1 of 21 061202FEATURES§ Real-time clock (RTC) counts seconds,minutes, hours, date of the month, month,day of the week, and year with leap-yearcompens

DS130610 of 21Figure 4. POWER SUPPLY CONFIGURATIONSConfiguration 1: Backup Supply is a Nonrechargeable Lithium BatteryConfiguration 2: Backup Supply i

DS130611 of 21SERIAL INTERFACEThe DS1306 offers the flexibility to choose between two serial interface modes. The DS1306 cancommunicate with the SPI i

DS130612 of 21Figure 5. SERIAL CLOCK AS A FUNCTION OF MICROCONTROLLERCLOCK POLARITY (CPOL)1) CPHA bit polarity in the processor (if applicable) may n

DS130613 of 21The address byte is always the first byte entered after CE is driven high. The most significant bit (A7) ofthis byte determines if a rea

DS130614 of 213-WIRE INTERFACEThe 3-wire interface mode operates similar to the SPI mode. However, in 3-wire mode there is one I/Oinstead of separate

DS130615 of 21ABSOLUTE MAXIMUM RATINGS*Voltage Range on Any Pin Relative to Ground -0.5V to +7.0VStorage Temperature Range -55°C to +125°CSoldering Te

DS130616 of 21DC ELECTRICAL CHARACTERISTICS (Over the operating range*)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESInput Leakage ILI-

DS130617 of 213-WIRE AC ELECTRICAL CHARACTERISTICS (Over the operating range*)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESVCC = 2.0V 200Data to CL

DS130618 of 21Figure 10. TIMING DIAGRAM: 3-WIRE READ DATA TRANSFERFigure 11. TIMING DIAGRAM: 3-WIRE WRITE DATA TRANSFER

DS130619 of 21SPI AC ELECTRICAL CHARACTERISTICS (Over the operating range*)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESVCC = 2.0V 200Data to

DS13062 of 21PIN DESCRIPTIONVCC1 - Primary Power SupplyVCC2 - Backup Power SupplyVBAT - +3V Battery InputVCCIF - Interface Logic Power-Supply Input

DS130620 of 21Figure 12. TIMING DIAGRAM: SPI READ DATA TRANSFERFigure 13. TIMING DIAGRAM: SPI WRITE DATA TRANSFERSCLK can be either polarity, timing s

DS130621 of 21NOTES:1) ICC1T and ICC2T are specified with CE set to a logic 0.2) ICC1A and ICC2A are specified with CE = VCC, SCLK = 2MHz at VCC = 5

DS13063 of 21OPERATIONThe block diagram in Figure 1 shows the main elements of the serial alarm RTC. The followingparagraphs describe the function of

DS13064 of 21SDO (Serial Data Output) – When SPI communication is selected, the SDO pin is the serial data outputfor the SPI bus. When 3-wire communic

DS13065 of 21CLOCK ACCURACYThe accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the matchbetween the capacitive

DS13066 of 21Figure 2. RTC REGISTERS AND ADDRESS MAPHEX ADDRESSREADWRITEBit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 RANGE00H 80H 0 10 SEC SEC 00–5901H 81H

DS13067 of 21During each clock update, the RTC compares the Alarm 0 and Alarm 1 registers with the correspondingclock registers. When a match occurs,

DS13068 of 21active-high pulse. IRQF1 is cleared when the address pointer goes to any of the alarm 1 registers during aread or write. IRQF1 is activat

DS13069 of 21Table 2. TRICKLE CHARGER RESISTOR AND DIODE SELECTTCSBit 7TCSBit 6TCSBit 5TCSBit 4DSBit 3DSBit 2RSBit 1RSBit 0FUNCTIONX X XXXX 0 0 Disabl