PDF RS5C321A Data sheet ( Hoja de datos )

Número de pieza	RS5C321A
Descripción	ULTRA-COMPACT SERIAL REAL-TIME CLOCK ICs WITH 32.768kHz
Fabricantes	RICOH electronics devices division
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No Preview Available ! www.DataSheet4U.com ULTRA-COMPACT SERIAL REAL-TIME CLOCK ICs WITH 32.768kHz RS5C321A/B APPLICATION MANUAL DataSheet4U.com DataShee DataSheet4U.com ELECTRONIC DEVICES DIVISION NO.EA-040-9908 1 page www.DataSheet4U.com URTRA-COMPACT ALARM REAL-TIME CLOCK ICs WITH 32.768kHz RS5C321A/B OUTLINE The RS5C321A/B are CMOS type real-time clock ICs which are connected to the CPU via three signal lines and capable of serial transmission of clock and calendar data to the CPU. The RS5C321A/B can generate 32.768kHz clock pulse controled by register. Driving an oscillation circuit at con- stant voltage, the circuit presents less fluctuations in frequency and current consumption thank to its minimal volt- age fluctuations consequently realizes low current consumption (0.6µA at 3V). It also provides an oscillator halt sensing function for application to data validity at power-on and other occasions. Integrated into an ultra compact and ultra thin 8pin SSOP (0.65mm pitch), the RS5C321A/B are the optimum choice for equipment requiring small size and low power consumption. The RS5C321A and the RS5C321B reads/writes data at falling and rising edge of serial clock respectively. et4U.com FEATURES DataShee • Time keeping voltage 1.6V to 6.0V • Lowest supply current 0.6µA TYP. (1.5µA MDAaXta.)Sahte3eVt4U.com • Connection to the CPU via only three pins: CE, SCLK/SCLK and SIO for addressing and data read/write • A clock counter (counting hours, minutes, and seconds) and a calendar counter (counting leap years, years, months, days, and days of the week) in BCD code • 32.768kHz clock pulse controled by register. • Oscillator halt sensing to judge internal data validity • Second digit adjustment by ±30 seconds • 12-hour or 24-hour time display selectable • Automatic leap year recognition up to the year 2099 • CMOS logic • Package: 8pin SSOP (0.65mm pitch) DataSheet4U.com 1 5 Page www.DataSheet4U.com RS5C321A/B et4U.com FUNCTIONAL DESCRIPTIONS 1. Addressing A3 00 10 20 30 40 50 60 70 81 91 A1 B1 C1 D1 E1 F1 Address A2 A1 00 00 01 01 10 10 11 11 00 00 01 01 10 10 11 11 Registers A0 0 1-second counter (BANK=0) D3 S8 Data 1 D2 D1 S4 S2 D0 S1 1 10-second counter (BANK=0) —2 S40 S20 S10 0 1-minute counter (BANK=0) M8 M4 M2 M1 1 10-minute counter (BANK=0) — M40 M20 M10 0 1-hour counter (BANK=0) H8 H4 H2 H1 1 10-hour counter (BANK=0) — — P/A, H20 H10 0 Day of the week counter (BANK=0) — W4 W2 W1 1 Scratch register8 (BANK=0, 1) Scratch8 Scratch8 Scratch8 Scratch8 0 1-day counter (BANK=0) D8 D4 D2 D1 1 10-day counter (BANK=0) 1-month counter 0 (BANK=0) 32kHz clock pulse control register (BANK=1) 1 10-month counteDrataSheet4U.com(BANK=0) — MO8 — — — MO4 — — D20 MO2 — — D10 MO1 DataShee CLEN7 MO10 0 1-year counter (BANK=0) Y8 Y4 Y2 Y1 1 10-year counter 0 Control register 1 1 Control register 2 (BANK=0) (BANK=0, 1) (BANK=0, 1) Y80 — 12/24 Y40 Y20 Y10 — WTEN6/XSTP4 ADJ/BSY 3 — BANK 5 TEST 6 1) All the listed data can be read and written. 2) The “—” mark indicates data which can be read only and set to “0” when read. 3) The ADJ/BSY bit of the control register is set to ADJ for write operation and BSY for read operation. 4) The WTEN/XSTP bit of the control register is set to WTEN for write operation and XSTP for read operation. 5) The clock/calendar counter and the 32kHz clock pulse control register can be selected when the BANK=0 and BANK=1 respectively. To designate the BANK is unnecessary for scratch register and control register 1/2. 6) The WTEN bit and TEST bit are set to “1” when CE is “L”. 7) The CLEN bit is set to 0, when initial power-on or XSTP is set to 1. *8) Data may be written and read into/from the Scratch register, which actually is not used. DataSheet4U.com 7 11 Page

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Número de pieza	Descripción	Fabricantes
RS5C321A	ULTRA-COMPACT SERIAL REAL-TIME CLOCK ICs WITH 32.768kHz	RICOH electronics devices division
RS5C321B	ULTRA-COMPACT SERIAL REAL-TIME CLOCK ICs WITH 32.768kHz	RICOH electronics devices division

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