |
| 5 | VSS |
| 6 | VDCC |
| 7 | OSCOUT |
| 8 | OSCIN |
| 9 | VRG |
| 10 | VCC |
R2262 for Consumer
APPLICATIONS
- Home appliances such as refrigerators, rice cookers, and electric pots
- Digital appliances such as laptops, digital TVs, DSCs, camcorders, mobile phones, and private LAN system
- Office appliances such as copiers, printers, facsimiles, scanners, and projectors
SELECTION GUIDE
| Product Name | Package | Quantity per Reel | |
|---|---|---|---|
| R2262L01-E2 |  |
QFN0202-18 | 3,000 |
| R2262T01-E2-F | |
TSSOP10G | 2,000 |
DOCUMENT/CONTACT
| Package *1 | Reliability *2 |
|---|---|
| QFN0202-18 | R2262L |
| TSSOP10G | R2262T |
*1: The package file includes package dimensions, taping specifications, taping reels dimensions.
*2: Reliability file includes a reliability test report and a reflow profile.
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