Skip to main content Skip to first level navigation

RICOH imagine. change.

RICOH ELECTRONIC DEVICES CO., LTD.

Skip to main content First level navigation Menu
Main content

R2062
3-wire Serial Interface Real Time Clock (RTC) with Battery Backup Switch-over Function

Product Specifications

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.

FEATURES

Minimum Timekeeping supply voltage Typ. 0.75 V (Max. 1.00 V); VDD pin
Supply Current TYP. 0.4 µA (VDD=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 two supply voltage monitoring threshold settings
Automatic identification of leap years up to the year 2099
Selectable 12-hour and 24-hour mode settings
Built-in Circuits Backup switchover circuit (can be used for a secondary battery, or an electric double layer capacitor)
Voltage detector with delay
Oscillation stabilization capacitors (CG and CD)
High precision oscillation adjustment
Clock Output 32.768 kHz (CMOS output. “H” level is always equal to VCC.)
Package QFN023023-16

PIN DESCRIPTION

QFN023023-16

QFN023023-162.3 mm × 2.3 mm
1 CE
2 VSS
3 CIN
4 INTR
5 NC
6 OSCOUT
7 OSCIN
8 VDD
9 NC
10 VCC
11 NC
12 VDCC
13 CLKOUT
14 SCLK
15 SIO
16 NC

*) Tab is VSS level. The tab is better to be connected to the VSS.


R2062 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
R2062Lxx-E2 Consumter QFN023023-16 3,000
  • xx … Serial number of Voltage detector setting etc.

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Reliability *2
QFN023023-16 R2062L

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.

Inquiry about products

Technical Support

Inquiries (SSL Form)

Inquiry about business

Purchase, Request for Samples and Documents

Distributors

Sample Online

Online Distributors