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R2061
3 wire interface Real-Time Clock ICs with Battery Backup switch-over Function

Product Specifications

The R2061 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. 0.4µA 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 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 primary or secondary battery. Switchover is executed by monitoring the voltage of a main power supply, therefore the voltage of a backup battery voltage is not relevant. Since the package for these ICs is SSOP16 and QFN023023-16, high density mounting of ICs on boards is possible.

FEATURES

Minimum Timekeeping supply voltage TYP. 0.75 V
Supply Current TYP. 0.4 µA
Connected to the CPU Three signal lines (CE, SCLK, and SIO), Maximum clock frequency of 1MHz (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 primary battery, a secondary battery, or an electric double layer capacitor)
Voltage detector with delay
Oscillation stabilization capacitors (CG and CD)
High precision oscillation adjustment circuit
Packages SSOP16, QFN023023-16

BLOCK DIAGRAM

PIN DESCRIPTION

SSOP16

SSOP165.0 mm × 6.4 mm
1 NC
2 VSB
3 VDCC
4 SCLK
5 SIO
6 NC
7 CE
8 VSS
9 CIN
10 INTR
11 NC
12 OSCOUT
13 OSCIN
14 NC
15 VDD
16 VCC

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 VSB
13 VDCC
14 SCLK
15 SIO
16 NC

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


R2061 Series for Consumer

APPLICATIONS

  • Communication devices (multi function phone, portable phone, PHS or pager)
  • OA devices (fax, portable fax)
  • Computer (desk-top and mobile PC, portable word-processor, PDA, electric note or video game)
  • AV components (portable audio unit, video camera,camera, digital camera or remote controller)
  • Home appliances (rice cooker, electric oven)
  • Other (car navigation system, multi-function watch) navigation

PRODUCT LONGEVITY PROGRAM

R2061S series operate PRODUCT LONGEVITY PROGRAM (ten-year supply is maintained as of January, 2016).
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


SELECTION GUIDE

In the R2061 Series, the package and the output voltage can be designated.

Product Name   Package Quantity per Reel
R2061Lxx-E2 Consumter QFN023023-16 3,000
R2061S02-E2-F ConsumterPLP SSOP16 2,000
  • xx … Serial number of Voltage detector setting etc.

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Reliability *2
QFN023023-16 R2061L
SSOP-16 R2061S

*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.

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