3 wire interface Real-Time Clock ICs R2033K/T
50Pages

R2033K/T 3 wire interface Real-Time Clock ICs NO.EA-120-070221 OUTLINE The R2033K/T 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. 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. 0.45µA 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 32.768kHz clock output function (CMOS output with control pin) 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. Since the package for these ICs are TSSOP10G (4.0x2.9x1.0: R2033T) or FFP12 (2.0x2.0x1.0: R2033K), high density mounting of ICs on boards is possible. FEATURES • Minimum Timekeeping supply voltage TYP:0.66 to 5.5v (Worst: 1.00V to 5.5v); VDD pin • Low power consumption 0.45µA TYP at VDD=3V (1.00µA MAX.) • Three signal lines (CE, SCLK, SIO) required for connection to the CPU. (Maximum clock frequency of 1MHz (with VDD = 3V) ) • 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 • 32-kHz clock output pin (CMOS push-pull output with control pin) • 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 • High precision oscillation adjustment circuit • Built-in oscillation stabilization capacitors (CG and CD) • Package TSSOP10G (4.0mm x 2.9mm x 1.0mm: R2033T) FFP12 (2.0mm x 2.0mm x 1.0mm: R2033K) • CMOS process

OSCIN OSCOUT BLOCK DIAGRAM COMPARATOR_W DIVIDER CORREC -TION ALARM_W REGISTER (MIN,HOUR, WEEK) ALARM_D REGISTER (MIN,HOUR) TIME COUNTER (SEC,MIN,HOUR,WEEK,DAY,MONTH,YEAR) VOLTAGE DETECT POWER_ON RESET VSS ADDRESS DECODER INTERRUPT CONTROL ADDRESS REGISTER SHIFT REGISTER SELECTION GUIDE Part Number is designated as follows: R2033K-E2 ←Part Number ↑↑ R2033a-cc Code a bb Description Designation of the package. K: FFP12 T: TSSOP10G Designation of the taping type. Only E2 is available.

Item Chip enable Input Serial Clock Input Serial Input / Output Interrupt Output Clock Control OSCIN OSCOUT Oscillation Circuit Input / Output Positive/Negative Power Supply Input Description The CE pin is used for interfacing with the CPU. Should be held high to allow access to the CPU. Incorporates a pull-down resistor. Should be held low or open when the CPU is powered off. Allows a maximum input voltage of 5.5v regardless of supply voltage. The SCLK pin is used to input clock pulses synchronizing the input and output of data to and from the SIO pin. Allows a maximum input voltage of...

ABSOLUTE MAXIMUM RATINGS (VSS=0V) Symbol Item VDD Supply Voltage VI Input Voltage 1 Input Voltage 2 VO Output Voltage 1 Output Voltage 2 PD Power Dissipation Topt Operating Temperature Tstg Storage Temperature Pin Name VDD CE, SCLK, CLKC SIO SIO, 32KOUT INTR Topt = 25°C RECOMMENDED OPERATING CONDITIONS Symbol Vaccess Item Supply Voltage Time keeping Voltage Minimum Time keeping Voltage Oscillation Frequency Pull-up Voltage Pin Name Power supply voltage for interfacing with CPU CGout,CDout=0pF *1), *2) CGout,CDout=0pF *1), *2) kHz 5.5 V VDD +0.3 *1) CGout is connected between OSCIN and VSS,...

(Unless otherwise specified: VSS=0V, VDD=3.0V, Topt=-40 to +85°C, Crystal oscillator 32768Hz,CL=7pF,R1=50kΩ) Symbol Item Pin Name Conditions Min. Typ. “H” Input Voltage VIH1 CE, SCLK, VDD=1.7 to 5.5V 0.8x CLKC VDD VIH2 SIO 0.8x VDD -0.3 VIL “L” Input Voltage CE, SCLK, CLKC, SIO IOH “H” Output SIO, VOH=VDD-0.5V Current 32KOUT VOL=0.4V 2.0 IOL1 “L” Output INTR Current 0.5 IOL2 SIO, 32KOUT IIL Input Leakage SCLK VI=5.5V or VSS -1.0 Current VDD=5.5V RDNCE Pull-down Resistance CE 40 120 ICLKC Pull-down Resister CLKC VI=5.5V 0.30 Input Leakage Current IOZ1 SIO VO=5.5V or VSS -1 Output Off-state...

AC ELECTRICAL CHARACTERISTICS Unless otherwise specified: VSS=0V,Topt=-40 to +85°C Input and Output Conditions: VIH=0.8×VDD,VIL=0.2×VDD,VOH=0.8×VDD,VOL=0.2×VDD,CL=50pF Sym Item CondiVDD≥1.7V -bol Tions Min. Typ. Max. tCES CE Set-up Time 400 tCEH CE Hold Time 400 tCR CE Recovery Time 62 fSCLK SCLK Clock Frequency 1.0 tCKH SCLK Clock ”H” Time 400 tCKL SCLK Clock ”L” Time 400 tCKS SCLK Set-up Time 200 tRD Data Output Delay Time 300 tRZ Data Output Floating Time 300 tCEZ Data Output Delay Time After 300 Falling of CE tDS Input Data Set-up Time 200 tDH Input Data Hold Time 200 Time tDELAY Output...

(BOTTOM VIEW) 0.17±0.1 0.27±0.15 2.0±0.1 unit: mm

TAPING SPECIFICATION The R2033K/T have one designated taping direction. The product designation for the taping components is "R2033K/T-E2".

GENERAL DESCRIPTION • The R2033K/T is connected to the CPU by three signal lines CE (Chip Enable), SCLK (Serial Clock), and SIO (Serial Input and Output), through which it reads and writes data from and to the CPU. The CPU can be accessed when the CE pin is held high. Access clock pulses have a maximum frequency of 1 MHz allowing high-speed data transfer to the CPU. Clock and Calendar Function The R2033K/T reads and writes time data from and to the CPU in units ranging from seconds to the last two digits of the calendar year. The calendar year will automatically be identified as a leap year...