Rainbow-electronics DS1543 Instrukcja Użytkownika

1 of 17 081000FEATURES Integrated NV SRAM, real time clock, crystal,power-fail control circuit and lithium energysource Clock registers are access

DS154310 of 17DC ELECTRICAL CHARACTERISTICS (VCC = 3.3V ± 10%)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESActive Supply Current ICC10 30 mA 2, 3TTL Standb

DS154311 of 17READ CYCLE, AC CHARACTERISTICS (VCC = 5.0V ±10%)70 ns access 100 ns accessPARAMETER SYMBOLMIN MAX MIN MAXUNITS NOTESRead Cycle Time tRC

DS154312 of 17WRITE CYCLE, AC CHARACTERISTICS (VCC = 5.0V ±10%)70 ns access 100 ns accessPARAMETER SYMBOLMIN MAX MIN MAXUNITS NOTESWrite Cycle Time t

DS154313 of 17WRITE CYCLE TIMING, WRITE ENABLE CONTROLLED Figure 6WRITE CYCLE TIMING, CHIP ENABLE CONTROLLED Figure 7

DS154314 of 17POWER-UP/DOWN CHARACTERISTICS (VCC = 5.0V ±10%)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESCE or WE at VIH , BeforePower-DowntPD0µsVCC F

DS154315 of 17POWER-UP/DOWN CHARACTERISTICS (VCC = 3.3V ±10%)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESCE or WE at VIH , BeforePower-DowntPD0µsVCC F

DS154316 of 17AC TEST CONDITIONSOutput Load: 100 pF + 1TTL GateInput Pulse Levels: 0.0 to 3.0VTiming Measurement Reference Levels:Input: 1.5VOutput:

DS154317 of 17DS1543 28-PIN PACKAGE

DS15432 of 17DESCRIPTIONThe DS1543 is a full-function real-time clock/calendar (RTC) with a RTC alarm, watchdog timer, power-on reset, battery monitor

DS15433 of 17DS1543 BLOCK DIAGRAM Figure 1DS1543 OPERATING MODES Table 1VCCCE OE WEDQ0-DQ7 A0-A12 MODE POWERVIHX X HIGH-Z X DESELECT STANDBYVILXVILDI

DS15434 of 17active provided that care is taken with the data bus to avoid bus contention. If OE is low prior to WEtransitioning low, the data bus

DS15435 of 17DS1543 REGISTER MAP Table 2DATAADDRESSB7B6B5B4B3B2B1B0FUNCTION/RANGE1FFFh 10 Year YEAR YEAR 00-991FFEh X X X 10 M MONTH MONTH 01-121FFDh

DS15436 of 17SETTING THE CLOCKThe 8th bit, B7 of the control register is the write bit. Setting the write bit to a 1, like the read bit, haltsupdates

DS15437 of 17When the RTC register values match alarm register settings, the Alarm Flag bit (AF) is set to a 1. IfAlarm Flag Enable (AE) is also set

DS15438 of 17BACK-UP MODE ALARM WAVEFORMS Figure 4USING THE WATCHDOG TIMERThe watchdog timer can be used to detect an out-of-control processor. The u

DS15439 of 17ABSOLUTE MAXIMUM RATINGS*Voltage on Any Pin Relative to Ground -5.0V to +6.0VOperating Temperature 0°C to 70°CStorage Temperature -55°