Rainbow-electronics DS17287 Manual de usuario

1 of 38 050802FEATURESIncorporates industry standard DS1287 PC clockplus enhanced features:§ Y2K compliant§ +3V or +5V operation§ SMI recovery stac

DS17285/DS1728710 of 38REGISTER B MSB LSBBIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0SET PIE AIE UIE SQWE DM 24/12 DSESET – When the SET bit

DS17285/DS1728711 of 38REGISTER C MSB LSBBIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0IRQF PF AF UF 0 0 0 0IRQF – Interrupt Request Flag. Thi

DS17285/DS1728712 of 38NV RAM–RTCThe general-purpose NV RAM bytes are not dedicated to any special function within theDS17285/DS17287. They can be use

DS17285/DS1728713 of 38possible interrupt sources has its flag and enable bits both set. The IRQF bit in Register C is a 1 wheneverthe IRQ pin is be

DS17285/DS1728714 of 38Table 2. PERIODIC INTERRUPT RATE AND SQUARE-WAVE OUTPUTFREQUENCYEXTENDEDREGISTER BSELECT BITS REGISTER AE32k RS3 RS2 RS1 RS0tPI

DS17285/DS1728715 of 38UPDATE CYCLEThe serialized RTC executes an update cycle once per second regardless of the SET bit in Register B.When the SET bi

DS17285/DS1728716 of 38EXTENDED FUNCTIONSThe extended functions provided by the DS17285/DS17287 that are new to the RAMified RTC familyare accessed by

DS17285/DS1728717 of 38can be used to determine if and how many RTC writes have occurred since the last time this register wasread.Auxiliary BatteryTh

DS17285/DS1728718 of 38A kickstart sequence occurs when kickstarting is enabled through KSE = 1. While the system is powereddown, the KS input pin i

DS17285/DS1728719 of 38During interval 5, the system is fully powered down. Battery backup of the clock calendar and NV RAMis in effect and IRQ is t

DS17285/DS172872 of 38ORDERING INFORMATIONPART # DESCRIPTIONDS17285XX-X RTC ChipDS17287X-X RTC Module; 24-pin DIPPIN DESCRIPTIONX1 - Crystal Inpu

DS17285/DS1728720 of 38Figure 4. DS17285/DS17287 EXTENDED REGISTER BANK DEFINITIONBANK 0 BANK 1MSBDV0 = 0LSB MSBDV0 = 1LSB00 000D 0D0E 0E3F 3F40 40 MO

DS17285/DS1728721 of 38EXTENDED CONTROL REGISTERSTwo extended control registers are provided to supply controls and status information for the extende

DS17285/DS1728722 of 38EXTENDED CONTROL REGISTER 4B MSB LSBBIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0ABE E32k CS RCE PRS RIE WIE KSEABE – Auxili

DS17285/DS1728723 of 38SYSTEM MAINTENANCE INTERRUPT (SMI) RECOVERY STACKAn SMI recovery register stack is located in the extended register bank, locat

DS17285/DS1728724 of 38ABSOLUTE MAXIMUM RATINGS*Voltage Range on Any Pin Relative to Ground -0.3V to +7.0VStorage Temperature Range -40°C to +85°CSold

DS17285/DS1728725 of 38DC ELECTRICAL CHARACTERISTICS Over the operating range (5V)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESAverage VCC Power SupplyCurr

DS17285/DS1728726 of 38DC ELECTRICAL CHARACTERISTICS Over the operating range (3V)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESAverage VCC Power-SupplyCurr

DS17285/DS1728727 of 38RTC AC TIMING CHARACTERISTICS Over the operating range (3V)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESCycle Time tCYC360 DC nsPuls

DS17285/DS1728728 of 38RTC AC TIMING CHARACTERISTICS Over the operating range (5V)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESCycle Time tCYC240 DC ns

DS17285/DS1728729 of 38BUS TIMING FOR READ CYCLE TO RTC AND RTC REGISTERSBUS TIMING FOR WRITE CYCLE TO RTC AND RTC REGISTERS

DS17285/DS172873 of 38The DS17285/DS17287 power-control circuitry allows the system to be powered on by an externalstimulus such as a keyboard or by a

DS17285/DS1728730 of 38POWER-UP/POWER-DOWN TIMING, 5V (TA = +25°C)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESCS

DS17285/DS1728731 of 38POWER-UP CONDITION, 3VPOWER-DOWN CONDITION, 3V

DS17285/DS1728732 of 38POWER-UP CONDITION, 5VPOWER-DOWN CONDITION, 5V

DS17285/DS1728733 of 38WAKE-UP/KICKSTART TIMINGNote: Time intervals shown above are referenced in Wake-Up/Kickstart section.*This condition can occur

DS17285/DS1728734 of 38BURST MODE TIMING WAVEFORM NOTES:1) Typical values are at +25°C and nominal supplies.2) Outputs are open.3) W

DS17285/DS1728735 of 38DS17285 24-PIN DIPPKG 24-PINDIM MIN MAXA INMM1.24531.621.27032.25B INMM0.53013.460.55013.97C INMM0.1403.560.1604.06D INMM0.6001

DS17285/DS1728736 of 38DS17285 24-PIN SOThe chamfer on the body is optional. If it is not present, a terminal 1 identifier must be positioned so thato

DS17285/DS1728737 of 38DS17285 28-PIN TSOPPKG 28-PINDIM MIN MAXA —1.20A1 0.05 —A2 0.91 1.02b 0.18 0.27c 0.15 0.20D 13.20 13.60D1 11.70 11.90E 7.90 8.1

DS17285/DS1728738 of 38DS17287 RTC PLUS RAMNote: Pins 2, 3, 16, and 20 are missing by design.PKG 24-PINDIM MIN MAXA INMM1.32033.531.33533.91B INMM0.72

DS17285/DS172874 of 38WR – RTC Write Input; Active Low. The WR signal is an active low signal. The WR signal definesthe time period during which

DS17285/DS172875 of 38Figure 1. BLOCK DIAGRAM

DS17285/DS172876 of 38DS17285 ONLYX1, X2 – Connections for a standard 32.768kHz quartz crystal. For greatest accuracy, the DS17285 mustbe used with a

DS17285/DS172877 of 38RTC ADDRESS MAPThe address map for the RTC registers of the DS17285/DS17287 is shown in Figure 2. The address mapconsists of the

DS17285/DS172878 of 38The three time alarm bytes can be used in two ways. First, when the alarm time is written in theappropriate hours, minutes, and

DS17285/DS172879 of 38CONTROL REGISTERSThe four control registers; A, B, C, and D reside in both bank 0 and bank 1. These registers are accessibleat a