Rainbow-electronics DS1687 Bedienungsanleitung

1 of 38 080202Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any

DS1685/DS168710 of 38Figure 2. DS1685 RTC ADDRESS MAP0 00H 0 SECONDS1 SECONDS ALARM13CLOCK/CALENDAR14 BYTES0DH 2 MINUTES14 0EH 3 MINUTES ALARM6350 BYT

DS1685/DS168711 of 38generated each hour when the “don’t care” bits are set in the hours byte. Similarly, an alarm is generatedevery minute with “don’

DS1685/DS168712 of 38CONTROL REGISTERSThe four control registers A, B, C, and D reside in both bank 0 and bank 1. These registers are accessibleat all

DS1685/DS168713 of 38REGISTER BMSB 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 is a 0, t

DS1685/DS168714 of 38REGISTER CMSB LSBBIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0IQRF PF AF UF 0 0 0 0IRQF – The interrupt-request flag (IRQF) bit

DS1685/DS168715 of 38NV RAM—RTCThe 242 general-purpose NV RAM bytes are not dedicated to any special function within theDS1685/DS1687. They can be use

DS1685/DS168716 of 38When using the flag bits with fully enabled interrupts, the IRQ line is driven low when an interrupt flagbit is set and its cor

DS1685/DS168717 of 38Register B. The periodic interrupt can be used with software counters to measure inputs, create outputintervals, or await the nex

DS1685/DS168718 of 38UPDATE CYCLEThe serialized RTC executes an update cycle once per second regardless of the SET bit in Register B.When the SET bit

DS1685/DS168719 of 38EXTENDED FUNCTIONSThe extended functions provided by the DS1685/DS1687 that are new to the RAMified RTC family areaccessed by a s

DS1685/DS16872 of 38ORDERING INFORMATIONPART PIN-PACKAGEVOLTAGE(V)TOP MARK TEMP RANGEDS1685-3 24 DIP 3 DS1685-3 0°C to +70°CDS1685-5 24 DIP 5 DS1685-5

DS1685/DS168720 of 38AUXILIARY BATTERYThe VBAUX input is provided to supply power from an auxiliary battery for the DS1685/DS1687 kickstart,wake-up, a

DS1685/DS168721 of 38Up/Kickstart Timing Diagram” in the Electrical Specifications section of this data sheet. The timingassociated with these functio

DS1685/DS168722 of 38The RAM clear function is enabled or disabled by the RAM clear-enable bit (RCE; bank 1, register04BH). When this bit is set to a

DS1685/DS168723 of 38Figure 4. DS1685/DS1687 EXTENDED REGISTER BANK DEFINITION MSBBANK 0 DV0= 0LSB MSBBANK 1 DV0 =1LSB00 000DTIMEKEEPING AND CO

DS1685/DS168724 of 38EXTENDED CONTROL REGISTERSTwo extended control registers are provided to supply controls and status information for the extendedf

DS1685/DS168725 of 38EXTENDED CONTROL REGISTER 4BMSB LSBBIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0ABE E32K CS RCE PRS RIE WIE KSEABE – Auxiliary

DS1685/DS168726 of 38SYSTEM MAINTENANCE INTERRUPT (SMI) RECOVERY STACKAn SMI recovery register stack is located in the extended register bank, locatio

DS1685/DS168727 of 38ABSOLUTE MAXIMUM RATINGS*Voltage Range on Any Pin Relative to Ground 0.3V to +6VOperating Temperature Range, Commercial 0°C to

DS1685/DS168728 of 38DC ELECTRICAL CHARACTERISTICS (VCC = 5.0V±10%, TA = 0°C to +70°C, -40°C to

DS1685/DS168729 of 38DC ELECTRICAL CHARACTERISTICS (VCC = 3.0V±10%, TA = 0°C to +70°C, -40°C to

DS1685/DS16873 of 38TYPICAL OPERATING CIRCUITDESCRIPTIONThe DS1685/DS1687 is a real-time clock (RTC) designed as a successor to the industry-standardD

DS1685/DS168730 of 38RTC AC TIMING CHARACTERISTICS (VCC = 3.0V±10%, 0°C to +70°C, -40°C

DS1685/DS168731 of 38RTC AC TIMING CHARACTERISTICS (VCC = 5.0V±10%, 0°C to +

DS1685/DS168732 of 38DS1685/DS1667 BUS TIMING FOR READ CYCLE TO RTC AND RTCREGISTERSDS1685/DS1687 BUS TIMING FOR WRITE CYCLE TO RTC AND RTCREGISTERS

DS1685/DS168733 of 38POWER-UP/DOWN TIMING, 5V (TA = +25°C)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESCS High to Power-FailtPF0nsRecovery at Power-Up tRE

DS1685/DS168734 of 38POWER-UP CONDITION, 3VPOWER-DOWN CONDITION, 3VCS VIHtREC2.7V2.6V2.5VVCCPOWER FAILtRCSPOWER FAILVCCVIHtPFtF2.7V2.6V2.5V

DS1685/DS168735 of 38POWER-UP CONDITION, 5VPOWER-DOWN CONDITION, 5VCS VIHtREC4.5V4.25V4.0VVCCPOWER FAILtRPOWER FAILVCCCSVIHtPFtF4.5V4.25V4.0V

DS1685/DS168736 of 38WAKE-UP/KICKSTART TIMING*This condition can occur with the 3V device.Note: Time intervals shown above are referenced in Wake-Up/K

DS1685/DS168737 of 38NOTES:1) All voltages are referenced to ground.2) Typical values are at +25°C and nominal supplies.3) Outputs are open.4) Wri

DS1685/DS168738 of 38DS1687 REAL-TIME CLOCK PLUS RAMNote: Pins 2, 3, 16, and 20 are missing by design.24-PIN PACKAGEDIM MIN MAXA IN.MM1.32033.531.3353

DS1685/DS16874 of 38SIGNAL DESCRIPTIONSGND, VCC – DC power is provided to the device on these pins. VCC is the +3V or +5V input.SQW (Square-Wave Outpu

DS1685/DS16875 of 38set. To clear the IRQ pin, the application software must clear all enabled flag bits contributing to IRQ ’sactive state.When no

DS1685/DS16876 of 38VBAT – Battery input for any standard 3V lithium cell or other energy source. Battery voltage must beheld between 2.5V and 3.7V fo

DS1685/DS16877 of 38Figure 1. BLOCK DIAGRAM

DS1685/DS16878 of 38OSCILLATOR STARTUP TIMEOscillator startup times are highly dependent upon crystal characteristics and layout. High ESR andexcessiv

DS1685/DS16879 of 38POWER-DOWN/POWER-UP CONSIDERATIONSThe RTC function continues to operate, and all of the RAM, time, calendar, and alarm memory loca