Rainbow-electronics DS1305 Manuale Utente

1 of 20 061202FEATURES§ Real-time clock (RTC) counts seconds,minutes, hours, date of the month, month,day of the week, and year with leap-yearcompens

DS130510 of 20Figure 4. POWER SUPPLY CONFIGURATIONSConfiguration 1: Backup Supply is a Nonrechargeable Lithium BatteryConfiguration 2: Backup Supply i

DS130511 of 20SERIAL INTERFACEThe DS1305 offers the flexibility to choose between two serial interface modes. The DS1305 cancommunicate with the SPI i

DS130512 of 20Figure 5. SERIAL CLOCK AS A FUNCTION OF MICROCONTROLLER CLOCKPOLARITY (CPOL)1) CPHA bit polarity (if applicable) may need to be set acc

DS130513 of 20The address byte is always the first byte entered after CE is driven high. The most significant bit (A7) ofthis byte determines if a rea

DS130514 of 203-WIRE INTERFACEThe 3-wire interface mode operates similarly to the SPI mode. However, in 3-wire mode there is one I/Oinstead of separat

DS130515 of 20ABSOLUTE MAXIMUM RATINGS*Voltage Range on Any Pin Relative to Ground -0.5V to +7.0VStorage Temperature Range -55°C to +125°CSoldering

DS130516 of 20DC ELECTRICAL CHARACTERISTICS Over the operating range*PARAMETER SYMBOL MIN TYP MAX UNITS NOTESInput Leakage ILI-100 +500 µAOutput Leak

DS130517 of 203-WIRE AC ELECTRICAL CHARACTERISTICS Over the operating range*PARAMETER SYMBOL MIN TYP MAX UNITS NOTESVCC = 2.0V 200Data to CL

DS130518 of 20Figure 11. TIMING DIAGRAM: 3-WIRE WRITE DATA TRANSFERSPI AC ELECTRICAL CHARACTERISTICS Over the operating range*PARAMETE

DS130519 of 20Figure 12. TIMING DIAGRAM: SPI READ DATA TRANSFERFigure 13. TIMING DIAGRAM: SPI WRITE DATA TRANSFER

DS13052 of 20PIN DESCRIPTIONVCC1- Primary Power SupplyVCC2 - Backup Power SupplyVBAT - +3V Battery InputVCCIF - Interface Logic Power-Supply InputG

DS130520 of 20NOTES:1) ICC1T and ICC2T are specified with CE set to a logic 0 and EOSC bit = 0 (oscillator enabled).2) ICC1A and ICC2A are specifi

DS13053 of 20OPERATIONThe block diagram in Figure 1 shows the main elements of the serial alarm RTC. The followingparagraphs describe the function of

DS13054 of 20SDI (Serial Data Input) – When SPI communication is selected, the SDI pin is the serial data input forthe SPI bus. When 3-wire communicat

DS13055 of 20CLOCK ACCURACYThe accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the matchbetween the capacitive

DS13056 of 20Figure 2. RTC REGISTERS AND ADDRESS MAPHEX ADDRESSREAD WRITEBit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 RANGE00H 80H 0 10-SEC SEC 00–5901H 81

DS13057 of 20During each clock update, the RTC compares the Alarm 0 and Alarm 1 registers with the correspondingclock registers. When a match occurs,

DS13058 of 20STATUS REGISTER (READ 10H)BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1 BIT0000000IRQF1IRQF0IRQF0 (Interrupt 0 Request Flag) – A logic 1 in the inte

DS13059 of 20Table 2. TRICKLE CHARGER RESISTOR AND DIODE SELECTTCSBit 7TCSBit 6TCSBit 5TCSBit 4DSBit 3DSBit 2RSBit 1RSBit 0FUNCTIONX X XXXX 0 0 Disabl